Permanent Magnet Alignment Control by Magnetic Induction Measurement
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The manufacture of magnets with desired magnetic properties is challenging due to variations in mechanical dimensions and magnetic properties, which can exceed tolerance ranges caused by material anisotropy and magnetization, affecting their ability to exert sufficient force in applications.
Innovation Solution
A method and device for controlling magnet manufacture using a sensor to measure magnetic induction components, aligning the magnet's mechanical axis with the sensor's measurement axis, and rotating the magnet to calculate the angular deviation of the equivalent magnetic moment, ensuring the magnet meets specified properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the magnet is manufactured with correct mechanical dimensions, then the magnet meets dimensional specifications, but the magnetic properties can vary significantly and be outside permitted tolerance ranges
Solution Approach 1:
The patent implements a feedback control system where magnetic induction is measured during manufacturing, and the magnetization process is adjusted based on these measurements to ensure magnetic properties remain within tolerance ranges, resolving the contradiction between dimensional precision and magnetic property reliability
Solution Approach 2:
The patent changes manufacturing parameters by introducing controlled variations in the magnetization process based on measured magnetic induction values, allowing adjustment of magnetic properties while maintaining dimensional specifications to ensure both mechanical and magnetic requirements are met
2Ease of manufacture
If material anisotropy is present to enable magnetization, then the magnet can be magnetized effectively, but magnetic properties vary due to this anisotropy
Solution Approach 1:
The patent applies local quality control by measuring magnetic induction at specific locations and orientations during manufacturing, and adjusting magnetization parameters locally to compensate for material anisotropy effects, ensuring consistent magnetic properties despite the inherent anisotropic nature of the material
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 method allows for precise characterization of the magnet's manufacturing quality by measuring the equivalent magnetic moment, ensuring the magnet's properties align within acceptable thresholds, thus ensuring the magnet's performance in applications.
Implementation Method 1
measuring a component of the magnetic induction produced by a magnet using a sensor
Data Source
Figure 1~2
Figure 3~4
Figure 5~7
AI summary
The invention relates to a method for controlling the production of a magnet (12) using a sensor capable of transmitting a signal signalling the presence of a magnetic induction and defining a measurement axis, the magnet (12) being a permanent magnet with rotational symmetry around an axis, referred to as the mechanical axis, the magnet (12) having a centre and a maximum dimension, the method comprising at least the following step: a) performing a first measurement, using the sensor, of a component of the magnetic induction produced by the magnet (12), b) performing a second measurement, using the sensor, of a component of the magnetic induction produced by the magnet (12), and c) calculating, from the first measurement and the second measurement, the angular deviation of the equivalent magnetic moment of the magnet (12).