Three-phase motor for extend the △ access to single-phase operation circuit

Published:2011/7/9 9:34:00 Author:Lucas | Keyword: Three-phase motor | From:SeekIC

Extension three-phase motor with △-connection is suitable for 220V or 380V single-phase power operation. The circuit is shown below. The principle of this connection is the same to that of Y-connection, but there are some differences either. (1) It can be seen from the figure that only one U phase-phase winding is the main winding among the motor windings. And the V phase and W phase are connected in series as auxiliary windings. (2) Winding U and winding V, W form an autotransformer. Due to the boosting function of the autotransformer, capacitors C1 and C2 are exposed to bear voltage which is three times of that of the single-phase power supply. As a result, a capacitor with a high working voltage is needed to be used, such as a capacitor of 1000V.



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