Layered Terminal Structure for Rotary Machine Fastening
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Solution Overview
Problem
The existing terminal connection structures for rotary machines face challenges in maintaining sufficient axial force and mechanical strength while reducing terminal rigidity, as increasing cross-sectional area to decrease electric resistance leads to high rigidity and insufficient fastening, and enlarging the terminal shape without thickness increases installation space requirements.
Innovation Solution
A terminal connection structure featuring a layered terminal with plate-shaped conductor portions, where the first and second conductor portions are stacked in the same direction as the fastening member's axis, providing a connection portion with higher rigidity and mechanical strength for secure fastening to the terminal block, while the layered portion maintains a low rigidity and required cross-sectional area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal is increased in thickness to increase the cross-sectional area, then the electric resistance decreases, but the rigidity becomes high and the axial force of the fastening member becomes insufficient
Solution Approach 1:
The patent transitions from increasing thickness (one dimension) to increasing width (another dimension) to achieve the required cross-sectional area. This allows the terminal to maintain low electric resistance while keeping thickness small, thereby maintaining low rigidity and ensuring sufficient axial force from the fastening member.
Solution Approach 2:
The patent changes the dimensional parameters of the terminal from thickness-oriented to width-oriented expansion. By making the terminal wide in the width direction rather than thick in the thickness direction, the terminal achieves the necessary cross-sectional area for low electric resistance while maintaining flexibility and compatibility with the fastening member's axial force.
2Strength
If the terminal is made large in shape without increasing thickness, then the rigidity is reduced, but the installation space needs to be increased
Solution Approach 1:
The patent applies different dimensional characteristics to different regions of the terminal. The terminal is designed to be wide in the width direction (providing large cross-sectional area) but thin in the thickness direction (providing low rigidity). This localized dimensional quality allows the terminal to meet both requirements: sufficient electrical conductivity and flexibility for installation.
3Reliability
If the terminal is increased in cross-sectional area to decrease electric resistance, then the electric current capacity increases, but the terminal rigidity becomes high and mechanical strength becomes insufficient
Solution Approach 1:
The patent resolves this contradiction by changing the direction of dimensional increase from thickness to width. The terminal achieves large cross-sectional area through increased width rather than thickness, thereby maintaining both high electric current capacity and low rigidity for sufficient mechanical strength in the fastening direction.
Data Source
AI summary
A terminal connection structure for a rotary machine which electrically connects the rotary machine and a terminal block of a power control unit, comprises a terminal including a layered portion connected to a winding of the rotary machine and formed by layering at least a first conductor portion and a second conductor portion; and a fastening member fastening the terminal and the terminal block of the power control unit.