H - Electricity – 02 – P
Patent
H - Electricity
02
P
318/55, 341/92
H02P 6/00 (2006.01) D06F 33/02 (2006.01) G05B 19/04 (2006.01) H02P 7/44 (1990.01)
Patent
CA 1290802
ABSTRACT OF THE DISCLOSURE A control apparatus and method of cyclically controlling the supply of power to an electric motor having a rotor and a stator, which method includes the steps of setting a desired time of rotation of said rotor in one direction, starting rotation of said rotor in said one direction, setting an initial "power on" time during which power is applied to said motor, switching off power at the end of said initial "power on" time, causing the rotor to slow until in a condition for reversal as hereinbefore defined, checking the ramp down time the rotor takes to slow to a condition for reversal,(as hereinbefore defined), causing reversal of direction of rotation of said rotor, applying power to said rotor for a further "power on" time which is such that said further "power on" time plus said ramp down time equals said desired time, switching off power to said rotor at the end of said further "power on" time, checking the next ramp down time reversing direction of the rotor to said one direction when said rotor is in condition for reversal and applying power to said rotor for a still further "power on" time which is such that said still further "power on" time plus said next ramp down time equals said desired time, and repeating the cycles for a desired length of time, adjusting the "power on" time at desired intervals of time so that the adjusted "power on" time for a further half cycle plus the ramp down time for a previous half cycle equals said desired time. The motor is preferably used in a closed washing machine or similar application.
615492
Fisher & Paykel Limited
Riches Mckenzie & Herbert Llp
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