Simplified adjustable speed drive for residential applications

This paper describes an adjustable speed drive (ASD) for residential applications such as compressors and fans in heat pumps, air conditioners, and refrigerators. The ASD uses only a four-diode rectifier and a six-transistor six-diode inverter and does not require a source-frequency filter inductor or capacitor, Motor speed is adjusted with source-frequency phase control eliminating the switching loss and electromagnetic interference caused by the more-commonly used high-frequency pulse-width modulation (PWM). A full-load operating point with reasonable power factor and source-current distortion is found using a parametric analysis.<
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