The Linear Motion Blogger

Motion Control – Compact Linear Induction Motor Is Available from H2W Technologies!

October 18th, 2018

Editor

Santa Clarita, CA —– Motion Control – H2W engineers have developed a compact Linear Induction Motor (LMAA-04-01) that can generate 10.6 lbs [47 N] at a 15% duty cycle. Operating at 208 VAC 3-phase 60 Hz, the synchronous velocity of this LIM is 160 in/sec [4 m/s]. This LIM was designed for high speed operation; however, it can also be operated at stall (zero speed) to produce static thrust. This motor is encapsulated using high temperature 350°F [176°] potting compound which protects the components and seals it from moisture.

A non-contacting, high speed, linear motor measuring just 8.7 in. [223 mm] long x 3.0 in. [75 mm] wide x 1.7 in. [43 mm] high this LIM operates on the same principal as a rotary, squirrel cage, induction motor. They are typically used in applications that do not require positioning.

The 3-phase coil assembly can be directly connected to the AC line for single speed applications or to an adjustable frequency drive for variable speed control of the motor. The motors are reversible and can also be dynamically braked.

The laminated coil assembly is used in conjunction with a customer supplied aluminum and steel reaction plate to produce a force. A customer supplied bearing system is required to maintain the .125 in. [3.0 mm] air gap between the coil assembly and the reaction plate. The length of the reaction plate is typically equal to the coil assembly length plus the stroke.

Advantages:

Only 2 Parts
Wide Speed Range
No Maintenance
Non-contact
Ease of Control and Installation

Typical LIM Applications:

Conveying Systems
Baggage Handling
Personal Rapid Transport Systems
Theme Park Rides
Active linear braking systems

See Product: https://www.h2wtech.com/product/linear-induction/LMAA-04-01″

See Additional Products: https://www.h2wtech.com/category/linear-induction#specifications1

See Operating Info: https://www.h2wtech.com/category/linear-induction#operatingInfo1

See Control Options: https://www.h2wtech.com/category/linear-induction#position1

See Tutorial: http://motionshop.com/pr/H2W-Linear-Induction-Motor-Tutorial.shtml

See Youtube Video: https://www.h2wtech.com/category/linear-induction#videos1

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

Linear Motion Control – High Torque Rotary Voice Coil Actuators!

July 3rd, 2018

Editor

Linear Motion Control - H2W High Torque Voice Coil Actuators

Santa Clarita, CA —– Linear 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-015-346-2RC was designed to allow for a low moving mass (68 grams per coil) and inertia, as well as dual independent coils to allow for two independent motion profiles or couple the coils together to double the torque output. This rotary voice coil actuator can generate a continuous torque of 185 in-oz [1.29 N-m] and a peak torque of 555 in-oz [3.88 N-m] at a duty cycle of 10% (i.e. 1 second on, and 9 seconds off) in each coil on a 4 inch [102 mm] rotation arm. By coupling the coils together, the continuous torque doubles to 370 in-oz [2.58 N-m] with a peak torque of 1110 in-oz [7.75 N-m] at a 10% duty cycle.

The TWR-015-346-2RC has a total angular displacement of 15 degrees [0.26 radians] and a motor constant of 34.4 in-oz/sqrt(watt) [0.24 N-m/sqrt(watt)] per coil or when coupled together the motor constant is 48.5 in-oz/sqrt(watt) [0.34 N-m/sqrt(watt)]. The voice coil motor requires 1.33 amps of continuous current per coil and 4.0 amps of peak current per coil to generate the specified forces. The actuator fits in and envelope of 4.37 in [111.1 mm] x 2.99 in [75.9 mm] x 1.64 in [41.5 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-actuators

Technology

Simply stated, a current carrying conductor placed in a magnetic field will have a force (or torque) exerted upon it. This force is proportional to the direction and magnitude of the current and the flux density field. Since the permanent magnet flux density field is fixed, the direction of the rotation depends on the polarity of input current and the amount of torque that is produced is directly proportional to the magnitude of the input current.

Linear Motion Control - H2W High Torque Voice Coil Actuators - Drawing

A DC linear servo amplifier is required to provide power to the torquer.

Rotary voice coil actuators are supplied unhoused without bearings.

Coupling the rotary voice coil actuator to your bearing system and a rotary encoder or other feedback device yields a system that is capable of intricate angular position, velocity, and acceleration control.

Low moving inertia of the moving coil assembly allows for high angular acceleration of the payload.

Advantages:

No Torque Ripple
High Angular Acceleration
No Commutation
Zero Cogging
Brushless
Low Profile

Applications:

Aerospace

Semiconductor

Medical

Military

Rotary Voice Coil Motor – is an arc segmented multipole permanent magnet stator with a low inertia copper magnet wire rotor. Angular excursions are typically less than 90º. This torquer is supplied with out a shaft or bearing.

