Field Magneton Magnetization Layout for Lower Cogging Torque
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Solution Overview
Problem
In existing rotating electric machines, the electromagnetic force is not evenly distributed in the axial direction of the field magneton due to the lack of consideration for magnetization ratios in the axial direction, leading to uneven magnetic flux densities and increased cogging torque.
Innovation Solution
A rotating electric machine design where the field magneton has a magnetic flux density at its center that is lower than at its ends in the axial direction, achieved by skewing the magnetization of the magnet bodies and using a specific magnetization process to ensure equalized electromagnetic force across the axial direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the magnetization ratio is set to be constant in the circumferential direction, then the magnetic pole centers are properly positioned, but the magnetic flux density becomes uneven in the axial direction
Solution Approach 1:
The patent applies local quality by setting different magnetization ratios for different axial positions. Specifically, the magnetization ratio at the center in the axial direction is set to 0.8-1.2 times the magnetization ratio at the ends, creating a non-uniform magnetization distribution that compensates for the natural tendency of magnetic flux to concentrate at the ends, thereby equalizing the magnetic flux density throughout the axial direction.
2Ease of manufacture
If conventional magnetization methods are used, then the manufacturing process is simple, but the electromagnetic force is not equalized in the axial direction
Solution Approach 1:
The patent changes the magnetization parameter (magnetization ratio) as a function of axial position. By setting the magnetization ratio at the center to be 0.8-1.2 times that at the ends, the patent creates a controlled parameter variation that equalizes electromagnetic force distribution in the axial direction while maintaining compatibility with conventional magnetization processes.
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 design effectively equalizes the magnetic flux densities and electromagnetic force in the axial direction, reducing cogging torque and improving the overall performance of the rotating electric machine by canceling out torque ripples and enhancing heat dissipation properties.
Implementation Method 1
components in a radial direction of the field magneton of magnetic fluxes passing from the field magneton to the armature
Implementation Method 2
electromagnetic force can be equalized in the axial direction of the field magneton
Data Source
AI summary
Provided is a rotating electric machine, including: a field magneton; and an armature. In terms of components in a radial direction of the field magneton of magnetic fluxes passing from the field magneton to the armature, a magnetic flux density at a center in an axial direction of the field magneton is lower than a magnetic flux density at an end in the axial direction of the field magneton.