Abstract: A drive unit for operating a plastics injection machine includes a rotatably supported bushing intended for accommodation of an extruder screw and a rotor which includes a hollow shaft and is defined by an inner diameter sized to allow passage of the bushing and accommodated extruder screw through the rotor. The rotor is hereby detachably connected with the receiving member in fixed rotative engagement.

Abstract: A harmonic motor with an increased slot surface and copper fill factor is described. A laminated stator core for an electric machine, in particular for a synchronous machine, has a substantially cylindrical bore and a plurality of pole teeth extending radially inwardly in the bore. Each of the pole teeth have an inner free end, with a fixed tooth head affixed to the inner end of each second pole tooth, as viewed in the circumferential direction. A pole tooth with a removable head is arranged between each two pool teeth with a fixed tooth head. For easy installation, windings can only be wound around those pole teeth that have a removable tooth head.

Abstract: A harmonic motor with an increased slot surface and copper fill factor is described. A laminated stator core for an electric machine, in particular for a synchronous machine, has a substantially cylindrical bore and a plurality of pole teeth extending radially inwardly in the bore. Each of the pole teeth have an inner free end, with a fixed tooth head affixed to the inner end of each second pole tooth, as viewed in the circumferential direction. A pole tooth with a removable head is arranged between each two pool teeth with a fixed tooth head. For easy installation, windings can only be wound around those pole teeth that have a removable tooth head.

Abstract: A pair of welding tongs includes two moveable tong arms, with each tong arm including a first arm element with an electrode, a second arm element, and a connecting element disposed between the first and second arm elements, whereby the connecting elements of the tong arms can rotate about a common fixed reference point. An articulated lever is connected to the second arm element. The pair of welding tongs further includes a mechanical coupling to link the, articulated levers of the tong arms, and a drive unit for driving the mechanical coupling. The motion of the mechanical coupling is transmitted to each tong arm of the welding tongs.