Loss and temperature rise are important parameters for performance evaluation of bearingless switched reluctance machine. In this paper, a 12/8 outer-rotor single-winding bearingless switched reluctance motor (SWBSRM) is studied for its loss and temperature rise under high speed operation. Firstly, a 2D finite element model is established by using Ansoft Maxwell, and the magnetic flux density waveform and the variation law of different parts of the core are obtained. Furthermore, various losses including core loss and copper loss are coupled to the temperature field analysis module as a heat source. Thirdly, the thermal model is established by Motor-CAD, and the transient and stable temperature field is simulated and analyzed. Finally, the temperature field distributions of the core and windings are obtained.

Optimization design is a satisfactory way to improve the performance of magnetic bearing (MB). In this paper, a multi-objective genetic algorithm of particle swarm optimization (GAPSO) is proposed for homopolar permanent magnet biased magnetic bearings (HPRMBs). By assigning different inertia weights to each objective function, the multi-objective function is transformed into a new single objective function for optimization. In order to ensure the diversity of particles in the optimization process, genetic algorithm is used to cross-mutate them, which enhances the global search ability of particle swarm optimization. After optimization with GAPSO, the levitating force of the MB is increased by 22.3%, the volume decreased by 26.6%, and the loss reduced by 33.9%. The optimization results show that the multi-objective optimization based on GAPSO can effectively improve the performance of HPRMB.

The vibration and noise problems caused by the radial electromagnetic force of the Bearingless Switched Reluctance Motor (BSRM) severely restrict its wide application. The purpose of this paper is to research the electromagnetic vibration and noise of Single-Winding Bearingless Switched Reluctance Machine (SWBSRM). Firstly, the radial electromagnetic force, which is the excitation source of electromagnetic vibration, is analyzed. Secondly, the three-dimensional (3D) model of stator structure is established by ANSYS finite element analysis (FEA) software, and its modal analysis is carried out to obtain its modal shape and corresponding modal frequency, which provides a reference and basis for researching the mechanical vibration of the SWBSRM. Finally, the harmonic response field analysis and sound field analysis model are established, and the vibration and noise of the motor under radial electromagnetic force are analyzed by using the magnetic-solid weak coupling analysis method.

Traditionally, ordinary low-specific speed centrifugal pumps are subject to overloading of their driving motors. A type of non-overload low-specific speed centrifugal pump was put forward and widely accepted. But its internal flow field remained unknown. In this paper, by letting the distance and the angle between the points on the wall and the first corresponding internal points be constants, the generated grid is proven friendly to introduce the boundary conditions when wall function approach is used. Through using the k-ε turbulent model modified to consider the curvature and rotation, applying SIMPLE-C algorithm to make pressure-velocity correction equations, utilizing Alternative Direction Implicit method to solve linear equations, the 3-D incompressible turbulent flow in the impeller of a non-overload centrifugal pump is computed. It shows there are differences between ordinary pump and this kind of pump though they share some common characteristics. There are back flow at the inlet and secondary flow near the outlet with the non-overload pump, which explains why the efficiency is a little lower to secure the motor. The research will be supportive to the optimal design of non-overload centrifugal pumps on the basis of flow field calculation.

采用椭圆型微分方程法进行离心泵叶轮三维贴体网格的自动生成,可以满足网格非均匀性和网格大小可人为改变等条件.在生成网格时给定边界上的点与第一内点的距离以及两者连线与壁面曲线间夹角的边界条件,能使在湍流计算中广泛应用的壁面函数法的条件容易满足,并能使普遍采用的压力第二边界条件直接用于计算中,还能满足差分要求,减小离散误差.

在旋流泵流场计算及流场测试基础上 ,就旋流泵的结构参数对泵性能的影响进行了一系列试验研究 ,总结了以蜗壳无叶腔体积 V0 与叶轮体积 VI 之比 ZV 来设计旋流泵的方法 ,并由大量试验数据统计得到 ,当ZV=V0 /VI=3～ 5时可获得较好的水力性能。设计的几种旋流泵的效率比国内外同类产品提高了 3%～ 5 %