Vehicle Electric Compressor Weight Layout for Resonance Shift
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Solution Overview
Problem
Existing electrically-driven compressors for vehicles face challenges in reducing size while minimizing vibration and noise, particularly when their resonance frequencies coincide with those of the engine, leading to increased noise and vibration, and traditional methods to shift these frequencies, such as thickening the housing or adding reinforcement ribs, result in increased size.
Innovation Solution
The compressor includes a housing with a weight made of a material with higher specific gravity than the housing itself, attached to the discharge chamber, which shifts the resonance frequency of the compressor relative to the engine, thereby reducing vibration and noise without increasing the compressor's size. This weight is strategically placed in the discharge chamber, utilizing existing space and maximizing the distance from the electric motor's center of gravity, allowing efficient placement and reducing the overall size of the compressor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the wall of the housing is thickened or reinforcement ribs are added to shift the resonance frequency, then the resonance frequency of the compressor is shifted from that of the engine, but the size of the compressor increases
Solution Approach 1:
The patent changes the mass parameter of the compressor system by attaching a weight to the housing, which shifts the resonance frequency without changing the structural dimensions. This allows the resonance frequency to be adjusted independently of the compressor size, resolving the contradiction between reducing vibration and maintaining compact size.
Solution Approach 2:
The patent uses a weight attached to the housing as a countermeasure to shift the resonance frequency. This weight acts as a counterbalancing element that modifies the dynamic characteristics of the compressor, allowing resonance frequency adjustment without increasing the structural size of the housing or adding reinforcement elements.
2Object-affected harmful factors
If a weight is attached to the housing to shift resonance frequency, then vibration and noise are attenuated, but the complexity of the device increases
Solution Approach 1:
The patent segments the vibration control function from the main compressor structure by using a separate, detachable weight. This allows the weight to be independently attached or removed, simplifying the overall design and maintenance while achieving vibration attenuation without permanently modifying the compressor structure.
Solution Approach 2:
The patent uses a simple mass addition approach rather than complex structural modifications. By changing only the mass parameter through an attached weight, the solution avoids the need for complex reinforcement structures, maintaining design simplicity while achieving the desired vibration control.
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
This configuration effectively attenuates vibration and noise by shifting the resonance frequencies, achieves size reduction, and allows for easy replacement or modification of the weight, ensuring optimal placement without increasing the compressor's profile or causing heat-related deformations.
Implementation Method 1
a resonance frequency of the electrically-driven compressor for a vehicle is shifted relative to a resonance frequency of the engine where the electrically-driven compressor for a vehicle is installed
Data Source
AI summary
An electrically-driven compressor is installed on an engine. Refrigerant is compressed with rotation of a rotating shaft in a compression unit. An electric motor is coupled to the rotating shaft and drives the compression unit through the rotating shaft. A housing accommodates the compression unit, the electric motor, and the motor drive circuit aligned in the listed order in the axial direction of the rotating shaft. The housing is internally provided with the discharge chamber through which the refrigerant compressed by the compression unit is discharged. A weight is attached to the housing and disposed in the discharge chamber in a manner that a resonance frequency of the electrically-driven compressor is shifted relative to a resonance frequency of the engine, the weight including a material having a specific gravity greater than a specific gravity of a constituent material of the housing.