Magnetic Thermal Subassembly Equipotential Design
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Solution Overview
Problem
Existing circuit breakers face challenges in ensuring electrical insulation between magnetic and thermal actuators, leading to complex and costly plastic insulation solutions that are difficult to implement effectively, especially in compact designs.
Innovation Solution
Designing a magnetic and thermal subassembly where all components form a single current path at the same potential, eliminating the need for electrical insulation and simplifying the arrangement by integrating a magnetic actuator with a contact carrier, coil, movable pallet, and spring, which allows for precise tripping and easy manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional magnetic and thermal actuators are arranged separately with different potentials, then functional performance is achieved, but electrical insulation complexity and manufacturing cost increase significantly
Solution Approach 1:
The patent applies equipotentiality by electrically connecting all components of the magnetic actuator (coil, yoke, movable core) and thermal actuator (bimetallic strip, release lock) to the same potential through a common electrical connection. This eliminates potential differences between the two actuators, removing the need for complex insulation barriers and simplifying the overall device structure while maintaining functional performance.
2Reliability
If plastic insulation parts are integrated to protect components, then electrical isolation is achieved, but manufacturing complexity and assembly difficulty increase
Solution Approach 1:
The patent extracts and eliminates the need for plastic insulation parts by reconfiguring the electrical potential arrangement. Instead of using insulation barriers to separate components at different potentials, the design connects all actuator components to the same potential, removing the harmful factor (potential difference) that necessitated the insulation parts in the first place.
3Volume of moving object
If compact circuit breaker design is pursued, then space efficiency improves, but insulation implementation becomes more difficult
Solution Approach 1:
By establishing equipotential connections across all magnetic and thermal actuator components, the patent eliminates the need for insulation barriers that would consume valuable space in compact designs. This allows for more efficient space utilization while maintaining electrical safety, as components can be arranged more freely without requiring insulating structures between them.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution reduces component complexity, eliminates insulation challenges, and lowers manufacturing costs while ensuring reliable operation and ease of assembly, making the circuit breaker more attractive economically and reducing the risk of breakdowns.
Implementation Method 1
a coil surrounding part of the yoke and connected in series with the bimetallic strip
Implementation Method 2
the mobile core driving a striker in translation, striking a rocker which pivots by driving a movable contact holder, thus causing the opening of said movable contact
Implementation Method 3
a thermal release comprising a bimetallic strip capable of unlocking a mechanical lock of the device when an overload occurs in the line to be protected
Implementation Method 4
a thermal release comprising a bimetallic strip capable of unlocking a mechanical lock of the device
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The apparatus has a contact carrier (6) attached to a yoke (5) and carrying a movable contact (14). A coil (11) surrounds a portion of the yoke, and connected in series with a bimetallic strip (1). A blade (7) is rotated relative to the yoke and connected with pole surfaces of the yoke during short circuit. The yoke comprises a positioning and guiding unit for the blade. A drive unit is formed between the blade and the carrier for establishing correspondence between fraction of rotational movement of the blade and fraction of rotational movement of the movable contact. An independent claim is also included for a method for assembling a magnetic thermal sub-assembly integrated in an electrical apparatus.