Silicon controlled rectifier stator voltage-regulation and speed-regulation parallel operation electric control system

Abstract

The invention provides a silicon controlled rectifier stator voltage-regulation and speed-regulation parallel operation electric control system. The system comprises power supply devices and drive devices, wherein each power supply device is formed by connecting a change-over switch and a silicon controlled rectifier stator voltage-regulation and speed-regulation device in series; and each drive device consists of a change-over switch, an electric motor, a rotor resistor and a contactor. The system is characterized in that: three power supply devices and two drive devices are provided; and output voltages regulated by the three power supply devices are connected with the two drive devices for supplying power after being connected in parallel. By the system, the problem of non-synchronous speed or unbalanced current when double motors are operated in a transmission system of a large-scale lifting mechanism and the problem of the self-backup of a single control system are solved; a requirement on a normal operational state is met; and relative national standards and the requirement on avoiding the work stoppage of an overall production line by finishing a work cycle, short-time low-speed operation or the like by still driving the electric motor when one power supply device or one motor is in an accident state in the system disclosed by a user are met in different switching modes of the devices and the motors.

Description

technical field [0001] The invention belongs to the electric transmission control technology of voltage regulation and speed regulation, and in particular relates to a thyristor which satisfies large-capacity and multiple motors in large-scale hoisting and transportation machinery, and needs speed regulation, and has a three-to-two mode for stable low-speed operation. Stator voltage regulation and speed regulation electrical control system. Background technique [0002] A large foundry crane for hoisting liquid metal ladles or ladles is used in ironmaking or steelmaking workshops in the metallurgical industry. According to the relevant national standards, the mechanical transmission system of the main hoisting mechanism for hoisting ladles must be driven by two motors. Once one motor fails, the other motor can still work alone for a cycle in a short time (at least can complete the lowering operation), put the liquid metal package on the support surface safely and smoothly. ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the defect that the capacity of the thyristor stator voltage regulating and speed regulating device of the prior art cannot meet the insufficient capacity of a large-tonnage crane during one-to-two operation, and to provide a voltage-regulating and speed-regulating Device failure can also enable the main hoisting mechanism of large cranes to continue to complete a working cycle of the three-drag two-mode thyristor stator voltage-regulating and speed-regulating electrical control system

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