公开(公告)号：US20230101428A1

公开(公告)日：2023-03-30

申请号：US17485734

申请日：2021-09-27

Applicant: Rockwell Automation Technologies, Inc.

Inventor： Kyle B. Adkins ,  Andrew E. Carlson ,  David M. Messersmith ,  David Elmiger

IPC: H01H47/00 ,  H01H50/44 ,  H01H50/18

Abstract: A non-transitory, computer-readable medium may include instructions executable by at least one processor in a computing device to cause the processor to perform operations that include transmitting, to a first power source, a command to provide power to a coil of a switching device with a fixed current profile. The operations also include receiving one or more voltage measurements associated with the coil during a period of time, determining whether the voltage measurements associated with the coil indicate that one or more movable contacts of the switching device are at least partially welded to one or more contacts of an electric circuit, and transmitting an additional command to a second power source to disconnect a current to the coil in response to determining that the voltage measurements indicate that the movable contacts of the switching device are at least partially welded to the contacts of the electric circuit.

公开(公告)号：US11114842B1

公开(公告)日：2021-09-07

申请号：US16884318

申请日：2020-05-27

Applicant: Rockwell Automation Technologies, Inc.

Inventor： Yanbin Zhang ,  Yutao Wang ,  David M. Messersmith ,  David B. Berman

IPC: H02H7/00 ,  H02H7/22 ,  H03K5/24 ,  H02H1/00

Abstract: A component includes first and second switches in series and connected between a power source and a coil of contacts of a safety relay. A first controller controls the first switch with a close signal that closes the first switch or a first PWM signal that opens and closes the first switch on each PWM cycle. A second controller controls the second switch with a close signal that closes the second switch or a second PWM signal that opens and closes the second switch on each PWM cycle. A PWM sensing circuit connected to the coil sends a sensed PWM signal to an input of the first and second controllers. The first controller sends the first PWM signal while the second controller sends a close signal and vice-versa. The controllers verify that the received PWM signal matches the sent PWM signal.

公开(公告)号：US20240426914A1

公开(公告)日：2024-12-26

申请号：US18338940

申请日：2023-06-21

Applicant: Rockwell Automation Technologies, Inc.

Inventor： David Elmiger ,  Kyle B. Adkins ,  Andrew E. Carlson ,  David M. Messersmith

IPC: G01R31/327 ,  H01H47/00

Abstract: A system includes a relay system and a controller. The relay system includes a plurality of relays. The controller is configured to transmit a close signal to a first relay and a second relay of the plurality of relays. The close signal is configured to close the first contact and the second contact of each of the first relay and the second relay. The controller is also configured to measure a first close time between the transmission of the close signal to the first relay and a time when the first relay closes, and to measure a second close time between the transmission of the close signal to the second relay and a time when the second relay closes. The controller is further configured to determine whether an electrical weld exists in the first relay or the second relay, based on the first and second close times.

公开(公告)号：US09880223B2

公开(公告)日：2018-01-30

申请号：US14295123

申请日：2014-06-03

Applicant: ROCKWELL AUTOMATION TECHNOLOGIES, INC.

Inventor： David M. Messersmith ,  Douglas J. Bader ,  Haihui Lu ,  Thomas A. Nondahl ,  Zhenhuan Yuan

IPC: G01R31/34 ,  H02P23/14 ,  G01R27/08 ,  G01R27/26

CPC classification number: G01R31/343 ,  G01R27/08 ,  G01R27/2611 ,  H02P23/14

Abstract: A method of estimating stator resistance of an induction motor is provided. The method includes applying voltage pulses through two phase paths of the motor for a plurality of electrical cycles to inject current in the motor, wherein the voltage pulses are applied until rotor flux of the motor is substantially stabilized and measuring stator voltage and stator current in response to the applied voltage pulses for each of the plurality of electrical cycles. The method also includes calculating the stator resistance based upon the measured stator voltages and the stator currents.