RC Filter Free Flux-based Sensorless BLDC Drive for Permanent Magnet Motor using Pulse Amplitude Modulation
Journal
2022 IEEE Energy Conversion Congress and Exposition, ECCE 2022
ISBN
9781728193878
Date Issued
2022-01-01
Author(s)
Abstract
This paper proposes a novel flux-based sensorless BLDC drive position estimation using terminal phase voltage sensors without additional RC filters. Conventional sensorless BLDC drive estimates the rotor position through the zero-crossing point (ZCP) detection of electromotive force (EMF) voltage. Due to the pulse width modulation (PWM) control and inverter diode commutation, RC filters are added to remove additional voltage harmonics for the EMF ZCP detection. However, RC filters result in voltage phase and gain distortion, leading to the drive degradation at both low and high speed. In this paper, RC filters are eliminated by the pulse amplitude modulation (PAM) BLDC drive. Besides, the diode commutation reflected voltage spike can be compensated based on the flux estimation with phase voltage integration. This filter free flux-based sensorless BLDC drive directly measures phase voltages for position estimation. Without the influence of RC filter, the proposed sensorless drive is suited for high dynamic performance at full speed region. A 320W permanent magnet (PM) motor is used for experimental verification of the proposed filter free flux-based sensorless BLDC drive.
Subjects
Brushless DC motor | flux estimation | position sensorless drive | pulse amplitude modulation
SDGs
Type
conference paper