Abstract: A plasma accelerator with closed electron drift comprising a dielectric discharge chamber (6) with internal and external annular walls (13) forming an annular accelerating channel, and a magnetic system with sources (3) of a magnetic field, a magnetic path (2), external (4) and internal (5) magnetic poles forming an operating gap in the region of the discharge chamber exit edges. An anode unit (7) with a gas distributor is located in the accelerating channel interior, and the distance from the anode-gas distributor (7) to the accelerating channel exit plane exceeds said channel width. A cathode-compensator (1) is located beyond the exit plane of the discharge chamber (6). Exit parts of the discharge chamber walls (13) facing the accelerating channel are made of conducting material. At least one dividing annular groove (12) is made on each chamber wall between its conducting and main parts.

Abstract: A plasma accelerator with closed electron drift includes a magnetic system (4), a cathode (10), and a discharge chamber with an annular acceleration passage (3) accommodating a hollow anode (7) communicating therewith by way of at least one outlet passage (8). The outlet passage (8) is curved, and a straight line drawn from any interior of anode (7) to any point in the acceleration passage (3) intersects walls of anode (7).

Abstract: A single-phase step motor comprises a stator having a coil and a magnetic circuit composed of a core and a plate having a hole in which is disposed a rotor equipped with a permanent magnet. The plate has a slot in the area of the hole, whose width and the position of the axis line thereof are determined by the magnetic asymmetry of the stator poles, sufficient to produce required driving and positioning torques of the motor.

Abstract: A single-phase step motor comprises a stator having a coil, a core and a plate featuring a hole forming poles of the stator, and a rotor having a permanent magnet and a shaft. The rotor is installed in supports. The poles of the stator, which are magnetically asymmetric, are connected by straps. The rotor and the supports thereof are accommodated inside a capsule made as a body and a cover and placed in the hole of the plate. The capsule is provided with an external cylindrical boss coaxial with the rotor, whereas the body of the capsule is provided with a bearing flange which positions the rotor in relation to the poles of the stator.