A Position-Sensorless IPM Motor Drive System Using a Position Estimation Based on Magnetic Saliency

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  • 突極性に基づく位置推定法を用いた位置センサレスIPMモータ駆動システム
  • トツキョクセイニモトズクイチスイテイホウオモチイタイチセンサレスIPMモータク

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Abstract

This paper describes position-sensorless control of an interior permanent magnet synchronous motor (IPM motor), which is characterized by real-time position estimation based on magnetic saliency. The real-time estimation argorithm proposed in this paper determines the inductance matrix including rotor position information from current harmonics produced by switching operations of an inverter driving the IPM motor, and then estimates the rotor position every period of pulse-width modulation (PWM). Position estimation without any special signal injection is achieved with a satisfactory response and accuracy even at a standstill and at low speed. An experimental system consisting of an IPM motor and a voltage-source PWM inverter has been implemented and tested to confirm the effectiveness and versatility of the approach. Some experimental results show that the experimental system has the function of electrically locking the loaded motor, along with a position response of 20rad/s and a settling time of 300ms.

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