A device has a plurality of power converter groups and a control system. A power converter group has a group of power converters and is coupled between an input voltage source and a group of windings of a motor generator. The control system is configured to control currents of the windings such that the number of poles of and the number of phases in a pair of poles of the motor/generator are dynamically adjusted, and the number of poles and the strength of a magnetic field of the motor generator are controlled to reduce a power loss. The motor/generator has an air gap and a stator with a plurality of slots, where the windings are installed in. The windings are configured such that the number of poles and the number of phases in a pair of poles of the motor/generator can be dynamically adjusted.

A device has a plurality of power converter groups and a control system. A power converter group has a group of power converters and is coupled between an input voltage source and a group of windings of a motor generator. The control system is configured to control currents of the windings such that the number of poles of and the number of phases in a pair of poles of the motor/generator are dynamically adjusted, and the number of poles and the strength of a magnetic field of the motor generator are controlled to reduce a power loss. The motor/generator has an air gap and a stator with a plurality of slots, where the windings are installed in. The windings are configured such that the number of poles and the number of phases in a pair of poles of the motor/generator can be dynamically adjusted.

In a rotary electric machine, a rotor, and a stator. The stator includes slots provided in a circumferential direction thereof, and stator windings wound in the slots. The stator windings include n groups of three-phase windings, where n is a power of 2. The slots include first slots each accommodating portions of same-group and same-phase windings in the n groups of three-phase windings. The energizing directions of the same-group and same-phase windings are identical to each other. The second slots each accommodate different-group and same-phase windings in the n groups of three-phase windings. The first slots and the second slots are arranged in the stator at predetermined intervals in a circumferential direction of the stator, and the three-phase windings of each group are wound around the stator with regular intervals therebetween.

In a rotary electric machine, a rotor, and a stator. The stator includes slots provided in a circumferential direction thereof, and stator windings wound in the slots. The stator windings include n groups of three-phase windings, where n is a power of 2. The slots include first slots each accommodating portions of same-group and same-phase windings in the n groups of three-phase windings. The energizing directions of the same-group and same-phase windings are identical to each other. The second slots each accommodate different-group and same-phase windings in the n groups of three-phase windings. The first slots and the second slots are arranged in the stator at predetermined intervals in a circumferential direction of the stator, and the three-phase windings of each group are wound around the stator with regular intervals therebetween.

A motor control method comprises detecting operating parameters of a motor system comprising a plurality of windings, a rotor, a stator magnetically coupled to the rotor and a plurality of power converters connected to the plurality of windings, determining, by a controller, a suitable pole number and a preliminary set of operating variables based upon the operating parameters, reducing operating stresses of the motor system gradually and after reducing the operating stresses, configuring the plurality of power converters so as to adjust the number of poles of the motor system according to the suitable pole number.

A motor control method comprises detecting operating parameters of a motor system comprising a plurality of windings, a rotor, a stator magnetically coupled to the rotor and a plurality of power converters connected to the plurality of windings, determining, by a controller, a suitable pole number and a preliminary set of operating variables based upon the operating parameters, reducing operating stresses of the motor system gradually and after reducing the operating stresses, configuring the plurality of power converters so as to adjust the number of poles of the motor system according to the suitable pole number.

A motor control method comprises providing a machine comprising a plurality of windings, a rotor and a stator magnetically coupled to the rotor, coupling a plurality of power converters to the plurality of windings, configuring the plurality of power converters so as to adjust the number of poles of the machine in a low-stress operating mode according to a plurality of operating parameters and after a fault occurs in the machine, configuring the plurality of power converters such that the machine enters a fault tolerant operating mode.

A motor control method comprises providing a machine comprising a plurality of windings, a rotor and a stator magnetically coupled to the rotor, coupling a plurality of power converters to the plurality of windings, configuring the plurality of power converters so as to adjust the number of poles of the machine in a low-stress operating mode according to a plurality of operating parameters and after a fault occurs in the machine, configuring the plurality of power converters such that the machine enters a fault tolerant operating mode.

A motor control method includes providing a motor comprising a plurality of windings, a rotor and a stator magnetically coupled to the rotor, coupling a plurality of power converters to the plurality of windings, configuring the plurality of power converters to operate in a first interleaving mode, controlling the plurality of power converters to dynamically adjust the number of poles of the motor and after the step of controlling the plurality of power converters to dynamically adjust the number of poles of the motor, configuring the plurality of power converters to leave the first interleaving mode and enter into a second interleaving mode.

A motor control method includes providing a motor comprising a plurality of windings, a rotor and a stator magnetically coupled to the rotor, coupling a plurality of power converters to the plurality of windings, configuring the plurality of power converters to operate in a first interleaving mode, controlling the plurality of power converters to dynamically adjust the number of poles of the motor and after the step of controlling the plurality of power converters to dynamically adjust the number of poles of the motor, configuring the plurality of power converters to leave the first interleaving mode and enter into a second interleaving mode.