0 Preface The dynamic mathematical model of asynchronous motor is a high-order, nonlinear and strongly coupled multivariable system. Vector control is an advanced control method of motor control system. It is widely used in asynchronous motor tuning due to its superiority in -----
Recently, Xiamen Xinda (000701) re-issued the announcement of asset impairment provision. The reporter found that in the first three quarters alone, Xiamen Xinda made a three-year announcement, and the total provision for inventory depreciation was RMB 6,641,800. However, the company is still indi-----
Transformers In electrical equipment and wireless circuits, transformers are often used as lifting voltage, matching impedance, and safety isolation. In a generator, whether the coil moves through a fixed coil through a magnetic field or a magnetic field, a potential can be induced in the -----
On October 14, Shenzhen Lehman Optoelectronics released a performance forecast that the company expects net profit of 16.13 million yuan to 18.82 million yuan from January to September, down 30%-40% year-on-year, and net profit of 26.89 million yuan in the same period last year. Lehman Optoelectro-----
LED is a semiconductor that can convert electrical energy into visible light. It changes the principle of incandescent tungsten filament emission and energy-saving lamp trichromatic powder emission, and uses electric field emission. The main causes of LED damage are: 1. The sudden increa-----
[Text / high-tech LED reporter Zhu Chunwei] sponsored by Gaogong LED, the annual industry event - Gaogong LED Lighting Exhibition will be held on November 25-27, 2013 at Guangzhou Pazhou Poly World Trade Expo. As the largest professional LED lighting exhibition in the second half of this year, in -----
First, the intelligent sweeping robot reporter believes that it is a sunrise industry. As the technology matures and the cost decreases, it will enter the ordinary people's home. I would like to invite you to introduce: 1. The history of the development of intelligent sweeping r-----