Motor speed control for washing machine

Details Motor speed control for washing machine Motor speed control for washing machine

1998-08-31

1999-11-09

Coe, Philip R.

Textiles: fluid treating apparatus

Machines

Single tub and automatic sequential operation mechanism

68 1202, 68 1212, 68 1214, D06F 3302

Patent

active

059791942

ABSTRACT:
A full-automatic washing machine with an electric motor for driving an agitator and a dehydration tub includes an inverter main circuit including a plurality of switching elements connected to windings of a plurality of phases of the motor respectively, and a control device for driving the switching elements of the inverter main circuit. The control device executes an increase rate changing control in which a rotational speed of the motor is changed among a plurality of increase rates during drive of the motor in at least one of operation steps between a wash step and a final dehydration step before the motor reaches a final target speed.

REFERENCES:
patent: 4513464 (1985-04-01), Rettich et al.
patent: 4782544 (1988-11-01), Nystuen et al.
patent: 5092140 (1992-03-01), Matsuo et al.
patent: 5704136 (1998-01-01), Cho

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