Magnet Assembly Alignment for Axial Flux Motors
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Solution Overview
Problem
Axial flux motors and generators face performance issues due to self-aligning rotor assemblies, which lead to deviations in magnetic field alignment under torque conditions, reducing electromagnetic torque and voltage output, and causing nonlinear behavior and mechanical degradation.
Innovation Solution
A magnet handling apparatus with a base, bearing assembly, and support structure positioning mechanism that allows magnets to rotate to a preferred angular orientation, ensuring proper pole alignment and torque transmission, using alignment features and mechanisms to secure rotor assemblies to a rotor shaft.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If self-aligning rotor assemblies are used to simplify assembly, then assembly ease is improved, but magnetic field alignment deviates under torque conditions reducing electromagnetic torque and voltage output
Solution Approach 1:
The patent applies preliminary action by pre-aligning the magnet assembly to the rotor shaft using alignment features (alignment pins, alignment slots, or alignment keys) before the magnet is subjected to torque conditions. This ensures that the magnetic poles are correctly positioned relative to the stator windings before operation begins, preventing alignment deviation during operation.
Solution Approach 2:
The patent introduces an intermediary alignment mechanism between the magnet assembly and rotor shaft. The alignment features act as intermediaries that transfer and maintain the correct angular relationship, ensuring that the magnetic field alignment is preserved under torque conditions while still allowing for ease of assembly.
2Ease of manufacture
If conventional magnet assembly methods are used, then manufacturing simplicity is maintained, but manufacturing precision of angular orientation is insufficient
Solution Approach 1:
The patent employs asymmetry in the form of alignment features such as alignment pins fitting into alignment slots, or alignment keys in keyways. These asymmetric features provide a unique angular orientation that cannot be rotated to alternative positions, ensuring precise angular alignment of the magnet assembly to the rotor shaft while maintaining simplicity in the manufacturing process.
Solution Approach 2:
The patent replaces complex mechanical alignment systems with simpler alignment features integrated into the rotor shaft and magnet assembly. Instead of using complex adjustable mechanisms, the invention uses fixed alignment features (pins, slots, keys) that provide precise angular orientation through their geometric relationship, simplifying the manufacturing process while improving precision.
3Device complexity
If rotor assemblies are allowed to self-align, then assembly complexity is reduced, but torque transmission efficiency decreases due to alignment deviations
Solution Approach 1:
The patent applies preliminary action by pre-establishing the correct angular relationship between the magnet assembly and rotor shaft through alignment features before the assembly is subjected to operational torque. This preliminary alignment ensures that the magnetic poles are correctly positioned to maximize electromagnetic torque generation, preventing power loss due to misalignment during operation.
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 solution maintains high magnetic field alignment, enables efficient torque transmission, and optimizes the thickness profile of support structures for reduced weight and improved control, enhancing motor/generator performance and reducing mechanical degradation.
Implementation Method 1
the magnet is held firmly by magnetic force
Implementation Method 2
at least one magnet alignment feature that causes the magnet to rotate about the axis to a preferred angular orientation corresponding to a lower energy configuration
Implementation Method 3
The bearing assembly is moved relative to the base to bring the magnet closer to the base and allow the magnet to achieve the preferred angular orientation
Data Source
AI summary
An apparatus for forming a magnet assembly may comprise a base, a bearing assembly, and a support structure positioning mechanism. The bearing assembly may be configured to support a magnet and to allow the magnet to rotate about an axis normal to a surface of the base. The support structure positioning mechanism may be configured to position a support structure on the magnet when the magnet is on the base. The base may comprise at least one magnet alignment feature that causes the magnet to rotate about the axis to a preferred angular orientation corresponding to a lower energy configuration as a function of angle about the axis as the magnet moves closer to the base. The bearing assembly may be movable along the axis to allow the magnet to be moved closer to the base and cause the magnet to achieve the preferred angular orientation.