A High-Performance Sensorless Control System of Reluctance Synchronous Motor with Direct Torque Control by Consideration of Nonlinearly Inductances

Min-Huei Kim; Nam-Hun Kim; Won-Sik Baik

A High-Performance Sensorless Control System of Reluctance Synchronous Motor with Direct Torque Control by Consideration of Nonlinearly Inductances

Min-Huei Kim

Nam-Hun Kim

Won-Sik Baik

Vol. 2, No. 2, pp. 146-153, Apr. 2002

10.6113/JPE.2001.02.2.146

Inductance Compensator

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Abstract

This paper presents an implementation of digital control system of speed sensorless for Reluctance Synchronous Motor (RSM) drives with direct torque control (DTC). The problem of DTC for high-dynamic performance RSM drive is generating a nonlinear torque due to a saturated nonlinear inductance curve with various load currents. The control system consists of stator flux observer, compensating inductance look-up table, rotor position/speed/torque estimator, two hysteresis band controllers, an optimal switching look-up table, IGBT voltage source inverter, and TMS320C31 DSP controller. The stator flux observer is based on the combined voltage and current model with stator flux feedback adaptive control that inputs are the compensated inductances, current and voltage sensing of motor terminal with estimated rotor angle for wide speed range. The rotor position is estimated by observed stator flux-linkage space vector. The estimated rotor speed is determined by differentiation of the rotor position used only in the current model part of the flux observer for a low speed operating area. It does not require the knowledge of any motor parameters, nor particular care for motor starting, In order to prove the suggested control algorithm, we have simulation and testing at actual experimental system. The developed sensorless control system is showing a good speed control response characteristic results and high performance features in 20/1500 rpm with 1.0Kw RSM having 2.57 ratio of d/q reluctance.

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Cite this article

[IEEE Style]

M. Kim, N. Kim, W. Baik, "A High-Performance Sensorless Control System of Reluctance Synchronous Motor with Direct Torque Control by Consideration of Nonlinearly Inductances," Journal of Power Electronics, vol. 2, no. 2, pp. 146-153, 2002. DOI: 10.6113/JPE.2001.02.2.146.

[ACM Style]

Min-Huei Kim, Nam-Hun Kim, and Won-Sik Baik. 2002. A High-Performance Sensorless Control System of Reluctance Synchronous Motor with Direct Torque Control by Consideration of Nonlinearly Inductances. Journal of Power Electronics, 2, 2, (2002), 146-153. DOI: 10.6113/JPE.2001.02.2.146.