LAUNDRY MACHINE

摘要

A laundry washing machine having a drain pump operating regime where the pum p is turned off briefly at periodic intervals to minimise blocking. The pump may be powered by a variable frequency, variable duty cycle drive to minimise the effects of ventilation and varying main supply voltage. The spin tub is braked by dumping the electrica l energy regenerated by the main motor into the inductive winding of an ancillary motor, such as a pump motor, or of a solenoid valve. A method of powering on and off a laundry washing machine and an optocoupler drive circuit are also disclosed.