A study on high frequency signal injection method of aiming at detecting the rotor position of the salient-pole brushless DC motor

The rotor position detection without sensor is very important for permanent magnet brushless DC motor (PM-BLDCM) to fulfil its electric commutation and speed control, a novel rotor position detection method, based on the spatial saliency tracking scheme was presented. The method employed high-frequency voltage-signal injection to make motor form a high-frequency current vector, of which the negative component current contained rotor position information. By rotor position tracking observer, with heterodyning processing adopted, the rotor position signal can be picked up and then the detection of the rotor position can be implemented without any specialized mechanical position sensor. The sensing principle of the spatial saliency tracking scheme, the principal of space voltage PWM (SVPWM) technology to inject the high-frequency signal, the structure of the rotor position tracking observer and the simulation study for the rotor position self-sensing process of a PM-BLDCM at low even zero speed and normal operation were all discussed in detail. Simulation results verified the correctness and availableness of this approach.

[1]  M. J. Corley,et al.  Rotor position and velocity estimation for a permanent magnet synchronous machine at standstill and high speeds , 1996, IAS '96. Conference Record of the 1996 IEEE Industry Applications Conference Thirty-First IAS Annual Meeting.

[2]  Robert D. Lorenz,et al.  Rotor position estimation for permanent magnet synchronous motor using saliency-tracking self-sensing method , 2000, Conference Record of the 2000 IEEE Industry Applications Conference. Thirty-Fifth IAS Annual Meeting and World Conference on Industrial Applications of Electrical Energy (Cat. No.00CH37129).

[3]  Robert D. Lorenz,et al.  Transducerless field orientation concepts employing saturation-induced saliencies in induction machines , 1995, IAS '95. Conference Record of the 1995 IEEE Industry Applications Conference Thirtieth IAS Annual Meeting.

[4]  Robert D. Lorenz,et al.  Using multiple saliencies for the estimation of flux, position, and velocity in AC machines , 1997 .

[5]  Hiroshi Watanabe,et al.  A mechanical sensorless control system for salient-pole brushless DC motor with autocalibration of estimated position angles , 2000, IEEE Trans. Ind. Electron..

[6]  Jung-Ik Ha,et al.  Sensorless field orientation control of an induction machine by high frequency signal injection , 1997, IAS '97. Conference Record of the 1997 IEEE Industry Applications Conference Thirty-Second IAS Annual Meeting.

[7]  V. Blasko,et al.  Analysis of a hybrid PWM based on modified space vector and triangle comparison methods , 1996, IAS '96. Conference Record of the 1996 IEEE Industry Applications Conference Thirty-First IAS Annual Meeting.

[8]  R. Lorenz,et al.  Sensorless control of interior permanent magnet machine drives with zero-phase-lag position estimation , 2002 .

[9]  Robert D. Lorenz,et al.  Measuring, modeling and decoupling of saturation-induced saliencies in carrier signal injection-based sensorless AC drives , 2000, Conference Record of the 2000 IEEE Industry Applications Conference. Thirty-Fifth IAS Annual Meeting and World Conference on Industrial Applications of Electrical Energy (Cat. No.00CH37129).

[10]  R D Lorenz.  OBSERVERS AND STATE FILTERS IN DRIVES AND POWER ELECTRONICS , 2002 .

[11]  N. Kasa,et al.  A sensorless position control system by salient-pole brushless DC motor , 1997, Proceedings of the IECON'97 23rd International Conference on Industrial Electronics, Control, and Instrumentation (Cat. No.97CH36066).

[12]  Seung-Ki Sul,et al.  A new overmodulation strategy for induction motor drive using space vector PWM , 1995, Proceedings of 1995 IEEE Applied Power Electronics Conference and Exposition - APEC'95.