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This paper presents a method for designing a high power motor that is applicable to electric vehicles. Interior Permanent Magnet (IPM) type motor which has high efficiency and high durability is selected. To apply for the electric vehicles, a form, a tire and a wheel of vehicles are considered when calculating a motor performance. After calculating a motor performance, space harmonic analysis and FEA(Finite Element Analysis) is used for designing In-Wheel motor.
The purpose of this study was to examine websites for Hanstyle in an attempt to find out about the state of Hanstyle in e-market, to suggest how to boost Hanstyle industry, and to present some of future vision for that. After relevant websites were analyzed two years ago, online general shopping malls that ranked first to tenth by Rankey.com two years ago were checked to see whether or not Hanstyle stores and Hanstyle categories were included in them. And the same investigation was conducted again to figure out the present situation. As a result, it's found that most of the websites investigated were in the form of homepage, but the number of online shopping malls increased. Some of the websites provided customers with a chance to buy traditional Hanbok in a way to be similar to online shopping. Franchise stores for lending Hanbok appeared, and some of the sites offered wedding consulting services. In 2004, two of the general shopping malls contained Hanbok categories, and in 2006, every general shopping mall that numbered 10 were equipped with Hanbok categories. Among different kinds of Hanstyle, children's Hanbok was carried by the largest number of the shopping mall sites, which was followed by casual Hanbok, Hanstyle for lending and traditional one. In conclusion, Hanstyle started to make its way through online market, and companies tried to apply a variety of marketing strategies in order to publicize themselves and to attract online customers. But it should be noted here that what matters is making research on the online sale of traditional Hanbok, as tailor-made traditional Hanbok was still dominant in this market.
In motor design, an important factor is the content of silicon in coss material, which can effect the saturation of magnetic circuit and coss loss. While the content of silicon is high, the core loss will be reduced. At the same time, in order to assure the effective flux, the magnetizing current must be increased and then the copper loss becomes higher. Therefore the material with high content of silicon, which is used in the motor, can not always give the high efficiency. In this paper flux linkage of two different material s10 and s60 is compared according to the operating region and then exciting current to obtain same flux is estimated. By comparing core loss and copper loss between two material with the estimated current and flux linkage, this paper presents a criterion in determining the material for higher efficiency
This paper deals with the cost reduction design of a single-phase line-start permanent magnet (LSPM) motor. Due to high cost of the permanent magnet (PM), cost reduction can be effectively achieved by reducing PM volume. Therefore, motor characteristics according to the PM volume are calculated by using d-q axis equivalent circuit analysis, and the characteristic map is made. In the characteristic map, maximum torque and efficiency are shown according to motor parameters such as back electromotive force (back emf) and inductances; back emf represents the PM volume. Minimum back emf and inductances satisfying output performance are determined in the characteristic map. Then, motor geometry based on the prototype motor is optimized to get the determined parameters using response surface methodology (RSM) and finite element method (FEM). Through the presented cost reduction design, total PM volume is reduced to 32% of prototype model.
This paper deals coreloss distribution of interior permanent magnet synchronous motor in the field weakening region and related problems to d-q axis equivalent analysis. Generally d-q axis equivalent circuit analysis is generally used for motor analysis, and it provides good analysis results. However, coreloss result of d-q axis equivalent circuit analysis results in significant difference with finite element analysis especially in the field weakening operation region. Reason of the difference is discussed and finite element analysis and d-q axis equivalent circuit analysis are used for field calculation and verification.