Motor industry occupies a very important position in national product, widely used in various fields of industrial production, its technology is developing very quickly. In recent years, with the development of the emerging industry, micro-motor become NE series bucket chain hoist motor industry development, is our country electrical appliances industry (motor) "15" the focus of the development of products, in addition of rare earth permanent magnet motor, the bearingless motor is the new trend of technology development.

A & nb pebble mill production line sp; micro-motor

& hot mining vibrating screen have spent 1 micromotor application field

Micro-motor refers to the diameter of less than 160 mm or power rating is less than 750 w or with special performance, special purpose machine. Micro-motor combines motor, microelectronics, power electronics, computer, automatic control, precision mechanical wet coal crusher of different subjects, new materials, new and high technology industries, especially in electronic technology and the application of new material technology has promoted the micro-motor technology progress. Micro-motor up to more than 5000 kinds of varieties and specifications of multifarious, market application field is very wide, involved in the national economy, national defense equipment, every aspect of human life, which require electric occasions can see micromotor.

Application of micromotor are mainly in vibrating screen machine under several aspects:

(1) home appliances with FU type plate conveyor chain motors. Appliances with motor variety, quantity is very large, its core technology is micro &special motor and control technology, although it is comparatively mature market, but as people living standard and the enhancement of environmental awareness, home appliance product design, production, testing require high quality of quantitative, this is new model products with multi-function, energy saving, low noise, small vibration, etc, so the market will grow significantly in the future.

2 communications, computer peripheral products. Communication and computer network has already penetrated into People's Daily life, along with the rapid development of industry technology and continuous improvement, the high precision demand more and more varieties, small motor quantity huge growth, new species emerge in endlessly. Electronic control technology to improve, also make the micromotor added value to increase separation machinery, therefore, has a great potential for future development.

(3) automobile micromotor. The world car sales rising, the function, application of electronic accessories are increasing. Traditional carburetor was replaced by the automatic quantitative electronic fuel injection system, ABS brakes are replaced by motor instead of... Traditional car is equipped with a dozen motor, and now has grown to SanSiShiGe, some even use more than eighty motor. Motorcycles starting motor to replace the foot also, environmental protection electric cars need more than a regular car electronic components. Industry requirements for high-performance heavy hammer crusher dc motor technology is improving, demand is also increasing.

Feeding plate (4) & n BSP; Electric tools with micromotor. Apart from industrial use, home use portable power tools are developing very quickly. Advanced electric tools humanized constantly improve, also constantly improve the degree of automation, the series motor performance requirements are more stringent, the development is very considerable.

Other special use motor [5]. Satellite receivers steering machine, mower, disabled car motor, CNC servo motor is rising year by year, the number of computer mechanical vibration table and the top appliances with the largest rise in number of brushless motor, more than ten million units.

[6] industrial motor. International economic development is on the rise, the emerging industrial countries increase, drive the industry hair wavy guard conveyor, constantly updated equipment, new machine production, continuously making industrial motor is still full of hope in the future.

2 micro-motor technology to machine direction

Micro-motor manufacturing process, involving more sophisticated structure, fine, fine processing, magnetic materials processing manufacturing, and processing technology, such as insulation, winding needs large number of process equipment, high precision. In order to guarantee the quality of products and gravel equipment also need a series of precision testing instruments, as well as the investment of industry, and labor-intensive and technology-intensive high-tech industry. The international development trend of the micro-motor technology mainly as follows:

(1) products to high-performance, lightweight, permanent magnetization and coreless, brushless, mechanical and electrical integration, intelligence and composite development. Bluestone sand making machine

In terms of high performance and lightweight, mainly is aims at the improvement of the performance of the traditional products and product size reduction. For automobile, electric bicycle motor, for example, USES the disc structure, so that the same vehicles parts, small volume reduction motor vibration conveyer. And as the rotating transformer, the use of compensation, at the same level of the performance, can shrink a stand, or stand under the same precision can be improved. Of multipolar, error precision is greatly increased. For home appliances and other occasions to use ac and dc micro-motor, plastic seal technology, can raise the temperature, reduce the noise.

