新型转子内置式永磁同步电机设计与优化

目的为了提高车用内置式永磁同步电机运行性能,改善市面上常见车用“V”型内置式永磁同步电机谐波畸变,转矩脉动等问题。方法提出一种新型内置式永磁同步电机设计方法,结合车用内置式永磁同步电机设计指标与基本理论计算出电机主要尺寸,利用有限元仿真软件建立电机模型,分析了新型转子内置式永磁同步电机工况下的运行性能,并采用参数化扫描的方法对电机定转子开不同尺寸槽的齿槽转矩进行了研究,同时,为了提高电机的优化效果,对电机参数进行灵敏度分析,找出影响电机性能的主要变量,并进行分层多目标优化。结果仿真结果表明,新型转子内置式永磁同步电机在抑制反电势谐波畸变,削弱电机转矩脉动和减少电机损耗的方面要更加优秀;其次,通过在电机定转子上开辅助槽可以有效减小新型转子内置式永磁同步电机的齿槽转矩;最后,相比于电机的单层多目标优化,分层多目标优化可以获得更贴近实际使用需要的设计参数。结论所设计的新型转子内置式永磁同步电机要比“V”型内置式永磁同步电机更能满足目前新能源汽车内置式永磁同步电机高性能的要求,上述研究结果为车用内置式永磁同步电机的设计提供了参考依据。

盐湖卤水中铷离子的分析方法研究进展

铷是一种稀有金属元素,其用途广泛,在我国盐湖卤水中储量丰富。文章重点介绍了盐湖卤水中铷的分析方法,探讨了原子吸收光谱法、原子发射光谱法、电感耦合等离子体质谱法(ICP-MS法)、X射线荧光光谱法、离子色谱法等仪器分析法在盐湖卤水铷离子分析中的应用,并对各方法的优缺点进行了比较。

全钢子午线轮胎钢丝粘合胶混炼工艺温度的探讨

以不溶性硫黄的分散性为重点,对全钢子午线轮胎钢丝粘合胶[主体材料为天然橡胶(NR)]的混炼工艺温度进行研究。结果表明:钢丝粘合胶的混炼工艺温度适当,NR与不溶性硫黄均熔融且粘度接近,混炼剪切力较大,NR与不溶性硫黄大分子均处于"整链"运动状态,不溶性硫黄分散性较好;不溶性硫黄HD OT20钢丝粘合胶大配合试验混炼排胶温度控制为106℃时,胶料的表面粘合性能和物理性能较好,尤其是H抽出力较大。

Seasonal variations of phosphorus species in the Tuohe River, China. Part Ⅰ. Sediments

Sediment cores were collected at an upstream site(Jintang) and a downstream site(Neijiang) in summer and winter in the Tuohe River, which is one of the five largest tributaries of the Changjiang(Yangtze) River in China. A sequential leaching procedure was applied to determine the concentrations of the different forms of solid phosphorus, including exchangeable phosphorus(Exc-P) as well as phosphorus associated with iron oxides(Fe-P), with aluminum oxides(Al-P), with apatite(Ca-P) and with the residual fraction(Res-P), as correlated with water content and total organic carbon. The seasonal variations and the vertical distributions of phosphorus species in sediments at both sampling sites demonstrated that: 1) total phosphorus(TP) in summer and winter were ranged between 1 313–2 330, 1 491–2 228 mg/kg in Jintang and 543–2 128, 603–1 175 mg/kg in Neijiang, respectively. It can predicated the pollution of TP in Jintang is serious than that in Neijiang both in summer and winter; 2) total inorganic phosphorus(TIP) was the dominant form of TP; 3) Ca-P was the main chemical forms of TIP in the sediments. Based on the profiles in sediments and bio-available phosphorus data, it revealed that bio-available phosphorus(BAP) represented only a minor portion(0.61%–3.59%) of TP, and the vertical distribution of soluble reactive phosphorus(SRP) in corresponding porewaters was more abundant in the upper layer of the sediment, which suggests that BAP may be converted to non-bioavailable phosphorus in deeper layer of the sediment of this dynamic system.

Antimony speciation at the sediment-water interface of the Poyang Lake: response to seasonal variation

In order to identify the effects of seasonal variation on the migration and transformation of antimony species at the sediment-water interface of the Poyang Lake, the largest fresh lake in China, a simulation study was carried out in the laboratory. Antimony species including antimonite Sb(III), antimonate Sb(V) and the fraction of organic forms(Sb-org) in overlying water at different temperatures were regularly measured during the simulation period. Different bound antimony forms in sediments were also determined along with the different antimony species in porewaters after the simulation terminated. The results indicated that temperature change during seasonal alternation plays an important role in the migration and transformation behavior of antimony at the sediment-water interface of the Poyang Lake. Antimony species both in porewaters and overlying water were sensitive to the variation of temperature, especially the Sb-org species. Antimony migrates from porewaters to the overlying water when the temperature decreases, and meanwhile the equilibrium between Sb(III) and Sb(V) in porewaters shifts toward Sb(V) when the temperature increases during seasonal alternation. Although temperature had less influence on the antimony species in sediments than in porewaters or in the overlying water, the average content of each antimony species in sediments increased with the decrease of temperature, suggesting that the decrease of temperature causes enrichment of antimony in the sediment.

