Abstract: A supplementary access control system for an RFID-controlled cat flap includes a sensor for detecting an approaching cat and a camera for recording at least one image of the approaching cat, an image processing unit that is coupled to the camera and configured to determine, on the basis of the at least one image, whether the cat is carrying a prey animal in its mouth; a radio-frequency signal generator that is configured to transmit an interfering signal, wherein the interfering signal is suitable for preventing an opening of the RFID-controlled cat flap, and a control unit that is coupled to the sensor, to the image processing unit, and to the radio-frequency signal generator, wherein the control unit is configured: on the basis of the detection of the approaching cat, to cause the radio-frequency signal generator to transmit the interfering signal; and on the basis of the determination by the image processing unit that the cat is not carrying a prey animal in its mouth, to cause the radio-frequency signal g

Abstract: A stator cooling arrangement for a stator of an electric drive engine in a motor vehicle, having stator core cooling with a first coolant and stator winding head cooling with a second coolant which differs from the first coolant.

Abstract: An electric traction machine, a motor vehicle, and a method for controlling dissipated heat in the electrical power plant of the motor vehicle are described herein. The power plant is supplied with a current, where, in order to provide a predetermined amount of dissipated heat, a ratio between a field-forming and a torque-forming current deviating from an optimum ratio for a respective operating point of the power plant is prescribed. The predetermined dissipated heat is provided by a power plant embodied as a magnet-less three-phase alternator while a rotor current flowing through a rotor of the three-phase alternator is adjusted, the field-forming and the torque-forming currents being prescribed such that acoustic interference signals of the three-phase alternator are minimized by the ratio, and the rotor current is adjusted such that the predetermined dissipated heat is provided by a combination of the rotor current and the ratio minimizing the interference signals.

Abstract: An electric traction machine, a motor vehicle, and a method for controlling dissipated heat in the electrical power plant of the motor vehicle are described herein. The power plant is supplied with a current, where, in order to provide a predetermined amount of dissipated heat, a ratio between a field-forming and a torque-forming current deviating from an optimum ratio for a respective operating point of the power plant is prescribed. The predetermined dissipated heat is provided by a power plant embodied as a magnet-less three-phase alternator while a rotor current flowing through a rotor of the three-phase alternator is adjusted, the field-forming and the torque-forming currents being prescribed such that acoustic interference signals of the three-phase alternator are minimized by the ratio, and the rotor current is adjusted such that the predetermined dissipated heat is provided by a combination of the rotor current and the ratio minimizing the interference signals.

Abstract: A method for forming an aluminum alloy riser includes forming a riser tube from an aluminum alloy. At least one flanged coupling is formed from the aluminum alloy. The flanged coupling is friction stir welded to one end of the tube. In one embodiment, an end of the tube is radially plastically expanded prior to welding the flange to the one end of the tube.