main pole winding
... main supporting pole 主支柱 main pole winding 肢线圈 ; 主极绕组 main pole gap 主磁极间隙 ...
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当电机作四极运转时，先按二极运转启动，然后切换开关使主绕组抽头A2与A4连接电机既作四极运转，此时副绕组开路。
When the motor runs in four-pole mode, it is started at two-pole mode and taps A2 and A4 are then connected together. In the meantime secondary winding is open.
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