发明名称 |
BRUSHLESS DC MOTOR CONTROL |
摘要 |
An electronically commutated brushless DC motor primarily for fractional horsepower applications of the type where at any instant one motor winding is unpowered and used to detect back EMF zero-crossings which information is used to initiate winding commutations. The duration of the pulse produced in this winding due to dissipation of stored energy by free-wheel diodes in parallel with the commutation devices after supply of current has been removed from this winding is used to provide a measure of motor current. This allows for simplified commutation device current limiting circuits and is available for control purposes which are a function of motor torque. There is also disclosed a method for maximizing useful power output by reducing the phase angle between the motor current and the back EMF. This is accomplished by introducing a delay in commutating the motor windings beyond the occurrence of each back EMF zero-crossing, with the delay being a function of the time between commutations. |
申请公布号 |
HK1024112(A1) |
申请公布日期 |
2004.11.12 |
申请号 |
HK20000103157 |
申请日期 |
2000.05.27 |
申请人 |
FISHER & PAYKEL APPLIANCES LIMITED |
发明人 |
JOHN H. BOYD;GERALD DUNCAN;MICHAEL THOMAS GEORGE PERRY |
分类号 |
H02K29/00;H02P6/00;H02P6/06;H02P6/14;H02P6/16;H02P6/18 |
主分类号 |
H02K29/00 |
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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