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

A distributed control system, frequency conversion speed regulation technology, applied in the direction of computer control, control/regulation system, control of multiple AC motors, etc., can solve the problems of inconvenient control operation management and maintenance, low control precision, complex structure, etc., to achieve The effect of improving system reliability and control management level, simplifying system structure and reducing equipment cost

Inactive Publication Date: 2007-07-25
HUNAN UNIV OF ARTS & SCI
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Problems solved by technology

[0003] In order to overcome the shortcomings of the traditional motor synchronous control system, such as complex structure, poor reliability, low control precision, and inconvenient control, operation, management and maintenance, this invention studies a network-based, computer-controlled frequency converter that does not use an elastic frame A new method of multi-motor synchronous operation control with sensors such as tension or tension, and a corresponding DCS is designed

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

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Embodiment Construction

[0019] The specific implementation method of the present invention and its DCS system structure and principle are illustrated below in conjunction with the accompanying drawings.

[0020] Accompanying drawing 1 is the multi-motor synchronous control new method of the present invention and its DCS block schematic diagram, host computer 1 and each control subsystem 2 namely several groups of field PCs such as A group and B group are connected into a local area network, M1 in A group is The master unit motor and the others are slave unit motors. During the continuous processing of materials, according to the different requirements of the process, the linear speed (V) of each unit maintains "synchronous" coordinated operation according to the relationship in (1), α i is the processing speed ratio coefficient.

[0021] V i = α i ·V i-1 , i=1, 2...m (1)

[0022] The principle is to use the computer 3 to perform data communication with each frequency converter 6 supporting the fi...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P5/46H02P5/74H02P27/04G05B19/418G05B15/02
CPCY02P90/02
Inventor 潘湘高
Owner HUNAN UNIV OF ARTS & SCI
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