Influence of PWM Modes on Commutation Torque Ripples in Sensorless Brushless DCMotor Control System

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Brushless DC motors with permanent magnet excitation rotor have a series of advantages such as small volume , light-weight , simple structure, reliable operation,efficient energy-saving and easy control .It is widely applied in office automation , computer peripheral devices , instruments , domestic electric appliances, etc .[ 1] With the rapid development of senserless control technology the disadvantages of brushless DC motor such as difficulty in mounting and maintenance are gradually overcome .Under the condition of light-load starting , the sensorless blushless DC motor has become a good choice , especially in domestic electric appliances.