公开(公告)号：US11329589B2

公开(公告)日：2022-05-10

申请号：US13842707

申请日：2013-03-15

Applicant: Joy Global Underground Mining LLC

Inventor： Peter M. Dalton ,  Michael Jordan

IPC: H02P27/04 ,  H02H3/17 ,  H02H3/16

Abstract: A mining machine including a motor, an adjustable speed drive providing a voltage to the motor, the voltage having an excitation component comprising a magnitude and a frequency for operating the motor at a desired speed and including an additional voltage component for use in detecting a ground fault condition, and a ground fault relay for detecting a ground fault current when the ground fault current exceeds a predetermined threshold.

公开(公告)号：US10925197B2

公开(公告)日：2021-02-16

申请号：US16576846

申请日：2019-09-20

Applicant: Joy Global Underground Mining LLC

Inventor： Peter M. Dalton

IPC: H05K9/00 ,  H02P27/04 ,  H02M1/32 ,  H01F27/24 ,  H03H7/01 ,  H01F27/30 ,  H02M1/12

Abstract: Methods and systems of suppressing ground faults. One system includes a power center including a transformer and a ground fault relay. The system also includes a first motor electrically connected to the power center. The system also includes a first variable speed drive connected to the first motor. The first variable speed drive is configured to vary the speed of the first motor. The system also includes a first common mode choke connected in a series-type connection between the power center and the first variable speed drive. The first common mode choke is configured to suppress a ground current induced by the first variable speed drive.

公开(公告)号：US20200100404A1

公开(公告)日：2020-03-26

申请号：US16576846

申请日：2019-09-20

Applicant: Joy Global Underground Mining LLC

Inventor： Peter M. Dalton

IPC: H05K9/00 ,  H02P27/04 ,  H02M1/32 ,  H01F27/30 ,  H01F27/24 ,  H03H7/01

Abstract: Methods and systems of suppressing ground faults. One system includes a power center including a transformer and a ground fault relay. The system also includes a first motor electrically connected to the power center. The system also includes a first variable speed drive connected to the first motor. The first variable speed drive is configured to vary the speed of the first motor. The system also includes a first common mode choke connected in a series-type connection between the power center and the first variable speed drive. The first common mode choke is configured to suppress a ground current induced by the first variable speed drive.