Electric Compressor Terminal Layout for High-Current Cable Simplification
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Solution Overview
Problem
Existing electric compressors face challenges in handling increased current without increasing the number of external cables, leading to complex installation work due to multiple connection points.
Innovation Solution
The electric compressor design includes multiple hermetic terminals with insulation parts, pins, and straps connected to external cables through a connection mechanism with bus bars and linking cables, allowing for efficient current handling without additional external cables.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a plurality of pins are provided in one hermetic terminal to handle increased current, then the current handling capability is improved, but the number of connection points increases and installation work becomes complicated
Solution Approach 1:
The patent divides the hermetic terminal into multiple independent terminals, each with a single pin. This segmentation allows each terminal to be connected to external cables separately, reducing the complexity at each connection point while collectively handling increased current through the combination of multiple terminals.
Solution Approach 2:
The patent introduces a connection mechanism as an intermediary component that includes a terminal block with bus bars. This intermediary consolidates multiple pin connections internally, providing a simplified external interface that reduces the number of connection points while maintaining the current handling capability through multiple internal pins.
2Power
If the hermetic terminal unit is made large to handle increased current, then the current handling capability is improved, but the size of the insertion hole increases and reinforcement for pressure resistance is required
Solution Approach 1:
Instead of using one large hermetic terminal, the patent segments the current handling function across multiple smaller terminals. Each terminal has a manageable size with a single pin, allowing for smaller insertion holes that do not require additional reinforcement, while the collective arrangement of multiple terminals handles the increased current requirement.
3Power
If the cable is made thicker to handle increased current, then the current handling capability is improved, but the hermetic terminal unit becomes large
Solution Approach 1:
The patent avoids using a single thick cable by segmenting the current path into multiple thinner cables, each connected to a separate hermetic terminal with a single pin. This segmentation allows the use of thinner cables and smaller terminals, reducing the overall volume of the hermetic terminal unit while collectively handling the same increased current through the combination of multiple terminals.
Data Source
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AI summary
Provided is a compressor comprising a body (21) that accommodates an electric motor and a compression mechanism in a sealed space, a plurality of hermetic terminals (110, 120, 130) that are respectively inserted into a plurality of through-holes formed in the body (21), and a connection mechanism (200) that electrically connects the hermetic terminals to a respective plurality of external cables (310, 320, 330), wherein: the hermetic terminal (110) has a plurality of conductive pins which are inserted into an insulation part and a plurality of straps which are respectively fixed to the plurality of pins at one end of the pins; the connection mechanism (200) has a terminal block (240), a plurality of linking cables (251-259), and a plurality of bus bars (210, 220, 230) which each have each one of the external cables (310, 320, 330) respectively connected thereto; and each of the plurality of linking cables (251-259) is connected to each one of the plurality of bus bars (210, 220).