Electric compressor
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Solution Overview
Problem
The connection strength between lead terminals of a motor and an inverter circuit section in electric compressors is weak, leading to connection failures due to a reduction in holding force caused by creep phenomena.
Innovation Solution
The electric compressor employs a connection terminal system where the inverter circuit section has terminal connection portions with screw grooves, and a flat plate terminal portion is fixed to the inverter circuit section using a nut, providing mechanical fastening and improved electrical connection, while a pressure contact terminal portion connects to the motor lead terminals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a terminal plate press-contact structure or screw-fixed bus bar assembly is used to connect lead terminals of a motor and an inverter circuit section, then the assembly process is simplified or the structure is compact, but the connection strength is weak and connection failure occurs due to reduction in holding force from creep phenomenon
Solution Approach 1:
The inverter circuit section is provided with terminal connection portions having screw groove portions in advance, and the connection terminal is provided with a flat plate terminal portion that can be fixed by a nut. This preliminary preparation of threaded connections eliminates the need for complex assembly processes while ensuring strong, reliable connections that resist creep phenomenon, thereby resolving the contradiction between ease of manufacture and connection strength.
2Reliability
If the inverter circuit section is provided with terminal connection portions having screw groove portions and the connection terminal is fixed with a nut, then the connection strength is improved, but the device complexity increases
Solution Approach 1:
The terminal connection portion is integrally resin-molded with the sleeve assembly, merging the connection terminal structure with the insulating sleeve into a single integrated component. This integration reduces the number of separate parts and assembly steps while maintaining the strong mechanical fastening capability provided by the screw groove and nut, thus resolving the contradiction between improved connection strength and reduced device complexity.
3Device complexity
If the terminal connection portion is integrally resin-molded with the sleeve assembly, then the number of parts is reduced and assembly is simplified, but the manufacturing precision requirements increase
Solution Approach 1:
The terminal connection portion and sleeve assembly are integrated through resin molding, creating a composite structure that combines metallic threaded portions with insulating resin material. This composite approach allows the metallic screw groove portions to provide precise threading while the resin matrix provides structural support and insulation, distributing the manufacturing precision requirements across different material properties and reducing overall complexity.
Data Source
AI summary
An electric compressor is provided in which the connection strength between lead terminals from a motor and an inverter circuit section is improved. The electric compressor 1 is constituted by electrically connecting lead terminals 24 to 26 of a motor and an inverter circuit section 3 for supplying power to the motor by a motor side connection terminal 28. The inverter circuit section 3 is protrusively provided with terminal connection portions 19 to 21 each having a screw groove portion. The motor side connection terminal 28 has a flat plate terminal portion. The flat plate terminal portion is fixed to the inverter circuit section 3 by a nut 91 screwed into each of the screw groove portions of the terminal connection portions 19 to 21 and electrically connected to the inverter circuit section 3 in that state.