A Novel Seamless Direct Torque Control for Electric Drive Vehicles

Ahmad Ghaderi; Takaji Umeno; Yasushi Amano; Sugai Masaru

A Novel Seamless Direct Torque Control for Electric Drive Vehicles

Vol. 11, No. 4, pp. 449-455, Jul. 2011

10.6113/JPE.2011.11.4.449

Direct torque control

PDF

Abstract

Electric drive vehicles (EDV) have received much attention recently because of their environmental and energy benefits. In an EDV, the motor drive system directly influences the performance of the propulsion system. However, the available DC voltage is limited, which limits the maximum speed of the motors. At high speeds, the inverter voltage increases if the square wave (SW) voltage (six-step operation) is used. Although conventional direct torque control (DTC) has several advantages, it cannot work in the six-step mode required in high-speed applications. In this paper, a single-mode seamless DTC for AC motors is proposed. In this scheme, the trajectory of the reference flux changes continuously between circular and hexagonal paths. Therefore, the armature voltage changes smoothly from a high-frequency switching pattern to a square wave pattern without torque discontinuity. In addition, because multi-mode controllers are not used, implementation is more straightforward. Simulation results show the voltage pattern changes smoothly when the motor speed changes, and consequently, torque control without torque discontinuity is possible in the field weakening area even with a six-step voltage pattern.

Statistics

Show / Hide Statistics

Cumulative Counts from September 30th, 2019
Multiple requests among the same browser session are counted as one view. If you mouse over a chart, the values of data points will be shown.

Cite this article

[IEEE Style]

A. Ghaderi, T. Umeno, Y. Amano, S. Masaru, "A Novel Seamless Direct Torque Control for Electric Drive Vehicles," Journal of Power Electronics, vol. 11, no. 4, pp. 449-455, 2011. DOI: 10.6113/JPE.2011.11.4.449.

[ACM Style]

Ahmad Ghaderi, Takaji Umeno, Yasushi Amano, and Sugai Masaru. 2011. A Novel Seamless Direct Torque Control for Electric Drive Vehicles. Journal of Power Electronics, 11, 4, (2011), 449-455. DOI: 10.6113/JPE.2011.11.4.449.