Category Archives: Motors

Motion Control – Miniature 5/8 of an Inch Diameter Voice Coil Motor with Built-in Shaft Has High Speed, High Acceleration, and High Force to Size Ratio!

Motion Control – Miniature Voice Coil Motor

motion control - voice coil actuator


motion control - moticont

Van Nuys, CA — Motion Control – Moticont’s GVCM-016-010-01 Miniature Linear Voice Coil Motor (Linear DC Motor) has a high force to size ratio with 5.0 oz (1.4) continuous force and 15.7 oz (4.4 N) of peak force with a housing measuring just 0.625 in. (15.9 mm) dia. by 0.375 in. (9.5 mm) long. This motor features high acceleration/deceleration, high speed, high reliability, zero backlash and a 0.125 inch (3.2 mm) stroke length. This very small brushless servo motor is an ideal low cost replacement for pneumatic linear actuators.

Also called an Electric Cylinder, this linear actuator has a threaded 2-56 UNC-2A shaft for a backlash free connection. The housing and coil each have 2 2-56-UNC-2B threaded mounting holes on 0.25 in (6.35 mm) centers. The built in centered shaft facilitates the commissioning of the motor for easy integration into current and future applications.

This clean, quiet, efficient, low inertia, high reliability actuator is ideal for: Heptic feedback and pipetting in medical devices, switch activation, testing, sorting, assembly equipment, work holding and clamping, scanners and laser beam steering and filtering, laser, machining and drilling, optical focusing, and dynamic vibration absorption. Moticont also offers DC and servo motor drivers.

Is there a need for a higher force or longer stroke? There are currently 7 series of Moticont GVCM motors based on diameter of this motor.

To find the right motor for you application go to: http://moticont.com/linear-motor-with-bearing.htm

 

About Moticont – Moticont is a manufacturer of motion control products. Their product line includes voice coil motors, three phase brushless motors and positioning stages and slides.

Moticont is committed to exceeding their customers’ quality expectations and industry standards throughout the design, manufacturing, service and technical support phases. Their modern manufacturing facility, highly controlled processes, committed staff, and extensive testing complement their product design strengths. This enables them to supply their clients with specialized small orders to high volume just-in-time deliveries.

They offer an extensive line of standard products ready to be shipped immediately from stock, and when standard products are not quite right for an application, highly trained design engineers are always available to develop custom motion control products to fit the specific needs or our customers.

For additional information contact Sales Team at Moticont, 6901 Woodley Ave, Van Nuys, CA 91406; Toll Free: +1 (888) 785-1804, Tel: +1 (818) 785-1800, moticont@moticont.comor visit the website at http://www.moticont.com


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Motion Control – Maxon’s trade show experience goes virtual!

Motion Control – Virtual Trade Show!

motion control - trade show

 

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Taunton, MA — Motion Control Products – This year, the COVID-19 pandemic has led to the cancellation of nearly all trade shows. Despite this, maxon is offering a digital trade show experience to all of its customers and anyone who’s interested in learning about the latest in drive technology. Visitors to maxon’s virtual booth will discover the benefits of our latest products such as the MiniMACS6 master controller, learn about high torque brushless DC motors as well as flat motors for robotics, and get to know the Mars rover. Visit virtualbooth.maxongroup.com and contact us to get your ideas moving.

If you prefer watching an entertaining video introducing all the latest products maxon brought to the market this year, you will find it here: https://youtu.be/Jtw7Hwxbdr4 Have fun watching! For more information please contact us at info.us@maxongroup.com or 508-677-0520.

About Maxon

The Swiss specialist for quality drives maxon is a developer and manufacturer of brushed and brushless DC motors, as well as gearheads, encoders, controllers, and entire mechatronic systems. maxon drives are used wherever the requirements are particularly high: in NASA’s Mars rovers, in surgical power tools, in humanoid robots, and in precision industrial applications, for example. To maintain its leadership in this demanding market, the company invests a considerable share of its annual revenue in research and development. Worldwide, maxon has more than 3000 employees at nine production sites and is represented by sales companies in more than 30 countries.

