Abstract: In order to suppress virtually completely the cyclic power variation of a linear synchronous motor, the latter has the following features. At least one primary part (1) and at least one secondary part (6), which has a sequence of poles (10) formed by permanent magnets, and is also larger than the length of the primary part (1) in the movement direction (5). The primary part (1) has primary slots (9) which are suitable for receiving monophase or polyphase windings. Moreover, the primary part (1) has means for changing the magnetic force in the movement direction (5) of the linear motor in the region of the end piece (2) of the primary part (1). The end faces (14) of the end pieces (2) extend perpendicular to the movement direction (5) of the linear motor.

Abstract: An arrangement includes an electrically operated production machine having at least one electrically operated motor and a machine element, and a temperature control system for maintaining the machine element at a controlled temperature. The temperature control system includes a heating unit which is integrated in a machine-internal heat exchange process to use thermal losses generated by the motor to heat the machine element.

Abstract: A rotor for permanent magnet synchronous machines with a reduction in the stray flux transmitted through the rotor shaft includes substantially ring-shaped punched sheet metal plates with a central opening for receiving the rotor shaft, and a plurality of recesses arranged in the circumferential direction, wherein at least two permanent magnets can be inserted in each of the recesses. A corresponding intermediate sheet metal segment is arranged or can be arranged in each of the recesses between the permanent magnets. At least one of the recesses is shaped so as to form an air gap between the surface of the intermediate sheet metal segment that is oriented radially inwardly towards the center and an edge of the recess that is oriented radially outwardly from the center, when the permanent magnets are inserted radially towards the outside. The air gap aids in attenuating the stray flux.

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.

Abstract: An electric machine, includes a rotor and a shaft centered interiorly of the rotor. An excitation structure is provided for generating a torque upon at least portions of the rotor. The torque from the excitation structure is picked up by a torque receiving structure on the rotor to impart the torque onto the rotor. Disposed between the torque receiving structure and a force-transfer structure for transmitting the torque from the rotor to the shaft is a web structure by which the torque is transmitted to the force transfer structure while effecting an inertial mass relief of the rotor.

Abstract: An injection unit for an injection-molding machine for processing thermoplastic material is designed in such a way that a direct drive (EM) which meets high dynamic requirements is used for the injection operation and that a standard motor (DM), the rotational speed of which is optimized to the material preparation process by a gear mechanism (R, RS1, RS2), is used for the material preparation, in which such dynamic requirements do not exist.