การขับเคลื่อนมอเตอร์เหนี่ยวนำแบบไร้ตัววัดความเร็วโดยควบคุมฟลักซ์และแรงบิดด้วยวิธี MRAS

Flux and Torque Control of Induction Motor Sensorless Drive Based on MRAS

Name: บรรหาร สุทธิพรสมบัติ

Name: Banharn Sutthiphornombat

Organization : มหาวิทยาลัยเทคโนโลยีพระจอมเกล้าธนบุรี

keyword: MRAS

; Speed Sensorless

; Induction Motor

; Space Vector Modulation

Abstract: Customarily, knowledge of rotor speed is necessary to obtain a high dynamic performance in speed control of the induction motors, measurements are required. The measurement speed control of induction motors is orienting the inject stator current vector and establishing a speed-loop feedback. However, carry out these measurements requires expensive sensors, whose installations are also cumbersome. To overcome these problems, the MRAS (Model Reference Adaptive System) is used to approximate the speed of the induction motors. The intention of this thesis is to control the induction motor without sensors. The chronicled technique is very simple and robust to variations of motor parameter. Fundamentally, the stator flux and torque must be calculated and controlled by the direct torque control technique. The reactive power MRAS reckons the difference between the reactive power in reference and adaptive model from the mathematical patterns. Thence, the different error is the input of proportional-integral controller (PI-controller), which outcomes the estimated speed of the induction motors. Therefore, in this thesis the sensorless flux and torque are controlled by use the reactive power MRAS of induction motors. They are compared with reference value both stator flux and torque, the proper manipulate voltage is chosen based on these errors and rotor speed which is estimated by MRAS. Principally, all of the systems are operated rooted on space vector modulation (SVM) technique. A 0.37 kW 4-pole 1400 rpm 380V squirrel-cage motor is set for both MATLAB/SIMULINK simulation experiments and practical experiments as well. The implementation of this sensorless control in the induction motor drives with flux and torque control is scrutinized. The implementation in this sensorless technique is found by use a contemporarily available 16-bit ADMC331 digital signal processor, which is used as the controller while the inverter operates at 10 kilohertz switching frequency.The experimental results show that the difference between measured speed and estimated speed is almost imperceptible as well as show a good energetic response which under sensorless control of induction motors is extremely good and fast.

มหาวิทยาลัยเทคโนโลยีพระจอมเกล้าธนบุรี

Address: กรุงเทพมหานคร

Email: info.lib@mail.kmutt.ac.th

Name: Veerapol Monyakul

Role: Supervisor

Created: 2546

Issued: 2005-11-23

Modified: 2553-11-07

วิทยานิพนธ์/Thesis

ISBN: 9744561262

CallNumber: EEE1676

tha

DegreeName: วิศวกรรมศาสตรมหาบัณฑิต

Level: ปริญญาโท

Descipline: วิศวกรรมไฟฟ้า

Grantor: มหาวิทยาลัยเทคโนโลยีพระจอมเกล้าธนบุรี

©copyrights มหาวิทยาลัยเทคโนโลยีพระจอมเกล้าธนบุรี

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