发明名称 |
Electric motor controls and laundry machines using such motor controls |
摘要 |
A control apparatus and method for an electric motor having sensing devices which sense the frequency and polarity of EMFs in the rotor windings down to a condition where the rotor is in condition for reversing, and causing reversing of the motor when the frequency is such as to allow reversing and the polarity of a selected winding is at or near a zero crossing between positive and negative polarities. Cyclical reversal is effected by measuring the time the rotor takes to coast from a "power off" condition to the condition for reversing and with an electronically commutated motor reversing can usually be effected in one commutation period. The motor is used in a clothes washing machine or similar application where rapid reversal is required or timing of the time from one reversal to the next is required to be constant. <IMAGE> |
申请公布号 |
GB2180672(A) |
申请公布日期 |
1987.04.01 |
申请号 |
GB19860022289 |
申请日期 |
1986.09.16 |
申请人 |
* FISHER & PAYKEL LIMITED |
发明人 |
GERALD DAVID * DUNCAN |
分类号 |
D06F33/02;D06F;D06F37/30;H02P;H02P1/40;H02P6/00;H02P6/22;H02P23/00;H02P27/06;H02P29/00 |
主分类号 |
D06F33/02 |
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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