Actuator with Split Magnets for Linear Force Control
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Solution Overview
Problem
Existing actuator designs for engine mounts lack improvements in manufacturing and assembly efficiency, and they cannot operate with a stroke-independent linear magnetic force/current characteristic.
Innovation Solution
An electromagnetic and dynamic actuator featuring a conductive cylinder coil, two ferromagnetic magnetic cores, and a permanently magnetized system with a non-magnetic separating element and split permanent magnets, allowing for a symmetrical arrangement that compensates forces and provides a deflection-independent current-proportional force characteristic.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional actuator design with a single continuous permanent magnet and solid magnetic core is used, then the magnetic force is strong, but the manufacturing complexity and assembly difficulty increase
Solution Approach 1:
The permanent magnet is divided into multiple segments along the longitudinal axis, creating distinct magnetic regions that can be independently positioned. The magnetic core is segmented with non-magnetic separating elements between segments, allowing for modular assembly and simplified manufacturing while maintaining magnetic functionality.
Solution Approach 2:
Non-magnetic separating elements are extracted and placed between magnetic core segments to create controlled magnetic circuit paths. This extraction of non-magnetic material allows for simplified assembly and manufacturing by enabling modular construction of the magnetic assembly.
2Manufacturing precision
If the permanent magnet and magnetic core are arranged in a conventional asymmetric configuration, then the magnetic force is generated, but the force characteristic depends on stroke position
Solution Approach 1:
The patent employs asymmetric positioning of the non-magnetic separating elements relative to the magnetic core segments, creating a specific magnetic circuit configuration that compensates for stroke-dependent force variations and achieves a linear force-current characteristic independent of stroke position.
Solution Approach 2:
The magnetic circuit is pre-configured with specific separating element positions and magnetic core geometries that anticipate and counteract stroke-dependent force variations, ensuring linear force characteristics are maintained across the entire stroke range without requiring active compensation.
3Device complexity
If the first magnetic core is solid without interruptions, then the magnetic flux path is continuous, but the assembly complexity increases
Solution Approach 1:
Non-magnetic separating elements serve as intermediaries between magnetic core segments, providing controlled magnetic circuit paths while enabling modular assembly. These separating elements maintain magnetic flux continuity through the assembly while simplifying manufacturing and assembly procedures.
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 actuator achieves a simplified assembly, a more compact and robust design, and a stroke-independent current-proportional force characteristic, enabling precise control of bearing stiffness and frequency-selective adjustment of vibration phase.
Implementation Method 1
an electrically conductive cylinder coil (2), a first magnetic core (3) made from ferromagnetic material, a second magnetic core (4) made from ferromagnetic material and at least one permanent magnet (5)
Implementation Method 2
Together, the permanent magnet and coil form an oscillating spring-mass system
Implementation Method 3
a first magnetic core (3) made from ferromagnetic material, a second magnetic core (4) made from ferromagnetic material
Data Source
Figure 1
Figure 2a~2c
Figure 3a~3c
AI summary
The invention relates to an actuator (1) for motor bearings, comprising - an electrically conductive cylinder coil (2), - a first magnet core (3) made of a ferromagnetic material, - a second magnet core (4) made of a ferromagnetic material, and - at least one permanent magnet (5), the magnetizing direction of which is oriented perpendicularly to the longitudinal axis (12) of the cylinder coil (2). The first and second magnet core (3, 4) are arranged in a movable manner relative to each other in the direction of the longitudinal axis (12) of the cylinder coil (2). The invention is characterized in that the first magnet core (3) substantially surrounds the cylinder coil (2) and is interrupted by a non-magnetic separating element (10) at a cylinder coil (2) lateral face facing the permanent magnet (5), and the permanent magnet (5) is designed so as to be interrupted at least once in the direction of the longitudinal axis (12) of the cylinder coil (2) and has at least two parts (5a, 5b).