Maxon is a developer and manufacturer of brushed and brushless DC motors, as well as gearheads, encoders, controllers, and entire mechatronic systems. With over 50 years of experience in drive technology, maxon works closely with engineers designing high-tech innovations. maxon drives are used wherever the requirements are particularly high: in NASA’s Mars rovers, in surgical power tools, in humanoid robots, and in precision industrial applications. Worldwide, maxon has more than 2800 employees at nine production sites and is represented by sales companies in more than 30 countries. www.maxongroup.com

Contact maxon for more details https://support.maxongroup.com/hc/en-us/requests/new

Comprehensive documentation and software are included with every delivery, and are also available for you to download from our website at www.maxonmotor.com.

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Motion Control – Hollow Core Voice Coil Motor Has Low Inertia, High Precision available from Moticont!

Motion Control – Hollow Core Voice Coil Motor!

 

motion control - hollow core voice coil actuator

 


The HVCM-051-025-013-01 Linear actuator has a hollow core that allows for optics, illumination, laser beams, or cables to pass through, additionally, it has a continuous force rating of 5.3 lbs (23.7 N) and a peak force of 16.9 lbs (74.8 N) at a 10% duty cycle. This compact voice coil actuator measuring just 2.000 in. (50.8 mm) dia. X 1.00 in. (25.4 mm) housing length with a 0.50 in. (12.7 mm) stroke is ideal for applications such as: Medical diagnostics and testing, laser beam steering, wafer handling, laser cutting and welding, dynamic vibration absorption, optical focusing, scanning, assembly, and positioning applications.Van Nuys, CA — Motion Control – Moticont introduces an open aperture (hollow core) voice coil or moving coil linear motor from Moticont, the HVCM-051-025-013-01. Featuring an open aperture of 0.50 in. (12.7 mm) this low cost, clean room friendly non-commutated motor is available off-the-shelf. The light weight and low inertia moving coil of the linear actuator demonstrates: High acceleration/deceleration, high speed, zero cogging, and by connecting directly to the load, zero backlash.

Two 10-32 UNF-2B x 0.25 in. (6.4 mm) deep threaded mounting holes on 1.000 in. (25.4 mm) centers in the housing and coil allows for flexible and easy integration into new and existing applications. When used in closed loop applications with an adequate optional position sensor, resolutions of less then 1 micron are achievable for millions of cycles. If a longer stroke, higher force, a smaller foot print, or customized mounting is required, consult Moticont’s team of engineers. All of Moticont’s voice coil linear actuators are available as complete plug-and-play systems, including: Position sensor, servo driver, power supply, and if required with a linear position sensor.

About Moticont – Moticont is a manufacturer of motion control products. Their product line includes voice coil motors, three phase brushless motors and positioning stages and slides.

Moticont is committed to exceeding their customers’ quality expectations and industry standards throughout the design, manufacturing, service and technical support phases. Their modern manufacturing facility, highly controlled processes, committed staff, and extensive testing complement their product design strengths. This enables them to supply their clients with specialized small orders to high volume just-in-time deliveries.

They offer an extensive line of standard products ready to be shipped immediately from stock, and when standard products are not quite right for an application, highly trained design engineers are always available to develop custom motion control products to fit the specific needs or our customers.

For additional information contact Sales Team at Moticont, 6901 Woodley Ave, Van Nuys, CA 91406; Toll Free: +1 (888) 785-1804, Tel: +1 (818) 785-1800, moticont@moticont.comor visit the website at http://www.moticont.com


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Motion Control – Long Travel and High Torque Rotary Voice Coil Actuators from H2W Technologies!

