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 ▼

1. A stator for an axial flux motor powered using at least two phases of electrical current, said stator comprising:a series of stator windings, the series being arranged in a circle which defines a circumference of the stator, the series of windings having arc sections, each of the arc sections con

1. A stator for an axial flux motor powered using at least two phases of electrical current, said stator comprising:a series of stator windings, the series being arranged in a circle which defines a circumference of the stator, the series of windings having arc sections, each of the arc sections containing windings associated with only one of said at least two phases, the arc sections being arranged such that, when current flows through the windings, each arc section provides a magnetic find which, at any given instant of time during current flow, alternates in direction along a length of each arc section; and an annular stator core, said annular stator core having a radially inner surface, a radially outer circumferential surface, and two sides extending therebetween, said annular stator core further comprising slots which extend between said radially outer circumferential surface and said radially inner surface to define teeth on one of said two sides of the annular stator core, said stator windings being defied by serpentine-shaped conductors which fit between and around said teeth, each serpentine-shaped conductor being coextensive with a respective one of the arc segments; wherein each arc section is associated with a respective one of said at least two phases such that no two arc sections carry current of identical phase; wherein the arc sections include an inter-phase separation space between adjacent ones of said arc sections, said inter-phase separation space being different from an intra-phase separation space which separates immediately adjacent windings in a single arc section; and wherein a width of the inter-phase separation space is greater than a width of the intra-phase separation space; wherein said serpentine-shaped conductors in each arc segment are stacked upon one another with an electrically insulative material disposed therebetween, each arc segment including a stack of said serpentine-shaped conductors, each stack including: a first set of substantially identical serpentine-shaped conductors stacked alternatingly through the stack, and a second set of serpentine-shaped conductors sandwiched between the serpentine-shaped conductors of the first set, said second set of serpentine-shaped conductors being substantially identical to one another but different from said first set in that, when said first and second sets are alternatingly stacked, portions of said serpentine-shaped conductors in the first set which are outside of said slots extend around opposites sides of said teeth from portions of said serpentine-shaped conductors of the second set which are also outside of said slots.