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Power Factor Improvement with Single Phase Diode Rectifier in Interior Permanent Magnet Motor

G.Sukant, N.Jayalakshmi

The variable-speed ac motor drive systems used in home electrical appliances are required to have power factor correction circuits. The primary goal is to achieve the reduction of harmonic contamination in the source side and the improvement of transmission efficiency. A new power factor correction method using an inverter-driven interior permanent magnet motor is proposed here. The proposed system realizes the high power factor of a single-phase diode rectifier by using a three-phase pulsewidth modulation inverter and an IPM motor. The inverter has two functions. It regulates the velocity of the IPM motor and it controls the source-side-current waveform by regulating d-q axis current synchronous with input voltage. High power-factor operation is obtained at the source side by regulating the inverter output power for the single-phase to three-phase converter with the reduction of size, weight and power loss of the circuit. Thus, an improved power factor can be achieved by the proposed control method higher than that of the conventional control methods.