Auxiliary Coil Magnetizing Layout for Small Multi-Pole Rotors
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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 flux and increased magnetic field intensity requirements, leading to difficulties with conventional magnetizing devices that 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 enhance magnetic flux penetration, with auxiliary coils managing leakage flux to prevent opposite magnetization of adjacent magnetic bodies, allowing for effective magnetization of internal magnetic bodies with reduced costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the diameter of the rotor is reduced and the number of poles is increased to achieve high-rotation motor design, then the motor size is reduced and output is increased, but the magnetic circuit for magnetizing permanent magnets becomes smaller and magnetic flux hardly reaches the inside of the permanent magnets
Solution Approach 1:
The magnetizing coils are divided into multiple segments (first magnetizing coils, second magnetizing coils, third magnetizing coils, and auxiliary magnetizing coils) positioned at different angular locations around the rotor. Each segment targets specific magnetic bodies to ensure comprehensive magnetization coverage despite the reduced rotor diameter and increased pole count.
Solution Approach 2:
Auxiliary magnetizing coils are introduced as intermediary elements to manage leakage magnetic flux. These coils generate auxiliary magnetic fields that guide and control the magnetic flux paths, ensuring that magnetic flux effectively reaches the interior of permanent magnets while preventing unwanted magnetization of adjacent magnetic bodies.
2Power
If the power supply capacity and electrical current flowing through magnetizing coils are increased to ensure necessary magnetic field intensity, then the magnetic field intensity is sufficient, but the product lifetime of magnetizing coils is shortened and manufacturing costs increase
Solution Approach 1:
The magnetizing system is segmented into multiple coils that can be activated independently or in combination. This allows the magnetic field to be distributed across multiple coils rather than requiring excessive current through a single coil, reducing thermal stress and extending coil lifetime while maintaining sufficient magnetic field intensity for effective magnetization.
Solution Approach 2:
The system changes operational parameters by using multiple coils with optimized winding configurations and activation sequences. This allows achieving the required magnetic field intensity through coordinated operation of multiple coils at moderate current levels rather than overloading a single coil, thereby improving reliability and reducing manufacturing costs.
3Manufacturing precision
If multiple magnetizing coils are arranged to generate composite magnetic fields, then magnetic flux penetration is enhanced, but the device complexity increases
Solution Approach 1:
The magnetizing coils are arranged asymmetrically around the rotor with different angular positions and orientations. The first, second, and third magnetizing coils are positioned at specific angles, and auxiliary coils are strategically placed to target specific magnetic bodies. This asymmetric arrangement optimizes magnetic flux distribution and enables effective magnetization of all magnetic bodies while managing device complexity through purposeful asymmetry rather than uniform symmetry.
Solution Approach 2:
The magnetizing coils serve multiple functions: primary magnetizing coils generate main magnetic fields for magnetization, while auxiliary coils simultaneously manage leakage flux and prevent opposite magnetization of adjacent magnetic bodies. This multi-functionality reduces the need for separate dedicated components, thereby controlling device complexity while achieving enhanced magnetization quality.
4Reliability
If auxiliary coils are used to manage leakage flux and prevent opposite magnetization, then adjacent magnetic bodies are protected from incorrect magnetization, but the device complexity increases
Solution Approach 1:
Auxiliary magnetizing coils act as intermediary elements that specifically target and manage leakage magnetic flux between adjacent magnetic bodies. These coils generate controlled auxiliary magnetic fields that guide flux paths and prevent unwanted magnetic coupling between adjacent magnetic bodies, ensuring accurate magnetization while adding only the necessary complexity to achieve this protective function.
Solution Approach 2:
The auxiliary magnetizing coils are positioned and configured to provide localized magnetic field control at specific locations where leakage flux problems occur. Rather than uniformly increasing complexity across the entire system, the auxiliary coils are strategically placed to address local magnetization issues, thereby improving magnetization accuracy with minimal additional complexity.
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 high-intensity magnetic field penetration within the rotor, effectively magnetizing internal magnetic bodies while preventing opposite magnetization of adjacent bodies, thus improving magnetization efficiency and reducing 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, with respect to a fourth magnetic body, a first auxiliary coil allows passage of a diametrical inwardly directed first auxiliary magnetic flux caused by a first auxiliary magnetic field. With respect to a fifth magnetic body, a second auxiliary coil allows passage of a diametrical inwardly directed second auxiliary magnetic flux caused by a second auxiliary magnetic field.