Electromagnetic Actuator with Magnetic Path Control for Bias Current Reduction
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Solution Overview
Problem
Electromagnetic actuators face limitations in the magnitude of current supply due to heat generation issues, making it challenging to maintain a stable initial floating state with increased support weight.
Innovation Solution
The electromagnetic actuator design incorporates a biased permanent magnet, a magnetic path control device, and a coil system to adjust and reinforce or cancel the magnetic path, allowing for reduced bias current requirements and enhanced stability in achieving the initial floating state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a high bias current is supplied to the coil to increase support weight, then the support capability is improved, but heat generation increases
Solution Approach 1:
The patent introduces a magnetic path control device that adjusts the magnetic path length and magnetic flux distribution. By changing the magnetic path parameters (length, cross-sectional area) and controlling the magnetic flux density distribution, the system achieves the required support force with a lower bias current, thereby reducing heat generation in the coil while maintaining the electromagnetic force F = BIL.
2Force
If a high bias current is supplied to achieve increased support weight, then the support capability is improved, but the stability of initial floating state becomes difficult to achieve
Solution Approach 1:
The magnetic path control device functions as a feedback control mechanism that continuously adjusts the magnetic path configuration in response to load changes. By detecting the magnetic flux requirements and automatically adjusting the magnetic path length and flux distribution, the system maintains stable floating state without requiring high bias currents, enabling easy and stable achievement of the initial floating state.
3Force
If the magnetic path length is increased to reduce magnetic flux density, then the magnetic force is improved, but the coil requirements increase
Solution Approach 1:
The patent applies local quality by creating non-uniform magnetic flux density distribution through the magnetic path control device. Instead of uniformly increasing the magnetic path length throughout, the device selectively adjusts the magnetic path configuration in specific regions where it is most effective, thereby achieving the required magnetic force with minimal coil modifications and reduced overall device 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
This design reduces the magnitude of the bias current needed, minimizing heat generation and enabling stable floating operations even with increased load, while maintaining efficient magnetic flux management.
Implementation Method 1
a magnetic path control device which is disposed to adjust a magnetic path produced by the biased permanent magnet
Implementation Method 2
a coil which is wound on the at least one core so as to reinforce or cancel the magnetic path produced by the biased permanent magnet
Data Source
AI summary
An electromagnetic actuator includes a first body which includes a biased permanent magnet, a magnetic path control device which is disposed to adjust a magnetic path produced by the biased permanent magnet, at least one core which is disposed to face the biased permanent magnet and the magnetic path control device, and a coil which is wound on the at least one core so as to reinforce or cancel the magnetic path produced by the biased permanent magnet; and a second body which is separated from the biased permanent magnet and the magnetic path control device when the at least one core is between the second body and at least one of the biased permanent magnet and the magnetic path control device.