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A Study of Control Systems of Brushless DC Motors

Mohammed, Omar
http://rave.ohiolink.edu/etdc/view?acc_num=toledo1399046747

Abstract Details

2014, Master of Science, University of Toledo, Electrical Engineering.
Brushless DC (BLDC) are replacing DC motors in wide range of applications such as household appliances, automotive and aviation. These applications require a very robust, high power density and efficient motor for operation. BLDCs are commutated electronically unlike the DC motor. BLDCs are controlled using a microcontroller which powers a three phase power semiconductor bridge. This semiconductor bridge provides power to the stator windings based on the control algorithm. The motor is electronically commutated, and the control technique/ algorithm required for commutation can be achieved either by using a sensor or a sensorless approach. To achieve the desired level of performance the motor also can be controlled using a velocity feedback loop. Sensorless control techniques such as Direct Back Electromotive Force (Back- EMF), Indirect Back EMF Integration and Field Oriented Control (FOC) are studied and discussed. To achieve a desired level of performance in various applications that require the motor to operate at constant speed over various loads, the motor has to be operated using a suitable velocity control loop. These types of controllers are achieved by using a conventional proportional- integral (PI) controller. The speed vs. torque characteristics of several different sensorless control techniques of BLDCs were studied and compared to the speed vs. torque curve of a separately excited DC motor. The speed vs. torque characteristic of a BLDC using a PI controller is also discussed.
Thomas Stuart (Committee Chair)
Mansoor Alam (Committee Member)
Richard Molyet (Committee Member)
Electrical Engineering

Recommended Citations

Citations

  • Mohammed, O. (2014). A Study of Control Systems of Brushless DC Motors [Master's thesis, University of Toledo]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1399046747

    APA Style (7th edition)

  • Mohammed, Omar . A Study of Control Systems of Brushless DC Motors. 2014. University of Toledo, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=toledo1399046747.

    MLA Style (8th edition)

  • Mohammed, Omar . "A Study of Control Systems of Brushless DC Motors." Master's thesis, University of Toledo, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1399046747

    Chicago Manual of Style (17th edition)

toledo1399046747
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© 2014, some rights reserved.Creative Commons License A Study of Control Systems of Brushless DC Motors by Omar Mohammed is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License. Based on a work at etd.ohiolink.edu.
This open access ETD is published by University of Toledo and OhioLINK.
Release 3.2.12