How to identify the quality of stepper motors?

A stepper motor is a device that converts electrical pulses into angular displacement. When receiving a pulse signal, the motor rotates at a fixed angle according to the set direction. The angular displacement can be controlled by controlling the number of pulses to achieve precise positioning. ;At the same time, the speed and acceleration of the motor rotation can be controlled by controlling the pulse frequency to achieve speed regulation.

Stepper motors use electronic circuitry to convert direct current into time-divided power. Multi-phase sequence control current is used to power the stepper motor. So during use, if the stepper motor fails to operate normally, what methods can we use to determine whether it is damaged?

First of all, without connecting any equipment or wiring, separate the stepper motor, do not touch the wires, and turn the shaft by hand. The fine motor only needs to have a certain strength to rotate smoothly without any jamming. If there is jamming or failure to rotate, the motor is damaged. It is also possible that the bearings, rotor and stator are worn. Excessive force may cause injury.

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How to identify the quality of stepper motors?