DocumentCode :
231052
Title :
An high performance direct torque control method with PWM approach of PMSMs
Author :
YunChang Kwak ; Jin-Woo Ahn ; Dong-Hee Lee
Author_Institution :
Dept. of Mechatron. Eng., Kyungsung Univ., Busan, South Korea
fYear :
2014
fDate :
Feb. 26 2014-March 1 2014
Firstpage :
61
Lastpage :
66
Abstract :
PMSM(Permanent Magnet Synchronous Motor)s are much widely used in the control systems of the industrial application and robotics due to the high control performance and high power density with high efficiency. For the torque control of PMSM, direct torque control(DTC) schemes are much interested due to the easy implementation and fast dynamic response. Though its fast dynamic response, high torque and flux ripples with random switching frequency are still a major drawback to be applied to the practical system. The DTC-PWMs(Direct Torque Control-Pulse Width Modulation) are good choice to overcome the higher ripple and random switching. The duty ratio calculation algorithm of DTC-PWMs is the most important to advance the control performance. This paper presents a high performance a Direct Torque Control with PWM approach based on the approximate voltage function. In the proposed control scheme, 12-side sectors division is used to reduce the torque angle variation based on the supplied voltage analysis. And the voltage vector selection is determined by the error level selector of the flux and torque. Unlike the CDTC-PWMs(Conventional DTC-PWM), three different voltage vectors can be selected according to the flux and torque error level. The proper voltage vector among three different voltage vectors is determined by the designed error level selector to reduce torque and flux ripple with fast dynamic response. For the calculation of the PWM duty ratio, the approximated voltage functions based on the d-q voltage analysis of the selected voltage vector are proposed in this paper. And the approximated voltage functions which are described as voltage angle are used as the denominator of the duty ratio calculator. The duty ratio of the proposed method uses the flux and torque ripple with speed information using approximated voltage functions. The proposed control scheme is verified by the experiments using the proto-type PMSM.
Keywords :
permanent magnet motors; synchronous motors; torque control; PMSM; PWM; error level selector; fast dynamic response; high performance direct torque control method; permanent magnet synchronous motor; pulse width modulation; random switching frequency; voltage vector selection; Least squares approximations; Niobium; Pulse width modulation; Switches; Torque; Vectors; Voltage control; 12-side sectors division; Approximate Voltage Function; DTC-PWM(Direct Torque Control-Pulse Width Modulation); Error level selector; PMSMs(Permanent Magnet Synchronous Motor);
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Industrial Technology (ICIT), 2014 IEEE International Conference on
Conference_Location :
Busan
Type :
conf
DOI :
10.1109/ICIT.2014.6894973
Filename :
6894973
Link To Document :
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