阅读说明：本技术 一种用于水力发电的三相永磁同步发电机 (Three-phase permanent magnet synchronous generator for hydroelectric power generation ) 是由 金文奎 安保靖 金艳 张志� 于海涛 于 2019-10-10 设计创作，主要内容包括：本申请实施例公开了一种用于水力发电的三相永磁同步发电机,所述该发电机取消了常规发电机转子的磁极线圈,改用永磁磁块拼装,结构简单,体积小、重量轻。取消了复杂的励磁系统。发电系统自动化更加简化。维修保养方便。采购成本是常规发电机的50%,重量和体积是常规发电机30%,效率提升7%(铜、铁及摩擦损耗下降,无励磁功率损耗),节能效果特别显著。针对东方红电站的发电机改造解决了常规电机体积和重量结构受限制的不能进入的特殊问题。(The embodiment of the application discloses a three-phase permanent magnet synchronous generator for hydroelectric power generation, the generator cancels a magnetic pole coil of a conventional generator rotor, is assembled by permanent magnet blocks instead, and is simple in structure, small in size and light in weight. A complex excitation system is eliminated. The automation of the power generation system is more simplified. The maintenance is convenient. The procurement cost is 50% of the conventional generator, the weight and the volume are 30% of the conventional generator, the efficiency is improved by 7% (the friction loss of copper, iron and the excitation power is not reduced), and the energy-saving effect is particularly obvious. The special problem that the conventional motor is limited in size and weight structure and cannot enter is solved by modifying the generator of the Dongfanghong power station.)

1. The utility model provides a three-phase permanent magnet synchronous generator for hydroelectric power generation, includes axle extension (1), main terminal box (2), heater and temperature measurement terminal box (3), fan (4), motor main part (5), mount pad (6), heat dissipation window (7), characterized by: the shaft extension (1) is located at the center of the front end of the motor main body (5), the main junction box (2), the heater and temperature measuring junction box (3) and the fan (4) are respectively installed on the upper portion of the motor main body (5), the installation seat (6) is installed at the bottom of the motor main body (5), and the heat dissipation window (7) is installed at the front end of the motor main body (5) and located on the left side and the right side of the motor main body (5).

2. A three-phase permanent-magnet synchronous generator for hydroelectric power generation according to claim 1, said shaft extension (1) being characterized in that: the diameter of the shaft extension (1) is D, and the length of the shaft extension (1) is L1.

3. A three-phase permanent-magnet synchronous generator for hydroelectric power generation according to claim 1 or claim 2, said shaft extension (1) being characterized in that: the diameter D of the shaft extension (1) is within the range of 100 mm-200 mm.

4. A three-phase permanent-magnet synchronous generator for hydroelectric power generation according to claim 1 or claim 2, said shaft extension (1) being characterized in that: the length L1 of the shaft extension (1) is in the range of 200 mm-300 mm.

5. The three-phase permanent magnet synchronous generator for hydroelectric power generation of claim 1, wherein the heater and temperature measuring junction box (3) is characterized in that: the heater and temperature measuring junction box (3) is arranged at the rear end of the main junction box (2).

6. A three-phase permanent-magnet synchronous generator for hydroelectric power generation according to claim 1, said fan (4) being characterized in that: the fan (4) is arranged at the rear end of the heater and temperature measuring junction box (3).

7. A three-phase permanent-magnet synchronous generator for hydroelectric power generation according to claim 1, the mounting seat (6) being characterized in that: the number of the installation bases (6) is 4, each installation base (6) is provided with an installation hole (6-1), and the diameter of each installation hole (6-1) is phi.

8. A three-phase permanent-magnet synchronous generator for hydroelectric power generation according to claim 1 or claim 7, said mounting seat (6) being characterized in that: the diameter phi of the mounting hole (6-1) of the mounting seat (6) is within the range of 40 mm-50 mm.

Technical Field

The invention relates to the field of electromechanical equipment, in particular to a three-phase permanent magnet synchronous generator for hydroelectric generation.

Background

China has the characteristics of abundant rare earth resource reserves, complete mineral species and rare earth elements, reasonable rare earth grade and mineral site distribution and the like, and has the advantage of unique development of the permanent magnet motor. In addition, the high-performance permanent magnet material neodymium iron boron has excellent performance, the manufacturing process is increasingly perfect in recent years, the price is rapidly reduced, and conditions are created for the development of a permanent magnet motor.

