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A Complete Solution for Permanent Magnet Rotor Inspection

Magcam's hardware and software work harmoniously to derive important characteristics of permanent magnet rotors. You can solve your magnetic challenges and optimize your permanent magnet rotors with endless magnetic field analysis features.

For permanent magnet rotors in industrial systems or wind turbines, with rotors larger than 300 mm long and larger than 500 mm in diameter, Magcam can work with you on custom hardware and software tailored to your specific needs.


magnetic field measurement of a permanent magnet rotor

Measuring and analyzing magnetic field distributions

Magcam's Rotor Scanner measures the full three-component magnetic field distribution (radial, tangential, and axial) on the entire rotor's surface in a few seconds at close distances. Magcam's powerful magnetic field analysis software (MagScope) analyzes magnetic fields in great detail. It provides a variety of functions and settings to deliver valuable insights into the magnetic properties of your permanent magnet rotor.

magnetic field visualization of a permanent magnet rotor

Visualizing the north and south poles

MagScope makes it easier with exclusive features to show 2D or 3D color plots and surface plots of magnetic field maps. Moreover, it enables the selection of 2D and 1D (cross-section) regions in Cartesian and polar coordinates for cut-out and analysis.

This screenshot shows the surface plot of the magnetic field in 3D with north and south poles measured at a distance of 0.5mm from the rotor's surface.

magnetic field measurement of the step skew of an internal permanent magnet rotor

Measuring Skewing Angle of Permanent Magnet Rotors

The skewing angle of skewed permanent rotors can be measured and analyzed in great detail with MagScope. Moreover, skewing angle deviations are instantly detected. 

The screenshot shows the step skew of an internal permanent magnet rotor (IPM rotor). The top image shows the magnetic field of the skew. The middle and bottom images show the line plot of the magnetic field with the zero crossings on the left and the quantitative numbers on the right.


magnetic field measurement of the surface permanent magnet rotor

The screenshot shows the continuous skew on a surface permanent magnet rotor (SPM rotor). 

cogging torque analysis for permanent magnet rotor with magcam's magnetic field solutions

Analyzing Cogging Torque

With Magcam's advanced magnetic field measurement systems, it is possible to predict cogging torque from a bare rotor measurement:

  • Measure the high-resolution permanent magnet rotor's surface magnetic field distribution in air
  • Input the stator geometry parameters
  • Calculate the qualitative cogging torque curve
  • Derive the ratios of the quantitative harmonic
  • Predict the cogging torque quality
  • Discard rotors that don't meet your requirements

With a simple Python programmed pass/fail script in MagScope, bad permanent magnet rotors can be identified before being assembled with the stator. This improves permanent magnet motor yield, thus saving valuable time and resources.

A bad rotor with high cogging torque is shown in the screenshot.

noise and vibration analysis for permanent magnet rotors with magcam's magnetic field solutions

Analyzing Noise and Vibration Issues

Highly dominant harmonics can be related to noise and vibration issues at the motor level. MagScope's Fourier analysis offers insights into the contributions of unwanted harmonics in rotors' magnetic field distributions.

The screenshot shows the magnetic field (south/north poles) of the rotor (top), the zero crossings and peaks (bottom left) at the cross-section (grey line in the top figure), and the Fourier spectrum (bottom right)

magnet crack detection for permanent magnets

Individual Rotor Magnet Analysis

Magcam solutions for permanent magnets are applicable to the individual magnets of a rotor as well. For instance, both visible and just-below surface cracks can be identified.  R&D departments can thus determine the best magnet material to minimise cracks. In manufacturing environments cracked magnets can be quickly identified and discarded.


Ready to measure your permanent magnet rotors? Fill out the form and Stephan or Luc, our sales managers will be in touch with you within 48 hours.