Invention Grant
- Patent Title: Multimotor variable frequency overload
- Patent Title (中): 多电动变频超载
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Application No.: US13834500Application Date: 2013-03-15
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Publication No.: US09001476B2Publication Date: 2015-04-07
- Inventor: John Blakely , Gregory A Helton , Mark Innes
- Applicant: Rockwell Automation Technologies, Inc.
- Applicant Address: US OH Mayfield Heights
- Assignee: Rockwell Automation Technologies, Inc.
- Current Assignee: Rockwell Automation Technologies, Inc.
- Current Assignee Address: US OH Mayfield Heights
- Agency: Kunzler Law Group
- Main IPC: F21V7/04
- IPC: F21V7/04 ; H02H6/00 ; H02H7/08 ; H02H7/085 ; H02P29/00 ; G01R31/34 ; H02H3/00

Abstract:
An apparatus for protecting a motor includes two or more motor overloads, within a motor overload enclosure, protecting two or more motors. Each motor overload includes one or more current sensors where each current sensor includes a magnetic core and each current sensor includes a conductor positioned within the magnetic core where the conductor providing power to a motor protected by the two or more motor overloads (“protected motor”). Each motor overload includes a motor trip module that stops current flow to the protected motor in response determining that a thermal state of the protected motor has reached a thermal limit. Determining that the protected motor has reached a thermal limit includes using a current signal from at least one current sensor of the one or more current sensors that senses current of the protected motor to determine a thermal state of the protected motor.
Public/Granted literature
- US20140268432A1 MULTIMOTOR VARIABLE FREQUENCY OVERLOAD Public/Granted day:2014-09-18
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