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Optimization of BLDC Motor Drivers with Electric Bicycle Application

Bahrami, Mansour | 2018

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 50499 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Mokhtari, Hossein
  7. Abstract:
  8. Electric motors used in electrical vehicles are varied, but in light electric vehicles such as electric motors and electric bikes, with limited space, permanent magnet motors due to their high power density and efficiency are very useful. These motors are divided into two types: trapezoidal and sinusoidal due to the waveform of the Back EMF voltage. The trapezoidal type, also known as the brushless DC motor , is more commonly used in light electric vehicles due to the simplicity of the control system and the lower cost. The control system of the BLDC motor is very important in its performance. Providing a controller for these engines that at low cost improves their performance is considered in this thesis. In this thesis, various methods for controlling BLDC motors, including 6-step, SVPWM , and SPWM methods, and the proposed TPWM method are used. Comparing these methods suggests that the SVPWM and TPWM methods can improve motor performance. In this thesis, a power factor correction system is proposed for the above mentioned methods, which increases the speed and efficiency of the system. In the other part of this thesis, an energy regeneration method for BLDC motors based on the conversion of the motor controller system to two simultaneous boost converters and using the TPWM switching method is proposed. In this proposed method, the amount of recovered energy is far more than the previous ones
  9. Keywords:
  10. Energy Regeneration ; Space Vector Pulse Width Modulation (SVPWM)Switching Method ; Brushless Direct Current (BLDC)Motor ; Pulse Width Modulation (PWM) ; Sinusoidal Control ; Regenerative Brake ; Sinusoidal Pulse Width Modulation (SPWM)

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