Control method for reducing torque ripple in an electrical machine
AssigneeGeneral Electric Company
InventorDavid Allan Torrey
Life of this patent
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Abstract
A method of controlling torque ripple in an electrical machine that includes a field winding for creating nominally constant field current using DC current and an armature winding for creating a rotating magnetic field using AC current, calls for superimposing a spatially varying current component on to the DC current of the field winding. Other methods are also disclosed that are suitable for electrical machines that have a winding that is excited with nominal DC current including SRMs, FSMs, and wound-field synchronous motors.
Claims22
A method of controlling torque ripple in an electrical machine, the method comprising:
- splitting each phase winding of an electrical machine into an AC winding and a DC winding;
- exciting the AC winding of each phase winding with symmetrically displaced sinusoidal currents;
- and
- exciting the DC winding of all phase windings with a varying DC current based on spatially varying magnetic properties of the electrical machine.
A method of controlling torque ripple in an electrical machine, wherein the electrical machine includes a field winding for creating nominally constant field current using DC current and an armature winding for creating a rotating magnetic field using AC current, the method comprising:
- superimposing a spatially varying current component on to the DC current of the field winding, thereby reducing torque ripple in the electrical machine.
A method of controlling torque ripple in an electrical machine, the method comprising:
- splitting each phase winding of an electrical machine into an AC winding and a DC winding;
- exciting the DC winding of all phase windings with a varying DC current based on spatially varying magnetic properties of the electrical machine;
- and
- exciting the AC winding of each phase winding with symmetrically displaced sinusoidal currents that vary in response to a rotor position.
Dependencies are inferred from the claim text.