A Precision Fit
Line of stepper motors and linear actuators uses technology for customization.
A line of sub-fractional horsepower stepper motors and linear actuators has been designed to provide precise performance-to-size ratios. They can be used in medical equipment, instrumentation, industrial equipment, machinery automation, HVAC applications, office equipment, and many other custom applications. The products are engineered to be versatile, making them suitable for customization and manufacturing.
The linear actuators, boasting various patent-pending designs, use a proprietary manufacturing process that incorporates engineering thermoplastics in the rotor drive nut and a stainless steel acme lead screw. This design is engineered to make the motor quieter, more efficient, and more durable than the V-thread and bronze nut configuration commonly used in actuators. In addition, motor life is said to be 10 times better than that of the traditional bronze nut style. Also, no maintenance is required. An additional feature is a bearing pre-load adjustment, which does not protrude from the motor configuration as it does in other designs.
Back To Basics
The basic stepper motor creates rotary motion of a magnet rotor core through the use of pulses and electromagnetic fields passing around the core. A linear actuator can be used to convert this rotational motion into linear motion. However, precision is dependent upon the step angle of the actuator's rotor and the method chosen to accomplish the conversion.
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The linear actuator that uses a screw has its precision dependent on the thread pitch. Inside the rotor of a linear actuator, a nut is located in the center of the rotor. Also a corresponding screw is engaged in the nut. In order for the screw to move axially, the screw must be constrained from rotating with the nut and rotor assembly by some means. With anti-rotation of the screw, linear motion is achieved as the rotor turns. Anti-rotation is typically accomplished either internally with captivation of a shaft screw assembly or externally with a nut on the screw shaft that is in some way prevented from rotation yet free along its axis.
Technical Specs
The various patent-pending designs in the sub-fractional horsepower stepper motor and linear actuator line were developed to open up new avenues for equipment designers who require high performance and endurance. The units come in a variety of sizes ranging from 15 to 87 mm2 and in captive, non-captive, and external linear designs. Hybrid Size 17 and 23 devices also come in linear rotary versions.
Available are more than 30 different travels per step ranging from 0.00006 to 0.016 in. The 87-mm unit delivers up to 500 lbs of force.
More information is available by contacting Haydon Switch & Instrument Inc., 1500 Meriden Rd., Waterbury, CT 06705, calling 800-243-2715, visiting www.his-inc.com, writing in 35 on our reader service card, or replying online at www.pddnet.com.
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