Abstract: An electric drive with manual doubler comprises an electric motor (1), a frame (2), a sleeve (5), a lead screw (6), a sliding nut (10) eccentric to the axis of the lead screw (6), a gear wheel (12) eccentric to the axis of the lead screw (6). The gear wheel (12) is connected with the sliding nut (10), capable of restricted angular displacement with respect thereto, and is in engagement with a gear bush (13). This bush is arranged concentric with the lead screw (6) and rotatably mounted within the frame (2), the inner surface of the gear bush (13) serving as the datum surface for the lead screw (6). The electric drive comprises a manually operated hand wheel (15) rigidly coupled to the gear bush (13).

Abstract: An asynchronous motor comprising a stator 1, a rotor including a core 2 and a multilayer screen 3. Each layer 4 of the screen 3 is made of an iron-containing alloy of high electrical conductivity, the value of electrical conductivity in each of the succeeding layers, in the direction of the rotor axis, being assumed to be decreasing.

Abstract: An electric drive comprises a base (1), an electric motor including a frame (2) and, mounted therein, a stator (3) and a rotor (4), a lead screw (5), an axial force limiter disposed between a bearing surface (12) of the base (1) and a pressure surface (13) of the frame (2) of the electric motor and comprising washers (9) and (10) with a resilient member (11) placed therebetween. The electric motor frame (2) is axially displaceable and kinematically coupled with the axial force limiter. The base (1) is provided with a stop (14) facing the pressure surface (13) of the frame (2), and the frame (2) is provided with a stop (15) facing the bearing surface (12) of the base (1).