US 12,237,791 B2
Method and system for controlling common mode electric current in an electric machine
Brent S. Gagas, Pleasant Ridge, MI (US); Kerrie M. Spaven, Rochester Hills, MI (US); Brian J. Gallert, Lake Orion, MI (US); Daniel J. Berry, Macomb Township, MI (US); and Brian A. Welchko, Oakland Township, MI (US)
Assigned to GM Global Technology Operations LLC, Detroit, MI (US)
Filed by GM GLOBAL TECHNOLOGY OPERATIONS LLC, Detroit, MI (US)
Filed on Mar. 13, 2023, as Appl. No. 18/182,640.
Prior Publication US 2024/0313686 A1, Sep. 19, 2024
Int. Cl. H02P 27/08 (2006.01); H02P 21/00 (2016.01)
CPC H02P 27/085 (2013.01) [H02P 21/0003 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A control system for a multi-phase rotary electric machine, comprising:
an inverter configured to transfer electric energy between a rechargeable energy storage device (RESS) and the multi-phase rotary electric machine (electric machine) via a plurality of output leads;
an AC choke filter that includes an inductor that is in-line or is placed, wherein the AC choke filter is arranged proximal to the plurality of output leads;
a temperature monitor, wherein the temperature monitor is arranged to determine a temperature of the AC choke filter; and
a controller, the controller being operatively connected to the inverter and in communication with the temperature monitor;
the controller including an instruction set, the instruction set being executable to:
determine a reference temperature associated with the AC choke filter,
determine an operating point of the electric machine, and
control operation of the inverter based upon the temperature of the AC choke filter, the reference temperature, and the operating point of the electric machine.