Electricity: motive power systems – Motor-reversing – Periodic- or intermittent-reversing
Patent
1986-09-16
1989-08-15
Ro, Bentsu
Electricity: motive power systems
Motor-reversing
Periodic- or intermittent-reversing
318138, 318443, 318254, H02P 122, H02P 312
Patent
active
048578142
ABSTRACT:
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.
REFERENCES:
patent: 4390826 (1983-06-01), Erdman et al.
patent: 4446706 (1984-05-01), Hartwig
patent: 4540921 (1985-09-01), Boyd, Jr. et al.
patent: 4550282 (1985-10-01), Hartwig et al.
patent: 4614903 (1986-09-01), Betsch et al.
Fisher & Paykel
Ro Bentsu
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