Electrical engineers to study the main technical points of the permanent magnet generator

1 magnetic circuit structure and the design calculation The biggest difference between permanent magnet generator and electrical excitation generator excitation magnetic field is that it is produced by the permanent magnet. In permanent magnet motor is a magnetic source, and part of the magnetic circuit. Magnetism of permanent magnet can not only associated perkins diesel generator with the manufacturing process of production, and also the shape and size of the permanent magnet, the magnetization machine capacity and the magnetization method, the specific performance data discreteness is very big. In motor and permanent magnet flux and provided by the magnetomotive force also varies with the magnetic circuit of the rest of the material performance, size and motor running state. In addition, the magnetic circuit structure of the motor vehicle spare parts permanent magnet generator is varied, leakage magnetic circuit is very complicated and the share of magnetic flux leakage is bigger. Part of the ferromagnetic materials and is easier to saturation, permeability is nonlinear. These have increased the complexity of the permanent magnet generator electromagnetic calculation, the accuracy of the calculation results under electrical excitation generator. Therefore, it is necessary to establish new design concept, to improve the magnetic circuit structure and control system and analyze; Must be applied in modern design method, the new methods of analysis and calculation, improve the accuracy of design calculation; Must study the advanced test method and manufacturing process. 

2 control problem (see electrical engineer) pointed out that after the permanent magnet generator is made without external www.dongfeng-motor.com energy can maintain its magnetic field, but also from external regulation, control of its magnetic field is extremely difficult. These make the application range is limited by the permanent magnet generator. But as MOSFET and IGBT power electronic devices such as the rapid development of control technology, can not control the magnetic field in the application of permanent magnet generator and motor output control, only when the design needs to be ndfeb material, three new power electronic devices and computer control technology, the permanent magnet generator run under new conditions. 3 the irreversible demagnetization If improper use or design, the permanent magnet generator in high (ndfeb permanent magnet) or low (ferrite permanent magnet) temperature, under the effects of the armature reaction current impulse, or in severe mechanical vibration that may produce irreversible retreat (or called excitation-loss), reduce the motor performance, can't even use. Thus both the research and development is suitable for motor manufacturers use inspection of the permanent magnet material thermal stability of the method and device, and to analyze the structure of various forms of resistance to demagnetization ability, in order to make the design and manufacturing, to ensure permanent magnet generator with magnetic. 4 cost problem Because of rare earth permanent magnet materials at present the price is more expensive, the cost of rare earth permanent magnet generator generally higher than the electrical excitation generator, the need to use its high performance and operating cost savings to compensate. When the design should not only according to the requirements of specific use situation, performance, price comparison to choose, and must carry on the structure of the process of innovation and design optimization in order to reduce costs.