초록 ▼

An electric motor is provided with active hysteresis-based control of winding current. The motor has an efficient stator winding arrangement, as well as at least one adjustable air gap. Also provided is a stator, windings and air gap adjustment mechanism, as well as a method and system for controlli

An electric motor is provided with active hysteresis-based control of winding current. The motor has an efficient stator winding arrangement, as well as at least one adjustable air gap. Also provided is a stator, windings and air gap adjustment mechanism, as well as a method and system for controlling the torque produced by the motor using active hysteresis-based control of the motor's winding currents. The stator has its windings distributed among arc sections, the windings in each arc section being associated with only one phase of the motor. The hysteresis-based control of winding current is active in that a bandwidth or spread of the hysteresis band is adjusted depending on at least one of several selectively determined factors. The motor and its associated components are particularly well-suited for use in an electrically powered vehicle, as well as in hybrid vehicles using both electric power from a battery and electric power derived from a fuel-burning engine. A current detector is provided for generating outputs indicative of current flowing through each of three phase windings in a motor, based on detected magnitudes of current flowing through only two of the phase windings. Also provided is a discharge device for discharging residual voltage on a power bus of an electric vehicle.

대표청구항 ▼

[ We claim:] [1.] A dual stator motor with selectively variable air gaps, said dual stator motor comprising:first and second stators which are axially movable;a rotor rotatably mounted between the first and second stators, for rotation in response to magnetic fields generated by said first an second

[ We claim:] [1.] A dual stator motor with selectively variable air gaps, said dual stator motor comprising:first and second stators which are axially movable;a rotor rotatably mounted between the first and second stators, for rotation in response to magnetic fields generated by said first an second stators;a first mechanism for moving the first stator axially with respect to the rotor to vary a first air gap between said rotor and the first stator during operation of the motor; anda second mechanism for moving the second stator axially with respect to the rotor to vary a second air gap between said rotor and the second stator during operation of the motor.