Speed control of robust position sensor less PMBLDC motor by Fuzzy controller

Department of EEE, GRIET, Hyderabad, Telangana, India

^* Corresponding author: vinaykumaar.a@gmail.com

Abstract

The aim of this work is to present a novel mechanical sensor-less control approach for permanent magnet brushless DC (PMBLDC) motors based on speed independent H functions. The starting of the motor and driving it from a low speed to the rated speed are two significant problems in sensor-less operation of PMBLDC motor drives. The commutation moment is determined using a speed-independent H function. Since the commutation instant is speed independent, it may be anticipated even at low speeds. The H function is entirely dependent online voltages, which simplifies and reduces the cost of the whole system. The suggested approach eliminates the need for analogue filtering and phase correction. Digital low pass filters and digital phase compensators are used to remove commutation ripple from line voltages. This results in a system that is small, simple to use, and cost effective. This economical option is ideal for low-cost equipment such as fans, air conditioners, refrigerators, and vacuum cleaners. The suggested method is implemented using a fuzzy controller to demonstrate the proposed sensor-less technique’s efficacy for wide speed variations.