Enclosed Rotating Machine Lead Sealing Without Terminal Interference
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Solution Overview
Problem
The interference of rubber plugs with the connection process of bus bars to terminal blocks in enclosed rotating electric machines is a challenge, as they can obstruct the connection process.
Innovation Solution
An enclosed rotating electric machine design featuring a lead insertion portion with protective members that seal the gap between the through hole and the lead, accommodated in the lead insertion space, allowing the leads to be drawn out without interference from the connection process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rubber plug is used to seal the gap between the through hole and the lead, then the sealing function is improved, but the connection process of the bus bar to the terminal block is interfered with
Solution Approach 1:
The sealing function is divided into two separate components: the rubber plug that seals the gap between the through hole and lead, and the protective member that guides and protects the lead. This segmentation allows the rubber plug to focus on sealing without interfering with the connection process, while the protective member handles lead guidance and protection.
Solution Approach 2:
The protective member acts as an intermediary component between the lead and the terminal block connection area. It provides a smooth transition path for the lead and prevents the rubber plug from protruding into the connection space, thereby mediating between the sealing requirement and the connection operation.
2Reliability
If the protective member extends long to ensure lead protection, then the lead integrity is improved, but the protective member may protrude and interfere with the connection process
Solution Approach 1:
The protective member has varying properties along its length: the first portion has a larger outer diameter for guiding and protecting the lead in the lead insertion space, while the second portion has a smaller outer diameter that fits through the through hole without interfering with the terminal block connection area. This local quality variation allows the protective member to provide adequate protection without protruding into the connection space.
3Reliability
If the rubber plug is fitted tightly to seal the gap, then the sealing function is improved, but the connection portion of the bus bar cannot be easily connected to the terminal block
Solution Approach 1:
The sealing and protection functions are segmented into separate components. The rubber plug provides tight sealing in the through hole, while the protective member provides a smooth guiding surface that facilitates the insertion and connection of the bus bar to the terminal block, thereby resolving the conflict between tight sealing and ease of assembly.
Data Source
AI summary
An enclosed rotating electric machine includes a stator, and coil ends; a lead drawn out from one of the coil ends; a connection terminal; a pair of end brackets; a lead insertion portion having a through hole; a terminal block to which the connection terminal is fastened, and that is disposed at a position to which the through hole is opened so that the terminal block is aligned with the through hole in the axial direction of the stator; a protective member that is inserted through the through hole and into which the lead is inserted, protects a portion of the lead, and seals a gap between the through hole and the lead. The protective member is accommodated in the lead insertion portion so that the protective member extends from the through hole toward an inner portion of the lead insertion space.