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Sensorless zero back EMF method for in rotor position control of BLDC motor drive

Author Affiliations

  • 1Electrical Engg. Department, BIT Durg, Chhattisgarh, India
  • 2EEE Department, BIT Durg, Chhattisgarh, India

Res. J. Engineering Sci., Volume 6, Issue (7), Pages 14-19, August,26 (2017)


Electrical Drives is a system comprising various devices which aim at controlling the motion of electrical machines in desired fashion. Using the concept of drive speed of rotation of an electrical machine can be controlled precisely in an optimized manner. A motor drive usually consists of an electric machine along with a power converter with associated controller. The converter manages power flow from source to the motor input terminals. Recently, there has been tremendous advancement in semiconductor technology owing to which very robust, reliable, efficient and compact AC and DC electric motor drives have been designed and developed. The controller handles the command signals and various sensor feedback signals and enables generation of appropriate gate switching signals, according to a control algorithm for the power converter. Also, the algorithm may incorporate fault detection and protection. The signals from the sensor may be machine inverter temperature outputs, rotor position of motor, currents in all phases and inverter bus voltage. Some of the Key features namely, high reliability, straight forward control, and low friction make the brushless direct current (BLDC) motors suitable for the drive applications. A BLDC motor has a better high-speed adjusting performance and power density in comparison to PMSM. According to review of relevant research work the most popular method for determining rotor position of BLDC motor is Hall Sensor method and other methods are also available viz., Variable Reluctance Method, Accelerometer, Zero Back EMF method and six step commutation control method that work well for BLDC motor. The problem of designing drive system is still one of the ubiquitous research problems.


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