Arc Magnet Flux Concentrate Rotor Bridge Layout for Rigidity
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Solution Overview
Problem
Existing flux concentrate type rotors with arc type permanent magnets face issues of structural instability, deformation, and reduced mechanical rigidity due to concentrated forces on fixing protrusions, limiting torque and output enhancement.
Innovation Solution
A flux concentrate type rotor design with a rotor core that includes bridges connecting outer and inner diameter portion cores at an optimal position based on the shape of the arc type permanent magnet, minimizing deformation and enhancing structural stability while maximizing back electromotive force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a square bar type permanent magnet is used in an open slot structure, then the rotor can be miniaturized for high torque and output, but the mechanical strength becomes weak because the scattering force is concentrated on the fixing protrusions
Solution Approach 1:
The rotor core is segmented into outer diameter portion cores and an inner diameter portion core, with bridges connecting them. This segmentation distributes the scattering force of the permanent magnet across multiple structural elements rather than concentrating it on fixing protrusions, thereby maintaining mechanical strength while enabling high torque output through the flux concentrate structure.
Solution Approach 2:
The bridge structure is strategically positioned at an optimal location between the outer diameter portion cores and the inner diameter portion core. This local structural enhancement provides targeted support to withstand the scattering force of the permanent magnet, while the rest of the rotor maintains the flux concentrate geometry for high torque generation.
2Power
If the pole arc of the permanent magnet is increased to improve flux concentration, then torque and output are enhanced, but the structural rigidity and deformation resistance of the rotor core are reduced
Solution Approach 1:
The bridge is positioned at a specific optimal location that provides localized structural reinforcement. This allows the permanent magnet to have an increased pole arc for improved flux concentration and torque, while the bridge at the critical position maintains structural rigidity and resists deformation under the increased magnetic forces.
Solution Approach 2:
The bridge structure is pre-positioned at the optimal location before the permanent magnet operates at high pole arc settings. This preliminary structural preparation ensures that when the magnet generates high torque through increased pole arc, the bridge is already in place to prevent excessive deformation and maintain structural integrity.
3Stability of the object's composition
If bridges are positioned to support the permanent magnet, then structural stability is improved, but the magnetic resistance increases and leakage flux increases
Solution Approach 1:
The bridge is positioned at an optimally selected location that balances structural support needs with magnetic flux efficiency. This specific positioning provides necessary structural stability to support the permanent magnet while minimizing interference with the magnetic flux path, thereby reducing leakage flux and maintaining high magnetic resistance.
Solution Approach 2:
Rather than providing extensive bridging structures throughout the rotor, a single bridge is positioned at the critical optimal location. This partial action provides sufficient structural stability where most needed while minimizing the overall impact on magnetic flux paths and reducing leakage flux to the minimum necessary extent.
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 design improves structural stability, reduces noise and vibration, and increases mechanical rigidity, thereby maximizing the performance and torque output of the rotor.
Implementation Method 1
The rotor is configured to interact electromagnetically with the stator, and is rotated by a force acting between a magnetic field and a current flowing through a coil
Implementation Method 2
The motor using a permanent magnet to generate a magnetic field
Data Source
AI summary
A flux concentrate type rotor includes a rotor core including an inner diameter portion core, a plurality of outer diameter portion cores, and a plurality of bridges connecting the plurality of outer diameter portion cores to the inner diameter portion core, and a plurality of arc type permanent magnets each inserted between two adjacent outer diameter portion cores. Each of the plurality of bridges includes a first straight portion extending in a radial direction of the rotor core, and a first angle θ1 between a first extension line connecting a center of the arc type permanent magnet and a center of the inner diameter portion core and a second extension line connecting a center of the first straight portion of the bridge and the center of the inner diameter portion core satisfies: θ1=5.75°±4°.