异步电动机的变频调速中,当频率高于额定频率时,需保持电压不变,此时电机处于恒功率调速阶段;当频率低于额定频率时,需保持 U/f 不变,处于恒转矩调速阶段。( )(0.5)
发布时间:2025-11-29
A.正确
B.错误
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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69423' and id < 4495294 and id<>'4495294' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69423' and id > 4495294 and id<>'4495294' order by id asc limit 5
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