Electric machine
AssigneeGeneral Electric Company
InventorsFrancesco Papini, Mohamed Osama, Anoop Kumar Jassal
Life of this patent
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Abstract
An electric machine includes a stator and a rotor operable with the stator. The rotor includes at least one pole section, the pole section defining a direct axis in a flux barrier having a first end and a second end. Each of the first and second ends are positioned proximate to the stator. The first end defines a first angular position relative to the direct axis and the second end defines a second angular position relative to the direct axis. The first angular position is different in magnitude than the second angular position to reduce a torque ripple or torque oscillation of the electric machine.
Claims19
An electric machine comprising:
- a stator;
- and
- a rotor operable with the stator and including a pole section, the pole section defining a direct axis and a flux barrier including a first end and a second end, the first end of the flux barrier positioned proximate the stator and defining a first angular position relative to the direct axis, the second end positioned proximate the stator and defining a second angular position relative to the direct axis, the first angular position being different in magnitude than the second angular position;
- wherein the flux barrier defined by the pole section of the rotor is an outer flux barrier, and wherein the pole section of the rotor further defines an inner flux barrier with the outer flux barrier nested within the inner flux barrier, wherein the inner flux barrier is asymmetric about the direct axis.
A synchronous electric machine comprising:
- a stator;
- and
- a rotor operable with the stator and comprising
- a first pole section defining a first direct axis and a first flux barrier, the first flux barrier including a first end defining a first angular position and a second end defining a second angular position, the first angular position of the first end of the first flux barrier being equal in magnitude to the second angular position of the second end of the first flux barrier;
- and
- a second pole section defining a second direct axis and a second flux barrier, the second flux barrier including a first end defining a first angular position and a second end defining a second angular position, the first angular position of the first end of the second flux barrier being different in magnitude than the second angular position of the second end of the second flux barrier;
- wherein the first flux barrier defined by the first pole section is an outer flux barrier, and wherein the first pole section further defines an inner flux barrier with the outer flux barrier nested within the inner flux barrier, wherein the inner flux barrier is asymmetric about the direct axis.
Dependencies are inferred from the claim text.