The Linear Motion Blogger

Dual Head Voice Coil Positioning Stages feature: High Speed, Parallelism, and 0.1 Micron Resolution!

Editor — Fri, 18 May 2012 13:28:40 +0000

Santa Clarita, CA — Dual Head Voice Coil Stages mounted on one set of precision parallel shafts, features high speed, high acceleration/deceleration, and 0.1 to 1.0 micron resolution. The VCS15-050-AB-LV-2 dual head voice coil positioning system (photo supplied), is a precision, two axis air bearing positioning system. Each linear voice coil motor has a 1.5 in. [38.1 mm] stroke, generates 8.4 lbs [37.4 N] of continuous force and 25.2 lbs [112 N] of peak force and is guided by two porous carbon air bushings floating on two precision parallel shafts. The dual head voice coil positioning systems, which can be operated synchronously, or independently, are designed for high end applications such as: Semiconductor testing and assembly, scanning, inspection and test, laser micromachining, applications in research laboratories, and in manufacturing, medical, and defense industries.

The dual head/air bearing voice coil positioning systems are supplied with two non-contact analog output LVDTs (Linear Variable Displacement Transducers), however digital output linear encoders are available as an option. Dual head/air bearing positioning systems are available with stroke lengths from .25 in. [6 mm] to 2 in. [ 50 mm], and from 0.5 lbs [2.2 N] to 35 lbs [155 N] of continuous force and from 1.5 lbs [6.6 N] to 105 lbs [465 N] of peak force.

Mounting holes in the base and stages allow for easy installation in new or existing applications. Custom single and dual head Voice Coil stages from H2W Technologies are available as complete plug-and-play positioning systems. Completely custom systems can be shipped in 4 to 6 weeks from receipt of order.

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, 26470 Ruether Avenue #102, 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 – DC Linear Brush Motors

Editor — Fri, 23 Mar 2012 16:46:11 +0000

Linear Motion – DC Linear Brush Motors from H2W Technologies

Product Info:
Travel – 1 to 120 inches [0.025 to 3 m]
Velocity – 1 to 100 inches/sec [0.025 to 2.5 m/s]
Acceleration - 0.1 to 12 G’s 0.1 to 12 G’s
Peak Force - 12 to 207 lbs [53 to 920 N]
Continuous Force - 4 to 69 lbs [19 to 267 N]

The DC brush linear motor is ideal for long stroke, open or closed loop servo, linear motion applications. They can be used at speeds up to 100 in / sec [2.5 m / sec] and as low as 1 in/sec [25 mm / sec]. They are capable of very precise position, velocity and acceleration control when coupled with a linear encoder.

The motor is commutated using brushes on the moving permanent magnet secondary in conjunction with a stationary commutator bar on the coil assembly. This results in only the coils directly beneath the secondary with current flowing in them.

The short moving brush assembly is magnetically attracted to the long stationary laminated coil assembly. A customer supplied bearing system is required to guide the moving secondary and to maintain a .025” [0.63 mm] gap between the secondary and the coil assembly.

The power to the motor (from a customer supplied PWM DC servo amplifier) is supplied to the moving secondary via a power cable. The resultant force is proportional to the input current.

The low overall height (1.65” [41.9 mm]) of the brush motor allows it to fit into a very compact space The low moving mass of the secondary allows for higher accelerations of light payloads.

The motor comes in different widths and secondary lengths to meet different force and packaging requirements.

Advantages:
Low profile and small cross section
Available in many different widths and lengths
High Acceleration of light loads
High Speed
Uses low cost PWM amplifier

Applications:
Pick and Place Machines
Coordinate measuring machines
Parts transfer
Inspection Machines

The Linear Brush Motor consists of 2 main parts
Long Stationary Coil Assembly: The laminated motor stacks are insulated and bonded together. The copper coils are inserted into insulated slots in the stack. The ends of the coils are brought out and soldered to the commutator bar. An aluminum mounting angle and a mounting bar are bolted to each side of the lamination stack. Threaded mounting holes in the angle or “T” nuts are available to mount the coil assembly to the customer supplied base plate. The coil assembly is available in widths from 2.0″ to 5.0 ” [50 mm to 125 mm]. The length of the coil assembly is a function of the stroke. Single piece motors are available as long as 144 inches [3.6 m]. Longer motors will be made in sections.

Short Moving Secondary Assembly: The secondary is made of nickel plated steel with permanent magnets bonded to bottom. A PCB with brushholders and brushes soldered on, is mechanically attached to the side of the secondary. Mounting holes are provided for attaching the secondary to the moving member of the customer supplied table assembly. The secondary comes in different widths and lengths, depending on the required force. Multiple secondaries can be supplied with a single coil assembly to allow for independent moving heads or they can be coupled together to produce larger forces. The standard lengths for the secondaries are 4.38″ for BRA motors and 9.56″ for BRB motors.

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.

Linear Motion – Two Axis “Voice Coil” Stages feature: High Speed, and 0.1 Micron Accuracy!

Editor — Fri, 24 Feb 2012 01:20:32 +0000

Santa Clarita, CA — A New high precision, high speed two axis voice coil positioning stage featuring 0.1 micron resolution encoders for high accuracy and repeatability is available from H2W Technologies. “Voice coil” or “Moving coil” motors are recognized for their low moving mass and high acceleration/deceleration. Therefore voice coil driven positioning stages are ideal for short stroke, closed loop, applications requiring high resolution, and high acceleration/deceleration control. Typical applications can include: Semiconductor testing and assembly, inspection and test, laser micromachining, and applications in research laboratories, and manufacturing, medical, and defense industries.

This compact two axis voice coil driven positioning stage (shown) features a 25 mm x 25 mm (1 in. x 1 in.) stroke, high precision cross roller stages, and two voice coil actuators in parallel driving the bottom stage to double the load and acceleration/deceleration capabilities. Continuous force (top axis) is 10.2 N (2.3 lbs) and 30,7 N (6.9 lbs) peak. The bottom axis has a continuous force of 20.5 N (4.6 lbs) and 61.4 N (13.8 lbs) peak. This two axis positioning stage can be driven with standard DC servo or DC linear amplifiers and a two-axis programmable motion controller.

Pre drilled mounting holes in the base and stage allow for easy installation in new or existing applications. Additionally, voice coil stages are available with strokes of 6.4 mm (0.25 in.) to 76 mm (3.0 in.) and with continuous force to 445 N (100 lbs), peek to 1335 N (300 lbs). Custom Voice Coil stages from H2W Technologies are available as complete plug-and-play positioning systems. Totally custom systems can be shipped in 3 to 4 weeks from receipt of order.

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.