Permanent Magnet Generator is a combination of modern materials science, electronic power science products. The Permanent Magnet Generator has the advantages of simple structure, reliable operation, small volume, light weight, small loss and high efficiency, so the Permanent Magnet Generator has the advantages of simple structure, reliable operation, Years of rapid development.
First, the structure is simple, high reliability
Permanent magnet generator eliminates the need for excitation generator rotor winding and other structures, to avoid the rotor winding easy to burn, broken and other failures, greatly improved reliability.
Second, small size, light weight, than the power
The use of permanent magnet rotor structure, so that the internal structure of the generator design is very compact, volume, weight greatly reduced. Permanent magnet rotor structure is simple, but also to reduce the rotor inertia, practical speed increases, the specific power (ie, power, volume ratio) to a high value.
Third, medium and low speed generator performance is good
Power level of the same circumstances, the idle when the permanent magnet generator than the excitation generator output power twice as high.
Four, high efficiency
Permanent magnet generator is an energy-saving products, permanent magnet rotor structure eliminates the need to produce the rotor magnetic field required mechanical losses, making permanent magnet generator efficiency greatly improved.
Fifth, the use of self-starting regulator
No external excitation power supply, the generator can rotate as long as power generation.
Six, the work environment to adapt to strong
Permanent magnet generators are particularly suitable for harsh or dusty harsh environments, and the ability to adapt to the environment is strong.
The biggest difference between a permanent magnet generator and an excitation generator is that its field magnetic field is generated by the permanent magnet. Permanent magnet in the motor is both a magnetic source, but also a part of the magnetic circuit. The magnetic properties of the permanent magnet are not only related to the manufacturing process of the manufacturing plant, but also to the shape and size of the permanent magnet, the capacity of the magnetizing machine and the method of magnetizing, and the specificity of the performance data is very large. And the magnetic flux and magnetomotive force that the permanent magnet can provide in the motor also change with the material performance, the size and the motor running state of the rest of the magnetic circuit. In addition, the permanent magnet generator magnetic circuit structure varied, leakage magnetic circuit is very complex and large proportion of leakage magnetic flux, ferromagnetic material part is relatively easy to saturation, the magnetic guide is non-linear. These have increased the complexity of the permanent magnet generator electromagnetic calculation, so that the accuracy of the calculation results is lower than the electric excitation generator. Therefore, it is necessary to establish a new design concept, to reanalyze and improve the magnetic circuit structure and control system; must use modern design methods to study the new analytical methods to improve the accuracy of design calculations; must study the use of advanced testing methods and manufacturing Process.
Permanent magnet generator made without external energy to maintain its magnetic field, but also caused by external regulation, control of its magnetic field is extremely difficult. These have limited the scope of application of permanent magnet generators. However, with the mosFET, IGBTT and other power electronic devices, the rapid development of control technology, permanent magnet generator in the application without magnetic field control and only the motor output control. Designed to require NdFeB materials, power electronic devices and computer control of three new technologies together, so that permanent magnet generators in a new operating conditions.
If the design and use of improper, permanent magnet generator in the high temperature (NdFeB permanent magnet) or too low (ferrite permanent magnet), the impact of the current generated by the armature reaction, or in the severe mechanical vibration When it is possible to produce irreversible demagnetization, or called loss of magnetic, so that motor performance is reduced, or even can not be used. Therefore, it is necessary to study and develop the methods and apparatus for inspecting the thermal stability of permanent magnetic materials for use in motor manufacturers, and to analyze the anti-demagnetization capability of various structural forms in order to ensure that the use of the corresponding measures in the design and manufacture The magnetic generator does not lose its magnetism.