Method and system for testing the functionality of an electrical insulation of phases of an electric machine

By locking the rotor and applying electrical impulses to test electric machine phases, the method addresses the inefficiencies of existing insulation testing, allowing for early defect detection and reducing workshop visits, enhancing vehicle safety and maintenance efficiency.

DE102023114874B4Active Publication Date: 2026-05-28AVL LIST GMBH
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Patent Information

Authority / Receiving Office
DE · DE
Patent Type
Patents
Current Assignee / Owner
AVL LIST GMBH
Filing Date
2023-06-06
Publication Date
2026-05-28

AI Technical Summary

Technical Problem

Existing methods for testing the electrical insulation of electric vehicle drive systems are costly, time-consuming, and often occur too late, leading to undetected damage and potential hazards, with limited opportunities for routine checks outside workshops.

Method used

A method involving locking the rotor of an electric machine, applying electrical impulses to its phases, measuring the impulse response, comparing it to predefined values, and outputting a test result to assess insulation functionality, which can be performed by the vehicle itself without additional components.

Benefits of technology

Enables cost-effective, frequent, and efficient testing of electrical insulation outside workshops, detecting defects early and reducing the need for workshop visits, with the potential for remote initiation and detailed defect analysis.

✦ Generated by Eureka AI based on patent content.

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Patent Text Reader

Abstract

Method (100) for testing the functionality of an electrical insulation of phases (20) of an electric machine (14) of an electric drive system (12) for a motor vehicle (10), wherein the method (100) is characterized by the following steps: - Locking (102) a rotor (18) of the electric machine (14) against a rotational movement, - Applying (104) at least two phases (20) of the electric machine (14) with at least one electrical impulse, - Measuring (106) an impulse response between the at least two phases (20) of the electric machine (14) which are subjected to at least one electrical impulse, - Comparing (108) the measured impulse response with at least one predefined impulse value, wherein the at least one predefined impulse value is indicative of the functionality of the electrical insulation of the at least two phases (20) of the electric machine (14), and - Output (110) of a test result of the functionality of the electrical insulation of at least two phases (20) of the electric machine (14) based on the comparison.
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Citation Information

Patent Citations

  • Insulation diagnosing device, insulation diagnosing method, and insulation diagnosing program

    JP2020020611A

  • JP002020020611A