Sensor less BLDC Motor Control with Back EMF Zero Crossing Detection using PIC 18F2431 MCU
Kushal G. Dhawad

Kushal G. Dhawad, Assistant Professor, Department of Electrical Engineering, Lokmanya Tilak College of Engineering, Koperkhairne, Navi Mumbai (Maharashtra). India.
Manuscript received on June 12, 2016. | Revised Manuscript received on June 17, 2016. | Manuscript published on June 25, 2016. | PP: 6-9 | Volume-4 Issue-5, June 2016. | Retrieval Number: E1102054516
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Abstract: From Mid 19th Century Brushless Direct Current (BLDC) motors are one of the motor types that are rapidly gaining popularity. These motors are being utilized in many of the industrial, commercial appliances such as in Automotive, Aerospace, Medical Instruments, Industrial automation equipment’s & Instrumentation. These motors do not use brushes for commutation; instead, they are electronically commuted which is having complex control circuitry. For this electronic sensor circuits like Hall Effect sensor & Rotary encoders were used to directly measure the rotor’s position. But with Sensorless control a BLDC motor calls for commutation based on the Back-EMF which is produced in the stator windings. Sensorless control has two distinct advantages: 1. Lower system cost & 2. Increased reliability. Hall Effect sensors are not required for this type of control of BLDC motors.
Keywords: Sensorless BLDC motor control, BLDC motor, 3-phase bridge inverter circuit, IGBT driver.