ABSTRACT

Sudirman.  Pulse Width Modulation (PWM) Controlled DC Motor Performance Analysis (supervised by Rhiza S. Sadjad and Zahir Zaenuddin).

The goal of this research project is to investigate the performance of a DC motor controlled by a PWM type of rectifier as compared to the one controlled by a conventional non-PWM type. An RLC-circuit model of single phase armature-controlled …… HP DC motor is derived to develop a simulation in P-SPICE rev. 7.1. for the purpose of analysis.

The performance is evaluated at the AC input side of the system. The conventional non-PWM rectifier – for the output power at the DC side varying from 3.7 to 4.4 kW – produces harmonics at the AC side with THD of 0.52 to 0,58, and displacement angle varying from 149o to 152o with the power factor of 0,57 – 0,68. A PWM scheme with 4 pulses per half-cycle has created harmonics with higher THD of 0,63 to 0,71 but smaller displacement angle of – 16,9o to 26,69o to make an improvement of the power factor up to 0,72 – 0,81. A better scheme of PWM rectifier is with 8 pulses per half-cycle. This scheme reduces the THD at the AC side down to 0,15 – 0,16 and increasing the power factor up to 0,97 – 0,98 for the same output power at the DC side. 

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