A direct current regulator, also known as chopper, built with fast switching IGBT-semiconductor switches was investigated in regard to its effects on windings and motor bearings. The high voltage increasing velocity (du/dt) of these regulators leads to a very high voltage stress over the first turns of a winding and to a heightened motor bearing stress. To reduce the stresses which claim the motor, the installation of a filter combined with an inductor is explored. not assigned KP: Partner aus der Industrie
|Effective start/end date||1/07/00 → 31/03/01|
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