Laminated Electromagnetic Actuator Reduces Eddy Current Losses
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Solution Overview
Problem
Miniature circuit breakers (MCBs) experience excessive losses and overheating due to higher-order harmonics in power electronics applications, leading to potential failure, as existing designs are not optimized to handle these frequencies effectively.
Innovation Solution
An electromagnetic actuator with an electrically conductive armature and core made of magnetizable material, coupled by a magnetic field and an electric coil, incorporates an electrically conductive layer to reduce eddy current losses by directing induced currents away from the core and armature, using materials like copper or aluminum for high conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If solid steel core and armature are used in the electromagnetic actuator, then magnetic coupling and force generation are improved, but eddy current losses increase significantly under higher-order harmonics
Solution Approach 1:
The solid steel core and armature are segmented into thin laminated layers insulated from each other. This segmentation interrupts the path of eddy currents, reducing their magnitude and associated energy losses while maintaining the magnetic coupling effectiveness between core and armature.
Solution Approach 2:
The electrical resistance parameter of the core and armature paths is changed by introducing insulating layers between conductive laminations. This increases the effective resistance to eddy current flow, reducing power losses under harmonic conditions while preserving magnetic force generation capability.
2Device complexity
If the electromagnetic actuator is designed for mains frequency only, then device simplicity is maintained, but performance deteriorates under higher-order harmonics from power electronics
Solution Approach 1:
The actuator components are segmented into laminated structures that specifically address harmonic frequency effects. This segmentation adds minimal structural complexity while significantly improving reliability under power electronics-generated harmonic conditions by reducing eddy current losses.
Solution Approach 2:
Different regions of the actuator are given different structural qualities - the core and armature use laminated construction to reduce eddy currents, while maintaining solid magnetic pathways. This local differentiation allows the actuator to handle harmonic frequencies effectively without over-complicating the overall design.
3Temperature
If eddy current losses are reduced through material or structural changes, then overheating is prevented, but manufacturing complexity increases
Solution Approach 1:
The core and armature are constructed from stacked laminated sheets that can be manufactured separately and assembled. This segmentation approach prevents overheating by reducing eddy currents while maintaining relatively simple manufacturing processes through standard lamination techniques used in electrical machine construction.
Solution Approach 2:
The actuator uses composite construction combining conductive magnetic material layers with insulating layers. This composite structure reduces eddy current losses and prevents overheating while using well-established manufacturing methods for laminated electrical components, balancing thermal management with manufacturing ease.
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
The solution significantly reduces electrical losses and prevents overheating, maintaining the actuator's robustness and compact size, even under high-frequency harmonic conditions, thereby extending the MCB's operational lifespan and reliability.
Implementation Method 1
an electric coil configured to generate the magnetic field
Implementation Method 2
eddy currents induced to the electrically conductive material of the electromagnetic actuator by the generated magnetic field
Data Source
Figure 1
Figure 2a~2b
Figure 3~5
AI summary
An electromagnetic actuator for triggering a circuit breaker, is provided with: an electrically conductive armature comprising magnetizable material, wherein the armature is movable arranged within the electromagnetic actuator for triggering the circuit breaker; an electrically conductive core comprising magnetizable material, configured to be operational coupled to the armature by a magnetic field; an electric coil configured to generate the magnetic field; and an electrically conductive layer configured and arranged within the electromagnetic actuator to reduce electrical losses of eddy currents induced to the electrically conductive material of the electromagnetic actuator by the generated magnetic field.