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Multipole electromechanical switching device

A technology of electromechanical switches and disconnection positions, applied in the direction of electric switches, circuits, relays, etc., can solve the problems of large installation and configuration, short service life, and complexity

Active Publication Date: 2014-09-17
ROCKWELL AUTOMATION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although alternatives to starter motors exist that reduce or eliminate these negative attributes, such as motor drives and electronic soft starters, these alternatives are typically larger, more expensive, more complex to install and configure, and have Shorter service life than electromechanical starters

Method used

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  • Multipole electromechanical switching device
  • Multipole electromechanical switching device
  • Multipole electromechanical switching device

Examples

Experimental program
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Embodiment Construction

[0027] When magnetic contactors are used to start an induction motor from standstill, the motor typically draws between six and ten times the motor full load current (FLC) starting current from the supply, depending on the size and construction of the motor. As the motor approaches full speed, this current drops to a smaller value commensurate with the load on the motor.

[0028] However, many undesired phenomena also occur during the simultaneous connection of the power supply to the motor. There is a severe oscillatory pulsation of the torque generated by the motor which can last up to several seconds in larger motors. This imposes high mechanical stresses on the entire drive system (especially on the couplings, gearboxes, bearings and stator windings) through the reaction forces experienced. The peak value of the pulsating torque can be either positive or negative and can be a multiple of the maximum torque experienced under normal operation. This pulsating torque is an i...

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PUM

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Abstract

An electromechanical switching device 200, comprising: a plurality of poles 16,17 each comprising a movable contact assembly for completing and interrupting current paths through the device 200; and a moving contact carrier 7 having a plurality of pole windows 16,17,18 in which respective movable contact assemblies are received; wherein at least one of the pole windows 16,17,18 is offset with respect to at least one other pole window for opening and / or closing a movable contact assembly received in the at least one pole window at a different time than at least one other movable contact assembly received in the at least one other pole window.

Description

technical field [0001] The present disclosure relates generally to the control, protection and starting of three-phase electric motors and drive equipment, and more particularly to the two-step connection of electric motors by means of electromagnetic switches. Background technique [0002] The vast majority of three-phase motor starters are simple devices that use contactors that substantially simultaneously connect and disconnect all phases of the three-phase power to the motor. Simultaneous application of such three-phase power results in high peak inrush currents and torque ripples that place excessive and potentially damaging stress on the power distribution network, motors, and driven loads. These inrush currents are in addition to the normal in-rush current and can damage the electrical contacts used in the starter contactor and shorten the life of the starter. In order to avoid nuisance trips due to higher peak currents due to these inrush currents, it is common pra...

Claims

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Application Information

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IPC IPC(8): H01H50/16H01H50/44H01H50/54H02P23/00
CPCH01H9/563H01H50/90H01H1/2016H01H50/546H01H50/54
Inventor 詹姆斯·J·金塞拉克里斯托弗·J·温洛克
Owner ROCKWELL AUTOMATION TECH