Motion Control – High Torque Rotary Voice Coil Actuators

motion control - Rotary Voice Coil Torque Motor


motion control - h2w logoThe Voice coil motor requires 1.7 amps of continuous current per coil and 5.1 amps of peak current per coil to generate the specified forces.  The actuator fits in and envelope of 10.26 in [260.5 mm] x 3.01 in[76.4 mm] x 3.39 in [86 mm].  The moving coil design ensures a hysteresis free movement as the coil is wet wound and self-supported, and the non-commutated coil allows for ripple-free motion and no cogging.  The voice coil actuator has been designed with mounting provisions in the magnet and coil assemblies.  This allows for the integration of a bearing system to maintain the clearances between the coil and permanent magnetic field assemblies. The rotary voice coil actuator is ideal for applications requiring high torque and high- speed applications. Examples of such applications are driving a gimbal axis in scanning applications as well as providing stabilizing torques for image stabilization. More examples of H2W’s Rotary Voice Coils are available on our website: https://www.h2wtech.com/category/rotary-voicecoil-actuatorsSanta Clarita, CA — Motion Control – H2W Technologies has developed several high torque rotary voice coil actuators, otherwise known as a limited angle torque motors or LATs. The model TWR-034-800-1RC was designed to allow for a relatively low moving mass and inertia, as well as a long rotary stroke of 34 degrees [0.59 radians] on a 11.4” [290 mm] arm, which equates to a travel of 6.75 inches [171.5 mm] which is long travel for this style of actuator, which typically restrained to an equivalent linear travel of 2 inches [50.8 mm]. This rotary voice coil actuator can generate a continuous torque of 1400 in-oz [9.8 N-m] and a peak torque of 4200 in-oz [29 N-m] at a duty cycle of 10% (i.e. 1 second on, and 9 seconds off) in each coil on a 11.4 inch [290 mm] rotation arm.  The TWR-034-800-1RC has a total angular displacement of  34 degrees [0.59 radians] and a motor constant of 275 in-oz/sqrt(watt) [1.92 N-m/sqrt(watt)].

About H2W Technologies, Inc.

H2W Technologies, Inc. is dedicated to the design and manufacture of linear and rotary motion products that are used in the motion control industry. The complete line of linear electric motors includes: Single and dual axis linear steppers, DC brush and brushless linear motors, voice coil actuators, and AC induction motors. Also offered is a complete line of ball screw, lead screw and belt driven positioning stages.

Other motion control products include: Limited angle torque motors for compact, limited angular excursion rotary servo applications, 3 phase brushless rotary servo motors with matching digital servo amplifiers and permanent magnet linear brakes for fail-safe, zero power braking for baggage handling and people moving applications as well as amusement park rides.

With over 75 years combined experience in the linear and rotary motion field, the H2W Technologies team of engineers offers the optimal solution to the most demanding motion control, requirements.

For additional information contact Mark Wilson at H2W Technologies, 26380 Ferry Ct, Santa Clarita, CA 91350; Tel: 888-702-0540, Fax: 661-251-2067, E-Mail: info@h2wtech.com or visit the website at http://www.h2wtech.com


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Motion Control – Maxon drives are heading to the Red Planet with NASA’s Perseverance Rover!

Motion Control – Application – Maxon drives heading to the Red Planet!

In July, NASA will be sending its fifth rover to Mars. Its main mission is to collect soil samples that will be analyzed on Earth at a later time. The rover will also carry a helicopter that will perform the first flights on the Red Planet. maxon’s precision DC and BLDC motors will be used for numerous mission-critical tasks.

motion control - maxon motors

 


motion control - maxon motorTaunton, MA — Motion Control Products & Application – maxon drive systems are very familiar with Mars. Our drives have been used in virtually every successful robotic mission over the last three decades. There are now more than 100 of them on the Red Planet and there are likely to be more soon. The launch window for NASA’s next mission opens on July 22nd. An Atlas V rocket will launch the new Perseverance rover on its way to Mars, where it will be searching for signs of previous life on the planet. Its most important job is to take multiple soil samples, seal them in containers and deposit them on the surface of Mars so that a future mission can return them to Earth. Several maxon motors will be used to handle the samples inside the rover. For example, maxon DC motors are installed in the robotic arm, which moves the samples from station to station. Maxon motors will also be used for sealing and depositing the sample containers.

