Conical Magnets for Electrodynamic Machines
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Solution Overview
Problem
Conventional axial motor and generator structures experience issues such as detent torque and hysteresis losses due to the use of isotropic materials and non-straight magnetic flux paths, which limit their efficiency and torque output.
Innovation Solution
The implementation of conical magnets and rotor-stator structures with field pole members that utilize anisotropic materials and straight or substantially straight flux paths to minimize reluctance and hysteresis losses, while optimizing magnetic flux density and torque generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional axial motor structures use isotropic materials and non-straight flux paths, then manufacturing is simpler, but hysteresis losses increase and efficiency decreases
Solution Approach 1:
The patent changes the magnetic material parameter from isotropic to anisotropic, which has different magnetic properties in different directions. This parameter change reduces hysteresis losses by aligning the magnetic grain orientation with the flux path, while the conical magnet geometry maintains manufacturability through standard machining processes
Solution Approach 2:
The patent employs conical (curved) magnet geometry instead of flat or cylindrical shapes. The conical surfaces create straighter flux paths through the anisotropic material, reducing hysteresis losses while the rotational symmetry of the cone maintains ease of manufacture using conventional machining methods
2Force
If conventional axial motor structures use non-straight magnetic flux paths, then device complexity is reduced, but torque output decreases due to increased reluctance
Solution Approach 1:
The conical magnet surfaces are angled to guide magnetic flux in straighter paths across the air gap and through the anisotropic material. This curved geometry optimization increases torque output by reducing magnetic reluctance without significantly increasing device complexity, as the conical shape integrates naturally with the rotor structure
Solution Approach 2:
The patent applies anisotropic material with specific grain orientation in key regions where flux paths are most critical. This local optimization of material properties reduces reluctance and increases torque output in the most important flux-carrying regions without requiring anisotropic material throughout the entire device
3Object-generated harmful factors
If conventional axial motor structures use traditional magnet geometries, then manufacturing precision requirements are lower, but detent torque increases
Solution Approach 1:
The conical magnet geometry with its continuous curved surfaces eliminates sharp edges and flat interfaces that cause magnetic flux to concentrate at specific points. This curvature distributes the flux more evenly, reducing detent torque while the conical shape can be manufactured with standard tolerances using conventional machining 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 approach reduces detent torque and hysteresis losses, enhancing the efficiency and torque output of electrodynamic machines by utilizing anisotropic materials and optimizing magnetic flux paths.
Implementation Method 1
conical magnets for rotors in electrodynamic machines... field pole members and conical magnets... magnetic region configured to confront one or more air gaps
Implementation Method 2
laminations 114 do not effectively use anisotropic materials to optimize the flux density and reduce hysteresis losses in flux-carrying poles
Implementation Method 3
utilize anisotropic materials and straight or substantially straight flux paths to minimize reluctance and hysteresis losses
Data Source
AI summary
Embodiments of the invention provide for conical magnets for rotors in electrodynamic machines, methods to design the same, and rotor-stator structures for electrodynamic machines. In various embodiments, a rotor-stator structure for electrodynamic machine can include field pole members and conical magnets. According to at least some embodiments, one or more of the conical magnets can include a magnetic region configured to confront one or more air gaps. The magnetic region can be substantially coextensive with one or more acute angles to the axis of rotation. The magnetic region can also include a surface positioned at multiple radial distances from the axis of rotation in a plane perpendicular to the axis of rotation.