The design of the traditional motor is based on an equivalent circuit, the fundamental wave magnetic field of a main magnetic circuit is calculated by adopting a magnetic circuit method to determine the performance of the motor, the influence of higher harmonics is approximately corrected by curves, charts, empirical coefficients and the like, the design method is poor in calculation accuracy, different types and structures of motors need different formulas to calculate, and in the face of the ever-changing market demands, common designers are difficult to form an effective formula program in a short time to perform electromagnetic calculation, so that the development of new products is severely restricted.

Due to the diversity of the structure of the permanent magnet motor and the complexity of magnetic circuit analysis, the performance of the permanent magnet motor is difficult to accurately calculate by using a traditional analytic method. Ansoft Maxwell is widely applied to various electromagnetic engineering fields as world famous commercial low-frequency electromagnetic field finite element analysis software, and is based on Maxwell differential equations, and the electromagnetic field calculation in the engineering is converted into a huge matrix solution by adopting a finite element discrete form. The method is applied to analyzing permanent magnet motor products, is not limited by the structural form, and can obtain an accurate enough analysis result as long as the boundary condition is properly set.

Disclosure of Invention

The application provides a three-phase permanent magnet synchronous generator for hydroelectric power generation, this generator has cancelled the magnetic pole coil of conventional generator rotor, changes into permanent magnet block to assemble, simple structure, and is small, light in weight. A complex excitation system is eliminated. The automation of the power generation system is more simplified. The maintenance is convenient. The procurement cost is 50% of the conventional generator, the weight and the volume are 30% of the conventional generator, the efficiency is improved by 7% (the friction loss of copper, iron and the excitation power is not reduced), and the energy-saving effect is particularly obvious. The special problem that the conventional motor is limited in size and weight structure and cannot enter is solved by modifying the generator of the Dongfanghong power station.

The power of the permanent magnet direct drive generator is the same as that of the electromagnetic direct drive generator, and the difference between the structural size and the weight is 70%. Compared with a 375kva/24 pole 380V generator.

Permanent magnet generator of electromagnetic generator

Height of 1000mm 500 at center

Weight 11500kg 3700kg

Excitation power of 8kw is no

Bearing friction power 17kw 1.1kw

Cooling loss 5.0kw 1.5kw

Bearing cooling water 3.0kw does not have

Lubricating oil pump 5kw without

2000kg of lubricating oil

Excitation system without

Magnet coil copper material 900kg permanent magnetic strip 90kg

Diameter of main shaft of generator is 110mm and 250mm

The weight difference of the above comparison is 7800kg, and the unit price per ton is 30000 yuan =23.4 ten thousand yuan; the unit price of the copper material is 900kg 60000 yuan =4.2 ten thousand yuan; the unit price of the excitation system is 5 ten thousand yuan; the unit price of the lubricating oil is 15 yuan per 2000kg =3.0 ten thousand yuan; lubricating and cooling system equipment by 3 ten thousand yuan; total direct cost reduction 38.6 ten thousand yuan by 11 stations =424.6 ten thousand yuan. The long-term operation loss (the loss of excitation, bearing friction, cooling, lubricating oil and the like) is reduced by 35.4kw, the energy is saved by 9.44% quite, and 5000 × 35.4 × 11 stands =194.7 ten thousand kwh 0.4 yuan/kwh =77.88 ten thousand yuan is calculated according to 5000 hours of annual operation. Because the direct-drive structure is adopted to eliminate the gear box and the load reduction of the bearing is equivalent to increase the power generation efficiency by 5 percent, 375KW 11 pieces 5 percent 5000 hours =103 ten thousand KWH 0.4 yuan =41.25 ten thousand yuan, and the annual operation and maintenance cost is reduced by 26 ten thousand yuan. The total income increasing expenditure is 145 ten thousand yuan.

This is the result of a small hydropower plant retrofit. By implementing 30% transformation of permanent magnet generators in 2 ten thousand small hydropower stations in China, 6000 x 9.9 tons of copper metal can be saved, and 5.94 ten thousand tons of copper metal can be saved; 51.48 ten thousand tons of steel are saved; the annual energy is saved by 116 hundred million kwh. Because the volume and the weight of the motor adopting the permanent magnet structure are reduced, the load of the bearing is reduced, and the common rolling bearing is adopted, a thin oil lubricating system is cancelled, the influence of oil on the environment and the noise influence of a gear box are eliminated, and the production and working environment is improved. Meanwhile, the spatial structure of installation and maintenance and hoisting equipment are optimized. The construction and design and manufacturing costs are reduced considerably. Has great significance for national energy conservation and emission reduction, the replacement of fuel by electricity and the application of new materials.

The popularization and application range can be popularized and applied in the industries of small hydropower stations or wind power and the like in China.