Electrical motor monitoring system for a domestic appliance

Details Electrical motor monitoring system for a domestic appliance Electrical motor monitoring system for a domestic appliance

1990-03-30

1991-12-24

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Primary circuit control

68 1201, 318729, H02P 540

Patent

active

050756133

ABSTRACT:
A drive system for an automatic washer or dryer having a rotatable drum about a horizontal axis. An induction motor drives the drum and is connected to and disconnected from a source of alternating voltage by a microprocessor to control the speed of the motor. The microprocessor senses the zero crossing of the alternating voltage and the zero crossing of alternating current flowing in the motor to determine the time to connect the motor to the alternating voltage. The microprocessor analyzes successive readings of the motor's back emf to detect undesirable load distributions and effect redistribution.

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