This paper refers to an application study of TRIAC to PSC motor for the hermetic compressor. It is well known that TRIAC delays phase angle of the current and has no losses if it is considered as ideal switch. Therefore it is possible to get a kind of variable capacitor by connecting TRIAC with capacitor in series and Controlling the firing angle of it. By use of this variable capacitor for PSC motor, we could obtain the performance similar to CSR motor. Therefore we believe that this type motor should he developed as one of the single phase motor for the hermetic compressor with the progress of the electronics.
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