Halbach Array Stator Assembly to Prevent Magnet Detachment
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Solution Overview
Problem
The detachment of magnets from the stator core due to different magnetization directions of circumferentially adjacent magnets is a concern, particularly for radially magnetized magnets, which experience a relatively large radially inward force.
Innovation Solution
A stator design incorporating a Halbach array with magnets arranged in a specific configuration, including radial and circumferential magnets with inclined end surfaces and projections, and optionally using intermediate members to enhance magnetic flux distribution and prevent detachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a Halbach array with radially magnetized magnets is used to concentrate magnetic flux radially inward, then magnetic flux concentration is improved, but the risk of magnet detachment increases due to large radially inward forces
Solution Approach 1:
The patent converts the harmful radially inward force that causes magnet detachment into a beneficial locking mechanism. By designing inclined end surfaces on adjacent magnets, the radially inward force generates a circumferential component that presses the magnets against each other's inclined surfaces, creating a self-locking effect that prevents detachment while maintaining the Halbach array's magnetic flux concentration capability
Solution Approach 2:
The inclined end surfaces act as intermediary contact surfaces between adjacent magnets. These surfaces mediate the force transmission between magnets, converting the radially inward magnetic force into a beneficial inter-magnet contact force that prevents detachment rather than allowing direct detachment from the stator core
2Power
If magnets with different magnetization directions are arranged circumferentially in a Halbach array, then magnetic flux distribution is improved, but the structural stability of magnets on stator teeth deteriorates
Solution Approach 1:
The patent transforms the force imbalance caused by different magnetization directions into a stabilizing mechanism. The inclined end surfaces convert the net radial force into a circumferential pressing force between adjacent magnets, creating mutual support that enhances structural stability while preserving the required magnetic flux distribution pattern
Solution Approach 2:
The inclined end surfaces introduce asymmetry in the mechanical contact geometry between magnets. This asymmetric inclination is specifically designed to convert radial forces into circumferential locking forces, providing directional stability that counteracts the destabilizing effect of different magnetization directions
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 design effectively suppresses the detachment of magnets by generating radially outward forces, stabilizing the magnets on the stator teeth, and facilitates easier assembly by reducing the movement required during assembly.
Implementation Method 1
there is concern that the magnets may come off from teeth of the stator core due to the different magnetization directions of circumferentially adjacent magnets
Implementation Method 2
The present inventors have devised the application of a Halbach array which concentrates the magnetic flux radially inward of the stator
Implementation Method 3
a radially outward force acts on the first radial magnet, preventing the first radial magnet from coming off from the plurality of teeth
Data Source
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AI summary
A group of magnets in a Halbach array constituting a stator includes: a first radial magnet magnetized radially outward; a first circumferential magnet disposed on one side of the first radial magnet in the circumferential direction and magnetized to the one side; and a second circumferential magnet disposed on the other side of the first radial magnet in the circumferential direction and magnetized to the other side. At least one of one end surface or the other end surface of the first radial magnet in the circumferential direction has a first inclined end surface that slopes toward the center of the first radial magnet in the circumferential direction as it extends radially inward. At least one of the other end surface of the first circumferential magnet in the circumferential direction or one end surface of the second circumferential magnet in the circumferential direction has a first contact inclined end surface that is in contact with the first inclined end surface and slopes toward the center of the first radial magnet in the circumferential direction as it extends radially inward.