working principle:
A hydroelectric generator is a device that converts mechanical energy into electrical energy. The rotor is driven to rotate by the hydraulic turbine, and the coils in the stator move relative to the magnetic field of the rotor to generate induced electromotive force and current, thereby converting mechanical energy into electrical energy.
Features and advantages of permanent magnet hydroelectric generators:
1. The permanent magnet generator rotor adopts rare earth permanent magnet steel, no external excitation, no carbon brush, no sparks, no excitation winding, high motor rotor strength, no excitation control box, high generator efficiency, compact structure, and reliability. The volume-to-weight ratio of the electric excitation generator with the same parameters is reduced by 30%, which reduces the construction cost.
2. Low-speed permanent magnet generators can output higher voltages at low speeds, eliminating the need for gearbox speed-ups, etc. The fan directly drives the generators to improve system efficiency. Permanent magnet generators are suitable for variable-speed operation of wind power generation. They are durable and not easy to be damaged. They operate efficiently in the entire speed range. With a wind power controller and inverter, perfect protection and automatic grid connection can be realized.
3. Protection level: IP54, to prevent water, mud, and dust from entering the inside of the motor, and has a long service life. It is especially suitable for field needs. It is widely used in wind power, hydropower, ocean power, and other new energy power generation occasions.
4. The motor is air-cooled or water-cooled, and the temperature is low. The motor uses imported oil-containing bearings, maintenance-free, high reliability, and long life. The motor voltage, speed, power, and other parameters can be changed according to the needs, and the generator can be made into a horizontal or horizontal type. It can use spline shaft extension, double shaft extension, front end stop output, etc., and can be treated with three preventions.
The difference between a permanent magnet hydroelectric generator and an excitation generator is that its excitation magnetic field is generated by a permanent magnet. The permanent magnet is both a magnetic source and a component of the magnetic circuit in the motor. The magnetic performance of the permanent magnet is not only related to the manufacturing process of the manufacturer, but also related to the shape and size of the permanent magnet, the capacity of the magnetizer and the magnetizing method, and the specific performance data is very discrete. Moreover, the magnetic flux and magnetomotive force that the permanent magnet can provide in the motor also vary with the material properties, size, and motor operating state of the rest of the magnetic circuit. In addition, the magnetic circuit structure of the permanent magnet generator is diverse, the leakage magnetic circuit is very complicated and the leakage magnetic flux accounts for a large proportion, the ferromagnetic material part is relatively easy to saturate, and the magnetic permeability is nonlinear. These all increase the complexity of the electromagnetic calculation of permanent magnet generators, making the accuracy of the calculation results lower than that of electrically excited generators. Therefore, it is necessary to establish a new design concept, re-analyze and improve the magnetic circuit structure and control system; it is necessary to apply modern design methods and research new analysis and calculation methods to improve the accuracy of design calculations; it is necessary to study the use of advanced testing methods and manufacturing craft.