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Applications of electric motors
Category: Company News
Electric Power Industry
I. Steam Turbine Generator
Steam turbines generators are used in thermal and nuclear power plants. They are a type of synchronous motor. Due to the high rotational speed of the prime mover—typically 3,000 r/min—the rotors of steam turbine generators are slender and elongated, designed to minimize linear velocity. Currently, the largest steam turbine generators worldwide have exceeded a capacity of 1 million kilowatts.
II. Hydroelectric Generator
Hydroelectric generators are used in hydroelectric power plants and are a type of synchronous generator. Due to the relatively low rotational speed of the prime mover (the turbine)—typically below several hundred revolutions per minute—the rotor of a hydroelectric generator is designed to be robust and compact, with a higher number of poles. Figure 2-12 illustrates a hydroelectric generator installed at the Three Gorges Power Station. The Three Gorges generating units represent the largest hydroelectric generator sets in the world today, each capable of delivering up to 700,000 kilowatts of power. In total, the Three Gorges Power Station features 26 installed generating units, with each unit having a single-unit capacity of 700,000 kilowatts.
III. Wind Turbines
Wind power generation is the process of converting wind energy into mechanical energy through the rotor blades of wind-capturing devices, and then transforming this mechanical energy into electrical energy. Wind energy is one of the most cost-effective, cleanest, and most promising new energy sources with significant development potential. Over the past decade or so, the Chinese government has accelerated the development of wind power, introducing advanced, large-scale wind turbines manufactured abroad. These have been integrated into wind farms, effectively promoting the growth of China's wind power industry.
According to installed capacity, wind turbines are categorized into small, medium, large, and ultra-large series. Small wind turbines have a capacity ranging from 0.1 to 1 kW, medium-sized turbines range from 1 to 100 kW, large turbines cover the 100 to 1000 kW range, and ultra-large turbines exceed 1000 kW. Virtually all types of generators are utilized in wind power generation, with the most common being synchronous, asynchronous, DC, and permanent-magnet generators. Recently, overseas, there has been a growing trend toward using permanent-magnet, external-rotor brushless DC generators for ultra-large wind turbines.
Industrial and agricultural production
In industrial and agricultural production, the vast majority of mechanical equipment is powered by various types of electric motors. Most of these motors are supplied via distribution transformers, while machinery located far from the power grid or mobile equipment often rely on diesel generators as their power source. Small- to medium-power induction motors are extensively used in a wide range of applications, including machine tools, rolling mills, blowers, printing machines, water pumps, oil extraction units, cranes, conveyor belts, and production lines. This widespread adoption is due to the simplicity, reliability, ease of maintenance, and low cost associated with induction motors, which account for more than 60% of all electrical load power. In recent years, the proportion of various new types of motors has also begun to rise steadily.
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Sichuan Guozhong Power Generation Equipment Co., Ltd.
Add: No. 14, Shitingjiang Road, Jingyang District, Deyang City, Sichuan Province
Tel : 0838-2222718 0838-2229218
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