Insulated Motor Gear Assembly for Circuit Breaker Reliability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing circuit breakers face challenges in maintaining insulation performance between the motor and gear components due to electrical connections, which affect operational reliability and require additional insulation methods without increasing manufacturing time or costs.
Innovation Solution
A motor assembly structure is introduced with a bush member and cover member made of insulating materials, positioned between the shaft and gear components to prevent electrical connections, ensuring insulation and rigidity while minimizing manufacturing changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the motor gear and gear unit are formed of steel material to guarantee rigidity, then rigidity is improved, but electrical connection between the motor and gear unit occurs
Solution Approach 1:
An insulating member is introduced as an intermediary component between the motor shaft and the motor gear. This insulating member prevents direct electrical contact between the steel motor gear and the motor shaft while allowing mechanical power transmission through rotational coupling. The insulating member acts as a mediator that resolves the contradiction by enabling both rigidity (through steel gear) and insulation (through the intermediate insulating component).
2Reliability
If insulation methods are added to prevent electrical connection between motor and gear, then insulation performance is improved, but device complexity increases
Solution Approach 1:
The insulating member is designed to perform multiple functions simultaneously: it provides electrical insulation between the motor shaft and motor gear, transmits rotational motion through its coupling structure, and maintains the mechanical integrity of the power transmission system. By making the insulating member multi-functional, the patent avoids adding separate components for each function, thereby improving insulation performance without significantly increasing device complexity.
3Reliability
If additional insulation components are introduced, then insulation performance is improved, but manufacturing time and costs increase
Solution Approach 1:
The insulating member is constructed using composite material structures that combine insulating properties with mechanical strength requirements. By using composite materials, the single insulating member can simultaneously provide electrical insulation and sufficient mechanical strength for power transmission, eliminating the need for separate insulation components and reducing manufacturing complexity and costs.
Data Source
AI summary
Disclosed are a motor assembly and a circuit breaker comprising same. According to an embodiment of the present invention, the motor assembly includes a cover member and a bush member formed of an insulating material. The bush member and the cover member physically and electrically space apart a motor and a gear member from each other. Here, the gear member is formed of a steel material and therefore maintains durability. Accordingly, the motor assembly can have improved insulation performance while maintaining operation reliability and rigidity.