Electromagnetic Actuator Auxiliary Circuit Diagnostics
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Solution Overview
Problem
Electromagnetic actuators with laminated ferromagnetic plates face issues with poor electrical conductivity at interfaces, preventing the flow of induced currents, which hampers diagnostic methods for wear and operating state estimation.
Innovation Solution
Incorporating an auxiliary magnetic circuit made of electrically conductive material allows induced currents to flow, generating an electromotive force that can be used for diagnostics without impairing the actuator's performance by maintaining low energy losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If laminated ferromagnetic plates are used to reduce manufacturing costs and improve performance, then manufacturing cost and performance are improved, but electrical conductivity at interfaces deteriorates, preventing induced current flow
Solution Approach 1:
The magnetic circuit is segmented into two distinct parts: the main magnetic circuit uses laminated ferromagnetic plates for cost-effectiveness, while the auxiliary magnetic circuit uses solid electrically conductive material for diagnostic current flow. This segmentation allows each part to optimize for its specific function without compromise.
Solution Approach 2:
The auxiliary magnetic circuit acts as an intermediary element that enables diagnostic current flow without interfering with the main magnetic circuit's operation. It provides a dedicated path for induced currents while the main circuit continues to use cost-effective laminated plates.
2Measurement precision
If induced currents are allowed to flow in the magnetic circuit for diagnostics, then diagnostic capability is improved, but energy losses increase due to excessive heat generation
Solution Approach 1:
The magnetic circuit is divided into a main operational circuit and an auxiliary diagnostic circuit. The auxiliary circuit is specifically designed to allow controlled induced current flow for diagnostics while the main circuit maintains efficient magnetic flux channeling, thus enabling diagnostics without excessive energy losses.
Solution Approach 2:
Different regions of the magnetic circuit have different material properties: the auxiliary magnetic circuit uses electrically conductive material locally where diagnostic currents need to flow, while other regions use laminated plates optimized for magnetic performance. This local differentiation enables diagnostics only where needed without compromising overall efficiency.
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 diagnostic methods for wear and operating state detection while maintaining the actuator's performance and reducing manufacturing costs by allowing induced currents to flow without excessive energy losses.
Implementation Method 1
an armature carrying at least one coil; a ferromagnetic yoke configured to channel a magnetic flux created by the coil
Implementation Method 2
an auxiliary magnetic circuit made of electrically conductive material, in order to permit the flow of currents induced in the auxiliary magnetic circuit when a magnetic field is generated by the coil
Implementation Method 3
The induced currents lead to a phase offset between the magnetic flux and the electric control current used to supply power to the coil, thereby generating an electromotive force visible on the voltage across the terminals of the coil
Data Source
AI summary
An electromagnetic actuator has:an armature carrying at least one coil;a ferromagnetic yoke configured to channel a magnetic flux created by the coil; anda ferromagnetic moving part that interacts with the yoke to form a magnetic circuit formed at least in part by an assembly of laminated metal plates, the moving part being configured to move in relation to the armature under the action of the magnetic field generated by the coil. The actuator moreover has an auxiliary magnetic circuit made of electrically conductive material, in order to permit the flow of currents induced in the auxiliary magnetic circuit when a magnetic field is generated by the coil.