How to save energy and create the most economic benefits with the least energy consumption has become the goal pursued by every manufacturer. Taking the cement industry as an example, in 2011, the Ministry of Industry and Information Technology announced 790 cement manufacturers that needed rectification. Among these manufacturers, small cement plants or enterprises with high energy consumption and low output value accounted for the vast majority of cement that needed to be phased out or upgraded. The total production capacity of the industry is as high as 370 million tons. In the production line (equipment) that needs to be eliminated, the ball mill and the machine shaft kiln are mainly used. The ball mill is a device that consumes a large amount of electricity and has the largest motor capacity in the production of aerated concrete. It is widely used in cement, metallurgy, building materials and chemical industries. In the ball mill, the motor of the transmission part is also a large power consumer. The rated power of the motors in ordinary mechanical equipment is selected according to the ability to meet the limit capacity of the equipment. In actual operation, the load rate of most mechanical equipment is below 70%, and the annual load rate of mechanical equipment in petroleum, mining and other industries is below 50%. If the maximum efficiency of the motor cannot be achieved at a low level of load, the efficiency of the motor is very low and the power is extremely wasteful. The energy-saving permanent magnet motor direct drive technology and its optimized redundant control technology can automatically switch the number of running branches (inverter groups) according to the actual load rate of the motor, and actually increase the load rate of the system. Taking the permanent magnet direct drive winch motor produced by Dalian Yulin Motor Co., Ltd. as an example, the motor can achieve 94% efficiency at 34% load rate, close to 97% of the highest efficiency, and at very low load rate. The highest efficiency of the motor can be achieved. At normal load rates, power is fully utilized. This energy saving advantage is even more pronounced if it is a heat engine powertrain drive system that is less efficient in energy conversion.
A simple understanding of direct drive of a permanent magnet motor is that the motor can directly start and drive the load without the need to reduce the transmission torque by reducing the transmission speed, such as a gear, a pulley or a fluid coupling. Taking the permanent magnet direct drive motor produced by Hunlin Motor as an example, it can run at low speed, and the output is much higher than that of ordinary motor, achieving the effect of directly driving the load, and has an efficiency of up to 98.6% and a power of 0.997. Factor. This high power factor is obvious for improving the economic benefits of enterprises. China's power supply enterprises stipulate industrial electricity, electricity costs = basic electricity costs + electricity tariffs + power factor adjustment electricity charges, specific to different equipment companies, power factor regulations To reach different values, when the value is higher or lower than the specified value, calculate the monthly electricity fee according to the specified electricity price, and then increase or decrease the electricity fee according to the percentage specified in the “Power Factor Adjustment Electricity Meter” specified by the state. According to the power factor calculation of the permanent magnet direct drive motor produced by Yulin Motor, the annual billiard mill can save at least 200,000 yuan for the enterprise. Take the transformation of a ball mill in a certain area as an example. At that time, the industrial park was limited in electricity, and the factory owner was miserable. In order to save electricity for production, the permanent magnet direct drive motor produced by Yulin Motor was used instead, which not only saved the spare parts such as pulleys, but also directly driven the barrel, combined with the advantages of permanent magnet direct drive motor. The power saving effect is over 30%. Successfully solved the dilemma that may be discontinued due to insufficient power. On the other hand, for the original power supply equipment, under the same active power, the increase of the motor power factor can reduce the apparent power and the current on the power supply line, thus increasing the capacity reserve to the conforming transmission, thereby satisfying the load. The demand for growth maximizes the potential of the original equipment. Under the condition that the active power is constant, the improved power factor can reduce the capacity of the selected transformer, which not only reduces the initial investment cost, but also reduces the basic electricity price after the operation. Since the basic electricity price is charged according to the capacity of the installed transformer, the larger the capacity, the higher the charge; the smaller the capacity, the lower the charge.
