Axial Gap Motor Core Layout With Void Sections for Higher Torque
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Solution Overview
Problem
The existing axial gap motor configurations, such as those described in JP-A-2012-23879, suffer from reduced torque due to longer magnetic paths and insufficient magnetic flux density, which limits the motor's efficiency and performance.
Innovation Solution
The axial gap motor design incorporates a stator with a core configuration featuring first and second magnetic sections that are symmetrically arranged with respect to the rotation axis, where the first magnetic section is in contact with one side of the bobbin and the second magnetic section is in contact with the opposite side, creating a void between them, thereby reducing the magnetic path length and increasing magnetic flux density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If laminated sections are separated to configure teeth with voids among them, then eddy current is reduced, but magnetic path length increases and torque decreases
Solution Approach 1:
The core is divided into multiple magnetic sections (first magnetic section, second magnetic section, etc.) that are arranged side-by-side in the circumferential direction. Each magnetic section corresponds to a tooth structure, and void portions are provided between adjacent magnetic sections. This segmentation reduces eddy current paths while the specific arrangement of magnetic sections optimizes the magnetic path length to maintain or increase motor torque.
2Force
If magnetic sections are arranged to reduce magnetic path length, then torque increases, but manufacturing complexity increases
Solution Approach 1:
The core is segmented into multiple independent magnetic sections that can be manufactured separately and then assembled. This segmentation allows for simplified manufacturing of each individual magnetic section while achieving the overall torque enhancement through their strategic arrangement with void portions between them.
Solution Approach 2:
Multiple magnetic sections are combined in the circumferential direction to form the complete core structure. The magnetic sections are positioned adjacent to each other with void portions between them, creating a unified core that achieves both torque enhancement and manufacturing simplicity through modular assembly.
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 facilitates easier manufacturing and significantly enhances the output torque of the motor while maintaining manufacturing simplicity and reducing eddy currents, leading to improved efficiency and stability.
Implementation Method 1
A magnetic path of a field magnet for rotating the rotor is increased in length. Since magnetic flux density is smaller as the magnetic path is longer
Implementation Method 2
Voids are provided among the laminated sections in order to provide high magnetic resistance portions to reduce an eddy current
Data Source
AI summary
An axial gap motor includes a rotor and a stator disposed to be separated with a gap from the rotor in a direction parallel to a rotation axis of the rotor. The stator includes a bobbin housing a coil and a core provided on an inside of the bobbin and configured by a plurality of magnetic sections. A first magnetic section among the plurality of magnetic sections is in contact with an inner peripheral wall of, among side portions of the bobbin, a first side portion opposed to a side portion of a bobbin on one side adjacent to the bobbin. A second magnetic section among the plurality of magnetic sections is in contact with an inner peripheral wall of, among the side portions of the bobbin, a second side portion opposed to a side portion of a bobbin on the other side adjacent to the bobbin. A void portion is present between the first magnetic section and the second magnetic section.