| 摘要 |
The present invention relates to a for controlling and driving a pump for household appliances driven by a synchronous electric motor including a permanent-magnet rotor (3) and associated to an electronic controller (1) receiving at its input a synchronizing signal (5) of the motor supply voltage (V) and at least a second signal (7) being proportional to the current (I) supplied to the motor; the method comprising the following steps: measuring the motor supply voltage (V); measuring the current (I) supplied to the motor; computing the phase shift angle (Õ) between the voltage (V) and the current (I) applied to the synchronous motor (3); evaluating the measuring stability of the phase shift angle (Õ) in a convenient time period and using such a stability as an index of a stable full load pump operation; interrupting the pump operation for a short period of time in case of measured instability of the phase shift angle (Õ). |
