Patent ID: 6320350
Filing Date: 2001-11-20
Classification: H02K,H02P

Abstract:
An electric automobile comprising:a rotary shaft;an AC generator as an AC power source, including an engine driven with a predetermined rotation speed to generate constant AC voltage;a mechanical modulator including a modulator rotor, a modulator stator winding, and a modulator rotor winding connected to said AC power source and provided on said modulator rotor, for receiving said AC voltage from said AC power source by said modulator rotor winding, and for generating a multiphase amplitude-modulated voltage from said received AC voltage in said modulator stator winding, said amplitude-modulated voltage having a frequency proportional to the number of rotations of said modulator rotor winding; anda modulation motor including a motor rotor, a motor stator winding connected to said modulator stator winding, and a motor rotor winding connected to a pair of thyristors thereby constituting an electric load, wherein said motor stator winding generates an alternate rotary magnetic field of an alternate main magnetic flux in response to said multiphase amplitude-modulated voltage from said modulator stator winding, and said motor rotor winding is rotated in response to said alternate rotary magnetic field,wherein said rotary shaft is connected to said modulator rotor which is connected to said motor rotor, andwherein the modulation frequency is controlled by using synchronous torque generated by said modulation motor.