Patent ID: 6097122
Filing Date: 2000-08-01
Classification: E05F,E05Y,H02K

Abstract:
A drive unit, comprising an electric motor having a motor shaft; an electrically disengageable arresting mechanism including a hub connectable with said motor shaft, a plurality of arresting teeth radially projecting from said hub, and at least one arresting pin for electrical disengagement of an element composed of windings of an electrically conductive wire and for disengagement of electrical current, said arresting teeth being composed of a magnetically conductive material, said at least one arresting pin being arranged stationary and forming a component of a permanent-magnetic circuit relative to whose poles said arresting teeth are oriented one after the other, said electrically conductive wire being wound to form a magnetic coil which forms at least a partial length of said permanent-magnetic circuit so as to provide a temporary at least partial compensation of a permanent magnetic flux of said permanent-magnetic circuit, said electric motor being formed as a DC-driven commutator motor with two brushes and with two terminal conductors connected to said two brushes, said DC-driven commutator motor being reversible by changing polarities of said two terminal conductors, said magnetic coil being connected with said two brushes through a rectifier circuit formed as a full bridge circuit having four diodes.