Advantages and Applications of Linear Stepper Motors

Posted by Jack Wang on October 28th, 2015

Linear stepper motors are utilized for applications that require a steady position with high-speed motion and rapid acceleration, but with low mass payloads. The mechanism of a linear stepper motor is simple. The open loop precise operation makes this motor system capable of a high throughput, which creates high acceleration. 

Linear stepper motors are not subject to similar limitations in linear acceleration and velocity (unlike when a system converts a rotary motion to linear movement). For instance, when the leadscrew's inertia exceeds the load's inertia, attempting high-speed motion with low mass payload will apply most of the motor torque. The screw's inertia increases as the length increases, resulting in the reduction of maximum critical speed. With a linear stepper motor, the motor applies all the force efficiently to the load. Hence, system inertia does not have to be affected by the length of the screw. 

Using a linear stepper motor eliminates the need for belts, pulleys, or leadscrews due to the pre-engineered mechanical design. This way, you can enhance the mechanical simplicity of your system. Linear stepper motors may be mechanically simple, but they are highly reliable. An air bearing that does not have any friction combined with fewer moving parts ensure longevity and a maintenance-free system. 

Linear stepper motors are known for their long travel; the length is limited by the platen's length. Moreover, you get the same performance even when you increase the length of the platen. A linear stepper motor offers a more precise open-loop mechanism, and this unidirectional repeatability will not compromise feedback devices. Linear motors are typically smaller compared to systems where rotary movement must be converted to linear motion. Hence, X-Y movement is easily accomplished, especially when the assembly requires it. The same platen can have more forcers operating on it with overlapping trajectories, resulting in multiple motions. 

Linear motors can be the solution to various applications that require low-mass and high-speed moves. Hence, they are good alternatives to typical rotary-to-linear conversion techniques like rack and pinion, hydraulic and pneumatic actuators, and belt drives. With linear stepper motors, you can easily program the acceleration, distance, and speed in a repeatable manner. This way, they are useful in applications like printed circuit board assemblies, gauging, industrial sewing machines, laser trim and cutting systems, X-Y plotters, and wire harness making. 

Also, you can easily get your suitable linear stepper motor from any of the leading custom electric motor manufacturers and suppliers. Custom electric motor manufacturers can provide you various linear stepper motors like NEMA 8, NEMA 11, NEMA 14, NEMA 17, NEMA 23, NEMA 34 and many more with different specifications.     

About the Author: 

This article is written by Jack Wang who is associated with GEMS Motor. Jack got his Bachelor's degree in Mechanical Engineering and Master's degree in Electrical Engineering, specialized in electric motor design and motor driver development. Jack was born in greater Shanghai area, China, and had several years of study and work experience in the United States. With the deep knowledge of electric motors and great bilingual skills in Mandarin and English, Jack helps market our electric motor products worldwide. Jack currently holds the position of Director of Marketing at GEMS Motor.