发明名称 |
Speed control apparatus for induction motor |
摘要 |
A control apparatus for an induction motor includes a current detector for detecting the current of the induction motor; a first coordinate transformer for resolving the current into an exciting current component and a load current component; a slip value calculator for calculating a slip angular frequency of the induction motor based on the load current component; a correction value calculator for calculating a correction value for the slip angular frequency of the induction motor in response to the change of the exciting current component; a multiplier for correcting the slip angular frequency by using the correction value calculated in the correction value calculator; an adder for calculating a reference primary angular frequency based on the corrected slip angular frequency; a voltage vector calculator for calculating a reference voltage value based on the reference primary angular frequency; and a second coordinate transformer for feeding the calculated reference voltage value to the inverter. The control apparatus keeps the rotating speed of the induction motor at a predetermined value when the slip frequency change occurs due to temperature rise in the induction motor.
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申请公布号 |
US6075337(A) |
申请公布日期 |
2000.06.13 |
申请号 |
US19990309909 |
申请日期 |
1999.05.11 |
申请人 |
FUJI ELECTRIC CO., LTD. |
发明人 |
ISHII, SHINICHI;TAJIMA, HIROKAZU |
分类号 |
H02P21/08;(IPC1-7):H02P5/34 |
主分类号 |
H02P21/08 |
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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