Electromagnetic Linear Drive with Magnetized Masses and Ferromagnetic Screen
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Solution Overview
Problem
Electromagnetic linear drive devices face inefficiencies due to suboptimal magnetic flux utilization, leading to reduced mechanical power and increased size, with magnetic saturations and interference issues, and poor reaction times, particularly in applications like motor vehicles and aeronautics.
Innovation Solution
The design features a ferromagnetic frame with two magnetic air gaps and a movable member with magnetized masses positioned to maintain constant magnetic flux intersection with windings, enhancing Laplace force intensity and allowing for smaller components while maintaining mechanical power, using aligned windings and a non-ferromagnetic carriage to minimize magnetic interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If windings of electromagnetic turns are increased in size and high control current is used, then mechanical power is increased, but device size becomes significant and reaction time deteriorates
Solution Approach 1:
The patent changes the configuration parameters of the magnetic circuit by introducing a ferromagnetic screen with specific magnetic permeability (μ ≥ 1.000.000) and positioning it at a controlled distance (e ≥ 0.5 mm) from the magnetized masses. This parameter optimization enables the system to achieve high mechanical power (800 W) with compact dimensions and fast reaction time (2 ms) without requiring oversized windings or excessive current
2Reliability
If ferromagnetic frame is oversized with excessive thicknesses, then magnetic saturation is reduced, but device size becomes prohibitive
Solution Approach 1:
The patent applies local quality by introducing a ferromagnetic screen with high magnetic permeability (μ ≥ 1.000.000) positioned at a specific location (distance e ≥ 0.5 mm) within the magnetic circuit. This localized ferromagnetic element optimizes magnetic flux distribution and prevents saturation in critical areas without requiring the entire frame to be oversized, thus maintaining compact dimensions while ensuring magnetic flux stability
3Force
If magnetized masses are positioned temporarily vis-à-vis portions of adjacent turns, then Laplace force is generated, but force is not maximum over entire displacement
Solution Approach 1:
The patent ensures continuity of useful action by positioning magnetized masses such that they are constantly vis-à-vis portions of adjacent turns throughout the entire displacement range of the mobile member. This continuous alignment maintains maximum Laplace force generation across the full stroke, eliminating dead zones and ensuring optimal productivity throughout the motion cycle
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 configuration increases mechanical power by tenfold for the same electrical power, reduces device size, and improves reaction time, enabling efficient actuation of components like gearbox or clutch selectors in motor vehicles.
Implementation Method 1
The introduction of a current into the windings of electromagnetic turns through which the magnetic fields induced by the magnetized masses pass, generate Laplace forces which, for the portions of turns perpendicular to the axis of movement of the mobile member, will be in its axis of movement, thus causing the movement of said member.
Implementation Method 2
said magnetic masses being arranged on said movable member so as to each create a magnetic field, which in said magnetic air gap is almost perpendicular to said direction of displacement
Data Source
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AI summary
The device has a mobile element (2) comprising magnetized masses (22) that are arranged to cross magnetic air-gaps, which are delimited by ferromagnetic cores (300B, 310B). Coils (30A, 30B, 31B) are juxtaposed adjacent to each other between adjacent zones of the air-gaps. Turn portions are located in planes that are perpendicular to a displacement direction. The magnetized masses are dimensioned so as to obtain a portion that is constantly positioned opposite to the turn portions located in the adjacent zones when the mobile element moves between two extreme positions.