US 12,231,064 B2
Method for estimating the electromagnetic torque of a synchronous electric machine
Malek Ghanes, Nantes (FR); Mohamed Hamida, Nantes (FR); Abdelmalek Maloum, Chevilly Larue (FR); and Mehdi Taherzadeh, Nantes (FR)
Assigned to AMPERE S.A.S., Boulogne-Billancourt (FR)
Appl. No. 17/760,084
Filed by RENAULT S.A.S, Boulogne-Billancourt (FR)
PCT Filed Feb. 1, 2021, PCT No. PCT/EP2021/052300
§ 371(c)(1), (2) Date Aug. 3, 2022,
PCT Pub. No. WO2021/156202, PCT Pub. Date Aug. 12, 2021.
Claims priority of application No. 2001076 (FR), filed on Feb. 4, 2020.
Prior Publication US 2023/0041799 A1, Feb. 9, 2023
Int. Cl. H02P 6/10 (2006.01); H02P 6/18 (2016.01); H02P 21/12 (2016.01); H02P 21/14 (2016.01); H02P 21/20 (2016.01)
CPC H02P 21/12 (2013.01) [H02P 21/141 (2013.01); H02P 21/20 (2016.02)] 8 Claims
OG exemplary drawing
 
1. A method for estimating an electromagnetic torque of a permanent-magnet three-phase synchronous electric machine for an electric or hybrid motor vehicle, the method comprising:
measuring currents and voltages on phases of a stator of the machine in a fixed three-phase reference system tied to the stator;
determining the currents and voltages in a fixed two-phase reference system tied to the stator as a function of the current and voltage measurements in the three-phase reference system;
calculating a first estimate of a flux of the machine by calculating an integral of an electromotive force, the electromotive force being calculated based on the voltages and currents expressed in the fixed two-phase reference system tied to the stator;
estimating the electromagnetic torque based on the flux estimated by the first estimate;
determining the currents and voltages in a rotating two-phase reference system tied to a rotor as a function of the currents and voltages expressed in the fixed two-phase reference system and a position of the rotor with respect to the stator;
calculating, in parallel, a second estimate of the flux of the machine using the currents expressed in the rotating two-phase reference system tied to the rotor, said second flux estimate being corrected by introducing variables characterizing magnetic uncertainties of the machine, said variables being determined by an observer based on the stator currents and voltages expressed in the rotating two-phase reference system tied to the rotor;
comparing the torque estimated based on the flux estimated by the first estimate and a setpoint torque; and
resetting initial conditions of the flux in line with the first estimate based on the flux estimated by the second estimate when a difference between the torque estimated based on the flux estimated by the first estimate and the setpoint torque exceeds a predefined threshold, wherein
the method further comprises deactivating the calculation of said second flux estimate when the difference between the torque estimated based on the flux estimated by the first estimate and the setpoint torque is less than or equal to the threshold.