Device for one-drive-two control of three-phase AC asynchronous motors

Abstract

The invention discloses a device for one-drive-two control of three-phase AC asynchronous motors. The device comprises a main loop circuit, a control circuit, an operation box, a transducer cabinet and a switching cabinet, wherein the transducer cabinet and the switching cabinet are arranged in an electromagnetic station; the main loop circuit comprises a transducer, an input reactor, an output reactor, a breaker, a main loop fuse, a first AC contactor, a second AC contactor, a power-frequency control AC contactor, a first variable-frequency control AC contactor and a second variable-frequency control AC contactor; the transducer is arranged in the transducer cabinet; and the breaker, the main loop fuse, the first AC contactor, the second AC contactor, the power-frequency control AC contactor, the first variable-frequency control AC contactor and the second variable-frequency control AC contactor are arranged in the switching cabinet. Power frequency control, stopping, manual variable-frequency control and PLC control for two three-phase AC asynchronous motors can be achieved with one transducer; the quantity of the transducers is reduced; centralized control and monitoring can be achieved; the required operating personnel are few; the labor amount of the operating personnel is reduced; fault judgment is simple and clear; electrical maintenance and overhaul are convenient; the cost is saved; the operation is flexible; and the production rate of an enterprise is improved.

Description

technical field [0001] The invention belongs to the technical field of motor automation control, and in particular relates to a device for controlling three-phase AC asynchronous motors with one drive and two drives. Background technique [0002] In the metallurgical industry, ore dressing, copper dressing and other production processes are dominated by ore pulp transportation, and the equipment used is a low-voltage electrical cabinet, an operation box, a three-phase AC asynchronous motor and a pump; this control method is composed of an operation box and The installation of low-voltage electrical cabinets is relatively scattered, and only simple power frequency start and stop operations can be performed. The ore dressing and copper beneficiation production process in the metallurgical industry includes mining, screening, grinding, grading, sorting, concentration and other links, among which the pulp transportation is the main production process. The outflow of the mine bo...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the technical problem of the one-to-one control method in the prior art, to provide a frequency converter to realize power frequency control, stop, manual frequency conversion control and PLC control of two three-phase AC asynchronous motors and A low-cost, easy-to-maintain device for controlling three-phase AC asynchronous motors with one drive and two drives

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