| Summary: | 碩士 === 國立聯合大學 === 機械工程學系碩士班 === 105 === In current society, science and technology development is changeable and the industry is rapidly developing so that automation has become popular. Motors have been broadly applied from industry to staple merchandise. Especially, the boom of semiconductor electronics has brushless direct current motors (BLDC Motor) become the most potential motor product and be gradually promoted in various fields, such as industrial machines, military equipment, household electrical appliance, and motor-driven carriers.
When a brushless DC motor is applied to electric vehicles, the high-speed characteristics could not satisfy the needs of the system characteristics. A brushless DC motor runs in a rated power area that the back electromotive force would enhance with increasing rotating speed. It therefore reduces the input current and the turning moment which sharply decrease the turning moment-rotating speed characteristic curve in the rated power area so that the needs of high-speed speed multiplying for electric vehicles could not be satisfied.
It is therefore worth in-depth discussion to enhance the high rotating speed characteristics of motors. Meanwhile, it is a critical technique to apply motors to electric vehicles. For this reason, a mechanical variable structure is proposed to enhance the output characteristics of motors in high speed. The electromagnetic field simulation software (Ansys Maxwell) is applied in this study to assist in the motor magnetic circuit design and the characteristic analysis. A variable structured motor is further implemented to verify the practicability.
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