After entering the 20th century, the rapidly developing power electronic technology, microelectronic technology, computer technology and modern control theory endowed the motor with new life, which not only made the control performance of the AC drive comparable to that of the DC drive, but also produced permanent magnet brushless DC motors, AC servo motors, switched reluctance motors, brushless doubly-fed motors and a series of new special motors that are different from traditional motors. The motor coordinate transformation theory proposed by Park in the 1920s, the vector control concept proposed by Hasse in 1969, the perfect vector control theory of AC motors by Blaschke in 1971, and the direct torque control theory proposed by Depenbrock in 1985, etc. These theoretical innovations greatly promoted the motor Industry progress. In order to meet various application requirements, the continuous development of new structures, the use of new materials, and the improvement of processing technology are still the focus of the development of micromotors. Axial disc structures, block combination structures, sheet windings, etc., while high-performance rare earth permanent magnets, The wide application of new materials such as ceramic alloys, solid magnetizers, high-strength engineering plastics, etc. is having a profound impact on the development of micro-motor technology.

    The "2014-2018 China Micromotor Industry Operation Monitoring and Investment Prospect Analysis Report" released by China Industry Information Network shows that the disciplines and technical fields involved in micromotor technology include motor technology, material technology, computing technology, control technology, microelectronics Technology, power electronics technology, sensor technology, network technology, etc., are comprehensive technologies that intersect in multiple disciplines and fields. The latest achievements in various disciplines and technical fields can be quickly applied in the field of micro-motors, especially the development and application of new materials, the development and application of new-generation drive technology, and the development of networked control technologies, all given to micro-motors Bring new development concepts and deepen into product applications.

    With the advancement of information technology, material technology, life technology and energy technology, micro-motor technology is entering a new stage of development, and its trends are reflected in:

    (1) Energy saving and intelligentization. Energy saving is a requirement of all walks of life, and intelligence is a requirement for the development of modern technology and meeting human living standards. With the advancement of technology, products in various application fields of micro motors have continuously increased requirements on motors. For example, in the field of home appliances, with the promotion of healthy, energy-saving, and intelligent inverter air conditioner home appliances, the corresponding supporting motors are required to have higher efficiency to achieve energy-saving purposes, and require intelligence to achieve fuzzy control of home appliances. Achieve a high degree of automation.

    (2) Mechatronics. With the development and changes of electronic technology, control technology and motor body, the boundaries between traditional motor classifications are becoming more and more blurred, which is an inevitable trend of mechatronics. Mechatronics technology is a comprehensive new technology integrating various emerging technologies and precision machinery led by microelectronics. With the mature development of power electronic technology and the increase in customer demand for automation, motors, speed control devices and electrical appliances are regarded as a whole. The development direction of motors and drive systems is: integration, that is, power electronics, motors and control systems are highly integrated. The above three are closely integrated from design, manufacturing to operation and maintenance; generalization, that is, the same transmission system can Different control methods are implemented for different types of motors and different operating modes; informatization, that is, the modern electric drive system is not only a device for converting and transmitting energy, but also a channel for transmitting and exchanging information.

    (3) Brushless. In order to reduce the noise during the operation of the micromotor, improve the electromagnetic compatibility performance and the reliability of the motor, and extend the service life of the motor, in addition to continuous improvement in the structure of the motor, the industry has been committed to the development of various brushless motors. After years of research and development, significant results have been achieved, such as brushless DC motors, brushless self-tuning machines, and brushless resolvers. Many new motor types have entered commercial production. For example, the use of a brushless permanent magnet DC motor in the inverter compressor of a refrigerator can greatly increase the adjustable range of its refrigeration level. However, due to the high technical requirements involved in brushless motors, it is required to master related motor technology, hardware technology, software control technology, sensing technology, rare earth material technology, high-power electronic technology. At present, high-power brushless motor products in the domestic market are still Relatively rare. China Industry Information Network

    (4) Miniaturization. Due to the rapid development and wide application of electronic technology, on the one hand, micromotors are required to develop in the direction of miniaturization, flattening, and lightening to meet the needs of increasingly miniaturized electronic products; on the other hand, they also create conditions for the miniaturization of micromotors. . The miniaturization of a micromotor refers not only to its mass and volume, but also to its power consumption. The motor used in modern electronic products (such as mobile phones) is often one of the components with the largest total power consumption. As in aerospace systems, it is usually powered by fuel cells or solar cells. The power consumption of all electrical components is strictly controlled. Therefore, the miniaturization of micromotors is an urgent problem that needs to be solved. In order to miniaturize the motor, measures such as improving the design, simplifying the structure, adopting new materials and new processes are usually adopted. For example, a Japanese company introduced a micromotor weighing only 4mg, which can travel through human blood vessels.

    (5) Permanent magnetization. With the development of micromotors in the direction of thin, light, brushless and electronic, the universal application of permanent magnet materials in micromotors has become an inevitable trend. China is rich in rare earth resources, and the maximum magnetic energy product of the NdFeB permanent magnets developed and produced (magnetic energy product is one of the important parameters to measure the energy stored in the magnets) is at the international advanced level, providing a good development for China’s permanent magnet motors. conditions of.

    (6) Low noise, low vibration and low interference. With the improvement of people's living standards, environmental conditions are required to be quiet and optimized. In order to ensure the normal collection, transmission and storage of information, it is necessary to prevent wireless electromagnetic interference. Reducing the noise and vibration of micromotors and preventing electromagnetic interference are important topics in future product development and production process transformation.

    (7) Digitization. The digitization of micromotors refers to the use of programmable controllers in their control units, integrating modern control theory, power electronics technology, microelectronics technology, etc., to achieve adaptive adjustment and control of motor speed and position. The realization of simulation of motor control strategy is gradually withdrawing from the historical stage, and the digital control system composed of modern means such as microprocessors, general-purpose computers, DSP controllers has been rapidly developed, and the motor control system is moving towards high precision, high performance, network The direction of informationization, informatization and system chip is constantly improving. China Industry Information Network

    (8) Testing technology is developing towards high efficiency and automation. After the medium and large scale integrated circuits are used for the motor drive and control, the control circuit is simplified, which is conducive to the thinning and shortening of the motor driver, and improves the driving accuracy and reliability, while reducing costs. With the improvement of the performance of the motor, the precision of the matching detection technology is required to be higher.

    (9) The use of extreme manufacturing techniques. Micromotor manufacturing technology is developing from conventional manufacturing and traditional manufacturing to extreme manufacturing. The so-called extreme manufacturing refers to the manufacture of devices and systems of extreme scale or high functionality under extreme conditions or environments. Such as: manufacturing sky vehicles, micro-nano motors, micro-nano optical electromechanical systems and other very small-scale and extremely high-precision products.