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; exciting the DC winding of all phase windings with a varying DC current based on spatially varying magnetic properties of the electrical machine; and calculating the spatially varying magnetic properties of the electrical machine, wherein the spatially varying magnetic properties of the electrical machine are represented as
f(δ)=1+k3[sin(3δ+γ)+tan(γ)cos(3δ+γ)]+k6[sin(6δ+γ)+tan(γ)cos(6δ+γ)],wherein δ is angular degrees (position), k3 and k6 are constants, and γ is a phase angle.