Motor Driven Blower Support System Vibration Damping
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Solution Overview
Problem
Blowers used in cooling devices generate resonance noise due to changes in the rotating speed of the drive motor, which causes vibrations that coincide with the resonance frequency of support members, leading to noise generation.
Innovation Solution
A blower design that incorporates a damping member, such as vibration-proof rubber, to support the drive motor, ensuring the resonance frequency of the support member is above a predetermined frequency, thereby preventing the transmission and resonance of vibrational components, and includes resonance frequency adjustment sections to fine-tune the resonance frequencies of the support and drive motor components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the rotating speed of the drive motor is changed to adjust air volume, then the cooling performance is improved, but resonance noise is generated when the vibration frequency coincides with the resonance frequency of the support member
Solution Approach 1:
A damping member is introduced as an intermediary element between the drive motor and the support member. This damping member absorbs and dissipates vibrational energy, preventing the transmission of motor vibrations to the support member. The damping member acts as a mediator that decouples the vibration source from the resonant structure, thereby eliminating resonance noise while preserving the motor's speed adjustment capability for cooling performance
2Stability of the object's composition
If the drive motor is firmly supported to reduce vibration transmission, then structural stability is improved, but resonance noise is generated when vibration frequency matches support member resonance frequency
Solution Approach 1:
The damping member serves as an intermediary support element that maintains structural stability while preventing resonance. Rather than creating a rigid direct connection that transmits vibrations, the damping member provides mechanical support with vibration-isolating properties, allowing the motor to be firmly supported without coupling the support structure to resonant frequencies
Solution Approach 2:
The support characteristics are changed by introducing a damping member with specific vibration-damping properties. This changes the dynamic parameters of the support system, transforming it from a rigid connection that transmits resonance to a compliant connection that absorbs vibrations, thereby maintaining stability while preventing resonance noise
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
Effectively prevents the generation of resonance noise by damping vibrations above the predetermined frequency, ensuring the support member does not resonate even when the drive motor's frequency changes, thus maintaining operational silence.
Implementation Method 1
a damping member (45) for damping vibration, the frequency of which is not less than a predetermined frequency (f)
Implementation Method 2
the frequency of the magnetic vibration is changed according to the rotating speed. This magnetic vibration is caused by a periodic change in a magnetic force generated by a stator coil arranged in the drive motor
Implementation Method 3
a resonance frequency adjustment section (44a) for adjusting a resonance frequency of the support member (43, 44)
Data Source
AI summary
A drive motor is supported and fixed onto a motor support plate composing a support member through vibration proof rubber which damps vibration, the frequency of which is not less than 1 kHz. Due to the foregoing, it becomes difficult for the vibration generated from the drive motor itself, to be transmitted to the support member so that the generation of resonance noise can be prevented.