Electric Compressor Motor Housing Ribs for Rigidity and Cooling
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Solution Overview
Problem
The existing vehicle-mounted electric compressor motor housings face issues with insufficient rigidity on the side portions, leading to deformation, vibration, and noise, as well as inadequate cooling performance due to restricted heat transfer, which degrades the performance of the inverter circuit components.
Innovation Solution
The motor housing incorporates ribs protruding outward and extending vertically on the side surfaces to enhance rigidity without increasing wall thickness, increasing the cross-sectional area for heat transfer and improving cooling performance, while also providing additional structural support and protection against external factors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the wall thickness of the motor housing is reduced, then the weight is reduced, but the rigidity on both side portions is insufficient causing deformation and vibration
Solution Approach 1:
The patent adds ribs extending in the vertical direction (perpendicular to the side surfaces) to the motor housing. This introduces a new dimensional feature that increases rigidity without increasing wall thickness, resolving the contradiction between weight reduction and strength maintenance.
Solution Approach 2:
The motor housing is segmented into multiple regions with different structural features. The side portions specifically receive rib reinforcements while other areas maintain thinner walls, allowing localized strength enhancement without overall weight increase.
2Quantity of substance
If the inverter accommodating portion is defined to have a larger width, then the space for heat-releasing components is increased, but the heat-releasing is restricted by the thickness of the wall portion increasing heat-passing resistance
Solution Approach 1:
The patent extends ribs vertically from the side surfaces of the motor housing, creating additional heat transfer pathways in the vertical dimension. This allows the inverter accommodating portion to be wider while maintaining effective heat dissipation through the extended rib surfaces that protrude into the refrigerant flow path.
Solution Approach 2:
The patent changes the geometric parameters of the heat transfer structure by adding vertical ribs, which increases the effective heat transfer surface area and alters the heat flow path. This reduces heat-passing resistance despite the increased width of the inverter accommodating portion.
3Strength
If ribs are added to the outer peripheral side surface, then the rigidity is increased and heat transfer area is increased, but the device complexity is increased
Solution Approach 1:
The patent merges multiple functions into the rib structure: it simultaneously provides mechanical reinforcement to increase rigidity and creates additional heat transfer surface area. This consolidation achieves multiple benefits through a single structural feature, minimizing the increase in device 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 configuration increases the rigidity of the motor housing, reduces vibration and noise, enhances cooling performance of the inverter circuit components, and improves the overall reliability and handling of the electric compressor, while preventing refrigerant leakage and protecting against impacts.
Implementation Method 1
Heat-releasing components included in the inverter circuit are cooled by releasing the heat from the components to the refrigerant flowing through the refrigerant passages via the inverter accommodating portion and a wall portion (heat transfer portion) of the motor housing
Data Source
AI summary
An electric compressor motor housing is provided with: a motor housing main body (8), the interior of which is a cylindrical space for internally equipping a motor, and in which a plurality of refrigerant passages are formed around the cylindrical space, in the direction of the motor axis; an inverter accommodating portion (17) provided in an upper portion of the outer periphery of the motor housing main body (8); compressor attachment feet (19) provided in a plurality of locations in upper and lower portions of the outer periphery of the motor housing main body (8); and a refrigerant intake port (16) provided on a side surface toward the rear end of the motor housing main body (8); wherein one or more lines of ribs (24) are provided on the outer peripheral side surface of the motor housing main body (8), protruding outward and extending in the vertical direction.