| 摘要 |
<p>The present invention relates to a control device for an asynchronous electric motor (2), intended especially for the tracking system of an electric-type vehicle. This control device comprises electrical power supply means (10) capable of producing an alternating power supply voltage, the frequency (FAL) and the amplitude (UAL) of which can be set independently of one another. For a given frequency of the power supply voltage, the amplitude of this voltage is capable of varying between a minimum value and a maximum value, the frequency difference between the rotational frequency of the magnetic field rotating in the region of the rotor and the rotational frequency of this rotor being kept substantially constant as long as the amplitude of the power supply voltage is less than the said maximum value. Once this maximum value is reached, the torque on the shaft of the motor (2) is increased by an increase in the slip. <IMAGE></p> |
