Defects detection in laminated and soft magnetic composites devices with a novel thermographic method

The realization of electromagnetic devices may implies the presence of local losses caused by material defects or by magnetic anomalies caused by mechanical processing. The problem of such defects location is the object of the present work; the aim of obtaining information about imperfections or defects with a non invasive inspection has been pursued. The adopted approach is based on the observation of the device under test with a particular thermographic camera; no limitations in size and shapes devices are considered and the method can be widely adopted. Examples of defects in the magnetic circuit realization are described, both for traditional ferromagnetic laminated sheets and for Soft Magnetic Composite