Inverter-Integrated Electric Compressor Vibration Isolation
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Solution Overview
Problem
Existing inverter-integrated electric compressors fail to completely prevent control circuit board vibrations, leading to potential component displacement due to external vibrations, which compromises the reliability of the motor drive circuit.
Innovation Solution
The integration of a board-fixing section with electrically insulative elastic board vibration-isolating members, which are inserted through through-holes in the control circuit board and bonded to the board-fixing section or frame member, along with the use of an electrically insulative filler to seal and stabilize the components, effectively preventing bending and vibration of the control circuit board.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the control circuit board is fixed directly to the housing without vibration isolation, then the structure is simple and easy to manufacture, but the control circuit board vibrates and bends under external vibration, causing component displacement and reduced reliability
Solution Approach 1:
A board vibration-isolating member made of electrically insulative elastic material is introduced as an intermediary between the control circuit board and the board-fixing section. This vibration-isolating member absorbs external vibrations and prevents them from transmitting to the control circuit board, thereby stabilizing the board and its components without requiring complex fixing structures
Solution Approach 2:
The board vibration-isolating member is installed in advance between the control circuit board and the board-fixing section to provide preemptive vibration isolation. This cushioning structure is designed to absorb and attenuate external vibrations before they can cause bending or displacement of the control circuit board components
2Reliability
If elastic members are disposed between the control board and supporting projections, then vibration is reduced to some extent, but the control board still vibrates under strong external vibration, and components may fall away
Solution Approach 1:
The board vibration-isolating member serves as an intermediary that specifically targets and isolates the control circuit board from external vibrations. This dedicated vibration-isolating component provides enhanced protection compared to general elastic members, preventing component displacement even under strong vibration conditions
Solution Approach 2:
The board vibration-isolating member is made of electrically insulative elastic material with specific vibration isolation properties. By selecting materials and structures with appropriate elastic characteristics, the vibration isolation performance is optimized to handle strong external vibrations while maintaining electrical insulation
3Reliability
If gel-like resin material is used to fill the inverter box, then vibration suppression is enhanced, but the structure becomes more complex and the manufacturing process is more difficult
Solution Approach 1:
Instead of using gel-like resin material that requires filling and curing processes, a board vibration-isolating member made of pre-formed elastic material is used as an intermediary. This approach achieves similar or better vibration suppression while simplifying the manufacturing process, as the vibration-isolating member can be directly installed without complex filling operations
4Reliability
If the printed circuit board is clipped between structural body and top lid, then vibration resistance is enhanced, but the structure becomes more complex and assembly is more difficult
Solution Approach 1:
A board vibration-isolating member is introduced as an intermediary between the control circuit board and the board-fixing section, providing vibration isolation without requiring the control board to be clipped between structural components. This simplifies the fixing structure while maintaining vibration resistance
Solution Approach 2:
The vibration isolation function is segmented into a dedicated board vibration-isolating member, separating the vibration isolation function from the structural fixing components. This allows the control circuit board to be simply mounted on the board-fixing section via the vibration-isolating member, reducing overall structural complexity
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 solution significantly reduces the vibration of the control circuit board and its components, enhancing the reliability and performance of the inverter-integrated electric compressor by securely fixing the board and components within the compressor housing, even in environments prone to external vibrations.
Implementation Method 1
a board vibration-isolating member for board vibration-isolating, which is made of an electrically insulative elastic material, is provided so as to interpose between the control circuit board and the board-fixing section
Implementation Method 2
a board vibration-isolating member for board vibration-isolating, which is made of an electrically insulative elastic material
Data Source
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AI summary
An inverter-integrated electric compressor configured in such a manner that a motor is incorporated within a compressor, a control circuit board is provided to an inverter section which is provided with a motor drive circuit for driving the motor, and electric component parts including the control circuit board is fixed within a containment space surrounded by a compressor housing, wherein the control circuit board is fixed within the housing space through a board-fixing section, and a board vibration-isolating member, said board vibration-isolating member consisting of an electrically insulative elastic material, is provided between the control circuit board and the board-fixing section. A frame member having a convcave holding section may be loaded on the control circuit board, and a board vibration-isolating member, said board vibration-isolating member consisting of an electrically insulative elastic material, may be provided between the control circuit board and the frame member. The inverter-integrated electric compressor has highly reliable performance and configured in such a manner that the vibration of the control circuit board of the motor drive circuit is suppressed as much as possible.