Slip controlled induction motor using variable frequency transducer and method for controlling slip

摘要

A slip controlled induction motor using a variable frequency feedback transducer comprises a motor stator, a motor rotor and a variable frequency feedback transducer (VFFT). The VFFT includes an input winding transformer coupled to an output winding by a VFFT rotor. The VFFT rotor is operably connected to the motor rotor so as to rotate with the motor rotor at the same angular velocity. The input winding is excited with an input AC voltage of predetermine frequency. The transformer coupling combines the predetermined frequency AC input with the signal produced by the VFFT rotor to produce a variable frequency signal in the output winding which is fed as an input to the motor stator. Since the stator input is tied to the motor rotor angular velocity, the stator input will always have a constant absolute frequency difference with the motor rotor.