| 摘要 |
The invention relates to a method for operating an electric machine and to an electric motor for carrying out said method, wherein a rotor winding at the rotor is designed as a rotary field winding, and wherein a stator winding is arranged on the stator, which is also designed as a rotary field winding, wherein each rotary field winding is fed from a respective inverter and wherein, on the basis of the mechanical speed and according to a characteristic curve, an electrical frequency ωS, Soll is determined from the voltage that is fed from the inverter on the stator side to the stator winding. According to the invention, the characteristic curve is formed such that the stator feed frequency is reduced to less than a minimum frequency in a rotational speed range from at least &OHgr;min to &OHgr;0, wherein &OHgr;min is a first rotational speed and &OHgr;0 is a second rotational speed, the amount of the second rotational speed &OHgr;0 being greater than the amount of the first rotational speed. |
