A protection mechanism and method for an EPS motor rotor magnet
CN122178650APending Publication Date: 2026-06-09HANGZHOU KEDE MAGNETIC COMPONENTS CO LTD
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- HANGZHOU KEDE MAGNETIC COMPONENTS CO LTD
- Filing Date
- 2024-12-07
- Publication Date
- 2026-06-09
AI Technical Summary
Technical Problem
In existing EPS motors, the interference fit between the stainless steel sleeve and the magnet causes the permanent magnet to generate weak magnetism, which reduces the motor's back EMF, increases the rotor weight, generates eddy current effects, and affects the motor's performance.
Method used
Kevlar fiber is wound onto the surface of the rotor magnet using a winding device, and ST-150HP adhesive is used for low-temperature curing to form a protective layer to prevent demagnetization at high temperatures. A robotic arm is used to ensure smooth winding and adhesion.
Benefits of technology
It improves the uniformity of the motor's magnetic field and output torque, reduces eddy current losses, decreases rotor inertia, and enhances the motor's efficiency and safety.
✦ Generated by Eureka AI based on patent content.
Smart Images
Figure CN122178650A_ABST
Abstract
The application discloses a protection mechanism and method for an EPS motor rotor magnet, relates to the technical field of rotor protection, and comprises a rotor, winding equipment and a workbench, the outer surface of the rotor is divided into a first magnet segment, a second magnet segment and a third magnet segment by the permanent magnets, and the outer surfaces of the first magnet segment, the second magnet segment and the third magnet segment are sequentially wound with Kevlar fiber threads by the winding equipment; in the application, Kevlar fiber threads are used on the EPS motor rotor, a layer of glue is coated on the Kevlar fiber threads after the Kevlar fiber threads pass through a glue box provided with ST-150HP, the Kevlar fiber threads are wound on the magnet surface by the equipment, the ST-150HP has low-temperature curing characteristics, and the demagnetization of the permanent magnet due to high temperature is prevented; due to the high tensile strength, high toughness, temperature resistance, low density of the Kevlar fiber thread material and the high toughness, temperature resistance and moisture resistance of the ST-150HP, even if the rotor generates high temperature under high speed, the winding effect of the Kevlar fiber threads will not be affected, so that the safety of the EPS motor is ensured.
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