Position Sensorless Control for Four-Switch Three-Phase Brushless DC Motor Drives

Abstract

This paper proposes a position sensorless control scheme for four-switch three-phase (FSTP) brushless dc (BLDC) motor drives using a field programmable gate array (FPGA). A novel sensorless control with six commutation modes and novel pulsewidth modulation scheme is developed to drive FSTP BLDC motors. The low cost BLDC driver is achieved by the reduction of switch device count, cost down of control, and saving of hall sensors. The feasibility of the proposed sensorless control for FSTP BLDC motor drives is demonstrated by analysis and experimental results. Index Terms-Brushless dc (BLDC) motor, four-switch threephase (FSTP) inverter, field programmable gate array (FPGA), sensorless control.

A Novel Space Vector modulation Scheme and Direct Torque Control for Four-switch BLDCM Using Flux Observer

“…The DTC method controls instantaneous torque and flux to achieve high-performance operation [11][12][13]. For this purpose, an optimized switching table must be defined based on the output states of the instantaneous stator flux magnitude hysteresis controller and the electromagnetic torque hysteresis controller, together with the equivalent sector, in which instantaneous stator flux space vector is located [14,15].…”

Sensorless Control of PMSM by a Four-Switch Inverter with Compensation of Voltage Distortion and Adjustment of Position Estimation Gain

“…Sensors and power switches are relatively expensive, so that cost-effective driving schemes have been widely researched [1][2][3]. In order to reduce total number of power switches, the B4 topology that uses only 4 switches instead of six switches (B6 topology) was introduced [1].…”

“…This paper focuses on the back-EMF based scheme for sensorless position detection because for using the scheme in consumer electronics. The sensorless control schemes with a B4 inverter has been reported in several papers [3,[16][17]. The schemes in [3,16] are for twophase conduction method, and the method presented in [17] by a Kalman filter is relatively complex.…”

Improved Performance of Four Switch Three Phase with SEPIC-Based Inverter

“…This forces the current of the third phase to flow through the DC-link capacitors, hence a fluctuation will predictably seem in the two capacitors' voltages, which correspondingly changes the output voltage [4]. Additionally, if the DC-link split-capacitors have not equal values, there is a opportunity of over-modulation of the pulse-width modulation process in order to compensate this difficulty [5].…”