H - Electricity – 02 – P
Patent
H - Electricity
02
P
318/55, 342/13.4
H02P 6/00 (2006.01) D06F 33/02 (2006.01) D06F 37/30 (2006.01) G05B 19/04 (2006.01) H02P 23/00 (2006.01)
Patent
CA 1288465
Abstract of the Disclosure IMPROVEMENTS IN OR RELATING TO ELECTRONIC MOTOR CONTROLS, LAUNDRY MACHINES INCLUDING SUCH CONTROLS AND/OR METHODS OF OPERATING SUCH CONTROLS 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 polarits 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.
518195
Fisher & Paykel Limited
Riches Mckenzie & Herbert Llp
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