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Common defects in electromagnetic actuators due to the manufacturing process are heterogeneous magnetic properties of the materials, cracks and defects in the magnetic materials and parasitic air gaps in and directly around the magnetic circuit. Considering the high cost pressure, test systems must be adapted to the increasing complexity of the components and be able to detect defects completly in-situ. For these requirements the novel and non-destructive measurement system is suitable to monitor and assure quality of magnetic actuators within the manufacturing process. The measuring principle is based on the characterization of the magnetic circuit according to the magnetic stray fields that can be quantified by hall-sensor measurement outside the circuit. The intensity of that stray field is dependent on the magnetic flux density in the magnetic circuit. Therefore parameter variations, for example due to the components assembling can be detected in an early stage of the manufacturing process automatically and "in-line".

A7.3 - Measurement System for the Characterization of Magnetic Actuators on the base of Magnetic Stray Fields