Computer control multiple motor variable frequency and speed regulating synchronous method and its central and distributing control system

Abstract

The invention discloses synchronization method for variable frequency speed control of multiple motors controlled by computer based on network, and relevant distributed control system (DCS). Through RS-232 / field control bus converter, and field control bus, PC carries out serial data communication to each frequency converter, as well as reading, calculating and rewriting operational characteristic parameters, and control parameters of each frequency converter. Thus, the method implements distributed control for synchronous operation of multiple motors, making linear speeds of multiple rollers equal or keep certain speed ratio so as to guarantee normal continuous processing. The invention simplifies system structure, reduces cost of equipment, raises reliability of system and level of control and management as well as saves energy etc.

Description

technical field

[0001] The invention relates to multi-motor synchronous automatic control, that is, a multi-motor frequency conversion and speed regulation synchronization method realized by a PC computer controlling a frequency converter through a network and a collection and distribution control system (DCS). Background technique

[0002] The traditional multi-unit motor "synchronous" transmission system uses a heavy DC motor plus a gearbox for transmission. A pendulum or roller elastic frame and a resolver are used between the units. Sensors constitute a constant tension control system. These methods have complex structures, poor reliability, low control accuracy, and inconvenient control operation management and maintenance. The reason is determined by the inherent characteristics of the feedback closed-loop control system, that is, its dynamic quality depends on good control parameters, while its steady-state control accuracy depends on the accuracy and stability of the...

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