Improvements Relating to Washing Machines

摘要

- 49 The present invention relates to a washing machine (7) and pump (8) for a washing machine (7). The pump is driven by a brushless DC motor (38). The pump can be controlled to improve the 5 operation of the washing machine. In one aspect the invention comprises a washing machine (7) with a variable speed pump (8) for pumping out wastewater, a controller (50) for controlling the speed of the putnp and a sensor (10) for determining the flow-rate of water being pumped from the washing machine, wherein the controller (50) controls the speed of the pump to maintain the flow-rate at a desirable level. Controller Level 52 Sensor User Circuitry Interface 54- TIMERS Current MEM Y OlSensors I Y Motor Valve 14 Controller Inlet - 56 Controller - 51 Monitor water level Determine flow-rate to drain Too high Flow-rate Yes is acceptable > 73 Too low 74 Decrease Increase motor speed motor speed of pump of pump