Triangular Flux Bridge for Pivot Motors
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Solution Overview
Problem
Conventional pivot motors in hair clippers face inefficiencies due to V-shaped flux bridges that concentrate magnetic flux, leading to saturation and reduced power transfer from the stator to the armature.
Innovation Solution
A triangular flux bridge is introduced, providing a straight path for magnetic flux between the magnets, reducing saturation and enhancing power transfer and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a V-shaped flux bridge is used to guide magnetic flux, then the flux path is shortened and flux concentration is increased, but this leads to material saturation at the center and reduced power transfer efficiency
Solution Approach 1:
The invention changes the geometric parameters of the flux bridge from a V-shape to a triangular shape with a straight centerline. This parameter change modifies the flux distribution characteristics, preventing concentration at the center while maintaining an efficient flux path. The straight centerline configuration alters how magnetic flux travels through the bridge, distributing it more evenly across the material cross-section.
2Shape
If a V-shaped flux bridge is used, then the structure is compact, but the bent shape concentrates flux at the center causing material saturation
Solution Approach 1:
The triangular flux bridge introduces asymmetry in the flux path geometry compared to the symmetric V-shape. The straight centerline creates an asymmetric flux distribution pattern that avoids the concentration point at the center. This asymmetric configuration ensures more uniform flux distribution across the bridge material while maintaining structural compactness.
3Length of stationary object
If the flux bridge is bent in towards the center (V-shape), then the flux path length is reduced, but power and efficiency are compromised due to saturation
Solution Approach 1:
The invention optimizes the flux path length parameter by adopting a triangular shape with straight centerline. This configuration achieves an optimal balance where the flux path remains sufficiently short for efficiency, yet the straight geometry prevents the flux concentration that would cause saturation and power loss. The parameter optimization resolves the contradiction between path length and power output.
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 triangular flux bridge increases stroke length, reduces power consumption, and results in more efficient and powerful pivot motors with improved power transfer.
Implementation Method 1
Magnetic flux generated by passing alternating electrical current through an electrical coil in the stator flows through the permanent magnets and triangular flux bridge to generate electromechanical force
Implementation Method 2
The triangular flux bridge facilitates the flux flow, increasing motor power and motor efficiency. The triangular flux bridge provides a straight path for magnetic flux between the magnets, reducing saturation
Data Source
Figure 1~2
Figure 3
Figure 4A~4B
AI summary
A pivot motor 28 has a stator 30 and an armature 33. The armature 33 has an assembly of two spaced permanent magnets 66, 68 and a triangular flux bridge 70 on one end. Magnetic flux is generated by passing alternating current through an electrical coil 62 in the stator 30. The flux flows through the permanent magnets 66, 68 to generate electromotive force that vibrates the armature 33. The triangular flux bridge 70 adjacent the magnets 66, 68 facilitates the flux flow, increasing motor power under typical load conditions and motor efficiency.