Flat Motor Cable Assembly Vibration Absorption
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Solution Overview
Problem
The existing motor cable assemblies transfer vibrating motion from the motor to the fixing components, leading to structural looseness, noise, and potential damage to the inverter-side connecting member due to their rigid structure, which lacks effective vibration absorption.
Innovation Solution
A motor cable assembly with a flat-shaped cable main body formed by bundling cables in parallel and covered with a braid and a protective strip member, featuring a resin vibration-absorbing portion to absorb motor vibrations and shocks, preventing damage to the inverter-side connecting member.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the cable main body is structured with a round cross-section to have large stiffness, then the cable main body has high structural strength, but the cable main body cannot have effective vibrating motion to absorb vibration
Solution Approach 1:
The cable main body is changed from a round cross-section to a flat cross-section. This asymmetric shape change reduces the moment of inertia about one axis, enabling the cable to bend more easily and vibrate effectively to absorb motor vibrations, while still maintaining sufficient structural strength for its function.
Solution Approach 2:
The geometric parameters of the cable main body are changed by forming a flat cross-section instead of a round one. This parameter change directly affects the stiffness characteristics, allowing the cable to have appropriate flexibility for vibration absorption while maintaining necessary strength.
2Stability of the object's composition
If fixing components are provided to control cable vibrating motion, then cable stability is improved, but the fixing components cannot be provided in case due to car structure limitations
Solution Approach 1:
The cable main body itself is designed to absorb vibrations through its flat cross-section geometry, eliminating the need for separate fixing components. The cable serves its own vibration control function, simplifying the overall structure while maintaining stability.
Solution Approach 2:
The vibration control function is extracted from separate fixing components and integrated into the cable main body's geometry. This eliminates the need for additional fixing components that cannot be installed due to car structure limitations.
3Strength
If the cable main body has large stiffness, then structural strength is improved, but vibration force acts on the inverter-side connecting member causing damage or reduced connection reliability
Solution Approach 1:
The flat cross-section creates asymmetric stiffness characteristics that allow the cable to vibrate and absorb energy, reducing the transmission of vibration forces to the inverter-side connecting member while maintaining adequate structural strength.
Solution Approach 2:
By changing the geometric parameters to create a flat cross-section, the cable's stiffness distribution is optimized to absorb vibrations locally, preventing excessive vibration forces from reaching the connecting members.
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 flexible cable main body effectively absorbs vibrations and shocks, preventing damage and reliability issues at the inverter-side connecting member while allowing stable cable support, thus enhancing the motor cable assembly's performance.
Implementation Method 1
the cable main body is moved so as to absorb the vibrating motion
Data Source
AI summary
A motor cable assembly connecting a motor and an inverter includes a cable main body, which can move flexibly. The cable main body is manufactured and formed into a flat shape by arranging a plurality of cables in parallel in a row, covering an outer surface of the arranged cables with a braid, and covering further an outer surface of the covered cables. The motor cable assembly includes an inverter-side protector having a vibration absorbing portion supporting the cable main body at a position near the inverter-side connecting member so as to absorb the vibrating motion of the cable main body.