Abstract: A positioning device includes a housing and a shaft that is able to be swiveled about a centrical position relative to the housing, at whose one end an element that is to be positioned is attachable. Furthermore, the positioning device has a swivel drive and a position measuring device. A cable, for the electrical connection of swivelable parts in the positioning device to a stationary unit, has a spiral-shaped course leading radially outwardly, starting from the shaft that is located in the centrical position.

Abstract: A positioning device includes a housing and a shaft that is able to swivel relative to the housing and at one end of which an element to be positioned is attachable. The positioning device further includes a roller-bearing unit for supporting the shaft with respect to the housing, a swivel drive and a position-measuring device. The shaft is arranged in a manner that it is torsionally stiff, but axially movable relative to the housing via a ring diaphragm secured to the roller-bearing unit and to the housing.

Abstract: A voice-coil motor includes a stator and a rotor, which is pivoted about a swivel axis, with respect to the stator. The rotor and/or the stator has a printed circuit board that includes at least one circuit-board conductor, and the at least one circuit-board conductor is arranged such that it forms at least one coil unit in a plane, the at least one coil unit including several circuit traces. Within one coil unit, more than two circuit traces have a section, in which the specific circuit trace is oriented in the direction of the swivel axis.

Abstract: A positioning device includes a housing and a shaft that is able to be swiveled about a centrical position relative to the housing, at whose one end an element that is to be positioned is attachable. Furthermore, the positioning device has a swivel drive and a position measuring device. A cable, for the electrical connection of swivelable parts in the positioning device to a stationary unit, has a spiral-shaped course leading radially outwardly, starting from the shaft that is located in the centrical position.

Abstract: A positioning device includes a housing and a shaft that is able to swivel relative to the housing and at one end of which an element to be positioned is attachable. The positioning device further includes a roller-bearing unit for supporting the shaft with respect to the housing, a swivel drive and a position-measuring device. The shaft is arranged in a manner that it is torsionally stiff, but axially movable relative to the housing via a ring diaphragm secured to the roller-bearing unit and to the housing.

Abstract: A positioning device includes a swiveling shaft, at one end of which an element to be positioned may be attached, a swivel drive, made up of a rotor, which is movable relative to a stator, a position measuring device, made up of two parts movable relative to each other, and a roller bearing, which includes several rolling elements. The rotor of the swivel drive and a first part of the position measuring device are connected to the shaft in a rotatably fixed manner. The rolling elements are made of a ceramic material.

Abstract: A voice-coil motor includes a stator and a rotor, which is pivoted about a swivel axis, with respect to the stator. The rotor and/or the stator has a printed circuit board that includes at least one circuit-board conductor, and the at least one circuit-board conductor is arranged such that it forms at least one coil unit in a plane, the at least one coil unit including several circuit traces. Within one coil unit, more than two circuit traces have a section, in which the specific circuit trace is oriented in the direction of the swivel axis.

Abstract: A positioning device includes a swiveling shaft, at one end of which an element to be positioned may be attached, a swivel drive, made up of a rotor, which is movable relative to a stator, a position measuring device, made up of two parts movable relative to each other, and a roller bearing, which includes several rolling elements. The rotor of the swivel drive and a first part of the position measuring device are connected to the shaft in a rotatably fixed manner. The rolling elements are made of a ceramic material.

Abstract: A method for friction stir welding using liquid cooling. The method includes the steps of moving a pin tool across a welding location, spraying a cooling liquid in a localized manner from a cooling ring moving with the pin tool onto a trailing region and onto lateral regions of the welding location adjacent to the pin tool, and blowing cooling gas from a gas jet moving with the pin tool from a front of the pin tool against the pin tool and against the cooling liquid emerging from the cooling ring. In addition, a friction stir welding and cooling device includes a pin tool configured to move across a welding location and a cooling ring at least partially encircling the pin tool. The cooling ring is configured to move simultaneously with the pin tool across the welding location and includes a plurality of nozzles configured to spray a cooling liquid.

Abstract: The aim of the invention is to achieve a method for friction stir welding, whereby the welding of alloys with high oxygen affinity and/or high plasticisation energy is possible and the heat flux from the welding location is easily controlled. Said aim is achieved whereby the cooling liquid from a cooling ring (2), moving with the pin tool (1), is physically limited to being sprayed on the trailing region and the lateral region of the welding location adjacent to the pin tool (1). Additionally, a gas jet (3) moving with the pin tool (1), blows cooling gas from the front against the pin tool (1) and against the cooling water escaping from the cooling ring (2).