Speed sensorless PMSM motor drive system based on four-switch three-phase converter

Abstract

This paper proposes a speed sensorless control for PMSM motor drive system. The sensorless strategy is based on back-emf estimation of the motor, suited for applications at high speed. The drive system uses a four-switches three-phase inverter. This topology is attractive specially in fault conditions in one leg of the conventional three-phase converter. The speed sensorless vector control based on the proposed converter provides a motor drive system with reduction of cost and volume. Relevant characteristics of the converter is presented, such as: voltage capability, capacitor currents, PWM modulation. Details of the vector control implemented is addressed. Simulation results are shown and validates the proposed system. The proposed method are under implementation in an industrial converter.

Position Estimation at Zero Speed for PMSMs Using Artificial Neural Networks

“…A technical feature of a typical PMSM drive, i.e., the need to use a shaft position sensor, whose value is required in vector control for conversion between coordinate systems and may be used for determining speed, can be considered as a disadvantage. The elimination of the mechanical sensor for determining the shaft position is a subject of research still being developed in various research centers [9][10][11][12][13][14][15][16] and will allow vector control without the need for a position sensor. This will increase the reliability of the drive, reduce its costs, and increase its compactness.…”

Low-Cost Position Sensorless Speed Control of PMSM Drive Using Four-Switch Inverter

“…[22][23][24][25], sensorless control methods for a BLDC drive using an FSTP inverter are reported. The position sensorless control of PMSM driven by an FSTP inverter is introduced in [26][27][28]. In [29], a direct torque control (DTC)-based BLDC motor driven by an FSTP inverter that employed a novel optimum switching table which enables the independent simultaneous control of the electromagnetic torques developed by the phases connected to the inverter legs without requiring explicit stator flux control is achieved.…”

“…Moreover, to eliminate the third-order harmonics, a larger value of switching frequency should be selected [58][59][60][61][62][63]. FSTP inverter control topologies have been adapted to sensorless PMSM drives in [26][27][28]. In [66], although the sensorless FSTP inverter of PMSM drive is proposed, ANN is used to achieve a sensorless drive which has a complicated algorithm.…”