Effect of Removing the Filter Capacitor in Rectifier Circuit on the Steady-state Performances of the Permanent Magnet Direct Current Motor

In order to study the effect of removing the filter capacitor in the rectifier circuit on the steady-state performances of the permanent magnet direct current motor, simulation analysis and experimental research were accomplished according to a rated voltage 300V DC, 180W, 2-poles permanent magnet direct current motor. The motor was fed by three different methods. The first method is to use standard DC power supply, the second method is to use DC from rectifier circuit with filter capacitor supplied by 220V AC, and the third method is to use DC from rectifier circuit without filter capacitor supplied by 220V AC. The results indicate that the performances of the first two methods are almost the same and the third method shows larger fluctuation of the supply voltage, electromagnetic torque and armature current, etc., lower speed, worse reversing performance, stronger vibration, louder noise and lower system efficiency.