Novel Strategy for BLDC Motor Rotor Position Detection

Abstract:

The detection of rotor position plays an important role in the motor speed-adjustment system. By analyzing the back-EMF method and its improved methods, we know the amplitude of back-EMF is too small to be detected when the motor run at low speed. A new detection method of rotor position has been proposed in this paper. It detects the zero crossing point of line terminal voltage difference to acquire the rotor position signal after a 90 degrees mechanical angle delay. The amplitude of line terminal voltage difference is large in wide speed range, so the rotor position signal can be accurately acquired in most situations. Simulation results proved that the new method can obtain the rotor position signal exactly in both high and low speed. It meets the wide speed range of motor.

• Periodical: Applied Mechanics and Materials (Volume 772)
• Pages: 365-372
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.772.365
• Online since: July 2015
• Authors: Ling Zhi Cao, Sheng Hao Yang
• Keywords: Brushless Dc Motor, Line Terminal Voltage Difference, Position Sensorless

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