Implementation of sensorless IPMSM drive using the stator current space vector orientation reference frame

Abstract

Purpose

In this paper an adaptive nonlinear control scheme has been proposed for direct torque and flux control of interior permanent magnet synchronous motor (IPMSM) without using mechanical sensor.

Design/methodology/approach

In this control method the stator resistance is online estimated by adaptive input-output state feedback linearization (AIOFL) controller. Based on proposed control scheme, the strategies of the maximum torque per ampere (MTPA) and maximum power factor (MPF) have been tested using a so-called stator flux search method.

Findings

The motor equations are transferred from the stationary reference frame to the (SX-SY) two-axis frame of the current by the stator current angle. In this frame, the Y component of the motor current is set to zero and the implementation of the nonlinear controller is independent of the two-axis inductances, the rotor magnetic flux, and position.

Practical implications

The effectiveness and capability of the proposed control method has been verified by simulation and experimental results. The proposed control scheme can be used for the sensorless control of IPMSM drive in industrial applications such as electric vehicle, traction system, and air conditioner.

Originality/value

The proposed controller is developed in a special axis (X-Y) rotating reference frame with the X-axis in coincide with the machine current space vector so that there is no need to use and know the machine inductances and rotor position.

Citation

Najjar-Khodabakhsh, A. and Soltani, J. (2016), "Implementation of sensorless IPMSM drive using the stator current space vector orientation reference frame", COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, Vol. 35 No. 3. https://doi.org/10.1108/COMPEL-08-2015-0286