Development of a high-efficiency and low-loss motor considering the two-dimensional (vector) magnetic properties

本研究针对磁性材料的二维磁场特性，即磁场强度矢量与磁场强度矢量之间的关系，开发了一种新型高效低损耗电机。利用自行研制的矢量磁滞分析仪测量了取向硅钢片等电工钢的矢量特性。为了将矢量磁特性引入到磁场分析中，我们提出了E&SS模型作为有限元分析中的一种数值模型。利用这种方法，我们得到了一些定子铁心结构模型中的损耗分布。结果表明，在电机铁心使用中，由于旋转功率损耗增大，旋转磁通轨迹轴比(短轴分量与长轴分量之比)应小于0.3，磁通密度矢量与铁心材料易磁化轴的倾角应小于30度。在恒励磁条件下，一次回路的阻抗随磁导率的增加而增大，仅用优质材料替代传统的无取向材料很难获得良好的性能。为了在高效电机的设计中保持高磁密条件，有必要发展一种利用高励磁电压和恒流条件的新的设计方法。

This research has been carried out to develop a new high-efficient and low-loss motor considering the two-dimensional magnetic properties, which is the relationship between the magnetic field intensity vector and the magnetic field strength vector in magnetic materials. The vector properties for the electrical steel sheets such as the oriented silicon steel sheets were measured by means of the vector hysteresis analyzer developed in our laboratory. To introduce the vector magnetic properties into the magnetic field analysis, we have proposed the E&SS modeling as a numerical modeling used in the finite element analysis. By using this approach we have made clear loss distributions in some stator core construction models. As a result, it was shown that the axis ratio of the rotating flux loci (the ratio of the minor axis component with respect to the major axis component) should be lower than 0.3 and the incline angle of the flux density vector from the magnetizing easy axis of the core material should be less than 30 degrees, in the use of the motor core due to increasing rotational power losses.It was difficult to obtain a good performance by only replacing the conventional non-oriented material with a high-grade material, because the impedance of the primary circuit increased with the increase of the permeability under the constant exciting voltage conditions. To keep high-flux density conditions in the designing of a high-efficiency motor, it is necessary to develop a new designing method in the use of high exciting voltages and constant current conditions.