H - Electricity – 02 – P
Patent
H - Electricity
02
P
H02P 6/08 (2006.01) D06F 23/00 (2006.01) D06F 35/00 (2006.01)
Patent
CA 2057955
A method of cyclically accelerating an electric motor for example for use during an agitation cycle in a laundry machine. A desired speed, direction of rotation and acceleration time is set and power is applied to the motor in a series of incremental steps, each successive step corresponding to an increase in the level of power applied during the previous step. The steps are initially estimated to be sufficient to enable sufficient energy to be supplied to the motor for it to reach the desired speed in the acceleration time. The speed of the motor is monitored and the steps of accelerating the motor are repeated with the series of incremental steps adjusted to adjust the supply of energy to the motor dependant on the speed reached in the acceleration time of the previous cycle.
Ensor David John
Fisher & Paykel Limited
Riches Mckenzie & Herbert Llp
LandOfFree
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