外文文獻翻譯plc控制下的電梯系統(tǒng)-展示頁
2024-12-18 05:20本頁面
【正文】 icroelectronics and puter technology to control the rapid development of technology, munication technology VVVF also a very rapid rate. AC variable frequency motor speed control technology is the power to improve the process in order to improve product quality and improving the environment and promoting technological progress as a primary means. Frequency of its excellent performance and the speed brake from a smooth performance , high efficiency ,high power factor and powersaving effect of a broad scope of application and many other advantages of being at home and abroad recognized as the most promising approach speed Exchange characteristics of VVVF Elevator (1) Low energy consumption (2) Low load circuit , the required emergency power supply device of small In the acceleration stage, the Required startup current of less than times the rated current. Peak starting current and time is short .Since the starting current is drastically reduced, so power consumption and power supply cable diameter can be reduced a lot. Required for emergency power supply devices are also relatively small size. (3)High reliability and long service life (4)Good fort Elevator operation is best to follow the speed curve of a given operation .Their characteristics can be adapted to human feelings, and to ensure that noise operation, smooth brake Ping layer and high precision (5)Stable noisefree (6) In the car, the engine room and adjacent areas to ensure that noise. Because their systems use a high clock frequency. Always produce a true sine wave power supply current yet. Motor torque ripple does not appear. Therefore, to eliminate vibration and noise. 3. Elevator control technology The socalled elevator control technology is to point to the elevator control system and drive system of the electrical automatic control, as our country in the 1970 s the main sign is the elevator exchange double speed the elevator. Its speed control method is used to change the elevator of the traction motor extremely logarithms, two or different extremely logarithm winding, including a number of high speed winding called less winding, a number of winding called low speed winding, high speed wind
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