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이겨레(Gyeorye Lee),민승재(Seungjae Min),홍정표(Jung-Pyo Hong) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
Induction motor is considered as an alternative type of a traction motor for hybrid cars due to the lack of rare earth material and ease of manufacturing. However, the magnetic flux ripple in the air gap increases the noise and decreases the motor performance so that the magnetic wedge is used in the stator slot. But the application of isotropic magnetic wedge increases the leakage flux and reduces pull out torque and starting torque. In order to overcome this limitation, an anisotropic magnetic wedge which has different permeabilities with directions is applied and shape design is worked to reduce the leakage flux and the flux ripple in the air gap. This paper proposes the optimal design of the anisotropic magnetic wedge to maximize the pull out torque using material boundaries represented by the level set function are moved by the sensitivity of the objective function. Time-harmonic electro-magnetic analysis is performed and then torque profile and efficiency are evaluated. The proposed method is applied to the reference design problem and validated to improve the design.
이겨레(Gyeorye Lee),민승재(Seungjae Min),홍정표(Jung-Pyo Hong) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
Induction motor is considered as an alternative to replace permanent magnet motors, due to ease of manufacturing and lack of rare earth material. However, since induction motor is relatively large in size and has low power density, previous studies have performed to increase the performance by changing the pre-defined parameters of rotor slot. In this paper, level set-based shape optimization is applied to design the optimal shape of rotor slot for torque maximization. Material boundaries represented by level set function are moved by the sensitivity of the objective function. To identify the rated current at each optimization process, the equivalent circuit parameters of induction motor are calculated using the finite element method. Based on the calculated current, time-harmonic magnetic analysis is performed and the rated torque and power are evaluated. The proposed method is applied to the reference design problem and validated to obtain the improved design.