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Device and method for time sequence open-phase control of three three-phase asynchronous motors

A three-phase asynchronous, motor technology, applied in the direction of controlling multiple AC motors, can solve the problems of new system failure, construction difficulty, construction cost increase, etc., to reduce equipment failure rate, save material costs and construction costs, improve Effects of operating conditions

Active Publication Date: 2012-10-03
ANGANG STEEL CO LTD
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  • Claims
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AI Technical Summary

Problems solved by technology

These newly added power cables lead to construction difficulties and greatly increased construction costs, and also add new system failures

Method used

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  • Device and method for time sequence open-phase control of three three-phase asynchronous motors

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Embodiment Construction

[0034] The device of the present invention controls three three-phase asynchronous motors with time-sequential phase loss, and is composed of a main control box 1, a sub-control box 2 and a three-phase asynchronous motor M.

[0035] The main control box 1 includes a control unit, a fuse E, an automatic switch QF, a contactor KM and a three-phase three-wire system power line L-L.

[0036] The auxiliary control box 2 includes an AC contactor KM and a three-phase three-wire power line L-L.

[0037]Three sets of fuses E1, E2, and E3 in the main control box 1 are sequentially connected to the live wire inlet sides L1, L2, and L3 of the three-phase three-wire system power line, and the live wires at the output terminals of fuses E1, E2, and E3 are L1 / 1, L2 / 1, L3 / 1; automatic switch QF1, automatic switch QF2, automatic switch QF3 use wires and connect to three-phase live wires L1 / 1, L2 / 1, L3 / 1; automatic switch QF1 output line is a three-phase power line 1L1, 1L2, 1L3; automatic swi...

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Abstract

The invention provides a device and a method for time sequence open-phase control of three three-phase asynchronous motors. The device mainly comprises a main control box 1, a secondary control box 2 and three-phase asynchronous motors M, wherein the main control box 1 comprises a control unit, a fuse E, an automatic switch QF, a contactor KM and a three-phase three-wire power cord; and the secondary control box 2 comprises an alternating current contactor KM and a three-phase three-wire power cord. The time difference given by three phases of a power supply is determined according to the sequence of the contactor KM; and different loads are selected by a control system according to the difference of the time sequences given by three phases of the power supply. According to the device and the method disclosed by the invention, operation conditions of equipment and the operation environment of maintainers can be effectively improved, the fault rate of the equipment is reduced, the safety accident rate of the maintainers is reduced, a large amount of cables and noble cable pulleys are omitted and the expenses of materials and construction are greatly saved.

Description

technical field [0001] The invention belongs to the field of automatic control, and in particular relates to a device and method for time-sequential phase-loss control of three three-phase asynchronous motors used in the fields of electric cranes, remote pumps and fans. Background technique [0002] In some industrial and military fields, electrical components such as electric cranes, remote pumps and fans are located in locations with harsh environments and complex terrains. [0003] In such an environment, electronic control equipment has more failures and shorter lifespan due to vibration, dust, and humid air; if the equipment is repaired in these places, people will also be in an unsafe state. [0004] In order to reduce the failure rate of electrical equipment, increase the service life of electrical equipment, and create a safe environment for maintenance personnel, it is necessary to move the electrical equipment that controls these loads to a place with good environm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P5/74
Inventor 杜茂庆刘海
Owner ANGANG STEEL CO LTD
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