Application of FGI FD5000 Series Medium Voltage Drive in Paper Mill
1.Overview
High concentration grinding machine for a wide range of slurry, whether shrubs, branches and other different trees, or other cotton poles, hemp, rice, wheat grass, reed and other papermaking raw materials, can be separated into good fiber. The equipment cuts less fiber, the effect is remarkable, and the toughness of the fiber is good, which can effectively protect the length of short fiber such as broad-leaved wood pulp and grass pulp.
2.Implementation plans
Two sets of 10kV / 4000kW high voltage permanent magnet synchronous motor FD5000 Medium Voltage inverter have been in safe and trouble-free operation for more than 3 years on the grinding machine system of a paper machinery pulp company in Shandong.
The site uses FD5000 Medium Voltage inverter to control the permanent magnet synchronous motor to drive the high concentration grinding machine, compared with the assynchronous motor drive low concentration grinding machine 50% power savings, is highly recognized by customers.
Compared with synchronous motor, permanent magnet synchronous motor does not need traditional variable speed device and has high power density. At the same time, the moment of inertia of the permanent magnet synchronous motor is smaller than that of the general async motor and the dynamic response is higher than that of the async motor, and the permanent magnet synchronous motor can directly drive the high-speed load, so as to avoid various losses and noise brought by the variable speed device.
The application of slurry grinding machine and permanent magnet synchronous motor is more and more extensive in the paper industry. In order to solve the problems of starting and control difficulties brought by permanent magnet synchronous motor, the permanent magnet synchronous motor with directional control strategy of space vector magnetic field is adopted. Permanent magnet synchronous motor frequency converter has the advantages of stable operation and good corresponding speed for high concentration grinding machine and permanent magnet synchronous motor system.
