Longnan Textile Machinery Factory (714,000 1st) is a large-scale cotton spinning machine, and it is also one of the equipment with large power consumption in the cotton spinning mill. Generally, the spinning machine consumes more than 30% of the electricity in the textile mill, accounting for spinning. About 60% of the yarn is used for electricity, therefore, the optimization of the main motor of the spinning machine enables the spinning machine to adopt a highly efficient and energy-saving motor, which has a significant power-saving effect.
Spinning machine main motor in the application of the following features: long running time, 24 hours of continuous operation.
High ambient temperature, the motor is installed in the front box, ventilation and heat dissipation by the tunnel, the air temperature often exceeds 40 * C, and sometimes even reaches 60 * C. The motor is generally working in underload conditions, the load rate is usually about 75%.
Full-load long-term operation is required at both operating speeds.
The phase efficiency "Optimized design of FXD180M1-4/6 type motor efficiency is similar to Table 1. Table 1 Type Power kW Synchronous speed r/min Efficiency %2 Design points According to the spinning machine main motor in the application of the characteristics, determine the following design Principle: Use a single-winding scheme with high 4 and 6-pole winding coefficients as much as possible, and minimize the harmonic content to reduce vibration and noise.
Without affecting the use of 6 poles of the motor, try to improve the efficiency and power factor of 4 poles.
At 75% load, the 4-pole efficiency is 92.3%, and the efficiency curve is required to be as flat as possible.
Because the main motor of JF03 series spinning machine generally adopts 2Y/A or 2Y/Y inversion method pole-changing winding, after years of practice shows a good performance, but the winding 4 coefficient when the winding coefficient is low, the magnetic field waveform is stronger The even harmonics, no-load current and no-load losses, the power energy index is low, and the starting performance is poor. The 4/6-pole windings using the "phase commutation method" have higher 4 and 6-pole winding coefficients, a reasonable air gap flux density ratio, low harmonic content, and simple adjustment control. As a result, its output and performance indicators have been greatly improved, and performance has been significantly improved. The comparison is shown in Table 2. Table 2 Number of poles Output power P2kW Connection distribution coefficient Kd Short distance coefficient Kp Winding coefficient Kdp Coil span Y Air gap magnetic flux density ratio Bg2/Bg3 Power factor CosF efficiency h% As can be seen from Table 2 In terms of efficiency, the efficiency of the FXD18M1-4/6 motor 4-pole using the "phase commutation method" is much higher than that of the JF03-61A-4/6 motor, and it is in a long-term operating state, so it has obvious sections. Electrical effect; at the same time, the 6-pole efficiency is also higher. In terms of power factor, although the power factor of the FXD180M1-4/6 motor is lower at the 6-pole than that of the JF03-61A-4/6 motor, the operation time of the 6-pole winding is extremely short, and only 2 runs per driving are considered. Fly minutes, so no effect on power saving.
In addition, the slot coordination has influence on starting performance, noise, stray loss, temperature rise, etc. of the asynchronous motor, and the main motor of the spinning frame needs to be frequently started in operation, which has high requirements for noise and vibration. After a comparative analysis, It was decided that 36/32 of the rotor slots should be used. Through the prototype test, this problem was well solved and good results were achieved.
In addition to taking into account the above factors, the timing also uses computers for optimal design. Under the guidance of advanced theories, computerized computers are used to optimize the design so that the performance of the main motor of the spinning machine can reach the domestic advanced level.
3 The test conditions of the prototype are 4/6-pole windings (connected to 4Y/3Y) using the “phase commutation methodâ€. Compared with the JF03-61A-4/6 type, the mainframe motor FXD180M1-4/6 is designed. 4 pole efficiency increases by 4%, total loss decreases by 36%; at 6 poles, efficiency increases by 5%, and total losses decrease by 34%. After field tests of Shaanxi Northwest National Cotton No.5 Plant and Shanxi Jingwei Textile Machinery Plant, various performance indicators All meet the design requirements. The on-site comparison test data on the FA502 spinning frame is as follows: (1) Product unit consumption comparison item Electricity saving rate kWh Output km(2) Spinning speed, motor speed, surface temperature rise and power factor comparison Item Rising (ten) or falling (1) Roller speed r/min roller speed r/min motor speed r/min motor surface temperature rise k room temperature C power factor cosf is 3.28%, and each spinning frame output is calculated as 21000M, then FXD180M1-4/6 type (15/7kW) is used ) The electric motor can save 7.3kWh per day; it can save 2600kWh per unit per year, saving 1040 yuan (calculated at 0.4 yuan per kWh of electricity). According to the production of 1,500 units a year, the annual electricity savings of 1.56 million yuan. In addition, the motor surface temperature rises by an average decrease of 2.33*C, which can reduce workshop heat, reduce air-conditioning investment costs, improve the workshop environment, and increase the power factor, reducing the cost of reactive compensation investment.
4 Conclusions Prototype testing and on-site operation tests have proved that it is appropriate to use the main motor of the JF03-61A-4/6 type (15/7kW) spinning frame with obvious power-saving effect. Now the motor has been widely used in the spinning machine. It is estimated that from the successful development to date, more than 8,000 units have been produced, bringing great economic benefits to the society.
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