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Analyses, Simulation and Introduction of a New PWM Algorithm for Sensor Less Control of Brushless DC (BLDC) Motors

Aghajani Tularud, Afshin | 2009

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 40148 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Oraee Mirzamani, Hashem
  7. Abstract:
  8. Brushless DC (BLDC) motors and their drives are penetrating the market of home appliances, HVAC industry, and automotive applications in recent years because of their high efficiency, silent operation, compact form, reliability, and low maintenance. Traditionally, BLDC motors are commutated in six-step pattern with commutation control by position sensors. To reduce cost and complexity of the drive system, sensorless drive is preferred. In BLDC motors, stator winding is energized with appropriate sequencing. The sequence of energizing is determined by rotor position and rotor position is detected by the phase back EMF (BEMF). Motor is energized using an inverter which is controlled by PWM technique. The PWM sequence is crucial for the startup and control of BLDC motors. Zero crossing of BEMF presented a window for PWM sequence. In this thesis, by the analysis and simulation of a BLDC motor and applying several types of PWM modes, an optimized algorithm for the sequence of PWM in BLDC motor is introduced. This algorithm provides considerable reliability and stability for control system. In addition, the proposed algorithm minimizes phase current ripple and torque vibration of the motor
  9. Keywords:
  10. Sensorless Speed Control ; Hall Effect ; Pulse Width Modulation (PWM) ; Brushless Direct Current (BLDC)Motor ; Back Electromotive Force (BEMF)

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