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Study of AC Asynchronous Speed Sensor-less Control System

Author: ZhuJinZuo
Tutor: WuJunJi
School: Nanjing University of Technology and Engineering
Course: Proceedings of the
Keywords: Variable voltage variable frequency speed control Direct Torque Control Model Reference Adaptive Asynchronous motor
CLC: TM343
Type: Master's thesis
Year: 2010
Downloads: 243
Quote: 1
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Abstract


Asynchronous motors , variable voltage variable frequency speed control system is generally referred to as variable speed system . The slip power in the governor does not vary with speed , wide speed range , either high-speed or low-speed high efficiency , high dynamic performance, can take some technical measures can be comparable with the DC speed control system . Direct torque control of AC induction motor control following the vector control technology , the rapid development of a new type of high-performance AC speed control system technology . Direct torque control analysis of mathematical model of the AC motor stator coordinate system without the need for the decoupling of the mathematical model of the asynchronous motor rotation transformation , only to the stator flux , without the parameters of the rotor circuit , both the direct control of torque , but also directly control the stator flux ; simple control structures , control means direct , high dynamic and static performance . This paper first analyzes the dynamic mathematical model of the AC induction motor and the coordinate transformation and the transformation matrix describes the basic principle and structure of the direct torque control system , and simulation of the hexagon direct torque control system , in the low-speed conditions improved the torque regulator , flux observer circular flux and direct torque control system for good low-speed performance . Speed ??sensor speed estimation is an important research direction in modern AC drive must be introduced , in order to get good speed performance , speed feedback . This paper first introduces the slip angular frequency calculations focus on speed is estimated , based on the the Popov stability theory model reference adaptive correction voltage model rotor flux in low-speed conditions , improve the speed estimation accuracy . Last TMS320LF2812 from both hardware and software to complete the AC induction motor without speed sensor design .

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