凸极同步发电机在励磁绕组断线后电磁功率不为零的原因主要是（）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='32656' and id < 2596491 and id<>'2596491' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='32656' and id > 2596491 and id<>'2596491' order by id asc limit 5