Professor Li Xianglin of Qingdao University: Application of Low Speed and High Torque Permanent Magnet Motor and Its Intelligent Drive System

From September 23 to 24, the 14th China Cement Energy Conservation and Environmental Protection Technology Exchange Conference and the 6th Intelligent Summit Forum were held in Zibo, Shandong Province.

At the meeting, Li Xianglin, a special technical consultant of Rizhao Dongfang Motor, a professor of Qingdao University, shared the application of low-speed and high-torque permanent magnet motor and its intelligent drive system.

Li Xianglin said that the main shaft speed of key equipment in cement industry (roller press, elevator, belt conveyor, powder concentrator, ball mill, zipper, rotary kiln, etc.) Is 6-150r/min, which belongs to the field of low speed and high torque. High speed asynchronous motor + hydraulic coupling/high speed coupling + reduction gearbox (+ backstop + auxiliary drive) is equipped with a matching asynchronous motor "big horse pulling small car", which runs at a non-optimal working point for a long time and has low energy efficiency; the vibration noise is large, the bearing and seal are worn quickly, and the installation is complex; the gearbox has high manufacturing technology requirements, and the imported products are often used, and the price is high; Need compensation cabinet, soft start device and so on.

In contrast, the low-speed direct-drive permanent magnet motor drive system developed by Rizhao Dongfang has high power factor (0.95 ~ 0.99), high efficiency (more than 95%), wide high efficiency area, high safety and reliability, the whole system operates in the low-speed area, long life cycle, low operating speed, low vibration and low noise, permanent magnet excitation and non-electric excitation, low temperature rise; Independent research and development of special frequency conversion control system, adjustable speed, high precision, fast dynamic response, can achieve load adaptive control, energy saving and efficiency; intelligent operation and maintenance, "mechanical-electrical-magnetic-thermal" multi-domain collaborative online data monitoring platform, time-frequency domain comprehensive analysis of online monitoring characteristic variables, to achieve intelligent operation and maintenance of key equipment motor drive system in cement production.