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Asymmetric Rotor Design Based on Advanced Inverse Cosine Function for Improving Electrical and Mechanical Characteristics of Synchronous Motor

Title
Asymmetric Rotor Design Based on Advanced Inverse Cosine Function for Improving Electrical and Mechanical Characteristics of Synchronous Motor
Other Titles
동기 모터의 전기적, 기계적 특성 향상을 위한 Advanced Inverse Cosine Function 기반 비대칭 회전자 설계
Author
정영훈
Alternative Author(s)
정영훈
Advisor(s)
임명섭
Issue Date
2020-08
Publisher
한양대학교
Degree
Doctor
Abstract
Recently, electric motors widely used in various fields, such as vehicles, and home appliances, require not only high efficiency and high-power density, but also low torque ripple, low vibration, and low induced voltage harmonic. Since synchronous motors are widely used to achieve high efficiency and high-power density, this thesis proposes an asymmetric rotor design to improve the electrical and mechanical characteristics (torque ripple, induced voltage, vibration) of synchronous motors. From the motor design point of view, to improve the electrical and mechanical characteristics, the number of poles and slots is changed, or the shape of the motor is changed using an optimization technique. However, changing the number of poles and slots has a disadvantage in that the initial design of the electric motor should be reperformed, and the optimization technique has a disadvantage in that it takes a lot of time to select a design variable and an optimized model. The objective of changing the shape of the motor is to make the air-gap flux density sinusoidal. However, a commonly used eccentric rotor shape (ERS) has a limitation to making the sinusoidal air-gap flux density under the load condition since an ERS makes the air-gap flux density sinusoidal under the no-load condition. This thesis proposes an advanced inverse cosine function (AICF), which is a formula for calculating the air-gap length to make the air-gap flux density sinusoidal under the load condition. Since the AICF considers the armature reaction, an asymmetric air-gap length is obtained, resulting in being designed an asymmetric rotor shape. By applying the AICF, the air-gap flux density can be made sinusoidal, improving the electrical and mechanical characteristics. In this thesis, the AICF is applied to the various motor types, and the electrical and mechanical characteristics of the AICF model are compared to the cylindrical model and ERS model using finite element analysis. Also, the electrical parameters, iron loss, and efficiency between the cylindrical and AICF models are additionally compared. Finally, through the test, it is verified that the proposed method is effective in reducing the torque ripple, induced voltage, and vibration.
URI
https://repository.hanyang.ac.kr/handle/20.500.11754/153013http://hanyang.dcollection.net/common/orgView/200000438057
Appears in Collections:
GRADUATE SCHOOL[S](대학원) > AUTOMOTIVE ENGINEERING(미래자동차공학과) > Theses (Ph.D.)
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