On the morning of November 6, the leaders and guests who just attended the opening ceremony of the 2008 China (Changsha) Science and Technology Achievements Transformation Fair gathered in Changgu High-tech Zone, Shibuya, and held the groundbreaking ceremony for the Changsha Photovoltaic Industrial Base.
The photovoltaic industry is an emerging energy industry based on solar energy. In recent years, Hunan's photovoltaic industry has developed rapidly, forming a comprehensive comparative advantage from silicon materials, equipment technology, material research and development, talent team to the entire industry chain. At present, Changsha has a total of 7 projects under construction, contracting and talking about photovoltaic industry. The total investment of all projects is more than 13 billion yuan, and the estimated output value can reach more than 40 billion yuan.
In order to promote the rapid development of Changsha's photovoltaic industry, promote the optimization and upgrading of industrial cluster structure, and enhance industrial competitiveness, Changsha Municipal Party Committee and Municipal Government decided to establish Changsha Photovoltaic Industrial Base in Shibuya, Changsha High-tech Zone. The planned area of ​​the base is about 236 hectares, including 215 hectares of industrial land. Focus on the layout and production of solar wafers, cell sheets, battery assemblies and modules, energy storage and application products, photovoltaic power generation systems, etc.; packaging and production of LED epitaxial chips and lighting equipment, display equipment and various application products; Research and development and production of important equipment and equipment in the industrial chain. Changsha High-tech Zone will introduce a series of preferential policies to support the development of photovoltaic industry, and provide strong support in project land use, loan financing, technology introduction, etc., attracting a large number of domestic and foreign PV product R&D and production enterprises to gather in Shibuya, making it a new type of Changsha. The growth of industrialization.
On November 6th, the CLP 48 (China Electronics Technology Group No. 48 Research Institute) PV industry project with a total investment of 800 million yuan will form a 100MW photovoltaic industry chain with an estimated output value of 10 billion yuan. 48 is the leading R&D and production unit of solar photovoltaic equipment in China. It has successfully developed key technologies such as cleaning machine, diffusion furnace, PECVD, etching machine, high and low temperature sintering furnace, single crystal furnace, polycrystalline ingot furnace and multi-wire cutting machine. Equipment, currently 48 photovoltaic equipment accounts for nearly 85% of the domestic solar photovoltaic equipment market share, has become the leading enterprise in solar photovoltaic industry equipment manufacturing. In recent years, CLP 48 has seized the opportunity of the rapid development of the world's solar cell industry, and has taken advantage of its advantages in equipment, technology and talents to participate in the field of solar cell production. In 2008, 48 solar cell production capacity will exceed 225MW. In the next three years, the capacity of 48 crystalline silicon solar photovoltaic cells will reach more than 500MW.
At the same time, the Shenzhou Photovoltaic Solar Cell Project was also signed. The project is jointly funded by Changsha Xinda Investment Co., Ltd., Hunan Yingtai Investment Real Estate Co., Ltd., Jiangsu Shunda Photovoltaic Technology Co., Ltd. and Jiangsu Shenzhou Solar Energy Technology Co., Ltd. The total investment of the project is 400 million yuan, and 8 25MW solar energy will be built. The production line of battery chips will reach more than 5 billion yuan after production.
The Expo uses a lot of LED lights comparable to the Bird's Nest 2008-11-07
Product evaluation: Jiacheng grid spotlight product evaluation 2008-11-06
Fujian Yuanguang Yaming Sun Shiping comments on industry winter (Figure) 2008-11-06
1
Advantages of Permanent Magnet DC Motor or PMDC Motor
PMDC motor have some advantages over other types of DC motors. They are :
- No need of field excitation arrangement.
- No input power in consumed for excitation which improve efficiency of DC motor.
- No field coil hence space for field coil is saved which reduces the overall size of the motor.
- Cheaper and economical for fractional kW rated applications.
Disadvantages of Permanent Magnet DC Motor or PMDC Motor
- In this case, the armature reaction of DC motor cannot be compensated hence the magnetic strength of the field may get weak due to demagnetizing effect armature reaction.
- There is also a chance of getting the poles permanently demagnetized (partial) due to excessive armature current during starting, reversal and overloading condition of the motor.
- Another major disadvantage of PMDC motor is that, the field in the air gap is fixed and limited and it cannot be controlled externally. Therefore, very efficient speed control of DC motor in this type of motor is difficult.
A spur gearbox could be either square type or round type as following:
According to the size of the gearbox, normally we have 12mm DC Spur Gear Motor, 25mm DC Spur Gear Motor, and 37Mm Dc Spur Gear Motor and so on.
DC Spur Gear Motor are relative simple in production, so the output efficiency is limited. According to the stages of the gear trains, the efficiency reduce one by one. However, the price would be a bit cheaper than other types DC Gear Motor .
DC Spur Gear Motor
Dc Spur Gear Motor,Spur Gearhead Dc Motor,Gear Spur Dc Motor,High Torque Dc Spur Gear Motor
SHENZHEN DONGMING MOTOR CO., LTD. , http://www.dmdcmotor.com