CONTROL METHOD FOR REDUCING TORQUE RIPPLE IN AN ELECTRICAL MACHINE

摘要

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.

主权项

1. 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.