Electric Compressor Inverter Bus Bar Vibration Damping
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Solution Overview
Problem
Electric compressors for vehicle air conditioners face issues with vibration resistance and noise due to the relative displacement of electronic components, which is unsatisfactory and does not meet stringent EMC standards.
Innovation Solution
An electric compressor design featuring a motor housing made of conductive material, an inverter with a board and electronic components supported by an insulating holder and integrated bus bar, and a tubular member pressed by a fastener to secure electrical connection and reduce vibration, enhancing vibration resistance and noise reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If electronic components are disposed in contact with the outer periphery of the motor housing, then the structure is simplified, but the vibration resistance becomes insufficient
Solution Approach 1:
The patent introduces a holder as an intermediary component between the electronic components and the motor housing. This holder provides a dedicated mounting structure that secures electronic components (such as the inverter) against the inner periphery of the motor housing, preventing direct contact while maintaining structural simplicity and improving vibration resistance.
2Volume of stationary object
If electronic components are mounted close to the motor housing, then the space utilization is improved, but the noise increases
Solution Approach 1:
The holder acts as a mediator that enables close mounting of electronic components to the motor housing while maintaining adequate spacing. By providing a structured mounting interface on the inner periphery, the holder allows optimal space utilization without direct contact that would generate noise, thus resolving the contradiction between space utilization and noise reduction.
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 design improves vibration resistance and reduces noise by securely fastening the bus bar to the motor housing, effectively grounding and stabilizing electronic components, thus meeting stricter EMC standards.
Implementation Method 1
a tubular member interposed between the cover and the bus bar, with the fastener inserted in the tubular member. A fastening force from the fastener causes the tubular member to press the bus bar toward the motor housing.
Data Source
AI summary
An electric compressor includes a motor housing, an inverter, a cover, and a fastener. The inverter includes a board; an electronic component; a holder composed of an insulating material, the holder containing the electronic component and supporting the board; a bus bar integrated with the holder, and electrically connected to a circuit pattern and the motor housing; and a tubular member interposed between the cover and the bus bar, with the fastener inserted in the tubular member. The fastening force from the fastener causes the tubular member to press the bus bar toward the motor housing.