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US 9,396,898 B2Granted
Multipole electromechanical switching device
AssigneeRockwell Automation Technologies, Inc.
InventorsJames J. Kinsella, Christopher J. Wieloch
Life of this patent
Estimating the term…
Abstract
A method and apparatus using electromagnetic switching in a two-step connection process is provided to minimize surge currents and torque oscillations in three-phase motors during starts.
Claims17
An electromechanical switching device, comprising:
- a plurality of poles each comprising a movable contact assembly for completing and interrupting current paths through the device;
- and
- a moving contact carrier having a plurality of pole windows in which respective movable contact assemblies are received;
- wherein one of the pole windows is offset with respect to two other pole windows for closing a movable contact assembly received in one pole window after other movable contact assemblies received in the two other pole windows, wherein each movable contact assembly comprises a moving contact, and wherein the moving contacts for all poles are the same as one another and do not require modification.
1 more element
An electromechanical switching device, comprising:
- first, second and third poles each comprising a movable contact assembly for completing and interrupting current paths through the device;
- and
- a moving contact carrier having three pole windows in which respective movable contact assemblies are received;
- wherein one of the pole windows is offset with respect to the other two pole windows for closing a movable contact assembly received in the one pole window later than the other movable contact assemblies received in the other two pole windows, wherein each movable contact assembly comprises a moving contact, and wherein the moving contacts for all poles are the same as one another and do not require modification.
1 more element
An electromechanical switching device, comprising:
- first, second and third poles comprising first, second, and third movable contact assemblies, respectively, for completing and interrupting current paths through the device;
- and
- a moving contact carrier having three pole windows comprising a first, outer pole window, a second, center pole window, and a third, outer pole window, the movable contact assemblies of the first, second and third poles being received in the first, second, and third pole windows, respectively;
- wherein the center pole window is offset with respect to the outer two pole windows for closing the second movable contact assembly at a later than the first and third movable contact assemblies, wherein each movable contact assembly comprises a moving contact, and wherein the moving contacts for all poles are the same as one another and do not require modification.
1 more element
Dependencies are inferred from the claim text.