Motor Driven Compressor Bent Bus Bar Connector
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Solution Overview
Problem
Existing motor-driven compressors with axial arrangements of compression mechanisms, electric motors, and motor driver circuits face increased size issues due to the radial extension of connector holders, leading to larger sealing areas and circuit board sizes.
Innovation Solution
A motor-driven compressor design with a bent bus bar and integrated connector holder within the housing, allowing the bus bar to extend towards the electric motor while maintaining the circuit board within the housing, reducing the need for large mounting holes and sealing areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the connector holder extends radially outward from the housing at a position adjacent to the inverter, then the connector can be provided, but the entire size of the compressor is increased in the radial direction
Solution Approach 1:
The connector holder is repositioned to extend axially along the rotary shaft axis instead of radially outward. This dimensional change allows the connector to be accessible while preventing increase in the radial size of the compressor, directly resolving the technical contradiction.
2Ease of manufacture
If the circuit board extends beyond the outer peripheral surface of the housing into the cylindrical portion, then the bus bar can be connected to the circuit board, but the housing needs to have a large mounting hole and a large cover, resulting in an increased sealing area
Solution Approach 1:
The circuit board is extracted from the housing and mounted on the outer peripheral surface instead of extending beyond it. The bus bar connection is achieved through a mounting hole that does not require a large cover, thereby reducing the sealing area while maintaining ease of manufacture for bus bar connection.
3Ease of operation
If the connector holder extends outward from the housing in radial direction at a position adjacent to the inverter and then along the axis of the rotary shaft in the direction away from the electric motor, then the connector can be positioned, but the entire size of the compressor is increased in the axial direction
Solution Approach 1:
Instead of extending the connector holder away from the electric motor along the axial direction, the design inverts the approach by mounting the circuit board on the outer peripheral surface and positioning the connector holder to extend axially toward the electric motor side, thereby reducing the axial size while achieving proper connector positioning.
Data Source
AI summary
A motor-driven compressor includes a housing having at one end thereof an accommodation space, an electric motor, a motor driver circuit provided in the accommodation space and having a circuit board, a connector having a bus bar electrically connected to the circuit board, and a cylindrical portion located at the one end of the housing and extending toward the direction close to the electric motor. The housing has a mounting hole communicating with the accommodation space and the interior of the cylindrical portion. The bus bar has a bent shape having opposite ends extended toward the direction close to the electric motor. The connector is disposed in the mounting hole with one end of the bus bar inserted in the cylindrical portion and the other end of the bus bar inserted in the accommodation space. The mounting hole is closed up by a cover with a seal member provided therebetween.