Reversible Terminal Box Assembly for Flexible Motor Wiring

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Solution Overview

Problem

Existing electrical machine assemblies have terminal boxes that are mounted in a single orientation, limiting the choice of wiring exit direction and lacking flexibility in mounting options.

Innovation Solution

A terminal box with a symmetrical and reversible base that allows for orientation change, featuring drainage troughs and seals to prevent moisture ingress, and a housing design with axial grooves for moisture drainage, combined with a cooling system using fans and fins for effective airflow.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the terminal box is mounted in a single fixed orientation, then the mounting structure is simple, but the wiring exit direction is limited and flexibility is reduced

Engineering Contradiction:

Improvemounting orientation flexibilityVSAvoidterminal box structure

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The terminal box base is designed with asymmetric features including a drain opening positioned at a specific location and drainage troughs arranged in particular patterns. These asymmetric elements create natural alignment references that enable the box to be mounted in multiple orientations while ensuring proper drainage function in each position, thus providing mounting flexibility without requiring complex additional mechanisms

Inventive Principle:

Principle #4Asymmetry

Solution Approach 2:

The terminal box is designed with a removable lid and a base that can be detached and reattached in different orientations. This dynamic design allows the terminal box to adapt its mounting position based on installation requirements, enabling flexible wiring exit directions while maintaining a relatively simple overall structure through modular components

Inventive Principle:

Principle #15Dynamics

2Reliability

If the terminal box includes drainage features and seals, then moisture protection is improved, but the manufacturing complexity increases

Engineering Contradiction:

Improvemoisture protectionVSAvoidterminal box base

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The base includes a drain opening positioned at a lowest point and drainage troughs that channel condensation toward the drain opening. Seals are positioned at interfaces between the terminal box and housing to prevent moisture ingress. By integrating these features into the base mold, the design achieves reliable moisture protection without significantly increasing manufacturing complexity

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS12470108B2Electric machine assembly having a rotatable terminal box

Publication Date: 2025.11.11 REGAL BELOIT AMERICA INC

AI summary

An electric machine assembly includes a housing having a first plurality of housing openings and a second plurality of housing openings. The electric machine assembly also includes a terminal box removably coupled to the housing, wherein the terminal box includes a base having a first plurality of base openings and a second plurality of base openings. The base is symmetrical and reversible in orientation between a first orientation and a second orientation.