A Novel Sensor-less PMSM Drive Employing Chaos-based High-Frequency Square-Wave Voltage Injection Scheme

A novel chaotic modulation scheme of injection frequency is proposed to overcome the challenges of acoustic noise and electromagnetic interference facing traditional sensorless permanent magnet synchronous motor (PMSM) drives based on the high-frequency square wave (HFSW) injection method. The novelty of this scheme lies in the application of chaotic modulation strategy on both HFSW injection and inverter switching. The PWM technology based on chaotic modulation can significantly reduce the harmonic peak caused by traditional HFSW injection while ensuring the continuity of the power spectrum of the motor current, thus effectively solving the problem of acoustic noise and electromagnetic interference. Experimental results show that this strategy has excellent harmonic suppression capability and inherits good steady-state and dynamic performance of the traditional HFSW injection method.