Advanced Magnetic Material Requirement for Higher Efficient Electrical Motor Design

摘要

In order to realize the energy saving society, higher efficient electrical apparatus is required. Magnetic material is used in it to obtain higher magnetic flux density. 3 kinds of electromagnetic theory are used in the electromagnetic apparatus. The one is Faraday's law as shown in the next equation. A transformer. is considered to be its application. rotE =-(?B)/(?t) The next is Maxwell stress as shown in the next equation. An electrical motor or generator is considered to be its application. F=(∮∮)[T_m]?ndS_(ThinSTeelPlate) ,here [T_m]=1/μ_0[1/2(B_x~2-B_y~2-B_z~2) B_xB_y B_xB_z B_yB_x 1/2(B_y~2-B_z~2-B_x~2) B_yB_z B_zB_x B_zB_y 1/2(B_z~2-B_x~2-B_y~2)]. The last is magnetic energy as shown in the next equation. A reactor in an electrical circuit is considered to be its application. E=∫B?dH.