Linear Electromagnetic Actuator With Reversible Magnetic Latching
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Solution Overview
Problem
Existing electromagnetic actuation assemblies are bulky and inefficient, requiring a more compact and efficient design for applications in powertrain assemblies of electric vehicles.
Innovation Solution
A linear actuation assembly with a simplified design featuring a bobbin-wrapped electromagnetic coil, sets of magnets, and a translator that moves between positions based on magnetic flux direction, allowing for reversible and controllable axial movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If traditional electromagnetic actuation assemblies are used, then reliable actuation function is achieved, but the assembly becomes bulky and inefficient
Solution Approach 1:
The patent merges the stator and rotor magnetic circuits into a single integrated structure where the electromagnetic coil is wound directly on the stator housing that also serves as the rotor assembly. This consolidation eliminates separate magnetic circuit components and reduces overall assembly volume while maintaining actuation efficiency.
Solution Approach 2:
The stator housing performs multiple functions simultaneously: it serves as the electromagnetic coil support structure, the magnetic circuit core, and the rotor assembly housing. This multi-functionality reduces the number of separate components needed, thereby reducing assembly size and improving efficiency.
2Volume of moving object
If simplified design is implemented, then compactness is achieved, but manufacturing complexity may increase
Solution Approach 1:
The electromagnetic assembly is segmented into distinct functional modules: the electromagnetic coil wound on the stator housing, the permanent magnet rotor assembly, and the translator mechanism. This segmentation allows each module to be manufactured and assembled separately, reducing overall manufacturing complexity despite the simplified integrated design.
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 assembly achieves efficient, reversible axial movement with reduced size and weight, suitable for applications in powertrain assemblies, including clutch control in vehicular transmissions.
Implementation Method 1
An electric current is sent through a conductive coil of wire to create a magnetic field. This magnetic field acts on a translator to move it in one direction or two directions
Implementation Method 2
A first set of magnets is disposed in end-to-end relation adjacent the first side of the electromagnetic coil at the inner diameter thereof. A second set of magnets is disposed in end-to-end relation adjacent the second side of the electromagnetic coil about the inner diameter thereof
Data Source
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AI summary
A linear actuation assembly includes an electromagnetic coil configured to allow electric current to pass therethrough in either direction creating magnetic flux based on the electric current and its direction. A first set of magnets is disposed in end-to-end relation adjacent a first side of the electromagnetic coil at the inner diameter thereof. A second set of magnets is disposed in end-to-end relation adjacent a second side of the electromagnetic coil about the inner diameter thereof. The linear actuation assembly further includes at least one translator disposed adjacent the first and second sets of magnets opposite the electromagnetic coil. The at least one translator is latchable between a first position adjacent the first set of magnets and a second position adjacent the second set of magnets in response to the magnetic flux and the direction in which the electric current is flowing.