| 摘要 |
<p>A control device for driving the drum of a washing or drying machine for laundry is designed to vary the rate for rotating the motor (2) of the machine in case the electric windings (4, 9) are excessively heated. The device comprises an electronic comparator (57) adapted to compare the voltages generated by a temperature sensor (3) disposed near the windings (4, 9) for detecting their heating temperature, with a predetermined reference voltage in such a way that, in accordance with this comparison, it controls the drive of the motor (2) at different rates via logic AND circuits (63, 64) connected with respective logic commutators (65, 66) or via a logic AND circuit (73) adapted to drive the motor (2) at a slower rate so as to allow it to cool gradually if its windings are overheated. In this way, given that the motor (2) is not switched off since the thermal link (7) connected with the windings (4) thereof does not intervene, one obtains efficient washing and drying programs without any necessity of oversizing the motor.</p> |
