Abstract In order to solve the torque ripple problem caused by the drift of the zero point of current of permanent magnet synchronous motor used for electric power steering (EPS) system when it is online, a method for regulating offset error of current sensor, zero speed zero torque compensation method by phase voltage estimation, was proposed. This method was on the basis of quantitative analysis for the influence current zero drift on output torque of permanent magnet synchronous motor and operation characteristic of EPS system. It is can be used to on-line calibrate and adjust torque ripple caused by zero drift, which contribute to alleviate driving burden and improve operating comfort. Zero speed zero torque physical model of PMSM in EPS system was established. For this, theoretical analysis, simulation modeling and prototype test was adopted. Estimation phase voltage by PWM duty method was applied to compensate the offset error of current sensor and eliminated zero error without any additional sensor. The simulation and experiment results showed that the proposed method is feasible in engineering and implementation for reducing the torque ripple of EPS system permanent magnet synchronous motor.
Yuan Chenhu,Wang Sui,Liu Xiaoming等. On Line Calibration Strategy and Regulation Implementation of EPS System Current Sensor Zero Error Based on PMSM[J]. Transactions of China Electrotechnical Society, 2018, 33(15): 3635-3643.
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2018, Vol. 33 
