US 11,750,127 B2
Control method for balancing scaling errors of multiple current sensors for PMSM
Zhichen Lin, Zhejiang (CN); Tingna Shi, Zhejiang (CN); Zhen Zhang, Zhejiang (CN); and Changliang Xia, Zhejiang (CN)
Assigned to ZHEJIANG UNIVERSITY ADVANCED ELECTRICAL EQUIPMENT INNOVATION CENTER, Zhejiang (CN); and ZHEJIANG UNIVERSITY, Zhejiang (CN)
Appl. No. 17/793,935
Filed by ZHEJIANG UNIVERSITY ADVANCED ELECTRICAL EQUIPMENT INNOVATION CENTER, Zhejiang (CN); and ZHEJIANG UNIVERSITY, Zhejiang (CN)
PCT Filed Aug. 3, 2021, PCT No. PCT/CN2021/110343
§ 371(c)(1), (2) Date Jul. 20, 2022,
PCT Pub. No. WO2022/262091, PCT Pub. Date Dec. 22, 2022.
Claims priority of application No. 202110670546.8 (CN), filed on Jun. 17, 2021.
Prior Publication US 2023/0163704 A1, May 25, 2023
Int. Cl. H02P 21/14 (2016.01); H02P 21/22 (2016.01); H02P 21/00 (2016.01); H02P 25/022 (2016.01); H02P 27/08 (2006.01)
CPC H02P 21/14 (2013.01) [H02P 21/0003 (2013.01); H02P 21/22 (2016.02); H02P 25/022 (2013.01); H02P 27/08 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A control method for balancing scaling errors of a plurality of current sensors for PMSM, comprising:
step 1) setting an impedance network between a direct current power supply and a three-phase inverter connected to a permanent magnet synchronous motor to avoid positive and negative poles of the direct current power supply being short-circuited under actions of shoot-through vectors;
step 2) under the actions of two shoot-through vectors in one PWM cycle of the three-phase inverter, respectively sampling a difference of currents in each branch of three-phase output branches of the three-phase inverter and a bridge arm branch of the three-phase inverter using the three-phase current sensors to obtain a sampled current of each of three phases, and then performing operations according to the sampled currents to obtain a relationship between scaling error coefficients of the three-phase current sensors;
step 3) calculating correction coefficients through the relationship between the scaling error coefficients of the three-phase current sensors, and implementing correction of scaling errors of the current sensors using a correction coefficient feedback control.