Multi-motor synchronization control system

Abstract

The invention provides a multi-motor synchronization control system, which comprises a host control device for controlling a host and slave control devices for controlling salves, wherein the host consists of a motor group consisting of two asynchronous motors with the same parameters, wiring terminals of the asynchronous motors are connected in parallel, and motor shafts of the asynchronous motors are rigidly connected; each slave consists of a motor group consisting of two asynchronous motors with the same parameters, wiring terminals of the asynchronous motors are connected in parallel, and motor shafts of the asynchronous motors are rigidly connected; an output shaft of the host are flexibly connected with output shafts of the slaves; the host control device and the slave control devices are used for performing centralized control and motor rotating speed estimation on the whole motor groups by adopting a speed sensor-free vector control manner; the slave control devices perform proportion integration operation on a difference of the motor torque current itref1 of the host and the motor torque current itref2 of the slaves, and adds the difference to the estimated motor rotating speed omega1 of the host and the motor slip ratio omegas2 of the slaves, and the sum is used as the synchronous speed omega for controlling the slaves.

Description

technical field [0001] The invention is applied in the field of industrial electric transmission, relates to a multi-motor synchronous control system, and in particular relates to implementing multi-motor synchronous control on asynchronous motors by using speed sensorless vector control. Background technique [0002] There are usually three control methods for asynchronous motors, namely, V / F control, speed sensorless vector control and speed sensor vector control. The V / F control method is a kind of macroscopic control. When it is used for synchronous control of multiple motors, there is little difference between the master and the slave in the microcosm; synchronous control is relatively easy to implement. With speed sensor vector control, since the motor speed is measured through the code disc, etc., the precision is high, and the synchronous control of the master and slave is also easy to realize. The speed sensorless vector control is different from the above two cont...

AI Technical Summary

Problems solved by technology

[0004] Because this method requires separate (one-to-one) control of the motors, when the number of motors is large, the same number of controllers will not only cost a lot, but also the connection between the master control device and the slave control device will become very complicated, and any If a connection fails, it will cause the slave control device to fail to control normally and make the synchronous control invalid

Moreover, too many connections also increase the possibility of data loss and distortion during transmission, reducing the reliability of the system

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