发明名称 |
METHOD AND APPARATUS FOR CONTROLLING A MOTOR |
摘要 |
The invention concerns a method and an apparatus for controlling a three-or-more-phase motor driven by a frequency converter. In the method, a change-over switch of the frequency converter is controlled to a continuously conducting state and at the same time the phase voltages or phase currents of the other phases are controlled by switching the change-over switches in those motor phases at a switching frequency substantially higher than the frequency of the fundamental wave of the phase voltage or phase current. The apparatus comprises in conjunction with the frequency converter a number of change-over switches, at least one change-over switch for each motor phase. The change-over switches comprise controllable change-over contacts. The apparatus further comprises in conjunction with the frequency converter means for determining the motor phase currents and means for controlling the change-over contacts.
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申请公布号 |
US2009322273(A1) |
申请公布日期 |
2009.12.31 |
申请号 |
US20090488937 |
申请日期 |
2009.06.22 |
申请人 |
KALLIONIEMI ANTTI;STOLT LAURI;KAUPPINEN TUUKKA |
发明人 |
KALLIONIEMI ANTTI;STOLT LAURI;KAUPPINEN TUUKKA |
分类号 |
H02P27/04 |
主分类号 |
H02P27/04 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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