US 12,255,559 B2
Sensorless induction motor system and control method thereof
Joo Yeon Kim, Seoul (KR); Chang Seok You, Gyeonggi-do (KR); Sung Do Kim, Seoul (KR); and Min Su Kang, Gyeonggi-do (KR)
Assigned to Hyundai Motor Company, Seoul (KR); and Kia Corporation, Seoul (KR)
Filed by Hyundai Motor Company, Seoul (KR); and Kia Corporation, Seoul (KR)
Filed on Oct. 31, 2022, as Appl. No. 17/977,313.
Claims priority of application No. 10-2022-0052851 (KR), filed on Apr. 28, 2022.
Prior Publication US 2023/0353074 A1, Nov. 2, 2023
Int. Cl. H02P 21/18 (2016.01); H02P 6/18 (2016.01); H02P 21/26 (2016.01)
CPC H02P 21/18 (2016.02) [H02P 21/26 (2016.02); H02P 6/18 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A sensorless induction motor system, comprising:
a motor including a stator having windings forming a plurality of phases and a rotor having a permanent magnet; and
a controller configured to:
control operation of the motor by controlling a voltage applied to each phase of the stator,
set a stop waiting time expected to be required for the rotor to stop during stop control of the motor,
apply a pulse voltage to each phase of the stator a plurality of times after the stop waiting time, and
determine that the rotor is stopped when rotor position vectors having largest induced current deviations are observed as a same rotor position vector.