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CHAPTER 3. CONCLUSION AND FUTURE WORKS

3.2 Future Works

The future works are summarized as follows:

A. Measurement of three-DOF orientation B. Magnetic field design

C. Torque estimation and control for spherical motor

The orientation measurement system presented in this thesis can measure two orientation angles.

Some application requires three orientation angle, not only  and  Euler angle but also spinning motion γ. Therefore, three-DOF orientation measurement system has to be developed to apply some

The magnetic source is important parts in magnetic tracing system. A cylindrical PM used in this system can measure only two orientaion angles due to the symmetry of the magnetization of PM along the z axis. Some researchers suggested to measure position/orienataion of magnetic source using multi- magnet [24]. Combination of magnets or another shape of PM can overcome this limitation and can make system more simple.

The dynamic model of spherical motor can be derived using Lagrange formulation [20]. The orientation can be used not only for orientation/position control of spherical motor but also for torque estimation because torque is derived by orientation defined as Euler angles (, , γ).

REFERENCES

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ACKNOWLEDGEMENT

First of all, I would like to express my sincere gratitude to my advisor Assoc/Prof Hungsun Son for his academic guidance throughout this research. He is very knowledgeable and always coming up with new ideas. It inspired me and played an important role in the successful completion of this thesis. He also gave me a generous help when I started my graduate life and it was very helpful to me. It was an honor for me to work under Prof. Hungsun Son and I always respect him as my mentor.

I want to thank the research former members Wu Fang and Guo Jinjun. During this research, I was able to study research background with their previous research.

I also want to thank my companions in the Electromechanical Systems and Control Lab(ESCL) Jiyun Jeon, Myunggun Kim, Seongmin Lee, Chanbeom Bak, Minho Shin, Hoyoung Kim, Wonmo Chungm, Sangheon Lee and Soyoon Kim for their helpful support and advices. Especially, I have obtained numerous suggestions and feedback from group meeting members Jiyun Jeon, Chanbeom Bak and Wonmo Chung. Their assistances are greatly appreciated.

I would like to thank my family Yeonok Shin, Sugeun Kim and Jisun Kim for their long-time supports throughout my educational career. Without their support, it would have been impossible for me to complete this work.

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