Stator Wiring Ring Screw-Nut Receptacle for Tolerance Compensation
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Solution Overview
Problem
Existing electric machines face challenges in efficiently and reliably connecting stator winding wire ends to power electronics units due to mechanical and electrical connection limitations, particularly in systems with high tolerance variations and limited installation space.
Innovation Solution
An interconnection ring with groove-like recesses and busbars that utilize a screw connection with a loosely mounted screw nut in a plastic receptacle, allowing for elastic compensation of tolerance variations and improved assembly, featuring a pot-shaped receiving space for insulation and anti-rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rigid screw connection is used to connect busbars to power electronics units, then the electrical connection is stable, but the assembly difficulty increases due to tolerance variations and limited installation space
Solution Approach 1:
The patent changes the mechanical parameters of the screw connection by allowing the screw nut to move within a defined range in the receptacle. This transforms the rigid fixed-position connection into a flexible adjustable connection, enabling the connection point to adapt to tolerance variations while maintaining electrical stability
Solution Approach 2:
The receptacle acts as an intermediary element between the busbar and the screw nut. It provides a receiving space that guides and constrains the screw nut's movement, mediating between the rigid busbar structure and the flexible connection requirement, thus facilitating easier assembly while maintaining connection reliability
2Volume of moving object
If the installation space is reduced to integrate more subsystems, then the device compactness improves, but the accessibility for mechanical-electrical connection deteriorates
Solution Approach 1:
The patent utilizes the receptacle's receiving space to create a third dimension for the screw nut's movement. Instead of requiring lateral accessibility in the limited installation plane, the connection adjustment is achieved through axial movement within the receptacle's depth, effectively using another dimension to solve the accessibility problem in compact spaces
Data Source
AI summary
A wiring ring for a stator of an electric machine, including a housing having a plurality of slot-like recesses and a plurality of in particular annular or annular segment-like busbars which are arranged in the slot-like recesses. The busbars are designed to establish an electrical contact between the winding wire ends of the stator windings and the contact connections of a power electronics unit for controlling the electric machine. At least one of the bus bars contact to the contact connections of the power electronics unit is implemented via a busbar connection region by means of a screw connection. According to the disclosure, the screw connection has a nut which can be arranged loosely in a receptacle space of a receptacle underneath a through-hole in the busbar connection region.