Motor Stator Spring Arm Structure for Shock-Resistant Damping
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Solution Overview
Problem
Existing electric motors face issues with unreliable damping and decoupling of the stator from the motor housing, particularly during mechanical shocks, as spring arms can slide out of axial slots, leading to inadequate support or damping of tangential forces.
Innovation Solution
The electric motor incorporates spring elements with a plate-shaped spring main body and radial spring arms that engage in both axial slots of the stator and motor housing, featuring a stiffening contour to enhance tangential stiffness and ensure a form-fitting connection, preventing slippage under mechanical loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If spring arms are used to engage in axial slots for damping and decoupling the stator, then radial and anti-rotation protection is provided, but under mechanical shock loads the spring arms may slide out of the axial slots, making tangential force support unreliable
Solution Approach 1:
The spring arm is divided into multiple segments or sections with different cross-sectional properties along its length. This segmentation allows different portions of the spring arm to serve different functions: some sections provide flexibility for radial movement and damping, while other sections with increased stiffness or different geometry prevent slippage under tangential shock loads. The segmented design enables the single spring arm component to simultaneously address both radial decoupling and tangential force resistance.
2Ease of manufacture
If the spring arm geometry is simplified for ease of manufacture, then production cost decreases, but the ability to maintain form-fitting connection under load is reduced
Solution Approach 1:
The spring arm features local quality variations where specific sections have modified cross-sectional geometries, thicknesses, or profiles tailored to their functional requirements. Rather than making the entire spring arm complex, only critical regions undergo geometric modifications to enhance load-bearing capacity and prevent slippage. This localized approach maintains manufacturing simplicity for the majority of the component while providing enhanced performance where needed.
3Force
If the spring arm is made more flexible to improve radial damping, then radial decoupling performance increases, but tangential stiffness decreases, reducing resistance to slippage under shock loads
Solution Approach 1:
The spring arm is designed with dynamic characteristics that allow it to exhibit different effective stiffness values depending on the direction and magnitude of applied forces. Under normal radial damping conditions, the spring arm remains flexible to absorb vibrations. Under extreme tangential shock loads, geometric features or material properties cause the spring arm to stiffen or engage additional structural elements, preventing slippage. This dynamic adaptation enables the spring arm to optimize its mechanical properties based on operational conditions.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides reliable damping and decoupling of the stator, ensuring robustness against mechanical shocks, reducing structure-borne noise transmission, and maintaining stable anti-rotation protection, while being insensitive to assembly tolerances.
Implementation Method 1
spring elements inserted or insertable into a number of first axial slots (30) formed on a circumferential side in the stator main body (18)
Implementation Method 2
reliable damping and decoupling of the stator, ensuring robustness against mechanical shocks, reducing structure-borne noise transmission
Data Source
AI summary
An electric motor has a stator with a cylindrical stator main body with radially inwardly directed stator teeth and with a number of first axial slots formed on the circumferential side in the stator main body, and a motor housing for accommodating the stator. A number of second axial slots are provided on a housing inner wall and are arranged in alignment with the first axial slots. A spring element is provided, which has a spring main body which is inserted in a radially form-fitting manner into one of the first axial slots. A spring arm protrudes out of the spring main body and projects radially on the circumference of the stator main body. The spring arm has a stiffening contour along an arm longitudinal direction, which increases a tangential stiffness of the spring arm.