Rotary Electric Machine Halbach Rotor Stator Flux Leakage
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Solution Overview
Problem
In rotary electric machines with a Halbach array, leakage of magnetic flux occurs due to insufficient magnetic flux reception by the stator, leading to heat generation and reduced electrical power output when used as an electric generator.
Innovation Solution
The arrangement of permanent magnets with specific magnetic field orientations and surface area ratios forms a Halbach array, enhancing magnetic flux direction and reception by the stator, reducing leakage flux and heat generation, and improving torque and electrical power output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a Halbach array is adopted to arrange permanent magnets, then magnetic flux density increases and efficiency improves, but leakage flux occurs causing heat generation and reduced electrical power output
Solution Approach 1:
The patent applies local quality by making the stator teeth have different widths at different locations - wider at the ends and narrower in the middle. This non-uniform tooth width distribution creates regions with different magnetic flux reception capabilities, allowing the stator to better accommodate the high magnetic flux density from the Halbach array while preventing flux leakage that causes heat generation.
Solution Approach 2:
The patent changes the geometric parameters of the stator teeth, specifically the width dimension, to optimize magnetic flux reception. By adjusting the tooth width parameter along the circumferential direction, the stator can effectively receive the increased magnetic flux from the Halbach array configuration without experiencing harmful leakage effects.
2Power
If a Halbach array is adopted to arrange permanent magnets, then magnetic flux density increases, but heat generation increases due to leakage flux
Solution Approach 1:
The patent applies local quality by making the stator teeth have different widths at different locations - wider at the ends and narrower in the middle. This non-uniform tooth width distribution creates regions with different magnetic flux reception capabilities, allowing the stator to better accommodate the high magnetic flux density from the Halbach array while preventing flux leakage that causes heat generation.
3Force
If a Halbach array is adopted to arrange permanent magnets, then torque increases, but electrical power output decreases due to leakage flux
Solution Approach 1:
The patent applies local quality by making the stator teeth have different widths at different locations - wider at the ends and narrower in the middle. This non-uniform tooth width distribution creates regions with different magnetic flux reception capabilities, allowing the stator to better accommodate the high magnetic flux density from the Halbach array while preventing flux leakage that causes heat generation.
4Ease of manufacture
If stator teeth have uniform width, then manufacturing is simple, but magnetic flux reception is insufficient
Solution Approach 1:
The patent applies local quality by making the stator teeth have different widths at different locations - wider at the ends and narrower in the middle. This non-uniform tooth width distribution creates regions with different magnetic flux reception capabilities, allowing the stator to better accommodate the high magnetic flux density from the Halbach array while preventing flux leakage that causes heat generation.
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 configuration increases torque, reduces magnetic flux leakage and heat generation, and enhances electrical power output by optimizing the arrangement of permanent magnets and stator design.
Implementation Method 1
permanent magnets provided in an array in which main magnets the magnetic fields of which are directed outward or inward in radial directions of the stator, and sub-magnets the magnetic fields of which are directed in a clockwise or counterclockwise manner in circumferential directions of the stator
Implementation Method 2
arrange the permanent magnets that are provided on the rotor in a Halbach array
Implementation Method 3
accompanying energization or supply of current to the electromagnetic coil, the electromagnetic coil is brought into a magnetic state, and an alternating magnetic field is formed
Implementation Method 4
In the case of an electric generator, by applying a rotational biasing force to the rotor, an induced current is generated in the electromagnetic coil
Data Source
AI summary
A first magnet, a second magnet, a fourth magnet, and a third magnet are retained on a rotor of a rotary electric machine in this order alongside one another in a circumferential direction. Magnetic fields of the first magnet and the fourth magnet are oriented in radial directions of a stator. Magnetic fields of the second magnet and the third magnet are oriented in circumferential directions of the stator. When the rotor is viewed in plan from above or below, a ratio of a total surface area of the first magnet and the fourth magnet to a total surface area of the second magnet and the third magnet is S14:S23=1:0.2 to 1:1.