Speed Performance of a BLDC Motor Employing PWM/PAM Control Technique

ABSTRACT Permanent magnet brushless DC motors finds wide applications in industries due to their high power density and ease of control. These motors are controlled using a three phase power semiconductor bridge. This paper deals with a novel control technique based on PWM & PAM control of brushless DC motor (BLDC). For inverter-controlled Brushless DC Motor (BLDC) drives, the inverter can be controlled by either Pulse-Width Modulation (PWM) technique with a constant DC link voltage or Pulse-Amplitude Modulation (PAM) technique. PAM modulates the inverter power devices using 120-degree modulation technique and controls the amplitude of the DC link voltage. The results show that Pulse amplitude modulation control improves the speed performance of BLDC motor at high speeds. The simulation results of BLDC motor drive with PWM & PAM control techniques are shown in the MATLAB/Simulink environment.