Current Decoupling Control for Interior Permanent Magnet Synchronous Motor

In this paper, a decoupling control method based on improved proportional regulator and enhanced extended state observer (IP-EESO) for interior permanent magnet synchronous motor (IPMSM) used in electric vehicles is proposed. The coupling problem between the two-input and two-output systems is treated as an anti-disturbance problem of the single-input and single-output system, with the coupling term considered as the disturbance quantity for observation. Improvements are made from two aspects: the structure of the extended state observer and model compensation. This achieves complete decoupling of the interior permanent magnet synchronous motor. Compared with the traditional current feedback decoupling control, the proposed decoupling method reduces the current regulation time when inductance parameters do not match. Furthermore, compared to the traditional decoupling method based on the proportional regulator and extended state observer (P-ESO), the proposed decoupling control method achieves complete decoupling even under torque or speed slope changes, with shorter adjustment times during abrupt torque changes. The proposed method is tested on a 60 kW interior permanent magnet synchronous motor, and the results verify its feasibility and effectiveness.