A braking controller of a three-phase permanent magnetic brushless DC motor for directly driving a screw pump

摘要

A braking controller of a three-phase permanent magnetic brushless DC motorfor directly driving a screw pump includes a detection circuit for detectingpower supply states of the three-phase permanent magnetic brushless DC motorand a braking circuit for controlling the braking startup according to the powersupply states of the three-phase permanent magnetic brushless DC motor. Whenthe motor is supplied with power, the braking circuit is cut off. When the motoris not supplied with power and the screw pump drives the motor to reverse, the brakingcircuit starts up.