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【多选题】
关于三相异步电动机的回馈制动,下列说法正确的是A.
回馈制动发生在电动机转速高于磁场转速时
B.
回馈制动可以应用在起重机下放重物
C.
回馈制动时，电动机工作在发电机状态下
D.
回馈制动时，电动机虽然在制动状态下，但转速还有短时增加，达到平衡点停止增速
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