TWR Series Limited Angle Torque Motor

The TWR Series is comprised of a stationary, arc segmented, multipole permanent magnet stator assembly with a low inertia wound wire rotor.

Rotor: The rotor is made up of a single coil of bondable copper magnet wire. The coil is wound and preformed into the desired shape. It is held together with the bonding agents in the wire. It can be encapsulated with aluminum or plastic brackets in order to provide a means for mounting the rotor to the bearing system and payload. The maximum angular excursion is less than 90º.

Stator: The stationary stator assembly consists of multipole permanent magnets that are bonded to steel plates. The 2 opposing steel plates are spaced apart to provide a gap using end plates. The coil rotor assembly moves angularly within this gap. There is no magnetic attractive force between the stator and the rotor.

The TWR Series Torquers are available in 2 configurations.

The low profile (Type L) configuration has a smaller overall height which allows it to fit in a more compact space, but has less angular rotation for a given stator arc segment.

The second configuration (Type S) has a larger overall height but has typically twice the angular rotation per given stator arc segment when compared to the Type L torquer.

No Torque Ripple
High Angular Acceleration
No Commutation
Brushless
Low Profile

For Product Descriptions of High Torque Voice Coil Actuators CLICK HERE

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

Linear Motion Tutorial – What is a Voice Coil Actuator?

April 19th, 2018

Editor

Understanding the Basics of a Voice Coil Actuator

A voice coil actuator, also known as a non-commutated DC linear actuator, is a type of direct drive linear motor. The name “voice coil” comes from one of its historically first applications: vibrating the paper cone of a loudspeaker. They are currently used for a wide range of applications, including moving much larger masses. It consists of a permanent magnetic field assembly (permanent magnets and ferrous steel) and a coil assembly. The current flowing through the coil assembly interacts with the permanent magnetic field and generates a force vector perpendicular to the direction of the current. The force vector can be reversed by changing the polarity of current flowing through the coil.

A non-commutated DC linear actuator, typically referred to as a voice coil, is capable of a displacement of up to 5 inches, whereas most actuators have displacements up to 2 inches. Voice coils come in a range of sizes, from devices that generate a few ounces of force, to others that generate several hundred pounds of force. In addition, voice coil actuators can move bi-directionally, have a constant force over the stroke, and can be used for either open loop applications or closed loop position or force applications.

A voice coil actuator generates a force based on an interaction of current carrying conductors in a permanent magnetic field. The force generated by the voice coil is proportional to the cross product of the current flowing through the coil and the magnetic flux in the permanent magnetic field, as dictated by Lorentz’ force equation:

F = B x I

F= Force (lbs or N)
B = Flux density (Tesla)
I = Current (Amps)

The force generated is relatively constant throughout the stroke of the actuator, with minor decreases in force at the beginning and end of the stroke.

Either the coil assembly or permanent magnetic field assembly can be used as the moving member in a voice coil actuator.

Moving Coil

Voice coil actuators come in a variety of packages. The standard type, which most people are familiar with are moving coil type actuators. These typically involve a coil wound around a bobbin, which can be made from many non-magnetic materials, which moves in and out of a permanent magnetic field assembly consisting of a steel housing with a concentric permanent magnet assembly in the middle. A typical example can be found below:

Moving Magnet

Another common type of actuator would be the moving magnet design, where the coil is fixed and magnet assembly moves. This construction change would prevent moving leads during operation. The package operates similarly, but instead of an exposed coil that moves in and out of the magnet assembly, the moving magnet style utilizes a permanent magnetic field assembly “piston” moving inside a cylindrical coil tube. This style often comes with the permanent field assembly attached to a shaft, and end caps containing bearings so that this style is most commonly supplied with an integrated bearing system. A typical example can be found below:

There are variations on both common designs of either actuator design that allow for unique geometry, and the integration of voice coil actuators into several applications.

A few examples of customizations available are:

Large radial clearances so that the voice coil can be used in limited rotation applications
Designs that intentionally operate the voice coil motor in an arc (commonly referred to as a rotary voice coil actuator)
Using low outgassing materials to enable use in vacuum environments
Integration of feedback devices for closed loop control

Voice coil actuators are typically used in focusing applications, oscillatory systems, mirror tilting, and miniature position control.

Advantages of Voice Coil Actuators

Simplicity of construction
Very low hysteresis
Small size
High accelerations
No cogging or commutation

Typical Specifications for Voice Coil Actuators

Type

Stroke

Peak Force

Diameter

Power Consumption

Frequency Range

Moving Coil

0.1 to 5.2 inches

0.1 to 134 mm

0.1 to 1755 lbs

0.1 to 7020 N

0.4 to 10 inches

10 to 254 mm

1 to 2700 watts

1 to 500 Hz

Moving Magnet

0.1 to 4 inches

0.1 to 101 mm

0.1 to 419 lbs

0.1 to 1865 N

0.4 to 6.5 inches

10 to 164 mm

1 to 3400 watts

1 to 500 Hz

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 FREE, Fax: 661-251-2067, E-Mail: info@h2wtech.comor visit the website at http://www.h2wtech.com

Motion Control Stages – Precision Crossed Roller, Brushless Linear Motor Stages!

