Electricity: motive power systems – Limitation of motor load – current – torque or force
Patent
1996-07-11
1998-03-10
Martin, David S.
Electricity: motive power systems
Limitation of motor load, current, torque or force
318254, 318281, 318285, 68 1202, H02P 602
Patent
active
057265461
ABSTRACT:
A laundry washing machine in which the period of each agitation stroke (comprising "ramp", "plateau" and "coast" phases) is controlled by adjusting the "coast" phase of each stroke in order to maintain consistent washing performance. The "coast" phase is initiated (after a predetermined period has elapsed in the "plateau" phase) by starting a timer and allow the motor to coast until the motor velocity drops to a predetermined reversal velocity at which point the motor is reversed to begin the next agitation stroke. The value of the timer when the velocity reaches the reversal velocity is compared to a desired value or range of values. The predetermined value of the reversal velocity is increased if the timer value is greater than the desired value or range of values. Alternately, the value of the reversal velocity is decreased if the timer value is less than the desired value or range of values. The period of the coast phase of the next agitation stroke should then be closer to the desired period.
REFERENCES:
patent: 3599062 (1971-08-01), Crane
patent: 4540921 (1985-09-01), Boyd, Jr. et al.
patent: 4857814 (1989-08-01), Duncan
patent: 5341452 (1994-08-01), Ensor
patent: 5398298 (1995-03-01), Ensor
Fisher & Paykel Limited
Martin David S.
LandOfFree
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