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Design and Application of Induction Motor Direct Torque Control System

Author: LiuBin
Tutor: ShenQunTai
School: Central South University
Course: Control Theory and Control Engineering
Keywords: direct torque control fuzzy control TMS320F240 DSP fuzzy PID
CLC: TM343
Type: Master's thesis
Year: 2005
Downloads: 631
Quote: 12
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Abstract


The technique of Direct Torque Control has been developed from 1980’s. Following the vector control technique, by the quick development, DTC has been a new high performance AC driving technique. In this thesis the author made a study of asynchronous motor and DTC.The stator flux calculation of DTC is very important to the system of DTC. The stator flux calculation of DTC has three methods including U— I method, I—N method, U—N method. Because all of the three methods have disadvantage, we have to adopt U—I method when the motor works in high speed and adopt I—N method when in low speed. But how to switch between two speed modules becomes a trouble problem. This paper designs a new method for speed modules switching.Traditional DTC system has a shortcoming that it can’t distinguish the value of torque and stator flux’s error. To overcome this disadvantage of traditional DTC, a kind of fuzzy controller is adopted. We also design fuzzy PID velocity adjustor to instead traditional PID velocity adjustor. The designs above improve the effect of asynchronous motor.Adopting the DTC method introduced above and the stator flux calculation, the results are tested by means of DSP and IPM. The results prove that the control design is effective.

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CLC: > Industrial Technology > Electrotechnical > Motor > AC motor > Induction motor
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