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Future development trend of the motor industry

2019-05-09 Number of clicks:

The development and production of electric motors in China started late, but they developed rapidly. The production and application of high-power motors in China can be traced back to the Cultural Revolution. All semiconductor devices of the driver circuit are completely localized. They are logic circuits composed of fully discrete components and counters, flip-flops and ring distributors with capacitive coupling inputs. Medium-voltage high-power semiconductor devices have been completely localized. After the reform and opening up, China's motor development ushered in a climax. The beginning of reform and opening up. The subdivision control of stepping motor has been basically mastered in China; the research and application of linear motor started from the 1970s, and at that time, although the research on linear motor in China has achieved some results, it is quite different from the foreign level. Until the 1990s, the widespread use of high-power motors in China in heavy industry marked the relative maturity of technology. Coincidentally, the small power motor industry has made great progress after more than forty years of development, especially since the rapid development of reform and opening up. In general, the small-power motor industry can be divided into two development stages in China: The first stage, in line with the development needs of China's home appliance industry, is applied to the home appliance industry, and domestic enterprises gradually reduce and develop through technology introduction and equipment introduction. Some of the country's gap products have reached the international advanced level, and some product brands with extensive market reputation have also been formed. In the second stage, with the rapid development of the automobile industry, the increase in demand for small-power motors for vehicles has also driven permanent magnet DC and The rise of low-power motors such as brushless DC motors. Motor future development trend prediction With the development of modern high-tech industry, motor technology has gradually matured, with the advancement of many other scientific disciplines and engineering methods, for example, the development of power electronics, human power high voltage level power electronics Advances in the field of materials, advances in materials, the emergence of new permanent magnet materials and insulating materials, the development of analytical tools such as networks and IT technologies, finite elements, increasing environmental awareness and the use of renewable energy have made traditional motors new. Development and application. Future motors will move toward high efficiency, high power density, high reliability, low noise, and good maintainability and replaceability. Accordingly, the development trend of motors in several practical fields has been predictable. First of all, the development trend of linear motor, linear motor system has the advantages of simple structure, light weight, low inertia, fast dynamic response, high speed and acceleration, high precision, small vibration and noise, etc. It is an ideal transmission for all kinds of ultra-high-speed precision machine tools. The method has broad application prospects in various high-speed and precision processing equipment. Its development trend is mainly reflected in the increasingly mature technology, the characteristics of increasingly industrialization and its more and more widely used applications. In addition, the addition of new technologies such as high-end CNC machine tools will play a significant role in promoting its development. Compared with the conventional drive, the direct drive of the permanent magnet motor directly brings more benefits to the user. The removal of the traditional gears reduces the noise of the drive system, reduces the maintenance cost, reduces the weight of the drive system, and increases the reliability of the system. It is one of the development trends and directions of the motor in the future. The progress in the field of high temperature superconductivity has also provided new possibilities for the development of electric motors. Some of the research prototypes have achieved 3.75 MW. The rotor of the high temperature superconducting machine contains a high temperature superconducting coil, and the cooling device maintains the rotor winding at a temperature of 25K to 30K. The advantages of high-temperature superconducting machines are obvious. Not only is the harmonic distortion rate lower than that of conventional motors, but their overload capability and efficiency are also unattainable by conventional motors. Ultrasonic motor is a new type of motor developed at the end of the 20th century in the world. It breaks through the concept of traditional electromagnetic motor. There is no armature winding and magnetic circuit. It does not rely on electromagnetic interaction to convert energy, but uses the reverse pressure of piezoelectric ceramic. Electrical effects and ultrasonic vibrations convert the microscopic deformation of the material into a macroscopic motion of the rotor or mover through resonant amplification and frictional transmission. Compared with traditional motors, it has the characteristics of small inertia, fast response, good control characteristics and low noise. It can be widely used in micro-machines, robots, precision instruments, household appliances and other fields. The magnetic levitation motor uses the principle of “same-sex repelling and opposite-sex attraction” between the stator and the moving field of the mover to suspend the mover, and at the same time generate propulsion to drive the mover to move in the suspended state. Therefore, there is no mechanical contact between the stator and the mover, which can produce higher acceleration, less mechanical wear, easy mechanical and electrical protection, convenient maintenance, overhaul and replacement, suitable for harsh environments, extremely clean and pollution-free environment and needs. field of. The research of magnetic levitation motor is getting more and more attention from scientists and technicians, and its development prospects are encouraging. In addition, the control of the motor is also developing towards intelligence. Intelligent control is applied in many application areas and has good control effects. For example: fuzzy control, neural network control, learning control, and control of the expert system. The biggest advantages of these control methods are: no precise mathematical modeling of the controlled object, and strong robustness, which is very suitable for controlling nonlinear, variable parameter objects of the motor. The more mature fuzzy control does not need to control the precise mathematical model of the object, can overcome the influence of nonlinear factors and the like, and has strong robustness to the parameter changes of the controlled object. At present, fuzzy control has achieved good results in AC and DC speed control systems and servo systems. Conclusion Throughout the history of China's motor development, we can find that the development of motors has always been the embodiment of the level of technology. Today, the motor industry is still an area of ​​great interest to scientists and engineers. The advancement of modern technology has changed the face and connotation of traditional motor technology and injected the latest content. In order to meet today's diversified market demands, the development of the motor industry is still promising.

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