Patent ID: 11967913
Assignee: EXRO TECHNOLOGIES INC.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 14:
15. A method of operation of a system to drive a multiphase electric machine, the multiphase electric machine having a respective plurality of coils for each phase, the system comprising a respective coil driver for each phase, for each phase of a multi-phase electric machine the method comprising:
switching the respective coil driver for each phase of the multiphase electric machine to drive the respective coils for the phase of the multiphase electric machine in one of a series mode and a parallel mode,
wherein, the series mode comprises:
driving a respective plurality of coils for each phase; and

wherein the parallel comprises:
driving each the plurality of coils for each phase with an identical current by a respective H bridge circuit,
wherein in the first mode a first and a second AC voltages have a frequency factor that is twice a drive modulation frequency of the switches.