Patent ID: 8390236
Filing Date: 2013-03-05
Classification: H01H,H02K

Abstract:
1. A drive system for operating an electric device by acting on a movable part of the electric device, said drive system comprising: an electric motor having a stator winding and having a permanent magnet rotor connectable to said movable part of said electric device for controlling the operation of said electric device by a limited-angle rotation; and an electric drive circuit connected to said stator winding, wherein said permanent magnet rotor is arranged to be aligned to a magnetic field created by said stator winding when the stator winding is supplied with current from said electric drive circuit, so that a maximum torque will be applied to said rotor and thereby to said movable part within an interval of ±25 degrees around a middle position between two end positions of said limited-angle rotation of said rotor, said electric drive circuit including at least three branches connected in parallel, each branch having a mechanical relay and a capacitor bank connected in series, said electric drive circuit further including a fourth mechanical relay for enabling a current direction reversal.