三相异步电动机拖动恒转矩负载进行变频调速时,为了保证过载能力和主磁通不变,则电源电压U1应随电源频率f按( )律调节。
发布时间:2025-12-14
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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69445' and id < 4497259 and id<>'4497259' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69445' and id > 4497259 and id<>'4497259' order by id asc limit 5
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