The DC motor is directly started, and its inrush current can be as high as 10~20 times of rated current. In this way, the DC power supply is required to be high, and the rotation speed of the motor is not controlled, which is easy to cause a flying vehicle, and is liable to cause mechanical damage. Therefore, the general requirements: DC motors with power less than 2 kW are allowed to start with varistor; DC motors with power greater than 2 kW should be multi-stage varistor or voltage regulator to reduce voltage and then gradually start up.
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