In order to obtain good dynamic performance, reduce the system cost, coreless motor in the future will be a substantial increase in the specifications and production. This kind of motor in dc printing machine, disc windings, a cup of armature dc micro-motor, etc., will be a large number of spread, used in cars, electric moped, printing equipment and automation equipment and military equipment.

In brushless aspects, the main development of brushless dc motor, in order to improve product reliability and life expectancy. Brushless motor has been widely used in household appliances, audio-visual equipment, automobile and other fields. For example, in the frequency conversion air conditioner adopt alternative asynchronous motor, brushless dc motor efficiency can be improved obviously. Air conditioner indoor fan, such as using encapsulation of brushless dc motor to replace the original single phase asynchronous motor, low noise can obtain good speed regulation characteristics. Brushless motor performance advantages, make its will have broad market prospects.

Is mainly in terms of combination of military equipment and industrial automation equipment to meet the demand of the miniaturization, the Angle sensor, speed sensor electric motor, servo motor, reducer and brake according to the different USES combined into an organic whole, unit product development, as an independent functional components of the machine or parts, or direct drive and linear drive products development. The whole machine adopts motor rotor directly as a driving element, for example, to eliminate the intermediate transmission mechanism, not only simplifies the structure, and can improve the system accuracy. As another example, in order to improve the nc machine tools machining precision, adopt ac linear servo motor, etc.

2 intensive animal production technology, flexibility, automation, specialization and the development of networked manufacturing collaboration supporting. Developed countries attach great importance to the flexible production production. "Soft" can be overcome with many varieties of small batch as the characteristics of micro-motor production organizational difficulties, intensive production mode, production automation and networking of specialization, production coordination can make to realize scale economy for characteristics of the production in large quantities.

As the international market competition intensified, micro-motor product market life more and more short, the developed countries attach great importance to the motor production, flexible production can overcome so many varieties of small batch as the characteristics of micro-motor production organizational difficulties. And intensive production mode, production automation and networking of specialization, production coordination can make to realize scale economy for characteristics of the production in large quantities. Using CAD/CAM software such as computer-aided design, aided manufacturing technology is the common pursuit of manufacturers, so can shorten product development cycle and reduce costs.

(3) to the efficient and automated testing technology.

Motor drive and control adopts integrated circuit, its biggest advantage is simplified circuit, is advantageous to the motor is thin and short, and improve, driving accuracy and reliability, while reducing costs. With the improvement of the performance of the motor, to the matched detection accuracy is higher.

(4) to the development of CAD design technology.

Modern CAD technology is no longer to complete a process calculus in isolation, not only has the design analysis, design, synthesis, design optimization, and other functions, can the information management, graphical display, expert system, such as discipline organically linked, form a new integrated software system, thus greatly improve practicability and convenience. And early motor CAD technology, in the absence of modern computing technology, such as database, knowledge base, artificial intelligence, etc.) of the support, the design of the data before and after processing requires a lot of manual intervention, and the relevant data and the data is still need to go to in the design manual search, its practicability and convenience is poor, the design efficiency is also lower.

3 micro-motor production status

At present, the micro-motor mostly belongs to the small and medium-sized enterprise, micro-motor industry product technical level is not high. In recent years, foreign famous enterprises to enter the Chinese market very fast, presents a distinct characteristics, the impact on the development of local enterprises in our country.

First is paid attention to by foreign companies realize local business. Along with the international market competition becomes more intense, in order to seek the moderate competition, foreign enterprise is more and more attention to local electric concept. One is to utilize the local rich resources and cheap labor force, the production, sales and products; Second is the use of local manpower and intelligence for management and research and development of new products.

Secondly, the foreign enterprises pay more and more attention to the development and production of brushless motor, reinforced with high and new technology as the main means of competition. With the progress of electronic control technology and the advantages of the brushless motor, for people to know brushless motor has become one of the main development direction of micromotor. Represented by Japanese wanbao to horse co., LTD., foreign companies are actively developed brushless motor, such as dalian wanbao to motor company producing micro brushless motor about 40 million units in 2002. Taiwan company is also actively invest in mainland China, the production of computer fan with brushless motor, the monthly output reached millions of units.

