Usually, the speed of the wind wheel is very low, which is much lower than the speed required by the generator for electricity generation. It must be achieved through the effect of increasing the speed of the pair of gears in the gearbox. gearbox is also called speed multiplier box. According to the general unit configuration requirements, sometimes the transmission shaft (commonly called large shaft) directly connected to the wind turbine hub is integrated with the gearbox, or the large shaft and gearbox are arranged separately, with an expansion sleeve device or coupling used. In order to increase the braking capacity of the unit, a braking device is often installed at the input end or output end of the gearbox, and is used in conjunction with peak braking ( fixed pitch wind turbine) or the variable pitch braking device forjointly brake the transmission system of the device.
List of companies carrying out pilot projects for innovative enterprises (103 companies in total) - China Aerospace Science and Technology Corporation, China Petrochemical Corporation, State Grid Corporation of China, China Yangtze River Three Gorges Companies of Engineering Development Corporation, Shenhua Group Co., Ltd. and Technology (Datang Telecom Group) Iron and Steel Research Institute Beijing Nonferrous Metals Research Institute Coal Research Institute Mechanical Research Institute China Textile Research Institute Agricultural Mechanization Research Institute from China Sinoma Technology Co., Ltd. Xi'an Heavy Machinery Research Institute Beijing General Mining and Metallurgy Research Institute Wuhan Post and Telecommunications Research Institute Sanlenovo (Beijing) Co., Ltd. Beijing Hanwang Technology Co., Ltd. Beijing Xinwei Communication Technology Co., Ltd. Beijing Renchuang Technology Group Co., Ltd. Tianjin Steel Pipe Group Co., Ltd. Tianjin Tasly Group Co., Ltd. China CNR Tangshan Taiyuan Heavy Machinery Group Co., Ltd. Locomotive and Rolling Stock Factory Taiyuan Fenghua Information Equipment Co., Ltd. Inner Mongolia Mengxi High-tech Group Co., Ltd. Shenyang Xinsong Robot Automation Co., Ltd. Liaoning Aoke Chemical Group Co., Ltd. Jilin Huawei Electronics Co., Ltd. Changchun Rail Bus Co., Ltd. Yiyang Xintong Co., Ltd. Harbin Pharmaceutical Group Sanjing Pharmaceutical Co., Ltd. Shanghai Zhenhua Port Machinery Co., Ltd. Shanghai Baoxin Software Co., Ltd. Shanghai Electrical Apparatus Research Institute (Group) Co., Ltd. Company Shanghai WuXi AppTec New Drug Development Co., Ltd. Nanjing Lianchuang Technology Co., Ltd. Yangtze River Pharmaceutical Group Co., Ltd. Farson Group Co., Ltd. Sukron Technology Group Co., Ltd. Zhejiang Geely Holding Group Co., Ltd.Zhejiang Hisun Pharmaceutical Co., Ltd. Chery Automobile Co., Ltd Company Anhui Fengyuan Group Co., Ltd. Fujian Xingwang Ruijie Communication Co., Ltd. Fujian Nanjing Wanlida Technology Co., Ltd. Jiangxi Changjiu Nongke Chemical Co., Ltd. Jiangxi Dexing Baiqinyi VC Sodium Co., Ltd. ., Ltd. Yantai Wanhua Polyurethane Co., Ltd. Shandong Denghai Seed Co., Ltd. Xu Ji Group Co., Ltd. Zhengzhou Yutong Bus Co., Ltd. Wuhan Huazhong CNC Co., Ltd. Xiangfan Xinghuo Auto Parts Manufacturing Co., Ltd. Changsha Zoomlion Technology Development Co., Ltd.Co., Ltd. Guangzhou Kingfa Technology Co., Ltd. Guangdong Fenghua High-tech Co., Ltd. Guangdong Weichuang Rixin Electronics Co., Ltd. Guangzhou Institute of Mechanical Sciences Guilin Likait Environmental Protection Industrial Co., Ltd. Hainan Sino Industrial Co., Ltd. Hainan Quanxing Pharmaceutical Co., Ltd. Chongqing Sichuan Instrument General Factory Co., Ltd. Chongqing Communications Research and Design Institute Chongqing Holley Pharmaceutical Co., Ltd. Sichuan Changhong Electric Co., Ltd. Panzhihua Iron and Steel (Group) Company Chengdu Diao Pharmaceutical Group Co., Ltd. Guiyang Aerospace Linquan Technology Co., Ltd. Guizhou Huitong Huacheng Building Technology Co., Ltd. Yunnan Baiyao Group Co., Ltd. Kunming Ship Equipment Group Co., Ltd. Tibet Linzhi Qizhengzang Pharmaceutical Factory Xi'an Haitian Antenna Technology Co., Ltd. Jinchuan Group Co., Ltd. Tianshui Xinghuo Machine Tool Co., Ltd. Ningxia Dongfang Tantalum Co., Ltd. Western Mining Co., Ltd. Qinghai New Energy Research Institute Co., Ltd. Xinjiang Tunhe Industry and Trade (Group) Co., Ltd. Xinjiang Zhonghe Co., Ltd. Xinjiang Shihezi Zhongfa Chemical Co., Ltd. Dalian Sanke Technology Development Co., Ltd. Ningbo Haitian Group Co., Ltd. Ningbo Bowei Group Co., Ltd. Xiamen Tungsten Industry Co., Ltd. Xiamen Overseas Chinese Electronics Co., Ltd. Haier Group Company Hisense Group Co., Ltd. Huawei Technologies Co., Ltd. ZTE Corporation Some codes are not available. , such as Huawei Technologies Co., Ltd.