Integrated common mode choke and current sensing

A method of controlling an alternating current (AC) motor system, comprising:

• attenuating a common mode current through an AC bus with an AC choke surrounding the AC bus, the AC bus providing multi-phase AC current from a power inverter to multi-phase AC stator windings in a stator;
• determining the common mode current based upon a voltage from a coil proximate the AC choke;
• and
• adjusting one of a slew rate and a pulse width modulation of the power inverter based upon the determined common mode current.

An electrified powertrain, comprising:

• a battery pack;
• a traction power inverter module (“TPIM”) connected to the battery pack, and configured to change a direct current (“DC”) voltage from the battery pack to a multi-phase alternating current (“AC”) voltage;
• a rotary electric machine energized by the multi-phase AC voltage from the TPIM over a multi-phase AC bus, and comprising:
• a stator having multi-phase AC stator windings;
• a rotor;
• and
• a rotor shaft connected to and surrounded by the rotor, and configured to rotate about an axis of rotation in conjunction with the rotor when the rotary electric machine is energized;
• a transmission coupled to the rotor shaft and powered by the rotary electric machine;
• an AC choke surrounding the multi-phase AC bus;
• a current sensor including a coil proximate the AC choke for determining a common mode current through the AC bus;
• and
• a controller responsive to a signal from the current sensor to adjust one of a slew rate and a pulse width modulation of the TPIM based upon the determined common mode current.