Electric Compressor Circuit Board Strain Suppression
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Solution Overview
Problem
The existing technology for fixing a control board to a main body housing using a bolt results in high stress and increased strain, which can cause issues with electronic components and reduce the precision of durability evaluation during thermal shock tests.
Innovation Solution
An electric compressor design that includes a driving circuit assembly with a first and second holder, where a heat-generating component is mounted on the first holder and a housing portion accommodates electronic components, using screw members to fasten the holders to the housing and displace the first holder towards a heat radiation surface for efficient heat dissipation while reducing stress on the circuit board.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the control board is fixed to the installation surface of the main body housing by the bolt, then the control board is securely fixed, but stress acting on the control board becomes large and strain is increased
Solution Approach 1:
The fixing structure is segmented into two independent parts: the control board fixing bolts and the heat-generating component fixing bolts. The heat-generating component (IGBT) is directly fixed to the main body housing, while the control board is fixed separately. This segmentation allows the control board to be secured without transmitting excessive stress through the same fixing path, thereby reducing strain on the control board while maintaining secure fixation.
2Temperature
If the heat-generating component is directly fixed to the main body housing, then heat radiation is improved, but the control board may be damaged due to stress
Solution Approach 1:
The fixing structure is divided into separate paths: heat-generating components are directly fixed to the main body housing for efficient heat radiation, while the control board is fixed independently. This segmentation ensures that thermal management and structural fixation are decoupled, allowing heat dissipation without compromising control board reliability.
Solution Approach 2:
The main body housing serves as an intermediary structure that directly receives heat from the heat-generating components through direct contact fixation. This intermediary structure enables efficient heat transfer to the housing while isolating the control board from thermal and mechanical stress, thereby protecting the control board while improving heat radiation.
3Temperature
If the control board is fixed to the installation surface, then the power system unit is pressed against the installation surface for heat exchange, but the strain may cause trouble in electronic components and decrease precision of durability evaluation
Solution Approach 1:
The heat exchange function is separated from the control board fixation. Heat-generating components are directly fixed to the main body housing to maintain efficient heat exchange, while the control board is fixed independently without being part of the heat exchange path. This eliminates strain-induced positioning errors that would otherwise affect thermal shock test precision.
Solution Approach 2:
The main body housing acts as an intermediary for heat exchange, directly contacting heat-generating components without involving the control board. This intermediary structure enables effective thermal management while isolating the control board from thermal and mechanical stress, ensuring precise durability evaluation during thermal shock tests.
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 design effectively radiates heat generated by electronic components and suppresses strain on the board, enhancing the durability evaluation and precision of thermal shock tests.
Implementation Method 1
a housing portion that accommodates the plurality of electronic components and that receives heat conduction from the heat-generating component
Implementation Method 2
the heat generated in the power system unit is radiated
Implementation Method 3
the first holder is displaced toward the housing portion and therewith the heat-generating component mounted on the first holder is pressed against a heat radiation surface of the housing portion
Data Source
AI summary
There is provided an electric compressor in which strain of a board can be suppressed. A first holder is supported by a circuit board and an inverter circuit is mounted thereon. A second holder is supported by the circuit board and an electromagnetic coil is mounted thereon. The inverter circuit mounted on the first holder generates a larger amount of heat than that generated by an electronic component mounted on the second holder. A collar is attached to the first holder. Another collar is attached to the second holder. In a state in which a bolt does not fasten the first holder and the inverter housing, the collar is disposed away from the inverter housing. In a state in which the bolt fastens the first holder and the inverter housing, the inverter circuit is pressed against a heat radiation surface of the inverter housing.