| 摘要 |
In a method for starting an electric motor, which is operated by alternating current and which has a stator (1) with a main winding (H) and a first auxiliary winding (AUX1) and a rotor with permanent magnets and at least one short-circuit winding, it is ensured that, in order to avoid a pole changing when starting against a high load torque until the rotor has reached synchronism with the rotating field generated by the stator windings, that first auxiliary winding (AUX1) and a second auxiliary winding (AUX2) of the stator (1) are alternatingly supplied with the alternating current in dependence of the alternating current polarity, until the rotor has reached an oversynchronous speed, after which the alternating current supply to the auxiliary windings (AUX1, AUX2) is interrupted or reduced, the current of the auxiliary windings (AUX1, AUX2) being supplied phase-shifted in relation the alternating current (iH) being supplied to the main winding (H). For the same purpose, the motor is designed in such a way that the stator (1) has a second auxiliary winding (AUX2) and the magnetic axes (AAUX1, AAUX2) of the auxiliary windings (AUX1,AUX2) define an angle (alpha).
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