NASA’s Jet Propulsion Laboratory (JPL), is carrying out the mission, and have asked maxon to produce 10 drives for the rover. As with almost all previous Mars missions, these drives are based on standard products from maxon’s catalog with modifications. For the first time, NASA is using brushless DC motors, including: nine EC 32 flat and one EC 20 flat in combination with a GP 22 UP planetary gearhead. Working closely with JPL specialists, maxon engineers developed the drives over several years and tested them thoroughly to achieve the highest standards of quality. “We’ve learned a lot from this exciting project,” says Robin Phillips, head of the maxon SpaceLab. “We now have very broad expertise in space applications and have established quality assurance processes that meet the expectations of the industry. Customers from other industries such as the medical sector, where requirements are often similar, can also benefit from this know-how.”  Space missions place the highest demands on drive systems. This includes vibrations during the rocket launch, vacuum during the journey, impacts on landing, and the harsh conditions on the surface of Mars, where temperatures fluctuate between -125 and +20 degrees Celsius and dust penetrates everywhere

Maxon DC motors control the Mars helicopter.

motion control - maxon mars motor

The Perseverance rover is expected to land on Mars on February 18, 2021 – but it won’t be alone. A drone helicopter called Ingenuity will be attached to the underside of the rover. It weighs 1.8 kilograms, is solar powered and will perform several short flights, as well as take aerial images. The main goal of this experiment is to test the concept for further drones of this kind. maxon has six brushed DCX motors with a diameter of 10 millimeters controlling the tilt of the rotor blades and the direction of flight. The drives are very light, dynamic and highly energy-efficient. These properties are crucial, because every gram counts on the Mars helicopter. Flying on Mars is not easy. The atmosphere is extremely thin, roughly comparable to the conditions on Earth at an altitude of 30 kilometers. The drone helicopter has flown in a simulated test environment in the JPL laboratory. Whether it will lift off on Mars remains to be seen. First, other obstacles, such as the rocket launch, must be successful. “We hope that everything goes well and that we’ll soon see our drives in action on Mars,” says maxon CEO Eugen Elmiger. “We’re all keeping our fingers crossed.”

motion control -maxon miniature motors

For additional information, please contact us at info.us@maxongroup.com or 508-677-0520.

About Maxon

maxon is a developer and manufacturer of brushed and brushless DC motors, as well as gearheads, encoders, controllers, and entire mechatronic systems. With over 50 years of experience in drive technology, maxon works closely with engineers designing high-tech innovations. maxon drives are used wherever the requirements are particularly high: in NASA’s Mars rovers, in surgical power tools, in humanoid robots, and in precision industrial applications. Worldwide, maxon has more than 2800 employees at nine production sites and is represented by sales companies in more than 30 countries. www.maxongroup.com/maxon/view/content/index

Contact maxon for more details https://support.maxongroup.com/hc/en-us/requests/new

Comprehensive documentation and software are included with every delivery, and are also available for you to download from our website at www.maxonmotor.com.

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Motion Control – New from MAXON, Miniaturized Controller the EPOS4 Micro 24/5 CAN!

Motion Control – Miniaturized Controller

motion control micro controller

 

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Taunton, MA — Motion Control Products – Maxon is launching a new, miniaturized controller with a size of only 32 mm x 22 mm as part of its successful line of positioning controllers. The attractive price-performance ratio, with a functionality that’s virtually identical to the larger units, addresses cost-sensitive single- and multi-axis applications.

The functionality, operation, software, and accessories of the new controller are derived almost directly from the existing products in the EPOS4 range. The device is suitable for use with both brushed DC and brushless EC motors (BLDC) of up to 120 W and has comprehensive feedback options such as Hall sensors, as well as digital incremental and SSI absolute encoders. State-of-the art concepts such as Dual Loop, Field Oriented Control (FOC), feed forward, and observer control allow optimal control in a wide variety of applications.

The existing digital and analog inputs and outputs are freely configurable and ideally matched to the numerous functions and operating modes of the CiA-402 positioning controller. The intuitive EPOS Studio start-up software, as well as libraries and programming examples for integration in a wide variety of master systems, are available free of charge and make operation as easy as possible. A plug-and-play EvaluationBoard (EB) is provided for initial commissioning. The offer is rounded out by a comprehensive scope of accessories and detailed product documentation.

