Cooling motor temperature rise effect. :Wind turbine wind wear surface cooling wind enthalpy temperature rise 1 pre-mu way, trial use of steel plate rolling garden welding structure, the base outside the round welded by the steel plate bent inside the cooling ribs. The inner wind cooling air flows through the coil ends, air gaps, and rotor vents, cooling ribs internal air holes form a loop, and the outer wind cooling air flows through the cooling ribs outer surface. After the trial production of the generator is completed, the various performance indicators have been tested to meet the user requirements. However, compared with imported motors, the efficiency is slightly lower. In order to completely replace the imported motor, the optimal design of the generator was started. 2 Optimization process Analysis of generator loss test values ​​It can be seen that the generator wind wear is 7.4 kW, which is 3.5 kW higher than the 3.9 kW of the imported motor. This is an important factor leading to low generator efficiency. The heat dissipation of the generator depends on the cooling air generated by its internal and external fans. The large amount of wind and high wind speed are beneficial to further reduce the temperature rise of the generator, but this results in the cooling fan being oversized, which in turn increases the wind and wear of the generator and reduces the efficiency of the generator. How to properly determine the size of the fan, so that the generator's wind and energy consumption control at a low level while ensuring that the temperature rise to meet the requirements, which requires detailed heat calculation can be done. For this purpose, the heat calculation program of the surface-cooled motor was used to analyze and calculate the fan size, fan loss, air volume data, stator coil temperature rise, and rotor copper temperature rise data of the generator. First, the corresponding changes in the above-mentioned data are analyzed when the internal and external fan size changes. At this time, the external fan is fixed at a certain size. When the width of the inner fan is constant, its diameter is changed, and the following set of data is calculated by the heating program: Inside diameter () Internal wind loss (w) Wind volume inside wind (mVB) Stator line H Temperature rise (K) Rotor copper Temperature rise (K) From the above calculations, it can be seen that the change in air volume in the inner wind road has minimal effect on the temperature rise of the generator. The wind abrasion of the inner wind road is reduced from 4810W to 2096W, which makes the air volume in the inner wind path drop from 1.52m3/S to l.OmVs, while the temperature rise of the stator only rises by 1K. This may seem difficult to understand. After careful analysis, it can be found completely. It is the cooling mode of the generator that determines the wind speed in the cooling ribs (m/s) The temperature rise of the stator coil of the generator (K) Fan I1197 Fan n299. For a motor with a centralized cooler, the total heat of the motor is almost entirely brought by the cooling air flow generated by the inner fan to the cooling tube of the cooler. In this case, the cooling air volume of the inner air duct is crucial, while the surface cooling For the motor, most of the heat is directly transmitted to the cooling ribs on the surface of the frame through the mating surface between the outer circle of the stator core and the inner circle of the frame, and part of the heat is transferred to the outside of the frame or the end cap through the hot air inside the motor. On the ribs, the greater effect of the air flow in the inner wind path is to bring the air temperatures inside each point closer to avoid local overheating. In order to verify the effect of temperature on the temperature rise of the generator during the air flow rate of the inner air duct, a comparative test is as follows: keep the outer fan constant, exchange the inner fans of different sizes and measure the air volume of the inner air duct and the temperature rise of the stator coil respectively. The method for measuring the air volume in the inner wind path is as follows: drill a *6 hole in the cooling rib inside the air duct, and measure the wind speed with the measuring probe protruding into the hole. The comparison value of the wind speed is the comparative value of the air volume. The measured results are as follows: From this, it can be seen that the generator temperature rise only increases by 2K when the internal air volume increases by 5 times, which is basically consistent with the calculation. Next, the external fan size, external fan loss, stator coil temperature rise, and temperature rise of the rotor bar were analyzed. At this time, the size of the inner fan remains unchanged, and the outer diameter of the outer fan is changed without changing the width of the outer fan. The following data are calculated by the heat calculation program: Outer fan diameter (mm) Outer fan loss (W) Outer air flow rate (mVs) Stator coil temperature rise (K) Rotor copper temperature rise (K) It can be seen from this set of data that the change in the air volume of the external fan has a significant effect on the temperature rise of the generator. When the diameter of the outer fan changes from 640mm to 610mm, the wind wear decreases by 850W, the air volume decreases by 0.14m3/s, and the stator temperature rises by 1.3K; when the outer fan diameter changes from 550mm to 520mm, the wind wear decreases by 545W, and the air volume decreases. At 0.13m3/s, the temperature rise of the stator coil has increased by 2.1K. It can be seen that as the air volume of the external fan gradually decreases, the temperature rise of the stator coil rises faster, and the effect of reducing the friction and wear of the external fan gradually decreases. Become smaller. From the above analysis and calculation, the following conclusions can be drawn: The correct method to optimize the generator efficiency and reduce wind wear should be to reduce the size of the inner fan as much as possible, and the size of the outer fan must be controlled at the correct value so as not to reduce the wind wear. At the same time, the generator temperature rises too much. After repeated calculations, the optimal size of the fan inside and outside the generator is finally determined, and the fan adopts a low-loss backward-blade design. According to the test, the optimized turbine wind wear has been reduced from 7.4 kW to 3.85 kW, which has reached the level of imported motors, and the temperature rise of the generator is much lower than that of the imported motor, achieving satisfactory results for the users. Currently optimized wind turbine generators have been put into production to replace imported electricity
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