• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2010.05a
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• pp.121-122
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• 2010

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
• /
• 2010.05a
• /
• pp.158-159
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• 2010

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
• /
• 2011.04a
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• pp.729-730
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• 2011

• Proceedings of the KIEE Conference
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• 1990.07a
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• pp.361-362
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• 1990

• 전기의세계
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• v.24 no.5
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• pp.21-30
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• 1975

These studies aim to support technically the National Rural Electrification Program now in progress by analyzing several engineering problems in regard to the program and then suggesting some appropriate solutions or measures. The contents of these studies are divided into three categories; (1)optimized distribution systems for the rural electrification, (2)optimized rural illumination and (3)single-phase operation of three-phase motors.

• Proceedings of the Korean Vacuum Society Conference
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• 2002.06a
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• pp.35-35
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• 2002

• Proceedings of the KIEE Conference
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• 2008.11b
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• pp.95-97
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• 2008

The binary observer estimates the rotor position and rotor flux with alleviation of the high-frequency chattering, and retains the benefits achieved in the conventional sliding observer, such as robustness to parameter and disturbance variations. The position sensorless control of SRM under the load and inductance variation is verified by the experimental results.

• Proceedings of the KIEE Conference
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• 1985.07a
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• pp.277-279
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• 1985

• Journal of the Korean Society for Precision Engineering
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• v.25 no.5
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• pp.7-14
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• 2008

• Journal of Mechanical Science and Technology
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• v.16 no.8
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• pp.1089-1094
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• 2002

Mobile communication industry powered by electronics and information technology is building a transforming way for human communication. The latest electronics is so saturated to forget the difficulty in size reduction of electronic parts. However, mechanical parts, such as dynamic speakers and vibration motors, are intrinsically not easy to realize size reduction due to their construction. In this paper, a hexahedral type with simpler configuration is introduced to substitute for the conventional vibration motors. For uneven magnetic field analysis of the hexahedral type, FEM was used to determine magnetic flux density. After an analysis of magnetic and mechanical characteristics, it is shown that the coil configuration is the most important parameter to increase the output torque, and thus vibration. For optimization, genetic algorithm is used to find the optimal configuration of coil to maximize the output torque. Experimental results are also followed to confirm the validity of the proposed design.