US 11,811,343 B2
Magnetic flux estimate
Al Kassem Jebai, Vernon (FR); Thomas Devos, Carrières sous Poissy (FR); and François Malrait, Jouy sur Eure (FR)
Assigned to Schneider Toshiba Inverter Europe SAS, Pacy sur Eure (FR)
Filed by Schneider Toshiba Inverter Europe SAS, Pacy sur Eure (FR)
Filed on Aug. 27, 2021, as Appl. No. 17/458,731.
Claims priority of application No. 20305981 (EP), filed on Sep. 4, 2020.
Prior Publication US 2022/0077801 A1, Mar. 10, 2022
Int. Cl. H02P 23/14 (2006.01)
CPC H02P 23/14 (2013.01) [H02P 2207/05 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A method for controlling a synchronous motor using a variable speed drive, the motor comprising a permanent magnet rotor generating a magnetic flux, the method comprising:
when the motor is at rest, applying a predefined electrical command signal to the motor;
estimating a motor speed in response to the applying of the predefined electrical command signal;
iteratively adapting a value of the predefined electrical command signal as a function of an updated motor speed estimation at least until reaching a desired estimated motor speed that indicates that the motor is operating in a stable manner;
waiting from when the predefined electrical command signal is applied when the motor is still at rest until reaching the desired estimated motor speed;
in response to reaching the desired estimated motor speed, estimating a parameter related to the magnetic flux of the permanent magnet rotor, wherein the parameter is the magnetic flux of the permanent magnet rotor;
recording the estimated parameter; and
taking the recorded estimated parameter into account for driving the synchronous motor.