January 5th, 2018

Editor

H2W Technologies Crossed Roller-XY Stage

Santa Clarita, CA —– Motion Control Components – XY Cross Roller Positioning Stages – The XRS-19-09-XY-001 is a XY crossed roller positioning stage uses a brushless linear motor to generate a continuous/peak force of 52.4 lbs [233.1 N] (bottom axis), 52.4 lbs [233.1 N] (top axis) with a total stroke length of 19.0 in [482.6 mm] (bottom axis), 9.0 in [228.6 mm] (top axis). The top axis is able to directly mount to the moving bottom axis motor. This helps reduce the overall height and moving mass of the system. The non-contact 1-micron resolution encoder allows for precise positioning. It is guided by a rigid high accuracy crossed roller bearing.

There are also provisions that allow customer cables to be routed within the cable carrier. It has end-of-travel rubber bumper stops. A home positioning sensor, end-of-travel-sensors, and custom mounting holes on the moving table are available upon request.

The stage consists of two stacked Single Rail Positioning Stages:

Bottom Axis – XRS-019-11-050-001

Top Axis – XRS-009-10-050-001

Specification Table Axis Differentiation: Bottom Axis / Top Axis

Product Drawing
Motor P/N	n/a
Stroke	19.0 / 9.0 in	483 / 229 mm
Encoder Resolution	0.1 micron
Bearing Type	Crossed Roller
Moving Mass	14.3 / 13.0 lbs	6.5 / 5.9 kg
Total Mass	72.2 / 51.4 lbs	32.7 / 23.3 kg
Resistance @ 20C	8.0 ohms
Inductance @ 20C	10.0 mH
Electrical Time Constant	1.3 msec
Motor Constant	4.4 lbs/vwatt	19.6 N/vwatt
Force Constant	12.3 lbs/amp	54.5 N/amp
Back EMF	1.6 V/ips	63.0 V/m/sec
Force @ 100% Duty	52.4 lbs	233 N
Power @ 100% Duty	142 watts
Current @ 100% Duty	4.3 amps
Force @ 10% Duty	157 lbs	669 N
Power @ 10% Duty	1278 watts
Current @ 10% Duty	12.9 amps
Stage Length	35.0 / 23.0 in	889 / 584 mm
Stage Width	10.7 / 9.9 in	273 / 253 mm
Stage Height	3.1 in	77.5 mm

For short stroke, compact positioning stages please see our Voice Coil Positioning Stages.

To determine your motion profile needs, use our Linear Motion Calculator.

YouTube Video

https://youtu.be/-SGIMuaE4ws

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

Linear Motion Control – 1.0 Micron Voice Coil Positioning Stage from H2W!

December 7th, 2017

Editor

H2W Technologies Voice Coil Positioning Stage

Santa Clarita, CA —– Linear Motion Control – The VCS05-060-AB-01-MC voice coil positioning stage uses H2W voice coil motor NCC05-18-060-2X to generate a continuous/peak force of 6.0 lbs [26.7 N]/18.0 lbs [80.1 N] with a total stroke length of 0.50 in [12.1mm]. The 1.0-micron resolution encoder allows for precise positioning. It comes supplied with a non-contact air bearing (air bushing) which allows for frictionless motion. The motor coil is the moving part of the assembly in order to reduce the moving mass of the system. Power is supplied to the motor via a high flex, high reliability flat ribbon cable.

Product Drawing
Motor P/N	NCC05-18-060-2X
Stroke	0.50 in	12.7 mm
Encoder Resolution	1.0 micron
Bearing Type	Air Bushing
Moving Mass	20.0 oz	568 grams
Total Mass	64.0 oz	1800 grams
Resistance @ 20C	11.5 ohms
Inductance @ 20C	4.5 mH
Electrical Time Constant	0.39 msec
Motor Constant	1.8 lbs/vwatt	7.9 N/vwatt
Force Constant	6.3 lbs/amp	27.8 N/amp
Back EMF	0.70 V/ips	27.8 V/m/sec
Force @ 100% Duty	6.0 lbs	26.7 N
Power @ 100% Duty	12.0 watts
Current @ 100% Duty	1.0 amps
Force @ 10% Duty	18.0 lbs	80.1 N
Power @ 10% Duty	102 watts
Current @ 10% Duty	3.0 amps
Encoder Type	Magnetic
Moving Part	Coil Assembly

For long stroke, compact size positioning stages please see our Single Rail Positioning Stages

To determine your motion profile needs, use our linear motion calculator

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