LOW-RESISTANCE GROUNDING FOR ELECTRIC MOTORS

The integration of a conductive medium-filled hollow cylinder with rotating seals and a stationary metal tube provides an effective grounding mechanism for electric motor rotors, addressing the challenge of dissipating electrical charges and enhancing cooling and durability.

DE102024138239A1Pending Publication Date: 2026-05-07GM GLOBAL TECHNOLOGY OPERATIONS LLC
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Patent Information

Authority / Receiving Office
DE · DE
Patent Type
Applications
Current Assignee / Owner
GM GLOBAL TECHNOLOGY OPERATIONS LLC
Filing Date
2024-12-17
Publication Date
2026-05-07

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Abstract

An electric motor grounding system comprises a hollow cylinder filled with an electrically conductive medium. Rotating seals are attached to opposite ends of the hollow cylinder to retain the conductive medium within it. A rotor shaft is positioned within the electric motor, with the rotor shaft having a hollow center that accommodates the hollow cylinder. A metal tube is connected to an electrical ground. The metal tube slides through the hollow center of the cylinder, and the rotor shaft is conductively connected to the electrical ground through the metal tube and the conductive medium.
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Citation Information

Patent Citations

  • Shaft arrangement for a drive train and drive train with the shaft arrangement

    DE102020119718A1

  • MANAGING BEARING CURRENTS IN AN ELECTRIC MACHINE

    DE102023121813A1