Axial Gap Motor Rotor Structure for Low-Weight Vibration Damping
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Solution Overview
Problem
Axial gap motors face challenges in improving responsiveness during acceleration and deceleration while maintaining rigidity, as thinning the coupling section to reduce weight leads to increased vibration and noise due to the bending of reinforcement plates under rotational and magnetic forces.
Innovation Solution
The axial gap motor incorporates a rotor with a coupling section featuring voids and reinforcing members with a lower density filler, such as silicone rubber, to enhance rigidity and reduce deformation, noise, and vibration by covering the voids and integrating the reinforcing members with adhesives, while maintaining a lightweight design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the coupling section is thinned down to reduce weight, then responsiveness during acceleration and deceleration is improved, but the rigidity of the coupling section decreases
Solution Approach 1:
The coupling section uses a composite structure combining a thin-walled base material with foam filling material (such as urethane foam) inside the recesses. This composite approach allows the coupling section to maintain low weight while the foam material provides internal support to prevent deformation, thereby preserving rigidity without requiring thick walls or heavy reinforcement plates.
Solution Approach 2:
Instead of uniformly thickening the entire coupling section, the invention locally adds foam filling material only in the recesses where structural support is needed. This localized approach provides rigidity enhancement precisely where required while maintaining the overall lightweight design of the thin-walled coupling section.
2Strength
If a plate member is provided for reinforcement in the coupling section, then the rigidity of the coupling section is increased, but the plate member bends and vibrates under rotational and magnetic forces, causing noise
Solution Approach 1:
The invention uses foam filling material that expands to fill the recesses in the coupling section. This foam material acts as a cushioning element that absorbs vibrational energy and dampens bending motions, thereby reducing the vibration and noise generated by the coupling section during motor operation while maintaining structural rigidity.
Solution Approach 2:
The foam filling material is incorporated into the coupling section structure before the motor operates, providing preemptive cushioning and vibration damping. This prevents the coupling section from bending and vibrating under operational forces, thereby eliminating noise and vibration issues before they occur during motor rotation.
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 effectively suppresses deformation, vibration, and noise in the rotor, achieving a balance between reduced weight and maintained mechanical strength, thereby improving the motor's responsiveness and efficiency.
Implementation Method 1
a member disposed in the recess and having density lower than density of the coupling section
Implementation Method 2
silicone rubber
Data Source
AI summary
An axial gap motor includes a rotor configured to rotate around a rotation axis and a stator disposed to be opposed to the rotor across a gap in an axial direction parallel to the rotation axis. The rotor includes a hub, an annular rim located on the outer side of the hub and holding a permanent magnet, a coupling section coupling the hub and the rim and including a recess having a first opening opened on a surface facing one end side in the axial direction, a first plate member disposed on the one end side of the coupling section and covering at least a part of the first opening in plan view from the axial direction, and a member disposed in the recess and having density lower than the density of the coupling section.