- Magnetization vector and angle measurement
Magnetization vector and angle measurement
The MagFit magnet analysis software module offers advanced Magcam data analysis capabilities for a complete characterization of uniaxial permanent magnets. By comparing the measured data with theoretical magnet models, MagFit can extracts the magnet’s full magnetization vector (Mx, My and Mz components) and its deviation angle from the main axis.
The first step in making a MagFit analysis is the measurement of a magnetic field image of the magnet under test using the Magcam magnetic field camera.
What MagFit essentially does, is reproducing the measured magnetic field distribution, using a theoretical model of a magnet with a homogeneous magnetization, from which the magnetic field distribution can be calculated. This is done by optimizing a set of model parameters.
Currently, magnet models are available for block, cylinder and ring magnets. The input parameters for the magnet model are the following:
- Geometry of the magnet (block, cylinder, ring)
- Dimensions of the magnet (a,b,c dimensions for blocks, diameter and height for a cylinde, ring)
- Three Cartesian components of the magnetization vector of the magnet (Mx, My, Mz)
- Lateral position of the magnet on the Magcam sensor (measured relative to the sensor pixels; (6.4mm,6.4mm) is the center)
- Lateral angular position of the magnet, i.e. the angle the magnet axes make to the sensor’s X- and Y- axes
- Measurement height, i.e. how far from the magnet the Magcam sensor is located
Using the above input parameters, MagFit is able to calculate a magnetic field distribution for the theoretical magnet. The user is required to provide initial parameters for the model and indicate which parameters should be kept fixed during optimization and which parameters are variable and can thus be optimized.
The MagFit element is located under the ‘Analysis’ submenu.
The components of the magnetization vector are automatically converted to spherical coordinates and displayed in the table at the bottom left. This table displays following magnetization properties:
- Main magnetization direction
- ‘M’: Remanence magnetization vector size
- ‘Theta’: Angle of the magnetization vector with respect to the main magnetization direction (‘angle deviation’)
- ‘Phi’: Orientation of the magnetization vector projection on the plane perpendicular to the main magnetization direction
A compass plot also shows the magnetization vector graphically.