||Study of Speed Sensorless Control of Brushless DC Motor Using Rotor Flux State Observer
||Department of Engineering Science
Brushless DC Motor
Speed Sensorless Control
Rotor Flux State Observer
Electrical machines have already become the major source of motive power in the present age. The brushless dc motors possess some advantages such as higher power density, higher efficiency, and simpler controllability. Hence synchronous ac motors become rather popular for many applications, such as compressors, automotive, and household products etc.
For the speed drive of a BLDC motor, information on rotor position is indispensable. However, mounting a position sensor on the rotor causes several drawbacks from the viewpoints of reliability, cost, size, and cable wiring. In order to cope with these drawbacks, a number of sensorless control methods have been proposed so far. In the last two decades, several approaches on sensorless control for BLDC motor have been proposed and developed.
This thesis proposes a sensorless control method using a rotor flux state observer to estimate rotor position and speed estimator. In the proposed rotor flux state observer, the flux due to rotor magnet is chosen as the state variable, and the rotor position and speed could be estimated. The Lyapunov stability theorem is used to prove the rotor flux state observer system is stable. Finally, simulated and experimental results are presented and verify the proposed sensorless method is feasible.
Chinese Abstract Ⅰ
List of Tables Ⅵ
List of Figures Ⅶ
Chapter 1 Introduction 1
1.1 Motivation 1
1.2 Structure of the Thesis 3
Chapter 2 Modeling Control of Brushless DC Motor 5
2.1 Mathematical Model of BLDC 5
2.2 Hall-effect sensor of BLDC 7
2.3 Six-Step Square Wave Driving of BLDC 8
Chapter 3 BLDC Motor Speed Estimator Design 15
3.1 Review of Sensorless Control Methods 15
3.2 Speed estimator Design of Sensorless Control 17
Chapter 4 Simulations 22
4.1 Structure of the Simulations System 22
4.2 Comparisons of Different Speed Commands with Free Loading 23
4.3 Comparisons of Different Speed Commands with Loading of 1 N-m 27
Chapter 5 Experiments 34
5.1 The Equipment Block 34
5.2 The Software Configuration 35
5.3 The hardware configuration 37
5.3.1 Microchip dsPIC30F3011 37
5.3.2 The Motor Driver 39
5.4 The Experimental Results 43
5.4.1 Comparisons of Different Speed Commands with Free Loading 43
5.4.2 Comparisons of Different Speed Commands with Loading of 1 N-m 47
Chapter 6 Conclusions 52
6.1 Conclusions 52
6.2 Suggestion for Future Research 53
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