A three-phase switched reluctance motor torque ripple three-level suppression method. A first set of torque thresholds (th1.sub.low, th1.sub.zero, and th1.sub.up) is set in rotor position interval [0°, θ.sub.r/3]. A second set of torque thresholds (th2.sub.low, th2.sub.zero, and th2.sub.up) is set in rotor position interval [θ.sub.r/3, θ.sub.r/2]. Power is supplied to adjacent phase A and phase B for excitation. The power supplied for excitation to phase A leads the power supplied for excitation to phase B by θ.sub.r/3. An entire commutation process from phase A to phase B is divided into two intervals. In rotor position interval [0°, θ.sub.1], a phase A uses the second set of torque thresholds (th2.sub.low, th2.sub.zero, and th2.sub.up) while phase B uses the first set of torque thresholds (th1.sub.low, th1.sub.zero, th1.sub.up). Critical position θ.sub.1 automatically appears in the commutation process, thus obviating the need for additional calculations. Total torque is controlled between [T.sub.e+th2.sub.low and T.sub.e+th2.sub.up]. In rotor position interval [θ.sub.1, θ.sub.r/3], phase A continues to use the second set of torque thresholds (th2.sub.low, th2.sub.zero, and th2.sub.up), phase B continues to use the first set of torque thresholds (th1.sub.low, th1.sub.zero, and th1.sub.up), and the total torque is controlled between [T.sub.e+th1.sub.low and T.sub.e+th1.sub.up]. This suppresses torque ripples of a three-phase switched reluctance motor and provides great engineering application values.

A method for controlling a switched reluctance motor, the method comprising: receiving a reference torque T.sub.e ref; receiving an indication of a present rotor position θ for the switched reluctance motor; determining at least one of: a reference current i.sub.e.sub._.sub.ref(k−1) for a (k−1).sup.th phase, a reference current i.sub.e.sub._.sub.ref(k) for a (k).sup.th phase, and a reference current i.sub.e.sub._.sub.ref(k+1) for a (k+1).sup.th phase; and outputting the determined at least one reference current to a current controller operatively coupled to the switched reluctance motor, wherein the determined at least one reference current is based on an objective function comprising the squares of phase current and derivatives of current reference.

A method for controlling a switched reluctance motor, the method comprising: receiving a reference torque T.sub.e ref; receiving an indication of a present rotor position θ for the switched reluctance motor; determining at least one of: a reference current i.sub.e.sub._.sub.ref(k−1) for a (k−1).sup.th phase, a reference current i.sub.e.sub._.sub.ref(k) for a (k).sup.th phase, and a reference current i.sub.e.sub._.sub.ref(k+1) for a (k+1).sup.th phase; and outputting the determined at least one reference current to a current controller operatively coupled to the switched reluctance motor, wherein the determined at least one reference current is based on an objective function comprising the squares of phase current and derivatives of current reference.

A stator assembly has coils in a distributed winding configuration. A poly-phase switched reluctance motor assembly may include a stator assembly with multiple coils in a distributed winding configuration. The stator assembly may have a central bore into which a rotor assembly having multiple poles is received and configured to rotate. A method of controlling a switched reluctance motor may include at least three phases wherein during each conduction period a first phase is energized with negative direction current, a second phase is energized with positive current and there is at least one non-energized phase. During each commutation period either the first phase or second phase switches off to a non-energized state and one of the non-energized phases switches on to an energized state with the same direction current as the first or second phase that was switched off. The switched reluctance motor may include a distributed winding configuration.

A stator assembly has coils in a distributed winding configuration. A poly-phase switched reluctance motor assembly may include a stator assembly with multiple coils in a distributed winding configuration. The stator assembly may have a central bore into which a rotor assembly having multiple poles is received and configured to rotate. A method of controlling a switched reluctance motor may include at least three phases wherein during each conduction period a first phase is energized with negative direction current, a second phase is energized with positive current and there is at least one non-energized phase. During each commutation period either the first phase or second phase switches off to a non-energized state and one of the non-energized phases switches on to an energized state with the same direction current as the first or second phase that was switched off. The switched reluctance motor may include a distributed winding configuration.

