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1.
HAYATOSHI YAMADA 《电力部件与系统》2013,41(5):423-432
ABSTRACT Surface loss due to higher harmonic magnetic flux in solid pole synchronous motor is generally quite significant. This loss is present in both synchronous and solid rotor induction motors. Grooving may be adopted as a method to reduce the surface loss of the solid pole. As the presence of the grooves on solid poles causes a part of the eddy current which is considered as an end effect problem, strictly theoretical solution of the problem is extremely difficult. In this paper loss equation of two layer rotor construction and approximate equation of the loss equation are analyzed. If the depth of the groove is small compared with the depth of harmonic flux penetration, the part of the solid pole surface is considered partly to be the two layer rotor construction. Measured value of surface loss of grooved solid rotor is described and studied by considering the end effect. Correction cofficient kr1, about the end effect is obtained by the experiment. The surface loss reduction factor is also obtained. This grooving technique is used for the solid pole synchronous motor and for the claw pole machine. 相似文献
2.
KIJA LEE KAHO UEGAKI CHIHIRO NISHII TADASHI NAKAMURA AUSKA KUBOTA TSUNAO HIRAI KAZUTAKA YAMADA 《International Journal of Dairy Technology》2012,65(2):232-236
Computed tomography (CT) was performed on Gouda‐type cheese during ripening to evaluate gas hole formation and structural quality. The cheese was exposed to different ripening conditions, including variations in ripening temperature and concentration of butyric acid bacteria. Computed tomography images were obtained every 2 weeks for 16 weeks to assess the volume, shape and location of gas holes. The results demonstrate that CT makes the nondestructive monitoring of cheese gas hole formation and evaluation of the structural features of cheese possible throughout the ripening period. 相似文献
3.
We discuss checking policies, in which an inspector is requested to perform the check, for a ono-unit system. Applying the unique modifications of Markov renewal processes, we analyse the stochastic behaviour of each CR policy (checking request policy) and CRSL policy (checking request and surveillance limit policy), where it is assumed that the failure time for each unit and the inspector's arrival time havo arbitrary distributions. Introducing replacement eosts, the request for the inspector to perform the check, system failure and surveillance, we derive the optimal policies which maximize the cost effectiveness under suitablo conditions for each model. In particular, wo discuss the optimal policies as a non-linear programming problem with two variables. 相似文献
4.
感应电机无速度传感器矢量控制系统的定子电阻在线辨识 总被引:16,自引:16,他引:16
该文针对利用磁通观测器推算转子磁通的感应电机无速度传感器矢量控制系统,提出了定子电阻在线辨识法。在利用q轴磁通推算转速的基础上,该系统利用d轴磁通误差实现定子电阻在线辨识,该方案的优点是系统简单,解决了低速运行时电压模型的定子电阻变化对系统稳定性和速度控制精度的影响问题。数字仿真和实验结果验证了定子电阻在线辨识的必要性和该方案的有效性。 相似文献
5.
J TAKAHASHI K KAGEYAMA T FUJII T YAMADA K KODAIRA 《Journal of Materials Science: Materials in Electronics》1997,8(2):79-84
The Sr(Ga0.5Ta0.5)O3-based perovskites with O2- and/or Sr2+ vacancies were formed by changing the A-site and/or B-site cation
ratios. The Sr-deficient perovskites with a limited composition of Sr0.86(Ga0.36Ta0.64)O3 could be obtained, whereas oxygen
vacancies were hardly created. The B′-site Ga3+ cation could be replaced with large Sc3+, In3+, Y3+, Nd3+ and La3+. The crystal
symmetry of the complex perovskites changed from cubic (B′=Ga3+, Sc3+, In3+) to tetragonal (B′=La3+) through rhombohedral
(B′=Y3+, Nd3+). The dielectric permittivities of these ceramics indicated no distinct dependence on the B′-site cation species.
The temperature coefficient of permittivity might be associated with the symmetry change of the perovskite phases. Higher
microwave Qf values, >Qf=38 000 GHz, were obtained for our complex perovskite ceramics, except with B′=La3+.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
6.
Qing-qing LU Takuto KANETSUKI Shin-ichi YAMASAKI Ryoichi YAMADA Takahiro WATANABE Noriyoshi TSUCHIYA 《中国有色金属学会会刊》2014,24(6):1880-1889
Focusing on the origin of the heavy metal, this study aims to build an imputed method to estimate the heavy metal content in river water by making a distinction between the heavy metal of natural origins and that caused by human activities. Supported by GIS, Kosaka watershed within the Hokuroku basin was divided into several sub-watershed polygons and the outflows of water and Cu were calculated for each polygon. Compared with the natural origin, the dominant Cu emissions affected the river water more significantly in local. Based on the mass balance closure, the heavy metal content of Cu in the Kosaka River was estimated by the conflux accumulation of tributaries and mine drainages. The estimated Cu concentrations were checked by comparing with the actually measured values at monitoring points along the Kosaka River and the results are coincidence with each other in general. It is revealed that the mainstream water quality could be estimated by seizing the water quality of upstream tributaries and human drainages. 相似文献
7.
FATIGUE CRACK PROPAGATION IN BIAXIAL STRESS FIELDS 总被引:1,自引:0,他引:1
K. TANAKA T. HOSHIDE A. YAMADA S. TAIRA 《Fatigue & Fracture of Engineering Materials & Structures》1979,2(2):181-194
Abstract Biaxial tension-compression fatigue tests were conducted with cruciform shaped specimens in a closed-loop servo hydraulic testing machine. The effects of static and cyclic non-singular stresses acting parallel to the crack plane on the crack growth rate are discussed based on the experimental observations of crack opening behaviour and fractography. Those non-singular stresses did affect the growth rate significantly under certain conditions. The range of crack-tip opening displacement was found to be a better parameter in correlating the growth rate than the stress intensity range or its effective range. The rate tended to increase with increasing non-singular stress which is correlated to the opening displacement range. This tendency was explained by the shift of fracture mechanisms to a more brittle type due to a higher elevation of hydrostatic stress near the crack tip for the case of a larger non-singular stress term. 相似文献
8.
Microparticulation by Jet Mill Grinding of Protein Powders and Effects on Hydrophobicity 总被引:4,自引:0,他引:4
A method was studied for microparticulation of protein for use as fat substitutes by superfine grinding. A jet mill produced particles <3 μm from egg white, casein and soybean hull. Microparticulation by grinding of egg white was easier than with casein or soybean hull. Hydrophobicity of casein increased by grinding to super fine particles but little or no effect was observed on soybean hull and egg white. 相似文献
9.
河野久征 《分析测试仪器通讯》1996,6(2):82-89
采用m样品:m熔剂为1:2的低稀释比玻璃熔融技术,X射线荧光法测定岩石中的主成分和微量成分,既提高了灵敏度又不均质效应。与粉末压片方法相比,对硫的分析得到了更好的结果。同时,使用基本参数程序建立了一种新的校正方法来校正由于烧失量、烧增量、释释比或熔剂挥发而导致的分析误差。 相似文献
10.