The high speed motor is composed of rotor and stator, which is used to realize the conversion of electrical energy and mechanical energy. The stator is the stationary part of the motor, and the rotor is the rotating part of the motor. The main role of the stator is to produce a rotating magnetic field, and the main role of the rotor is to be cut by the magnetic line in the rotating magnetic field to produce (output) current.
First, the trend of specialized production in the industry is becoming increasingly obvious
From the structural point of view, the motor is mainly composed of two parts of the stator and the rotor, the main components of the stator are stator core, stator winding, frame, etc., the main components of the rotor are rotor core, rotor winding, shaft and so on. The quality and performance of the stator and rotor core directly determine the performance, energy efficiency and stability of the motor. Therefore, the stator and rotor industry is closely related to the development of the motor industry.
China's motor industry has a hundred years of history since 1905, when the Tianjin Teaching Products Manufacturing Institute produced Wim Astor generator and other electrical and magnetic teaching AIDS. More than 60 years after the founding of New China, the motor industry has developed rapidly, and is now widely used in various economic fields such as industry, agriculture, national defense, public utilities and household appliances.
In the mid-1980s, Shanghai took the lead in the emergence of a special service for motor enterprises, rotor stamping production enterprises.
In the 1990s, in the initial stage of the development of the industry, the production enterprises specializing in the production of motor, rotor punching and iron core are generally small in scale, mainly relying on location advantages to serve the main motor manufacturers in the surrounding area. The products are mainly based on conventional low-voltage motor punching, and the business model is mainly based on simple incoming processing business. The production technology is relatively backward, and the added value of products is low.
In the early 21st century, with the continuous optimization of product structure and the continuous improvement of production technology level, the strength of fixed and rotor core production enterprises has been continuously enhanced, and gradually formed obvious professional advantages in new product design, basic material research, production technology, product testing and special equipment development. The cost optimization and reliable quality of fixed, rotor punching and iron core products provided by the enterprise have prompted the motor enterprise to accelerate the development pace of professional production. The product line of the industry gradually extends from punching to stator core, cast aluminum rotor, large motor segment and finished product, rotor, etc.; The product series has been extended from low-voltage products to high-voltage products, low-voltage high-power products and generator fixed, rotor core products; The business model has gradually changed from a simple processing model to an independent "procurement-manufacturing-sales" model.
Since the beginning of the 21st century, as internationally renowned motor enterprises have entered the domestic market and built their production bases in China, the production process and technical level of fixed and rotor core have been greatly improved. Product series has added in line with the United States, Europe high efficiency and energy saving motor standards, rotor core products and wind turbines, traction motors and new energy vehicles for the drive motor class, rotor core products, the trend of professional production in the industry is becoming increasingly obvious.
The upstream and downstream of stator rotor of high-speed motor are more concentrated, and the upstream is mainly silicon steel plate, cast iron, steel, graphite and other raw materials; Downstream are high-speed motors, fans, compressors, pumps and electric vehicles and other equipment.
Second, the proportion of stator and rotor in the output value of the motor is 30%
From the perspective of the output value of the motor, although the motor specifications and types are more, but the structure is roughly the same, mainly including the stator, rotor, end cover, bearing cover, bearing, junction box, suspension ring, wind hood and cooling fan. Rotor as a core component, its output value in the total output value of motor parts accounted for nearly 30%.
Data show that China's high-speed motor manufacturing industry sales revenue to maintain a growth trend, but the growth rate has slowed. In 2012, the sales revenue of high-speed motor manufacturing industry was 2.27 billion yuan; The sales revenue of high-speed motor manufacturing industry was 3.631 billion yuan, an increase of 5.92%, and the annual compound growth rate was 8.14%.
Third, stator rotor technology development trend analysis
The development goal of rotor punching and iron core production technology is to continuously improve the conversion efficiency of electrical energy and mechanical energy, while reducing material consumption and improving production efficiency through the research and improvement of basic materials, as well as the improvement of production technology and process. Therefore, the development trend of high-speed motor stator and rotor technology is mainly reflected in the research and development of basic materials, the design and manufacturing of molds, the improvement of processing technology and the improvement of the level of production equipment.