The first derivative of this new micro design is the CANopen version, which can also be addressed via RS232 or USB, as usual. In spring 2020, the EPOS4 Micro 24/5 EtherCAT will follow as a second product of similarly small size.

Visit epos.maxongroup.us for the latest updates about EPOS and individual devices, EPOS Studio, as well as all downloads and technical documentation.

About Maxon

maxon is a developer and manufacturer of brushed and brushless DC motors, as well as gearheads, encoders, controllers, and entire mechatronic systems. With over 50 years of experience in drive technology, maxon works closely with engineers designing high-tech innovations. maxon drives are used wherever the requirements are particularly high: in NASA’s Mars rovers, in surgical power tools, in humanoid robots, and in precision industrial applications. Worldwide, maxon has more than 2800 employees at nine production sites and is represented by sales companies in more than 30 countries. www.maxongroup.com

Contact maxon for more details https://support.maxongroup.com/hc/en-us/requests/new

Comprehensive documentation and software are included with every delivery, and are also available for you to download from our website at www.maxonmotor.com.

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Direct Drive Linear Motor Has Integrated Encoder and Temperature Sensor for Increased Throughput!

Motion Control – Linear Actuator Gives Higher Throughput! 

motion control Voice coil motor with temperature sensor

 

MotiCont-Logo

Van Nuys, CA – Motion Control Products – The new patented SDLM-019-070-01-01 direct drive linear motor with integrated position and temperature sensors is the latest addition to the series of zero backlash, zero cogging, high acceleration, high speed, high resolution, long life motors from Moticont. Also known as an electric cylinder, this compact direct drive linear motor is just 0.75 in. (19.1 mm) in diameter and 2.75 in (69.9 mm) long.  Protected inside the motor housing, the linear optical quadrature encoder is directly connected to the shaft for the greatest possible accuracy. Highest throughputs are achieved by the SDLM-019-070-01-01 linear motor when operating at peak efficiency monitoring the data from the internal temperature sensor.

The SDLM-019-070-01-01 direct drive linear motor has a stroke length of 0.500 in. (12.7 mm) and a continuous force rating of 7.3 oz. (2.0 N) and peak force of 23.0 oz (6.4 N).  This non-commutated direct drive servo motor features: Quiet long life, plain linear bearings, an integrated internal 1.25 micron resolution (0.000049 in.) quadrature optical encoder with differential outputs, and a non-rotating shaft.  Applications include: Manufacturing (assembly and inspection equipment), sorting and packaging, semiconductor handling, medical procedure tables and instruments, antenna positioning, dampers, door & valve actuators, agricultural equipment, shaking, and adjustable office furniture.

Direct coupling of the load or stage to the low inertia non-rotating shaft eliminates backlash and allows for high acceleration/deceleration.  Both ends of the actuator and shaft ends have threaded mounting holes for easy integration into new and existing applications. The SDLM-019-070-01-01 Direct Drive Linear Actuator is also available with a matching servo controller

About Moticont – About Moticont – Moticont is a manufacturer of motion control products. Their product line includes voice coil motors, three phase brushless motors and positioning stages and slides.

Moticont is committed to exceeding their customers’ quality expectations and industry standards throughout the design, manufacturing, service and technical support phases. Their modern manufacturing facility, highly controlled processes, committed staff, and extensive testing complement their product design strengths. This enables them to supply their clients with specialized small orders to high volume just-in-time deliveries.

They offer an extensive line of standard products ready to be shipped immediately from stock, and when standard products are not quite right for an application, highly trained design engineers are always available to develop custom motion control products to fit the specific needs or our customers.

For additional information contact Sales Team at Moticont, 6901 Woodley Ave, Van Nuys, CA 91406; Toll Free: +1 (888) 785-1804, Tel: +1 (818) 785-1800, moticont@moticont.comor visit the website at http://www.moticont.com


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Motion Control – Check out the new integrated powerful brushless motor and a positioning controller available from Maxon!