A three-phase switched reluctance motor torque ripple two-level suppression method is disclosed. A first set of torque thresholds is set in rotor position interval [0°, θ.sub.r/3]. A second set of torque thresholds is set in rotor position interval [θ.sub.r/3, θ.sub.r/2]. Power is supplied to adjacent phase A and phase B for excitation. The power supplied for excitation to phase A leads the power supplied for excitation to phase B by θ.sub.r/3. Phase A is turned off while phase B is turned on. An entire commutation process from phase A to phase B is divided into two intervals. In rotor position interval [0°, θ.sub.1], phase A uses the second set of torque thresholds while phase B uses the first set of torque thresholds. Critical position θ.sub.1 automatically appears in the commutation process, thus obviating the need for additional calculations. Total torque is controlled between [T.sub.e+th2.sub.low and T.sub.e+th2.sub.up]. In rotor position interval [θ.sub.1, θ.sub.r/3], phase A continues to use the second set of torque thresholds, phase B continues to use the first set of torque thresholds, and the total torque is controlled between [T.sub.e+th1.sub.low and T.sub.e+th1.sub.up]. This suppresses torque ripples of a three-phase switched reluctance motor.

A three-phase switched reluctance motor torque ripple two-level suppression method is disclosed. A first set of torque thresholds is set in rotor position interval [0°, θ.sub.r/3]. A second set of torque thresholds is set in rotor position interval [θ.sub.r/3, θ.sub.r/2]. Power is supplied to adjacent phase A and phase B for excitation. The power supplied for excitation to phase A leads the power supplied for excitation to phase B by θ.sub.r/3. Phase A is turned off while phase B is turned on. An entire commutation process from phase A to phase B is divided into two intervals. In rotor position interval [0°, θ.sub.1], phase A uses the second set of torque thresholds while phase B uses the first set of torque thresholds. Critical position θ.sub.1 automatically appears in the commutation process, thus obviating the need for additional calculations. Total torque is controlled between [T.sub.e+th2.sub.low and T.sub.e+th2.sub.up]. In rotor position interval [θ.sub.1, θ.sub.r/3], phase A continues to use the second set of torque thresholds, phase B continues to use the first set of torque thresholds, and the total torque is controlled between [T.sub.e+th1.sub.low and T.sub.e+th1.sub.up]. This suppresses torque ripples of a three-phase switched reluctance motor.

A four-phase switched reluctance motor torque ripple two-level suppression method. A first set of torque thresholds is set in rotor position interval [0°, θr/4]. A second set of torque thresholds is set in rotor position interval [θr/4, θr/2]. Power is supplied to adjacent phase A and phase B for excitation. The power supplied for excitation to phase A leads the power supplied for excitation to phase B by θr/4. An entire commutation process from phase A to phase B is divided into two intervals. In rotor position interval [0°, θ1], phase A uses the second set of torque thresholds while phase B uses the first set of torque thresholds. Critical position θ1 automatically appears in the commutation process, thus obviating the need for additional calculations. Total torque is controlled between [Te+th2low and Te+th2up]. In rotor position interval [θ1, θr/4], phase A continues to use the second set of torque thresholds, phase B continues to use the first set of torque thresholds, and the total torque is controlled between [Te+th1low and Te+th1up]. This suppresses torque ripples of a four-phase switched reluctance motor and provides great engineering application values.

A four-phase switched reluctance motor torque ripple two-level suppression method. A first set of torque thresholds is set in rotor position interval [0°, θr/4]. A second set of torque thresholds is set in rotor position interval [θr/4, θr/2]. Power is supplied to adjacent phase A and phase B for excitation. The power supplied for excitation to phase A leads the power supplied for excitation to phase B by θr/4. An entire commutation process from phase A to phase B is divided into two intervals. In rotor position interval [0°, θ1], phase A uses the second set of torque thresholds while phase B uses the first set of torque thresholds. Critical position θ1 automatically appears in the commutation process, thus obviating the need for additional calculations. Total torque is controlled between [Te+th2low and Te+th2up]. In rotor position interval [θ1, θr/4], phase A continues to use the second set of torque thresholds, phase B continues to use the first set of torque thresholds, and the total torque is controlled between [Te+th1low and Te+th1up]. This suppresses torque ripples of a four-phase switched reluctance motor and provides great engineering application values.

A system and method for torque compensation in a switched reluctance (SR) machine disposed on a machine is disclosed. The system may comprise a SR machine, an inverter and a controller. The controller is in operable communication with the inverter and is configured to determine a commanded main current associated with energization by a main current of a first portion of the plurality of windings for a controlling phase, and determine a commanded parasitic current associated with energization by a parasitic current of a second portion of the windings in a non-controlling phase. The controller is further configured to determine an offset current based on the commanded parasitic current, and determine a target current based on a first sum of the commanded main current and the offset current, and command the inverter to actuate the target current in the first portion of the windings during the controlling phase.