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POSITION SENSORLESS CONTROL OF NON-SALIENT PERMANENT MAGNET SYNCHRONOUS MACHINE

Chretien, Ludovic

Abstract Details

2006, Master of Science, University of Akron, Electrical Engineering.
Permanent Magnet Synchronous Machines (PMSM) are being increasingly used because of their advantages over other machines, which include compactness, high efficiency, and well developed drives. The control of sinusoidal PMSM is usually done in the synchronous frame, which requires the knowledge of the rotor position. The sensing of the position is done through optical encoders or synchro-resolvers that increases the cost of the drive and decreases the overall reliability of the system. The substitution of the position sensors by advanced algorithms embedded in the controls hardware and software has been investigated for the last couple of decades. This thesis presents a review of the most common position estimators, and a comparison has been made to determine which one is the best candidate for implementation in industrial applications. The sensorless method relying on back-EMF estimation has been found to be the most promising, and hence, is further investigated in detail. The sensorless drive is studied through simulations, from low speed to very high speed at different torque levels. Then, very low speed and starting of the PMSM is studied, and a non-intrusive method to select the direction of rotation is proposed, given some assumptions about the load. The sensorless starting and operation have been verified experimentally using a digital signal processor implementation. A solution to achieve speed reversal and four-quadrant operation has also been proposed. Finally, a sensitivity analysis of the impact of the position estimation error on the machine torque is presented. The implementation and associated analysis prove that the selected algorithm is highly suitable for position sensorless PMSM drives coupled to passive loads, with a decrease of less than 0.8% in the output torque compared to drives using a position encoder.
Iqbal Husain (Advisor)

Recommended Citations

Citations

  • Chretien, L. (2006). POSITION SENSORLESS CONTROL OF NON-SALIENT PERMANENT MAGNET SYNCHRONOUS MACHINE [Master's thesis, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1145286531

    APA Style (7th edition)

  • Chretien, Ludovic. POSITION SENSORLESS CONTROL OF NON-SALIENT PERMANENT MAGNET SYNCHRONOUS MACHINE. 2006. University of Akron, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1145286531.

    MLA Style (8th edition)

  • Chretien, Ludovic. "POSITION SENSORLESS CONTROL OF NON-SALIENT PERMANENT MAGNET SYNCHRONOUS MACHINE." Master's thesis, University of Akron, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=akron1145286531

    Chicago Manual of Style (17th edition)