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equivalent resistant
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     Because the leakage inductance shouldn't be ignored in high-speed motors, the finite element method of leakage inductance of rare-earth PM brushless DC motor are deduced in the fourth sector, and equivalent resistant is presented here, which makes the design more appropriate. Reason and the minimize way of torque ripple were presented also.
     同时,由于在大功率、高转速的永磁无刷直流电动机中,电流受漏感的影响从而改变了电机的性能,因此漏感的作用不容忽视。 本文推导了稀土永磁无刷直流电动机漏电感计算的有限元方法,引入了电机等效电阻系数,并针对电磁转矩脉动和齿槽转矩脉动的产生的原因,给出了多种有效的抑制方法,使电机设计更为合理。
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     The formula of magnetooptic specimen is (BiTm) 3(FeGa) 5O 12 ,which has two surface with thickness of 6 19×2μm. The AMF corresponding the saturation Faraday's rotation angle is 8000A/m. The domain wall(DW) can be considered as the 180 degree wall and the equivalent resistant field is the order of 1000A/m in the thin film specimen.
     通过对 (BiTm) 3 (FeGa) 5O12 膜施工加低频交变磁场 ,匀速率增加的直流磁场和同时对该膜施加这两种磁场 (复合外场 ) ,用照相划线读数方法和通过电荷耦合器件 (CCD) 计算机作数字化处理获得磁畴壁 (DW)的相对百分数。
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     In this paper, by using fire resistant test with fire protection layer of thin-shape paints and considering equivalent resistant time of typical components, introduce a practice method of fire resistant design and calculate.
     文中介绍了在工程设计中,结合薄型涂料保护层的构件耐火实验,考虑各构件 的当量耐火时间,对钢构件进行抗火计算和设计的方法。
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The motion characteristics of the magnetic thin film have been studied under various forms of applied magnetic field(AMF):pulse,A.C. field and D.C.field [1~6] .In present paper,the dynamic behaviour of the magntooptic thin film under the composite fields has been measured experimentally.The formula of magnetooptic specimen is (BiTm) 3(FeGa) 5O 12 ,which has two surface with thickness of 6 19×2μm.The AMF corresponding the saturation Faraday's rotation angle is 8000A/m.The domain wall(DW)...

The motion characteristics of the magnetic thin film have been studied under various forms of applied magnetic field(AMF):pulse,A.C. field and D.C.field [1~6] .In present paper,the dynamic behaviour of the magntooptic thin film under the composite fields has been measured experimentally.The formula of magnetooptic specimen is (BiTm) 3(FeGa) 5O 12 ,which has two surface with thickness of 6 19×2μm.The AMF corresponding the saturation Faraday's rotation angle is 8000A/m.The domain wall(DW) can be considered as the 180 degree wall and the equivalent resistant field is the order of 1000A/m in the thin film specimen.There are three forms of AMF∶type A,low frequency A.C.(the amplitude 140A/m) produced by a function generator;type B,uniform magnetic field sweeping(UMFS,d H /d t =83 6A/m/S in present paper ,H is the magnetic field) produced by a D.C. power supply with a sweeping rate control system [6] ;type C,the UMFS together with low frequency A.C.field.We remark the type C as the composite field.The data of DWs motion have been obtained by means of the computer with charge couple device(CCD) and of photography from the polarization microscope.The transformer put on the stage of the microscope was prepared a fair hole to lay up the thin film specimen and was connected to the D.C.power supply or/and to the function generator for carrying out AMF.The average distance of DWs from the photography for various experiment conditions of H could be plotted against the time.The percentage data of DWs area from the CCD for various experiment conditions of H do the time in the same grapher.After comparing the dynamic character of DWs with these curves corresponding to 0 1~10Hz A.C.fields or/and to d H /d t =83 6A/m/S UMFS rate,it can be shown that: (1)The motion behaviors of DWs in the AMF of type C are not the same as that of simple composition of type A and type B,it would be an interaction term represented the force between AMF and DWs [7] . (2)Even if the amplitude of A.C.field value 140A/m1000A/m,the equivalent resistant field [6] ,and the value of D.C.field100A/m,the DWs of the thin film specimen can be moved.The motion of DWs is not synchronized with the AMF.It is supposed that the DWs may be easier to move and can be pushed forward or pulled back by a small D.C.field superposed a weak A.C.field.

通过对 (BiTm) 3 (FeGa) 5O12 膜施工加低频交变磁场 ,匀速率增加的直流磁场和同时对该膜施加这两种磁场 (复合外场 ) ,用照相划线读数方法和通过电荷耦合器件 (CCD) 计算机作数字化处理获得磁畴壁 (DW)的相对百分数。结果表明 :( 1 )复合外场下DW运动规律中存在交互作用项 ;( 2 )低频交变磁场幅值 ( 1 4 0A/m)远低于等效阻力场 ( 1 0 3 A/m)时 ,DW可以运动 ,但不同步 ,频率大于 1Hz时明显滞后 ,( 3 )利用图像转换有利于提高实验结果的分辨率。

In this paper, by using fire resistant test with fire protection layer of thin-shape paints and considering equivalent resistant time of typical components, introduce a practice method of fire resistant design and calculate.

文中介绍了在工程设计中,结合薄型涂料保护层的构件耐火实验,考虑各构件 的当量耐火时间,对钢构件进行抗火计算和设计的方法。

 
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