Development Of Stepper Motor
Stepper motors were developed in the same period as electromagnets and plunger pumps. Frenchman Floman proposed a method to convert the attractive force of electromagnets into rotational torque. At that time, the switching of the excitation phase was completed by the contact point of the mechanical cam, which was the prototype of the stepper motor. There are still rotating coil application methods.
The stepping motor was first put into practical use in 1920. It is called VR (Variable Relutance) type stepping motor, which is used by the British Navy for positioning control and remote control.
It was originally used as a low-speed synchronous motor, and thereafter, a two-phase 1.8-degree stepping motor with a step angle of 1.8 ° was developed by Superior Electric and Sigma Instruments of the United States. At that time, the commutation pulse was only 300pps (now 10 ～ 20kpps) because of the relationship between low current, large inductance, and constant current drive.
The large-scale application of stepper motors was in 1977. Two-phase stepper motors were used to drive FDD (floppy disk drive) output shafts. In the late 1950s, the invention of transistors was gradually applied to stepper motors, making digital control easier.
After continuous improvement, stepper motors have been widely used in mechanical systems that require high positioning accuracy, high resolution, high responsiveness, and reliability. In machines that require automation, labor saving, and high efficiency in the production process, we can easily find the trace of the stepper motor, especially for flexible controllable occasions that value speed, position control, and require precise operation of various command actions. Get the most.