Permanent Magnet Synchronous Motor Control Based on Phase Current Reconstruction

The traditional single current sensor control strategy of a permanent magnet synchronous motor (PMSM) often adopts the DC bus method, which makes it difficult to eliminate blind area reconstruction. Therefore, reconstruction method based on sliding mode observer is proposed. Based equation motor, takes α-axis and β-axis currents as observation objects shares same synovial surface, so that value converge actual at time unknown information obtained. system first tests performance under different working conditions when parameters are matched, then ability parameter mismatch. results show with matched can accurately quickly reconstruct various operating conditions, maximum error does not exceed 4 mA. When mismatched, high-performance still be achieved. proposed has excellent robustness.