MSEE Thesis.


Brushless do motors have received significant attention in the fractional horsepower motor industry in recent years. The inverter drive used with this system has traditionally been of the full bridge configuration. However, it is possible to use a half bridge inverter to drive the machine. In this paper a method to analyze the brushless dc motor with half bridge inverter is developed. The method is integrated into a digital computer program to simulate the steady state response of the system. The program allows both the inverter conduction angle and the inverter firing angle to be changed. This provides an efficient means of evaluating the effects of system parameters as well as inverter operating modes on the performance of the system. The results of the simulation will demonstrate reductions in efficiency and torque pulsations as well as an increase in average torque as the conduction angle of the inverter is increased from 120 degrees to 180 degrees.

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