Adjustable Rotor Demagnetization for Variable Magnet Designs
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Solution Overview
Problem
Existing demagnetization systems for recycling rare earth permanent magnets in electric machines are inefficient and complex due to their fixed radial position, making them unsuitable for rotors of varying shapes and sizes, and melting processes complicate downstream processing.
Innovation Solution
A demagnetization system with adjustable magnetic poles that can be radially and axially positioned to accommodate different rotor designs, using either DC or AC electromagnetic fields to efficiently demagnetize rotors by adjusting current, frequency, and duration based on flux density monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple demagnetization devices are used to accommodate rotors of various designs and dimensions, then the system can handle different rotor types, but the device complexity and operational efficiency deteriorate
Solution Approach 1:
The magnetic poles are made radially adjustable rather than fixed, allowing a single demagnetization device to adapt to different rotor dimensions. The poles can be moved radially inward or outward to accommodate rotors of various sizes, eliminating the need for multiple fixed-position devices
Solution Approach 2:
The demagnetization device is designed with universal applicability through adjustable magnetic poles that can serve multiple rotor types. A single device can demagnetize various rotor designs by adjusting pole positions, making the system multi-functional rather than requiring separate dedicated devices for each rotor type
2Ease of operation
If induction heating coils are used to melt joints and demagnetize magnets, then the magnets can be removed, but energy consumption increases and downstream processing becomes complex
Solution Approach 1:
The invention extracts the heating function from the demagnetization process. Instead of using induction heating coils to melt joints and demagnetize magnets simultaneously, the system uses only electromagnetic fields for demagnetization, separating these functions and eliminating the energy-intensive heating step
Solution Approach 2:
The invention replaces the thermal field (induction heating) with a pure electromagnetic field approach for demagnetization. By substituting the heating mechanism with direct electromagnetic demagnetization, the system reduces energy consumption and avoids the complexity of melting and downstream thermal processing
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 system efficiently demagnetizes rotors of various dimensions and designs, reducing magnetic flux efficiently and allowing for easier recycling of permanent magnets without melting, thus enhancing applicability and efficiency.
Implementation Method 1
decreasing the magnetization of the electric machine rotor via an electromagnetic field generated by the demagnetization system
Implementation Method 2
adjusting a position of the magnetic poles in relation to an electric machine rotor
Data Source
AI summary
Methods and systems for demagnetizing a rotor. The method includes, in one example, adjusting a position of magnetic poles mounted on a frame in a demagnetization system in relation to a first electric machine rotor, and decreasing the magnetization of the first electric machine rotor via operation of the demagnetization system to generate an electromagnetic field.