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Multifunctional composite contactor

A compound contact and multi-functional technology, applied to starters, starter components, motor generators/starters, etc. of a single multi-phase induction motor, can solve problems such as high cost and cost increase

Inactive Publication Date: 2006-01-18
LG IND SYST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0060] In summary, it allows 10 times the inrush current for 0.6 seconds (approximately 3 cycles at 60 Hz) with a solid state circuit controller that requires a capacity 2-3 times higher than the rated current capacity cost of the semiconductor switching device, and the cost of the product will be increased

Method used

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Examples

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Embodiment Construction

[0079] A multifunctional composite contactor according to a preferred embodiment of the present invention will now be described in detail with reference to the accompanying drawings.

[0080] Fig. 6 is a block diagram of a multifunctional composite contactor according to a preferred embodiment of the present invention.

[0081] The multifunctional compound contactor 600 according to this invention is a device for controlling the starting, running or stopping of the AC motor 300, and the compound contactor 600 can be used together with a circuit breaker 400 which is connected in series to 3-phase power lines (R, S, T), and interrupt the circuit when overcurrent or leakage occurs on the circuit between the AC power supply and the AC motor 300; a relay 100 is used to control the driving of the AC motor 300; And, a relay contact 200, which is switched-controlled by the relay 100 into a stop position or an open position.

[0082] The relay 100 is magnetized by a control signal out...

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Abstract

A multi-functional hybrid contactor has a motor protection function against an abnormal state in addition to the starting, running and stopping of the motor, the same effect as the case that an electronic motor protection relay (EMPR) is connected in parallel can be obtained with only one multi-functional hybrid contactor. Also, the size of the product is remarkably reduced compared to the case that the electric motor protection relay (EMPR) is connected in parallel, and its cost can be reduced. In addition, since the semiconductor switch is turned on only in the initial stage of starting and stopping, the rated current capacity and size of the semiconductor switch can be considerably reduced compared to the conventional soft starting method in which the semiconductor switch is used for controlling of all of starting, running and stopping.

Description

technical field [0001] The present invention relates to a multifunctional composite contactor, more particularly to a multifunctional composite contactor, which has the function of an electronic motor protection relay (EMPR) and selectively starts in a direct start mode or a soft start mode The function of the starter motor. Background technique [0002] Generally, the method of starting the motor includes: a direct starting method using a relay and a relay contact to directly supply a power supply voltage to the motor; a soft starting method using a semiconductor switching device. [0003] The direct starting method has a problem in that, since the power supply voltage is directly supplied to the motor, a large amount of inrush current is generated when the power is supplied to damage the motor and contacts of the contactor. [0004] In order to protect the motor from damage caused by inrush currents during starting, a method has been proposed to improve the direct startin...

Claims

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Application Information

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IPC IPC(8): H02P1/26H02P1/04H02H7/09H01H9/54H02H7/08H02H9/00H02P25/04
CPCH02P25/04H02H7/08H01H9/542H02H9/001H01H2009/543H02H7/09
Inventor 郑容昊
Owner LG IND SYST CO LTD
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