For motor users, while paying attention to motor efficiency indicators, they also pay attention to the purchase price of motors; while motor manufacturers, while realizing and meeting the requirements of motor energy efficiency standards, pay attention to the manufacturing cost of motors. Therefore, the material investment of the motor is relatively large, which is the core issue in the market promotion of high-efficiency motors. Various motor manufacturers have been scrambling to increase research and development efforts, and pursue the development of relatively low-cost motors with high energy efficiency.
Frequency conversion motors and permanent magnet synchronous motors are energy-saving products, but the most widely used ones are power frequency motors. In order to further promote and restrain the energy-saving awareness of motor manufacturers and users, the country has issued a number of standards and policies on improving motor efficiency. .
GB18613 is an energy efficiency requirement standard for small and medium-sized three-phase asynchronous motors. During the implementation and revision of the standard, the level of energy efficiency limit requirements for motors is gradually increasing, especially in the latest 2020 version. The first-level energy efficiency stipulated in the standard has been It has reached the IE5 level, which is the highest energy efficiency value stipulated by the IEC.
Relatively large material input can effectively improve the efficiency level of the motor, but it is not the only way. In terms of effectively improving the efficiency level of the motor, in addition to the improvement of the design technology, the manufacturing process of the motor is particularly critical, such as the casting copper rotor process, the use of copper bar rotors, etc. But must a high-efficiency motor use a copper bar rotor? the answer is negative. First, there are many process feasibility problems and defects in cast copper rotors; second, copper bar rotors not only have high material costs, but also require a large investment in equipment. Therefore, most motor manufacturers avoid using copper rotors, but try to minimize the various losses of the motor by reducing the end size of the stator winding, improving the motor ventilation system, and improving the machining accuracy of the motor parts, especially when the impact is the highest. Among the practical measures of energy efficiency indicators, some manufacturers have vigorously improved and applied the low-pressure aluminum casting process, and achieved remarkable results.
In general, the means to improve efficiency are comprehensive. Simply replacing the rotor guide bars of the motor from aluminum bars to copper bars can effectively improve the efficiency of the motor in theory, but the actual effect is not ideal. The necessary resource integration and market competition mechanism will reshuffle the motor industry again and again, and the practical technology that can stand the test of all aspects in the survival of the fittest is the key to breaking through the bottleneck.
Post time: Feb-14-2023