Motion Control – Integrated Brushless Motor Controller!

 

motion control - Maxon

motion control integrated motor / controllerEven Stronger, Even Smaller

Fall River, MA — Motion Control – See the new modular compact drive that was developed especially for applications in industrial and logistics automation. The IDX drive combines a powerful, brushless EC-i motor and an EPOS4 positioning controller, which can be complemented with a maxon planetary gearhead when required. This drive stands out for its high efficiency, maintenance-free components, and a high-quality industrial housing with IP65 protection. It also features configurable digital and analog inputs and outputs, and intuitive software enabling easy commissioning and integration into master systems.

A solution for confined spaces

Speaking of positioning controllers: The maxon EPOS4 is now also available in a Micro version. As the name suggests, the benefits of these motion controllers are their small size and attractive pricing. The EPOS4 Micro 24/5 is suitable for robotic applications where space is at a premium, and cost-sensitive multi-axis applications.

Contact maxon for more details info@maxonmotorusa.com

Comprehensive documentation and software are included with every delivery, and are also available for you to download from our website at www.maxonmotor.com.

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Motion Control Tutorial – Slotted vs. Slotless Motor Technology

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Motion Control – Tutorial Motor Technology

Motion Control Tutorial – When first introduced, brushless DC motors, despite their many advantages, were cast as a costly alternative to brush-commutated motors and were typically only specified for low-power applications where long life was the primary desired requirement. Without the mechanical brush-commutator mechanism that would wear and eventually result in motor failure, brushless motors could be relied upon to deliver performance over time. As for other advantages, conventional wisdom held that brushless motors provide high speed and fast acceleration, generate less audible noise and electromagnetic interference, and require low maintenance. Brush-commutated motors, on the other hand, would afford smooth operation and greater economy. In the past decade, though, brushless motors have gained broader appeal and greater acceptance in industry for a wider range of applications previously dominated by brush-commutated products, due in part to dramatic reductions in the cost and size of electronic components and advances in motor design and manufacturing.

motion control Tutorial

At the same time, manufacturers have further sought to challenge conventional wisdom by improving brushless motor design in an effort to combine the traditional advantages of brush-commutated and brushless types. A noteworthy example of how far these innovations have progressed involves the slotless (instead of slotted) construction of the brushless motor’s stationary member, or stator.

The slotless stator design originated with the goal to deliver smooth running performance and eliminate cogging, which is an unwanted characteristic especially in slower-running applications (less than 500 rpm). The absence of cogging is, in fact, the most-often cited reason for selecting a slotless brushless motor.

Slotted Motor Construction

Most brushless motors (slotted or slotless) use electronic commutation, usually Hall-effect sensors and magnets, in place of brushes. The motor’s rotor consists of a steel shaft with permanent magnets or a magnetic ring fixed around the circumference of the shaft. The magnets are responsible for producing torque. As the flux density of the magnet material increases, the amount of torque available from the rotor assembly increases.

In traditional slotted brushless motors, the stator features a group of slotted steel laminations (0.004 in. to 0.025 in. thick), which are fused to form a solid uniform stack and create a series of teeth. Wound copper coils, which produce electromagnetic fields, are then inserted into each of the slots. Together, the laminated stack and wound copper coil form the stator assembly. The return path completing the magnetic circuit consists of the laminated material outboard of the copper windings in the stator and the motor housing.

These brushless slotted motors are especially powerful, because the teeth around which the copper wire is wound place the iron closer to the magnets, so the magnetic circuit is completed more efficiently. As the air gap between iron and magnets is reduced, the torque available for the motor is increased.

However, slotted stators are known to cause cogging, which is attributed to the teeth in their construction. Cogging occurs when the permanent magnets on the rotor seek a preferred alignment with the slots of the stator. Winding copper wires through the slots tends to increase this effect. As magnets pass by the teeth, they have a greater attraction to the iron at the ends of the teeth than to the air gaps between them. This uneven magnetic pull causes the cogging, which ultimately contributes to torque ripple, efficiency loss, motor vibration, and noise, as well as preventing smooth motor operation at slow speeds. A slotless stator offered a solution to the problems experienced with cogging in slotted brushless DC motors.

