Cooling Fan Attachment Structure with Vibration Damping
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Solution Overview
Problem
Conventional structures for attaching cooling fans to servomotors fail to effectively mitigate excessive vibration from loading devices and resonance, leading to potential damage of the cooling fans.
Innovation Solution
A structure that includes a fan attachment plate with cut-out holes for a tubular vibration-proof member, which is fixed between the ventilation cover and the cooling fan, reducing vibration transmission and regulating the natural frequency of the cooling fan support portion to prevent resonance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cooling fan is fixed directly or via a metal fitting to the casing or bracket, then the cooling fan is securely attached, but excessive vibration from loading devices and resonance can damage the cooling fan
Solution Approach 1:
A vibration-proof member (rubber or resin material) is introduced as an intermediary between the cooling fan and the casing/bracket. This mediator absorbs and attenuates vibration, preventing direct transmission of harmful vibrations while maintaining the attachment reliability of the cooling fan structure.
Solution Approach 2:
The natural frequency of the cooling fan support portion is regulated by changing the material properties and structural parameters of the vibration-proof member. By adjusting the stiffness and damping characteristics of the rubber or resin material, the system avoids resonance with the loading device vibration frequency, preventing vibrational damage.
2Strength
If a rigid metal fitting is used to attach the cooling fan, then the attachment is strong and stable, but it transmits excessive vibration from the loading device to the cooling fan
Solution Approach 1:
The vibration-proof member serves as a mediator that replaces the rigid metal fitting. It provides sufficient attachment strength while simultaneously absorbing vibration energy, thus preventing the transmission of excessive vibration to the cooling fan that would occur with a purely rigid connection.
Solution Approach 2:
The attachment structure uses composite materials combining rigid components (for structural strength) with flexible vibration-proof materials (for vibration absorption). This composite approach maintains attachment strength while reducing vibration transmission to the cooling fan.
3Device complexity
If the cooling fan is rigidly mounted to the casing, then the structure is simple and stable, but resonance between the loading device vibration frequency and the cooling fan support natural frequency can occur
Solution Approach 1:
The vibration-proof member is introduced as a simple intermediary component between the cooling fan and the rigid casing structure. This addition regulates the natural frequency of the support system, preventing resonance with the loading device while maintaining overall structural simplicity and stability.
Solution Approach 2:
By changing the material parameters of the vibration-proof member (rubber or resin), the natural frequency of the cooling fan support portion is adjusted to avoid resonance with the loading device vibration frequency. This parameter regulation prevents resonant damage while keeping the attachment structure relatively simple.
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 proposed structure effectively attenuates vibrations from loading devices and resonance, thereby preventing damage to the cooling fan by using a vibration-proof member to absorb and redirect excessive vibrations, ensuring the cooling fan operates efficiently without damage.
Implementation Method 1
a tubular vibration-proof member supported by the cut-out hole of the fan attachment plate and fixed to the ventilation cover
Implementation Method 2
regulating the natural frequency of the cooling fan support portion to prevent resonance
Implementation Method 3
the servomotor is provided with a cooling fan for suppressing the increase in temperature of the coil
Data Source
AI summary
A structure for attaching a cooling fan includes: a fan attachment plate interposed between a ventilation cover of a servomotor and the cooling fan and having a cut-out hole; and a tubular vibration-proof member supported by the cut-out hole of the fan attachment plate and fixed to the ventilation cover.