Saturday, September 8, 2018

Advantages and disadvantages of stepper motors

1. Step angle of stepper motor is proportional to pulse rate.
2. Stepper motor outputs its maximum torque at the moment it stops running (when winding excitation).
3. the precision of every step is controlled within the range from 3% to 5%. Plus, the error in the last step won’t be accumulated intothe next step; the stepper motor has very good position precision and good movement repeatability.
4. Excellent start-stop and reversing responses.
5. As stepper motors are brushless ones, the lifetime of stepper motor is determined by the bearings' lifespan only.
6. The response of the motor is only determined by the digital input pulse. Therefore, open-loop control can be adopted. So, theconfiguration of stepper motors can be comparatively simple. The manufacturing cost is low.
7. Synchronous rotation at ultra-low speed can be actualized when the load is coupled with the shaft of stepper motor.
8. As the speed is proportional to the pulse rate, a wide speed range can be avaliable.

1. Once stepper motor is out of control or under inappropriate control, resonance is apt to be generated.
2. Comparative high speed is not easy to be achieved.
3. Comparative high torque is not easy to be achieved either.
4. Stepper motor has no advantages in aspects of size and weight. Energy utilization ratio is comparatively low.
5. When overloading, the synchronization will be broken. Vibration and noise occur when running at high speed.


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