Electromagnetic Drive Unit With Adjustable Flux for Rapid Switch-Off
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Solution Overview
Problem
Existing switching devices face challenges in achieving rapid switch-off, particularly in cases of short circuits, due to limitations in controlling magnetic flux and requiring additional permanent magnets.
Innovation Solution
An electromagnetic drive unit with a magnetic core and coils arranged transversely to form a magnetic frame structure, allowing adjustable magnetic flux to move an armature between states, enabling rapid switching without additional permanent magnets by controlling magnetic flux through coordinated excitation and de-excitation of coils.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If traditional switching devices are used, then the structure is simple, but rapid switch-off capability is insufficient particularly in short circuit cases
Solution Approach 1:
The magnetic core is segmented into three separate magnetic paths (first, second, and third magnetic paths) arranged transversely. Each magnetic path can be independently controlled by its corresponding coil, allowing selective excitation to achieve rapid switch-off. The magnetic paths are coupled at ends to form a magnetic frame structure, enabling independent control of different magnetic circuits for optimized switching performance.
Solution Approach 2:
The magnetic flux through the magnetic paths is made adjustable and controllable in real-time. By dynamically exciting or de-exciting the first and second coils, the magnetic flux distribution can be changed to rapidly move the armature between states. This dynamic control allows the system to adapt to different operating conditions including short circuits, achieving rapid switch-off when needed.
2Speed
If additional permanent magnets are added to achieve rapid switching, then switching speed improves, but device complexity and cost increase
Solution Approach 1:
The patent replaces the need for permanent magnets with an electromagnetic system using coils and adjustable magnetic flux. Instead of relying on fixed magnetic fields from permanent magnets, the system uses controllable electromagnetic fields generated by the first and second coils. This substitution allows dynamic control of magnetic flux to achieve rapid switching without adding permanent magnet components.
Solution Approach 2:
The magnetic flux through the magnetic paths is made variable and controllable by changing the excitation parameters of the coils. By adjusting the current in the first and second coils, the magnetic flux distribution can be optimized for different switching states. This parameter control enables rapid switching dynamics without requiring additional permanent magnets, as the magnetic field strength and distribution are dynamically adjusted.
3Reliability
If magnetic flux is not properly controlled, then switching reliability is poor, but controlling magnetic flux requires complex coordination between coils and magnetic core
Solution Approach 1:
The magnetic frame structure with three magnetic paths creates inherent feedback mechanisms. The coupling of magnetic paths at their ends allows magnetic flux to distribute and balance across the structure. When coils are excited or de-excited, the magnetic flux changes are automatically distributed through the coupled magnetic paths, providing self-regulating feedback that enhances switching reliability. The inclined pole surface and gap further provide positional feedback for accurate armature positioning.
Solution Approach 2:
The three magnetic paths serve multiple functions simultaneously: they provide separate control channels for different switching states, create a coupled magnetic frame structure for flux distribution, and enable both make and break operations through selective excitation. The first and second coils can independently control different magnetic paths, allowing the system to achieve multiple switching functions with a unified magnetic core structure, reducing overall system complexity.
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
Enables rapid and reliable switching between on and off states with fast switching dynamics, safe operation, and avoidance of damage from short circuits, while minimizing costs and complexity.
Implementation Method 1
a magnetic flux that flows through the magnetic paths to move the armature between the first and the second state
Implementation Method 2
a magnetic flux that flows through the magnetic paths to move the armature between the first and the second state
Data Source
AI summary
An electromagnetic drive unit for a switching device includes: a magnetic core with a first, a second, and a third magnetic path each arranged transversely with respect to a longitudinal axis of the electromagnetic drive unit and coupled to longitudinal magnetic struts at respective ends to form a magnetic frame structure; an armature movable along the longitudinal axis between a first and a second state; and a first and a second magnetic coil for moving the armature based on excitation of the first and/or the second magnetic coil. The first magnetic coil is arranged between the first and the second magnetic path and the second magnetic coil is arranged between the second and the third magnetic path with respect to the longitudinal axis. The magnetic core and the magnetic coils are arranged such that a magnetic flux that flows through the magnetic paths to move the armature is adjustable.