Halbach Rotor Magnet Arrangement for Torque and Leakage
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Solution Overview
Problem
Current permanent-magnet motors face challenges in enhancing torque, reducing magnetic leakage, and minimizing core loss, with insufficient research on the Halback magnetic ring array configuration.
Innovation Solution
A rotor apparatus for a permanent-magnet motor utilizing a Halback magnetic ring array with a specific ratio of distance between parallel magnets and outer ring edge to diameter difference, and magnetic intensity configuration, optimizing the arrangement of first and second magnets in a crisscross pattern within the rotor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If traditional magnet arrangement method is used, then the motor structure is simple, but the cogging torque and torque ripple effects are significant causing vibration and noise
Solution Approach 1:
The rotor is divided into multiple magnetic rings with different magnet arrangements. Each magnetic ring contains magnets arranged in specific patterns (radial, parallel, or alternating polarity) to segment the magnetic field distribution, thereby reducing cogging torque and torque ripple while maintaining structural feasibility
Solution Approach 2:
The patent employs asymmetric magnet arrangements within the magnetic rings, including radial arrays, parallel arrays, and alternating polarity arrays. These asymmetric configurations disrupt the uniform magnetic field distribution that causes cogging torque, effectively reducing vibration and noise while maintaining motor performance
2Object-generated harmful factors
If Halback magnetic ring array is used, then the magnetic leakage is reduced, but the research and optimization are insufficient
Solution Approach 1:
The patent systematically varies key parameters of the Halback magnetic ring array including the number of magnetic rings, the number of magnets per ring, magnet dimensions, and spacing between rings. By optimizing these parameters, the invention achieves reduced magnetic leakage while improving torque and reducing core loss, advancing the state of research on Halback arrays
3Ease of manufacture
If the ratio of distance to diameter difference is not optimized, then the manufacturing is easier, but the motor torque is insufficient and core loss is high
Solution Approach 1:
The patent identifies and optimizes the critical parameter of distance-to-diameter-ratio (a/β) within the range of 0.43-0.48. This parameter optimization significantly improves motor torque and reduces core loss while maintaining reasonable manufacturing complexity, demonstrating that precise parameter control can achieve high performance without excessive manufacturing difficulty
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 significantly increases motor torque, reduces magnetic leakage, and minimizes core loss, demonstrating superior performance and efficiency compared to prior art, as shown in torque, core loss, and magnetic leakage comparison charts.
Implementation Method 1
the introduction of Halback magnetic ring array by Klaus Halback in the twentieth century, its special magnet arrangement method, in comparison to the traditional magnet arrangement method, is able to significantly reduce the generation of the cogging torque and torque ripple effects of the motor
Implementation Method 2
the magnetic self-shielding characteristic equipped by such magnetic ring array is able to also reduce the magnetic leakage of the motor
Data Source
AI summary
A rotor apparatus for a permanent-magnet motor has the main technical feature of a ring rotor with its magnets arranged according to the Halback magnetic ring array. In addition, for a distance between magnets of a parallel array and the outer ring edge of the rotor, and for a diameter difference between the inner and outer diameters of the ring rotor, a ratio between said distance/said diameter difference is between 0.43 and 0.48.