Rotor Magnetizing Coil Layout to Prevent Flux Misalignment
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Solution Overview
Problem
High-rotation motors with smaller diameters and more poles face challenges in magnetizing permanent magnets due to reduced magnetic circuit size and increased magnetic field intensity requirements, leading to inefficient magnetization and potential misalignment of magnetic fields, which can result in increased manufacturing costs and reduced product lifetime.
Innovation Solution
A magnetizing device comprising multiple coils arranged to generate composite magnetic fields that concentrate magnetic flux within the rotor, with an auxiliary coil to manage leakage flux and prevent misalignment, allowing for efficient magnetization of internal magnetic bodies at lower costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the power supply capacity and electrical current are increased to ensure necessary magnetic field intensity, then the magnetic field intensity is improved, but the product lifetime of magnetizing coils is shortened and manufacturing costs increase
Solution Approach 1:
The magnetizing device divides the magnetizing function into multiple independent coils (first magnetizing coil, second magnetizing coil, third magnetizing coil, and auxiliary coil) arranged at different positions. Each coil generates a magnetic field in a specific direction, and together they create the required composite magnetic field intensity without requiring excessive current from a single coil, thereby extending product lifetime.
2Strength
If the power supply capacity and electrical current are increased to ensure necessary magnetic field intensity, then the magnetic field intensity is improved, but manufacturing costs increase
Solution Approach 1:
The magnetizing function is segmented into multiple coils with different functions (first, second, third magnetizing coils for primary magnetization, and auxiliary coil for leakage flux management). This segmentation allows for more efficient use of electrical energy and reduces the need for high-power supply equipment, thereby lowering manufacturing costs.
3Stability of the object's composition
If a scattering prevention sleeve is added to prevent rotor deformation and magnet scattering, then the rotor stability is improved, but the air gap is widened and magnetization is affected
Solution Approach 1:
The magnetizing device applies magnetic fields locally at different positions around the rotor using multiple coils. The first magnetizing coil applies a diametrical outwardly directed magnetic field, while the second and third coils apply diametrical inwardly directed magnetic fields. This localized multi-directional approach ensures effective magnetization even with the widened air gap caused by the scattering prevention sleeve.
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 enables effective magnetization of internal magnetic bodies with high-intensity magnetic fields, reducing the risk of misalignment and extending product lifetime while minimizing manufacturing costs.
Implementation Method 1
a first magnetizing coil arranged in facing relation to an outer circumferential surface of the rotor, and configured to cause a diametrical outwardly directed first magnetic field to be generated
Data Source
AI summary
In a magnetizing device and a magnetizing method, by an auxiliary coil applying an auxiliary magnetic field to a rotor, among a plurality of magnetic bodies, in the case it is assumed that an auxiliary magnetic field is not present therein, a diametrical inwardly directed magnetic flux caused by the auxiliary magnetic field is made to pass with respect to a magnetic body for which there is a possibility of the magnetic body being magnetized in a direction opposite to a direction in which the magnetic body should be magnetized due to the passage of a leakage magnetic flux.