Switched reluctance motor with reduced torque ripple
AssigneeJaguar Land Rover Limited
InventorsXavier Vinamata, Alexandros Michaelides, Philip Topping
Life of this patent
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Abstract
Aspects of the invention relate to a switched reluctance motor and the reduction of motor torque output ripple by inclusion of flux barriers. The inclusion of flux barriers running parallel to the motor shaft axis located in the appropriate places in either or the rotor and stator can modify the torque profile output of the motor markedly reducing potential vibration problems in a vehicle driveline.
Claims15
A switched reluctance motor, comprising:
- a rotor comprising a plurality of rotor teeth;
- and
- a stator comprising a plurality of stator teeth;
- wherein at least one of the rotor teeth has one or more non-continuous flux barriers separated along an axis parallel to a longitudinal axis of the at least one of the rotor teeth, wherein all of the one or more non-continuous flux barriers of the at least one of the rotor teeth are enclosed within the at least one of the rotor teeth and do not extend through to an outer surface of the at least one of the rotor teeth.
A method of controlling a switched reluctance motor, the switched reluctance motor having a rotor comprising a plurality of rotor teeth, a stator comprising a plurality of stator teeth, and wherein at least one of the rotor teeth has one or more non-continuous flux barriers separated along an axis parallel to a longitudinal axis of the at least one of the rotor teeth, wherein all of the one or more non-continuous flux barriers of the rotor teeth are enclosed within the at least one of the rotor teeth and do not extend through to an outer surface of the at least one of the rotor teeth, the method comprising:
- varying a stator winding current in any phase at a time when the one or more non-continuous flux barriers are modifying magnetic flux paths.
A method of manufacturing a switched reluctance motor, the switched reluctance motor having a rotor comprising a plurality of rotor teeth, a stator comprising a plurality of stator teeth, wherein at least one of the rotor teeth has one or more non-continuous flux barriers separated along an axis parallel to a longitudinal axis of the at least one of the rotor teeth, the method comprising:
- punching rotor laminations to create non-continuous flux barrier voids;
- and
- assembling the rotor laminations into a stack to form the rotor of the switched reluctance motor, wherein the assembling of the rotor laminations into a stack forms rotor non-continuous flux barriers, wherein the rotor non-continuous flux barriers are all enclosed within the at least one of the rotor teeth and do not extend through to an outer surface of the at least one of the rotor teeth.
Dependencies are inferred from the claim text.