Phase Equilibrium and Phase Diagram of the Ternary System（MgCl2 + MgB2O4 + H2O） at 288 and 298 K

1 Introduction The brines with high concentrations of magnesium and boron resources are widely distributed in the Qaidam Basin of the Qinghai-Tibet plateau,China(Zheng&Tang,1988).Although some works on the ternary system

Synthesis and Characterization of Sodium Pentaborate Pentahydrate

1 Introduction Sodium borates as important raw materials are widely used in the field of glass industry,ceramic industry,medical industry,paper industry,agriculture and so on for

Phase Equilibria of the Aqueous Systems Containing Lithium and Carbonate Ions

1 Introduction Alkaline lakes are widely distributed in the area of the Qinghai-Tibet Plateau.Most of the salt lakes are famous for their high concentration of lithium,potassium,magnesium,boron(Ma,2000).In recent years,as a new energy material,lithium and its compounds are widely used in the new area,such as aerospace industry,nuclear

Lithium Ion Extraction from the High Ration Mg/Li Salt Lake Brine with Ionic Liquid in Triisobutyl Phosphate and Kerosene

1 Introduction As the lightest metal with the unique properties of energy production and storage,lithium is regarded as the new century energy metal.Lithium and its compounds were widely used in various industrial fields,especially in

Processes on the Thermodynamic Properties of Lithium Borates

1 Introduction Lithium and its compounds as national strategic resources are extensively used in national defense,industrial and agricultural production.As we know,the salt lakes in the western of China are famous for its high

Studies on the Thermodynamics and Thermal Chemistry Properties for Lithium Salts and Their Aqueous Solution Systems

1 Introduction With the industrial development of lithium battery,nuclear and aerospace industry,the demands of metal lithium and its compounds are increasing significantly.Lithium is called as the energy of the metal in the new century(Zhang et al.2001).The total reserve of lithium resources around the world7

Theoritical and Experimental Studies on the Phase Equilibria and Phase Diagrams on the Salt-Water Systems

1 Introduction Salt lakes are widely distributed in the world,and salt lakes in China are mainly located in the area of the Qinghai-Xizang(Tibet),and the Autonomous Regions of Xinjiang and Inner Mongolia.There are more than 700salt lakes,each with an area larger than 1 km2,in the

Determination of Acidolysis Hydrocarbons in Oil/Gas Geochemical Exploration Sample By Gas Chromatograph

1 Introduction Although a mumerous of papers were reported for the chemcial or instrumental analysis of inorganic elements for the geocheical samples(Sun and Xie,2014;Sun et al.,2014;Rao et al.,2004).However,the analytical methods

Synthesis and Characterization of an Extractant [Bmim]PF_6 for Lithium Ion

With the rapid increasing demand of metal lithium and its compounds in science and technology,studies on lithium recovery though lithium ion extraction from salt lake brines are blooming bacause more than 60 percent of

Predictive phase equilibria for the aqueous ternary system(Li_2SO_4 + K_2SO_4 + H_2O) from 273.15 to 373.15 K

1 Introduction Many variable temperature chemical models were developed to predict mineral solubility in the natural waters(Na+,K+,Ca2+,Mg2+//Cl-,SO42-–H2O)in the temperature range below 298.15 K(to near 213.15 K)and(Na+,K+,

Application of Dibenzo-21-Crown-7 for Cesium Extraction from Geothermal Water

Cesium as a kind of alkali metals has widely been used in catalysis,medicine,biology,magnetic fluid power and other high-tech fields(Liao and Yang,2012;Cao et al.,2011;Wang et al.,2011).Although there was abundant of

Phase Equilibria of Salt-water Systems Containing Magnesium and Borate Ions

1 Introduction A salt lake is a naturally occurring complex body of water and salt interaction.More than 700 salt lakes are widely distributed in the area of the Qinghai-Tibet Plateau.Most of the salt lakes are famous for their abundance of lithium,potassium,magnesium,and boron resources.It is

A Rapid Synthetic Method for Inderite

1 Introduction There are many different magnesium borates synthesized from various conditions or acquired naturally with different compositions,which can be used in a wide range of fields.Their applications involve ceramic

Solid–liquid Phase Equilibria in the Aqueous Ternary System Containing Lithium,Potassium,and Sulfate ions at 288.15 K

1 Introduction Salt lakes are widely distributed in the western of China,especially in the area of Qinghai-Xizang(Tibet)Plateau.A series of salt lakes in the Qaidam Basin,located in Qinghai Province,China,is famous for their abundance of lithium,potassium and boron resources(Zheng et al,1988;Deng et al,2012).It is well known that the

Experiment and Pitzer Model Prediction for the Solid + Liquid Equilibria of the Ternary System LiCl–CaCl_2–H_2O

1 Introduction Lithium resources are widely distributed in the oilfield brine from the Nanyishan district in the Qaidam Basin(Fan et al.,2007).The investigation of the thermodynamics and phase diagram of the brine system is valuable in providing the theoretic foundation and scientific guidance in the comprehensive exploitation of the mixture salts effectively.Comprehensive