OPTIMAL WINDING DESIGN OF A PERMANENT MAGNET MOTOR FOR SELF-CONTROLLED INVERTER OPERATION

ABSTRACT

This paper describes a novel design of the three-phase synchronous motor which is tailored to match the operational characteristics of the self-controlled inverter. The design is based on a square waveform distribution of the rotor radial B-fields and square waveform distributions of the winding densities of the stator phases around the periphery of the airgap. The motoring torque has minimal time harmonics. The design achieves a maximum power density for the frame size of the motor. It is ideally suited for permanent magnet synchronous motors.     

大豆卵磷脂对超级棕榈液油氧化稳定性的影响

分析了不同比例大豆卵磷脂加入到超级棕榈液油中油脂过氧化值的变化情况,以期研究大豆卵磷脂在超级棕榈液油中的抗氧化性能。采用Schaal烘箱加速氧化法研究了大豆卵磷脂对超级棕榈液油过氧化值的影响;根据Arrhenius经验公式,推测其保质期;并利用Rancimat法测试氧化诱导期。研究表明:大豆卵磷脂对超级棕榈液油的抗氧化能力有剂量效应关系,随着大豆卵磷脂浓度的增加,体系反应活化能增加,氧化反应速率降低,与空白油样相比,添加1.00%大豆卵磷脂,其体系的反应活化能增加5.84 k J/mol。根据推测的公式计算出20℃下,体系初始过氧化值为1 meq/kg时的保质期,添加1.00%大豆卵磷脂,超级棕榈液油的保质期可以增加7个月。根据诱导期计算抗氧化系数,其值介于1~2之间,说明大豆卵磷脂具有较好的抗氧化能力,是一种优良的天然抗氧化剂。      

棕榈油部分替代猪板油及其相容性研究

选用棕榈液油(OL)与棕榈硬脂(ST)部分替代猪板油,对其理化性质及相容性进行分析,并使用欧式距离法确定复配棕榈油替代猪板油配方。结果表明:棕榈油替代猪板油在理化性质、健康方面具有明显的优势;棕榈油与猪板油之间的相容性与温度和质量分数有密切的关系,整体来看,二元体系低温下易出现偏晶现象,高温下易出现共晶现象,温度越低,相容性越差,温度在35~40℃之间时,相容性较好;通过相似度比较得出,质量分数为30%的ST和70%的OL复配时,可以作为部分替代猪板油的配方。     

DIFFERENT ARRANGEMENT OF ɛ-(γ-GLUTAMYL)LYSINE CROSS-LINKING IN ALASKA POLLOCK (THERAGRA CHALCOGRAMMA) SURIMI PROTEINS BY STREPTOVERTICILLIUM AND ENDOGENOUS TRANSGLUTAMINASES DURING SUWARI PROCESS

The objective of the present study is to compare the protein cross‐linking reaction in Alaska pollock surimi that is catalyzed by a commercially available microbial transglutaminase and by endogenous Alaska pollock transglutaminase. The endogenous transglutaminase was inhibited by EGTA and activated by CaCl₂ The microbial transglutaminase was added to the salted surimi with and without EGTA and CaCl₂. These surimi pastes were incubated at 25C up to 24 h followed by cooking at 90C. The resultant gels were fractionated into soluble and insoluble (aggregate) fractions by SDS‐urea extraction. Compositional analysis revealed that the aggregate consisted predominantly of cross‐linked myosin heavy chain. The distribution of ?‐(γ‐glutamyl)lysine isopeptide in the soluble and aggregate fractions andpeptide mapping analyses of the aggregate fraction demonstrate that the formation of isopeptide cross‐links in Alaska pollock surimi proteins during suwari process differs when catalyzed by the microbial transglutaminase and endogenous transglutaminase.     

Coupled Analysis by Viscoelastic Body with Rigid Body for Design of MRE Soft Actuator

The magneto rheological elastomer (MRE) is composed of silicone elastomers and ferromagnetic powders that are responsible for its ferromagnetic and viscoelastic properties. The shape and the stiffness of the MRE change depending on the magnetic field. Therefore, it is expected to be used for artificial muscle or damping material. We developed a coupled analysis method by combining the moving particle semi‐implicit/simulation (MPS) method with the finite element method (FEM) for the design of the MRE actuator. However, this method does not take into account a rigid body. Therefore, when analyzing the coil embedded in the MRE, it was difficult to calculate parameters such as the coil rotation and position. Therefore, this paper presents a numerical method for MRE actuator analysis by coupling MPS method with FEM to arrive at a calculation method for a rigid body. The numerical algorithm is described and the calculated results are shown.     

Analytical Method Applying a Mathematical Model for Axial‐Gap‐Switched Reluctance Motor

In this paper, an analytical method using a mathematical model for switched reluctance motors (SR motors) is proposed. The feature of this method is the representation of the effect of the mutual flux on the integral model by applying transient analysis utilizing preprocessed inductance tables. The advantage of this method is that the analysis time is reduced in comparison with the finite element method (FEM). The calculation results for the torque show little difference between the FEM and the proposed method, and the computation time was shortened. A 3.7‐kW prototype axial‐gap SR motor designed using the proposed method delivered the specified performance.     

STIFFNESS AND DAMPING MATRICES IN FREE-BODY TRANSLATIONAL ELECTROMECHANICS

ABSTRACT

Mathematical consistency requires three-dimensional translational electromechanics to be characterized by stiffness and damping matrices (order 3×3). This paper offers a physical interpretation to these matrices. It is shown that their eigenvalues yield the stiffness and damping constants and their eigenvectors yield information as to the orientations of their axes.

It is proved that the stiffness matrix is symmetric as a consequence of conservativeness     

LITHIUM-ION SIEVE PROPERTY OF λ;-TYPE MANGANESE OXIDE

The adsorptive properties of A-Mn0₂for mono and divalent metal ions were investigated by pH titration and by measurements of the distribution coefficients(Kd's) of the metal ions. The pH titration curve showed an apparently monobasic acid type for a H⁺-Li⁺exchange. Those for H⁺-K⁺and H⁺-Cs⁺exchanges were nearly the same as that for blank titration. The lithium ion uptake increased with increasing solution pH and reached 5 meq/g at pH 11. X-ray diffraction analyses showed that the adsorption of lithium ions caused an increase in the lattice constant of a cubic unit cell. The potassium and cesium ion uptakes were nearly zero over a pH range between 4 and 11. A-Mn0₂showed a remarkably high Kd value for lithium ions, compared to a cation exchange resin. The selectivity sequences were Na⁺< K⁺< Rb⁺< Cs⁺<< Li⁺for alkali metal ions, Mg²⁺< Ca²⁺< Sr²⁺< Ba²⁺for alkaline earth metal ions, and Ni²⁺< Zn²⁺< Co²⁺< Cu²⁺for transition metal ions.     

以红棕油为基料油的营养调和油研制

依据2013年中国营养学会推荐的脂肪酸摄入量的要求,以脂肪酸平衡和营养物质的含量为评价指标,使用红棕油为调和油的关键基料油,添加富含生理活性物质较多的稻米油、橄榄油、胡麻油,制备出4种不同比例的红棕调和油,通过气相色谱仪和高效液相色谱仪检测调和油中的脂肪酸组成和营养成分,结果表明:4种调和油中脂肪酸比例均符合中国营养学会推荐的脂肪酸摄入量的要求,且调和油中还含有丰富的β-胡萝卜素、γ-谷维素、角鲨烯、生育酚与生育三烯酚和植物甾醇。因此,4种红棕调和油是营养的调和油,为其它营养调和油的研制提供了参考。