US 11,884,341 B2
Active motor current limiting of synchronous motor drives
Prerit Pramod, Saginaw, MI (US); Krishna M P K Namburi, Okemos, MI (US); and Nakul Shah, Saginaw, MI (US)
Assigned to Steering Solutions IP Holding Corporation, Saginaw, MI (US)
Filed by Steering Solutions IP Holding Corporation, Saginaw, MI (US)
Filed on Oct. 7, 2021, as Appl. No. 17/496,206.
Claims priority of provisional application 63/088,585, filed on Oct. 7, 2020.
Prior Publication US 2022/0105978 A1, Apr. 7, 2022
Int. Cl. B62D 5/04 (2006.01)
CPC B62D 5/0463 (2013.01) [B62D 5/0409 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method of controlling operation of an electric machine, comprising:
calculating a voltage-based torque limit based on a voltage constraint of a direct current (DC) bus supplying power to an inverter for powering the electric machine;
calculating a current-based torque limit based on a motor current limit;
determining a final torque limit based on the voltage-based torque limit and the current-based torque limit;
determining a limited command torque based on a torque command and the final torque limit; and
generating at least one current command based on, at least, the limited command torque.