Advantage of the BLDC Slotted Motor Technology

The main advantages of the slotted technology are:

  • ease of winding customization
  • increased heat dissipation
  • ability to withstand high peak torque
  • high power density

Slotted Motor Applications

The Slotted Motor is ideal for applications such as:

  • Medical Hand Tools
  • Hand held shaver system for arthroscopic surgeries
  • High speed surgical drills for ENT surgeries

Slotless Motor Construction

Instead of winding copper wires through slots in a laminated steel stack as in conventional slotted brushless motors, slotless motor wires are wound into a cylindrical shape and are encapsulated in a hightemperature epoxy resin to maintain their orientation with respect to the stator laminations and housing assembly. This configuration, which replaces the stator teeth, eliminates cogging altogether and results in desired quiet operation and smooth performance.

The slotless design also reduces damping losses related to eddy currents. These currents are weaker in a slotless motor, because the distance between the laminated iron and magnets is greater than in a slotted motor.

Slotless motors are typically designed with sinusoidal torque output that produces negligible distortion, rather then a trapezoidal voltage output. The sinusoidal output reduces torque ripple, especially when used with a sinusoidal driver. Because the slotless design has no stator teeth to interact with the permanent magnets, the motor does not generate detent torque. In addition, low magnetic saturation allows the motor to operate at several times its rated power for short intervals without perceptible torque roll-off at higher power levels.

Compared with slotted motors, slotless construction also can significantly reduce inductance to improve current bandwidth. The teeth in a slotted motor naturally cause more inductance: the coils of copper wire around the teeth interact with the iron in a slotted motor, and this interaction tends to send the current back on itself, resulting in more damping (or dragging) and impacting negatively on slotted motor response and acceleration.

In terms of delivering power, conventional slotted motors used to enjoy the advantage over slotless types, due (as noted) to the proximity of iron and magnets and the reduced air gap.

However, this advantage has virtually evaporated, in large part due to the utilization of high-energy, rare-earch magnets (such as samarium cobalt and neodymium iron boron). By incorporating these magnets, manufacturers of slotless brushless motors have been able to routinely compensate for the greater air-gap distance. These more powerful magnets effectively enable the same (or better) torque performance for slotless products compared with slotted. Eliminating the teeth and using stronger magnets both serve to maximize the strength of the electromagnetic field for optimum power output. Rare-earth magnets, along with the fact that fewer coils, or “turns,” of the wire are required in slotless motors, also help contribute to low electrical resistance, low winding inductance, low static friction, and high thermal efficiency in slotless motor types.

One more important difference between slotless and slotted designs is the rotor diameter. Slotless motors have a larger rotor diameter than slotted construction for the same outside motor diameter and will generate a higher inertia, as well as accommodating more magnet material for greater torque. For applications with high-inertia loads, the slotless product is more likely to be specified.

Slotless Motor Applications

In general, brushless motors are usually selected over brushcommutated motors for their extended motor life. (While motor life is application-specific, 10,000 hours are usually specified.) Other reasons for specifying brushless motors include a wide speed range, higher continuous torque capability, faster acceleration, and low maintenance.

In particular, slotless versions of brushless DC motors will suit those applications that require precise positioning and smooth operation. Typical niches for these motors include computer peripherals, mass storage systems, test and measurement equipment, and medical and clean-room equipment.

