In the processing and manufacturing of products and industrial production, the applications of pumps, fans and other equipment are more and more extensive, the consumption of electric energy and the throttling loss of some equipment such as baffles and valves, as well as their daily routine. The cost of repair and maintenance accounts for almost 20% of the cost. This is a small expenditure on production costs. With the development of the economy, the reforms continue to deepen, the market competition is intensifying, and energy conservation and consumption reduction has gradually become an improvement in product quality. And an important means of reducing production costs. 1. Basic theory of frequency conversion energy-saving technology The basic principle of the use of frequency conversion technology: for a long period of time, the frequency of the alternating current used by electrical equipment is maintained at a fixed state. The use of frequency conversion technology is to make the frequency become a kind of adjustment and utilization. Resources. Nowadays, the most active and fastest development of frequency conversion technology is the variable speed control technology. Frequency conversion technology, including computer technology, power electronics technology, click drive technology, is a comprehensive and relatively strong technology, combining mechanical equipment and strong and weak electricity. It means that the signal of the power frequency current is converted into other frequencies. This conversion is mainly done by semiconductor components, and then the alternating current is converted into direct current, and the electromechanical equipment is realized while the inverter regulates the current and voltage. The degree of stepless speed regulation. All in all, the frequency conversion technology controls the speed of the motor by changing the frequency of the current, so that the motor equipment can be effectively controlled. These are all based on the increase of the current frequency and the motor speed. The frequency conversion technology is characterized by the ability to make the motor run smoothly, and can perform automatic acceleration and deceleration control, which can reduce the energy consumption while improving work efficiency. In the daily operation of the frequency converter, mainly using the direct torque control and vector control methods, the artificial neural network and the fuzzy self-optimized control mode in the future development of the frequency converter, and the frequency converter through continuous development, its comprehensive The sex will be higher and higher. On the basis of the basic speed control function, it also has the functions of communication, programmable and parameter identification. 2, the principle of energy saving of the inverter 2.1 frequency conversion energy saving mode According to fluid mechanics, the power = pressure * flow, the flow rate and the speed of the primary is proportional, the pressure is proportional to the square of the speed, the power is proportional to the cube of the speed, if the pump efficiency is fixed, when the flow is reduced At the same time, the rotational speed will decrease proportionally, and the output power will decrease in a square relationship. Therefore, the rotational speed of the pump and the power consumption of the motor are approximately cubic. For example, a pump motor with a power of 55 kW, when its speed is adjusted to 80% of the original speed, its power consumption is 28 kW / h, and the power saving rate is 48%. However, if the speed is adjusted to 50% of the original, the power consumption becomes 6 kWh, and the power saving rate reaches 87%. 2.2 Using power factor compensation to save energy Reactive power not only causes the equipment to heat up, but also increases the wear of the wires. The most important point is that the power factor is reduced and the active power of the grid is also reduced. Therefore, a large amount of reactive energy is consumed in the line, resulting in equipment. The use efficiency is reduced, and the waste phenomenon is very serious. After the frequency conversion speed control device is used, the reactive power loss is further reduced due to the filter capacitor inside the inverter, so that the active power of the power grid is increased. 2.3 Using soft start mode to save energy Since the motor is started by Y/D start-up or direct start-up, the starting current is four to seven times the rated current, which will cause serious impact on the power supply grid and electromechanical equipment, and the capacity requirements of the grid are also very high. High, it will generate a relatively large current when starting, and the damage to the valve and the baffle during the vibration is also very large, and the service life of the pipeline and equipment is also very unfavorable. The use of the frequency conversion device, using the function of the soft start of the inverter, makes the starting current start from zero, and the maximum value will not exceed the rated current, so the impact on the power grid and the requirements on the power supply capacity are greatly reduced. The service life of valves and equipment has also been greatly extended. 3. Application examples of frequency conversion energy-saving technology Taking the installation of the frequency converter on the 160kW circulating water pump as an example, we modified the variable frequency energy-saving equipment and tested the power consumption before and after the transformation, and achieved very satisfactory results. 3.1 Control mode before the frequency conversion transformation In the operation of the circulating water pump, when the flow rate changes due to the needs of the process, the actual flow rate of the water pump is changed by adjusting the opening degree of the water pump outlet and the inlet. This adjustment mode is called throttling adjustment. In this example, the valve opening of both the outlet and the inlet is 60%. This is a very uneconomical adjustment in terms of power utilization. 3.2 Control mode after frequency conversion transformation In the operation of the circulating water pump, when the flow rate changes due to the needs of the process, the inlet and outlet valves are fully opened, and the motor speed is adjusted to find a suitable new operating point to obtain a suitable flow rate. According to the actual situation and the needs of the site to achieve manual control or automatic control, in this case, because the flow is not required to be adjusted frequently, according to the actual situation and needs of the site, it is determined that the actual working frequency of the motor is 40 Hz, and The manual control method was adopted, and the main purpose was to save energy. 4. Changes in operation after using the variable frequency speed control system A complete soft start is realized. When the motor is started, the rotation speed of the rotor increases slowly as the frequency of the input power increases, so that the speed is smoothly improved. The startup time of the whole system is set to about 20s, and the system will not be used. The impact is more stable than the original starting method. The current used by the power grid has also been greatly reduced, making the use of electrical equipment safer. At the same time, because the frequency is reduced, the motor speed is also reduced, the wear on the machine is reduced, and the probability of failure is greatly increased. Reduced and reduced maintenance costs. The transformer that supplies power to the pump saves most of the power supply capacity, and the simple active load decreases, and the saved capacity is about 50 kW, which improves the utilization efficiency of the equipment. The factor of the motor power is also increased accordingly, which makes the operation of the motor more economical. 5 Conclusion The use of frequency conversion technology improves product quality, reduces energy consumption, saves energy, and further improves the economic benefits of enterprises. The application of frequency conversion speed regulation technology is to transform these equipments to achieve energy conservation. In Ceiling Speakers,Silk Diaphragm Tweeter,In Wall Ceiling Speakers,Two Way In Ceiling Speakers The ASI Audio Technology Co., Ltd , https://www.asi-sound.com