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 |
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.
|