As examples, designers of medical equipment can utilize slotless motors for precise control in machines that meter and pump fluids into delicate areas, such as eyes. In medical imaging equipment, slotless brushless DC motors decrease banding by providing the smoother operation at low speeds. Airplane controls supply smoother feedback to pilots. And, by eliminating cogging and resulting vibration, these motors can reduce ergonomic problems associated with hand-held production tools. Other appropriate applications include scanners, robots for library data storage, laser beam reflector rotation and radar antenna rotation equipment, among many others./span)

Customization Options

Slotless brushless DC motors, as with most motors today, feature a modular design so they can be customized to meet specific performance requirements. As examples, planetary or spur gearheads can be integrated on motors for an application’s specific torque and cost requirements. Planetary gearheads offer a higher-torque alternative. Slotless motors can further be customized with optical encoders, which provide accurate position, velocity, and direction feedback that greatly enhances motor control and allows the motors to be utilized in a wider range of applications. As a low-cost alternative to optical encoders, rotor position indicators (ie. Hall Sensors) can be specified.

When using optical encoders, differential line drivers can be utilized to eliminate the effects of electrically noisy environments. Differential line drivers are designed to ensure uncorrupted position feedback from the encoder to the control circuit.

Motor Selection Guided by Application

Despite the overall design and performance comparisons reviewed here for slotless and slotted brushless DC motor types, one should remain cautious in drawing any conclusion that one type is the ultimate choice over the other. There are simply too many variables that must be evaluated, ranging from rotor size and windings to housing and special components. A given application and its requirements should (and will) be the guiding factors in selecting a particular motor type and the customized components to be incorporated.

Some encouraging news in those applications that would clearly benefit from a slotless brushless motor is that costs are coming down to be more in line with those for slotted motors. This is because of new streamlined manufacturing techniques and an increasingly available supply of powerful magnets, which are both beginning to have a positive impact on end-product costs.

Regardless of any cost differential, however, for many applications, slotless brushless DC motors will be the preferred choice to resolve specific requirement issues. While advances in electronics are beginning to be applied that promise to reduce normal cogging in slotted products as a step toward making these motors more smooth running and quiet, the industry is not there yet: slotless motors remain the best alternative where cogging and life are defining performance issues

This Tutorial and other Motion Control Tutorials are available through www.Servo2Go.com

For further information on this new product or others in our extensive product portfolio, call 1- 877-378-0240 or e-mail Warren Osak at warren@servo2go.comor visit Servo2Go.com at: www.Servo2Go.com

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Motion Control Components Application Exoskeleton! – Maxon Driven – Focus – 2020 Cybathlon!

Motion Control – Application Exoskeleton

“People with disabilities are only disabled if they come up against the insurmountable. But where do the obstacles in our everyday lives come from? From barriers in our minds” … Cybathlon founder Robert Riener.

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Taunton, MA — Motion Control Components Application – maxon’s DRIVEN magazine just released a special issue focusing on the 2020 CYBATHLON to be held in Zurich on September 19th and 20th.This is an event where people with physical disabilities compete against each other in obstacle courses with the use of assistance systems such as exoskeletons, bionics prostheses and motorized wheelchairs.

CYBATHLON is so much more than a competition, it is intended to serve as a platform between technology developers, people with disabilities and the public. It’s bringing everyone together under one roof to see where the challenges are and to work towards developing technologies that make everyday life easier for those with physical disabilities.

We, at maxon, are very excited to be a part of this special event. Our drives are perfectly suited for these application – they are precise, compact and extremely efficient. We look forward to seeing all the latest developments and working with the developers on the next generation of assistance systems.

Enjoy this latest issue and if you see a story you’d like to share with your readers, I’d welcome the opportunity to discuss this with you.

About Maxon

maxon is a developer and manufacturer of brushed and brushless DC motors, as well as gearheads, encoders, controllers, and entire mechatronic systems. With over 50 years of experience in drive technology, maxon works closely with engineers designing high-tech innovations. maxon drives are used wherever the requirements are particularly high: in NASA’s Mars rovers, in surgical power tools, in humanoid robots, and in precision industrial applications. Worldwide, maxon has more than 2800 employees at nine production sites and is represented by sales companies in more than 30 countries. www.maxongroup.com

Contact maxon for more details https://support.maxongroup.com/hc/en-us/requests/new

Comprehensive documentation and software are included with every delivery, and are also available for you to download from our website at www.maxonmotor.com.

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See this and other Motion Control Components from Maxon featured on:

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