In addition, Hong Kong and Taiwan investment on mainland micro-motor production increased significantly. Especially in the coastal regions such as guangdong, micro-motor wholly owned companies and joint ventures more and more, prompting micromotor competition is fierce, leading to down the price of exports. At the same time, in the domestic offices and agencies of foreign companies more and more, especially the micro-motor production equipment and testing equipment and related products. At present, most of famous foreign companies have set up offices in China.

For this kind of situation, the country asked state-owned small and medium enterprises to the market, to become independent, self-financing, self-development, self thing about legal entity, policies to encourage small and medium-sized enterprises according to their own characteristics at the same time, choose the restructuring forms, such as formation of co., LTD., a joint stock cooperative system, authority management, sale, contract operation, the joint venture, etc., and encourage joint between enterprises, merged to form a enterprise group, help enterprise to international market, all of this brings the micro-motor industry in our country to continue the development opportunity.

Two rare earth permanent magnet motor

Rare earth permanent magnet motor is a kind of rare earth magnets to excitation of the motor, it not only has the general permanent magnet motor has simple structure, reliable operation, low fever, higher efficiency, also because of the rare earth permanent magnet has a great magnetic energy product, therefore, has small volume, light weight, high efficiency and good properties and a series of advantages. USES the rare earth permanent magnet motor can significantly reduce weight, such as 10 kw generator, weight is 220 kg, dilute the permanent magnet generator is 92 k8. Developed by German Siemens 1095 kw, 230 RPM, six levels of permanent magnet synchronous motor used in ships, compared with the past use of dc motor, reduce about 60% volume, total loss by 20%. Rare earth materials, with its excellent magnetic, in the national economy is playing an increasingly important role in various fields.

Rare earth permanent magnet motor efficiency, the average power saving rate is as high as 10%, some special motor power saving rate is as high as 15% ~ 20%, and the price is reasonable. It has become a new generation of aviation, aerospace, navigation in all kinds of motor of the main development direction, but also because of its high efficiency and energy saving for industrial use (especially power users, such as textile, coal, oil, machine tool, automobile and other industries) motor development inevitable trend. The development of high efficiency and energy saving of rare earth permanent magnet motor can force index and price, strong competitiveness in the international market.

3 the bearingless motor

Bearingless motor is according to the principle of magnetic bearing and motor to produce electromagnetic force, the magnetic bearings in radial force windings are installed on the motor stator, through the decoupling control of the motor torque and radial levitation force of independent control, also known as magnetic levitation motor. The bearingless motor has advantages of magnetic levitation magnetic bearing all, need maintenance free, long running life, sterile, no pollution, and the transmission of the poisonous and harmful liquid or gas bearingless motor is a typical applications. Compared to traditional motor and magnetic levitation bearing structure, it is small in size, and because the motor's magnetic field is used as a basis to create the levitation force and magnetic levitation motor can also reduce maglev force needed electricity, so as to improve the efficiency of the system.

Currently on the international research of bearingless motor, there are mainly three kinds of magnetic resistance type magnetic suspension motor, induction motor and permanent magnet magnetic levitation maglev motor. In addition to the analysis of the bearingless motor current, voltage and derived from the basic principle and the relationship between levitation force, according to different types, the research focuses on different.

Has no bearing on international motor developed from the early 1990 s, after more than 10 years of development, has made certain achievements. Japan studies in the field of the bearingless motor is in the lead, in addition to the analysis of the basic principle of the bearingless motor and motor current, voltage and the relationship of the levitation force is derived, in view of the magnetic resistance and induction bearingless motor torque component of current and suspension control component interference, several different decoupling control method is proposed and used in the experiment, and studies the optimal induction type bearingless motor, rotor resistance. For permanent magnet type bearingless motor, different magnetic steel installation form of bearing motor is studied and its optimal magnetic steel thickness value, etc. Japanese scholars have developed magnetic resistance type bearingless motor, induction type bearingless motor and permanent magnet type bearingless motor, such as prototype.

But the above research work mainly focused on experimental research, technology development and prove that the structure of the various motor in the bearingless motor technology in the application feasibility of international study of the bearingless motor is an exploration research stage. In this technology in China started late, it was not until 2002 that saw a related literature reports.

Now the bearingless motor in the semiconductor industry, chemical industry field, life sciences, the application of to improve product quality, reduce cost, reduce pollution play an important role.