Full-Region Sensorless BLDC Drive for Permanent Magnet Motor using Pulse Amplitude Modulation with DC Current Sensing
Journal
IEEE Transactions on Industrial Electronics
Date Issued
2020
Author(s)
Abstract
This paper improves the sensorless brushless DC (BLDC) motor drives using the pulse amplitude modulation (PAM) with DC current sensing. Comparing to conventional BLDC drives using pulse width modulation (PWM), PAM BLDC drives result in better drive efficiency especially at low speed. However due to six-step commutation, additional position detection issues are resultant for sensorless operation. They consist of voltage spike at low speed and commutation delay at high speed. In this paper, these BLDC position detection issues are improved based on the proposed continuous position estimation. At low speed, the commutation compensation with DC current sensing is developed to minimize the influence of voltage spike. At high speed, several voltage compensation schemes are applied to improve the commutation delay and maximizing high speed operation region. A 320W permanent magnet (PM) motor prototype is used for the experimental verification of proposed PAM BLDC drive. Comparing to conventional BLDC drives, the PAM drive with proposed positon estimation demonstrates the improvement on both low speed dynamic response and high speed steady state stability. IEEE
Subjects
Amplitude modulation; Drives; Electric motors; Permanent magnets; Pulse amplitude modulation; Pulse width modulation; Speed; Voltage control; Brushless dc motor drives; Experimental verification; High-speed operation; Permanent magnet motor; Pulse amplitude modulations (PAM); Sensorless BLDC drives; Sensorless operation; Steady state stability; Brushless DC motors
SDGs
Type
journal article