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A Pulse Injection Based Sensorless Position Estimation Method for a Switched Reluctance Motor over a Wide Speed Range

Ofori, Ernest
http://rave.ohiolink.edu/etdc/view?acc_num=akron1403130339

Abstract Details

2014, Master of Science in Engineering, University of Akron, Electrical Engineering.
Effective operation of the switched reluctance motor (SRM) requires phase excitation to be appropriately synchronized with its rotor position. Generally, mechanical position sensors are directly used to provide the rotor position information. However, these sensors tend to increase the drive cost and deteriorate the reliability of the drive system. Therefore, it is desirable to have low-cost sensorless control method as an integral part of an SRM control drive. The objective of this thesis is to develop a sensorless control method for an SRM. An intrusive sensorless method, which involves high frequency pulse injections into an unexcited SRM phases for determining the rotor position over a wide speed range is developed. The developed method estimates the rotor position through analysis of the resultant current after pulse injections. Low speed intrusive sensorless method developed previously based on two thresholds has been extended to improve robustness against varying operating conditions. The developed variable pulse injection duty ratio provides invariant sensing thresholds over varying DC bus voltages. A new technique has been proposed to be able to implement pulse injection based position estimation methods at high speeds. In the proposed scheme, a single pulse is injected into the idle phase of an SRM to determine the rotor position. At low speeds, there is ample amount of time to inject series of high frequency pulses to determine the rotor position where as time for pulse injection is very short at high speeds. Only a single diagnostic pulse can be injected to determine the rotor position at high speeds. It is also very difficult to capture the peak value of the current for a single pulse operation. We proposed an algorithm that would map the rotor position to the integration of a single pulse current waveform. Integration is implemented into an analog circuitry which eliminated the difficulty in catching the peak value of the injected pulse current into idle phase. The low and high speed methods are coupled together to provide a robust wide speed sensorless control of the SRM drive. The proposed sensorless method has been simulated using Matlab-Simulink and implemented on an experimental setup in real time to validate its performance.
Yilmaz Sozer, Dr. (Advisor)
Malik Elbuluk, Dr. (Committee Member)
Tom Hartley, Dr. (Committee Member)
123 p.
Electrical Engineering

Recommended Citations

Citations

  • Ofori, E. (2014). A Pulse Injection Based Sensorless Position Estimation Method for a Switched Reluctance Motor over a Wide Speed Range [Master's thesis, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1403130339

    APA Style (7th edition)

  • Ofori, Ernest. A Pulse Injection Based Sensorless Position Estimation Method for a Switched Reluctance Motor over a Wide Speed Range. 2014. University of Akron, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1403130339.

    MLA Style (8th edition)

  • Ofori, Ernest. "A Pulse Injection Based Sensorless Position Estimation Method for a Switched Reluctance Motor over a Wide Speed Range." Master's thesis, University of Akron, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=akron1403130339

    Chicago Manual of Style (17th edition)

akron1403130339
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© 2014, all rights reserved.
This open access ETD is published by University of Akron and OhioLINK.
Release 3.2.12