Three-phase motor infinitely-variable speed setter - for asynchronous motors with slip-ring rotors reduces maintainance costs

摘要

The unit is for infinitely-variable speed regulation of asynchronous three-phase motors and comprises a three-phase generator for supplying the electrical energy to the three-phase motor, the three-phase generator being provided with a three-phase field (excitation) winching that is connected to a frequency changer (11). The direction of rotation of the exciter field, relative to that of the rotor containing the field (excitation) winding is specifically opposite to that of the rotor itself.