Minimizing dc-link current ripple and acoustic noise, and reducing DC-link capacitor requirement, for electric motors

A method performed by a controller of a switched reluctance motor, the method comprising a step of interleaved fixed switching frequency predictive current control including

• a phase shift (δAB) between carrier signals of upper switches in a Phase A and a Phase B being kept at 180° to implement an interleaving strategy when an operating region of the switched reluctance motor is the Phase A and Phase B region;
• a phase shift (δBC) between the carrier signals of the upper switches in the Phase B and a Phase C being kept at 180° to implement an interleaving strategy when the operating region of the switched reluctance motor is the Phase B and Phase C region;
• and
• a phase shift (δCA) between the carrier signals of the upper switches in the Phase C and the Phase A being kept at 180° to implement an interleaving strategy when the operating region of the switched reluctance motor is the Phase C and Phase A region.

A method performed by a controller of an electric motor, the method comprising a step of mode shape selection including

• calculating spatial and temporal distribution of airgap force during dynamic simulations through a lookup table;
• performing 1D (spatial)-FFT to identify a dominant spatial order of the airgap force;
• determining temporal orders associated with the dominant spatial order, wherein the temporal order include Mode 0 and Mode 6;
• feeding the temporal orders through a proportional integral (PI) controller into a reference current generation;
• and
• optimizing gains of the PI controller through a multi-physics vibration synthesis.