VFD is a power control device that uses frequency conversion technology and microelectronics technology to control AC motors by changing the frequency of the motor's working power supply.
The permanent magnet motor variable speed system has been used in the elevator market for almost 10 years.
Using pelton turbines to generate electricity, the output range can be from 50kW to 500MW, which can be applied to a larger head range of 30 meters to 3000 meters, especially in the high head range.
The brushless DC motor is also a permanent magnet synchronous motor, and the speed regulation actually belongs to the category of variable voltage and frequency conversion speed regulation.
1. Axial flow type/metal pressed axial flow type-widely used in low-head and large-flow rivers; 2. Francis-Francis turbine has a compact structure, high efficiency, and can adapt to a wide range of the head range, is one of the water turbine models widely used in countries all over the world. 3. Tubular type-the structure is similar to the axial flow type; 4. Inclined type-suitable for small power stations with medium and high water heads and small flow. The structure is compact and there is no draft tube, which can reduce the height of the plant and reduce the opening digging depth to reduce plant construction costs; 5. Pelton type -is used for higher water head and smaller flow, the impact type has a compact structure and no draft tube, which can reduce the height of the plant and reduce the depth of excavation to reduce the construction of the plant cost.
A water turbine is a hydraulic machine that converts water energy into mechanical energy. It is a device that uses a hydroelectric machine to drive a generator to convert rotating mechanical energy into electrical energy, which is called a hydropower generator set. According to the characteristics of water flow energy conversion, water turbines can be divided into: counterattack type and pelton type.
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