Motor with circuits for protecting motor from input power outages or surges

Abstract

A DC motor is provided. The DC motor prevents rush or overload of current in the DC motor during and/or after power input irregularities to the DC motor. A control circuit of the DC motor is configured to control current provided to the DC motor. When power irregularities in the power input to the DC motor are detected by the control circuit, the control circuit stops generating PWM (Pulse Width Modulated) signals and stops the current provided to the DC motor. After the stoppage of PWM signals, the control circuit can perform a soft-start of the PWM signals when the power irregularities are no longer detected. The soft starting of the PWM signals generates gradual increase in current to the DC motor, thus, preventing sudden rush of current that cause malfunction of the DC motor.

What is claimed is: 
     
         1 . A motor apparatus comprising:
 a DC motor comprising a stator and a rotor;   an AC to DC converter configured to receive an AC power input and to convert the AC power input to a DC power;   a switching circuit configured to convert the DC power to a PWM switched power for supplying to the DC motor; and   at least one control circuit configured to detect irregularities in the AC power input, wherein upon detecting irregularities the at least one control circuit causes the switching circuit to temporarily stop supplying the PWM switched power to the DC motor and resume supplying the PWM switched power.