Rectangular Core Round Yoke Actuator Design
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Solution Overview
Problem
Existing single-coil electromagnetic actuators for medium-voltage switches have a rotationally symmetrical design that limits their adaptability to different short-circuit currents and requires a specific diameter for the air gap area, making them inflexible and not easily scalable.
Innovation Solution
A rectangular magnet core with a round, rotationally symmetrical yoke is used, allowing for varying the depth of the core and diameter of the yoke to create a compact, high-force actuator that can be easily matched to different short-circuit currents, with the yoke being able to rotate for adjustable stroke and the use of high-density permanent magnets for enhanced magnetic induction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a rotationally symmetrical design is used for the electromagnetic actuator, then the design is simple and easy to manufacture, but the adaptability to different short-circuit currents is limited and the air gap diameter cannot be easily varied
Solution Approach 1:
The patent applies asymmetry by combining a rectangular magnet core with a round yoke, breaking the rotational symmetry of traditional designs. This asymmetric configuration allows the air gap area to be adjusted by varying the depth of the rectangular core while maintaining a fixed width, enabling adaptation to different short-circuit current ratings without changing the overall design framework
2Adaptability or versatility
If the air gap area is changed to match different short-circuit currents, then the adaptability improves, but the diameter of the air gap must be changed requiring new parts
Solution Approach 1:
The patent transitions from adjusting the air gap area by changing the diameter (two-dimensional adjustment) to adjusting it by varying the depth of the rectangular magnet core (one-dimensional adjustment). This dimensional change allows the air gap area to be modified while keeping the width and yoke diameter constant, reducing the number of different parts needed for different current ratings
3Adaptability or versatility
If a rectangular magnet core with round yoke is used, then the adaptability to different air gap areas is improved, but the design complexity increases
Solution Approach 1:
The patent segments the magnet core into a rectangular shape with distinguishable width and depth dimensions, allowing independent adjustment of the depth to vary the air gap area. This segmentation enables modular adjustment where only the core depth needs to be changed rather than redesigning the entire actuator structure
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 results in a compact, lightweight actuator with adjustable force and stroke, capable of achieving high magnetic forces and efficient actuation with reduced size and weight, suitable for various applications by varying the air gap area and leveraging the magnetic flux concentration.
Implementation Method 1
a magnet core having a coil
Implementation Method 2
The connected position is then held, counter to the force of the contact pressure spring, with the aid of one or more permanent magnets
Implementation Method 3
the magnet core of the electromagnetic actuator is rectangular and the movable yoke is a round yoke which corresponds to the magnetic circuit of the magnet core
Data Source
AI summary
The disclosure relates to an electromagnetic actuator, such as for a medium-voltage switch, having a core having a coil applied to it, and a movable yoke. A method for producing such an actuator is also disclosed. A compact design can be achieved with, at the same time, a high level of actuator force, using a magnetic circuit of the actuator which has a rectangular magnet core and a round yoke which corresponds to the magnetic circuit of the magnetic core.