Terminal Block Staging Feature for Cable Alignment
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Solution Overview
Problem
In electric-assisted turbomachinery applications, existing terminal block assemblies face challenges in efficiently and reliably connecting and isolating motor stator cables and controller cables, particularly in providing a waterproof and electrically insulated environment, which is crucial for rotating the rotor of compressors and ensuring safe and efficient air compression.
Innovation Solution
The proposed solution involves an electrical terminal block assembly with a base plate, conductive terminal bars, and a cover that includes a rib to prevent disengagement of fasteners, along with a method for assembling the terminal block assembly within a compressor housing, ensuring secure and waterproof connections between motor stator cables and controller cables, utilizing staging features and non-conductive materials for enhanced isolation and protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing terminal block assemblies are used to connect motor stator cables and controller cables, then electrical connections can be established, but the assembly lacks sufficient waterproof protection and electrical isolation
Solution Approach 1:
The patent combines multiple functions into a single integrated terminal block assembly that simultaneously provides electrical connections, waterproof protection, and electrical isolation. The assembly integrates terminal bars for connection, a non-conductive housing for isolation, and sealing features for waterproof protection, eliminating the need for separate protective components.
Solution Approach 2:
The non-conductive housing acts as an intermediary element that provides both electrical isolation between conductive parts and a sealed environment for waterproof protection. This single component mediates between the electrical connection requirements and the environmental protection requirements.
2Reliability
If conventional terminal blocks are used without additional fastening features, then assembly is simple, but fasteners can accidentally disengage compromising connection reliability
Solution Approach 1:
The terminal block assembly incorporates pre-designed rib features that extend toward the terminal block to prevent fastener disengagement. These preventive features are built into the assembly structure beforehand, eliminating the need for additional complex locking mechanisms while ensuring connection reliability.
3Manufacturing precision
If cable lugs are allowed to rotate freely during engagement, then assembly is easier, but proper alignment with terminal bars cannot be ensured
Solution Approach 1:
The base plate incorporates localized staging features at specific positions where cable lugs need to be aligned with terminal bars. These localized features provide rotational constraint only where needed for alignment, while allowing free movement elsewhere in the assembly.
Solution Approach 2:
The staging feature acts as an intermediary element between the cable lug and the terminal bar, providing temporary rotational constraint during assembly to ensure proper alignment, then releasing the constraint once alignment is achieved.
Data Source
AI summary
An electric motor-driven compressor having an electrical terminal block assembly and corresponding method of assembly are provided. The electrical terminal block assembly includes a base plate that has a staging feature for receiving a lug end of a motor stator cable prior to connection of the motor stator cable with a terminal bar of the terminal block assembly. In this way, once the terminal block assembly is lowered into the enclosure and the motor stator cable is no longer visible to the user, a stator cable fastener may be passed through a stator cable mounting hole in the terminal bar to engage the stator cable lug that is being held in the proper position by the staging feature of the base plate. Upon rotation of the stator cable fastener, the stator cable lug may be drawn into conductive engagement with the terminal bar.