A Method of Analysis for the Capacitor Motor Controlled by a Triac.

概要

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A method is given for calculating the extinction angle β and induced voltage eF during open circuited period of the capacitor motor controlled by a triac. Three kinds of control circuits, (1) connected with the main phase winding, (2) with auxiliary winding, (3) with both windings, are investigated. The terminal voltage eT during open circuited period is obtained from eT=eF in the circuit (1). The difference voltage VD between two phases, in the circuit (3), is obtained, and superposed on the circuit. Values of β and eF are calculated by a iterative solution using the symmetrical components method. Effects of the firing angle α and slip s on β are investigated on a test motor. Variations of the fundamental component voltages as a function of α, controlled by the three kinds of circuits, are investigated.
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