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What should I do if the voltage of the DC gear motor is unstable?

Update:09-02-2022
Summary:...
When using a DC geared motor, if the voltage is unstable, the equipment will not run stably. So how to deal with this problem when operating?
1. We can connect a resistive load at both ends of the resistor to change the resistance characteristics, so that even in a low voltage state, the geared motor can still work well.
2. A benign magnetic conductive material is placed under the pole piece. The existence of the magnetic conductive material will allow the device to output a stable voltage even in the case of a relatively small excitation current.
3. An automatic excitation adjustment device can be installed to adjust the constant reactive power and constant power of the equipment through the automatic adjustment device, thereby improving the stability of the system.
The above three methods can solve the voltage instability that occurs when the DC geared motor is working, and you can refer to it as appropriate.