Abstract:
PROBLEM TO BE SOLVED: To solve some defects in a spring preload system or in a manufacturing process of a slot-closing device that fixes a conductor or a winding bar to a slot. SOLUTION: The slot-closing device includes a sliding block 2 and a pressurizing piece 3. At least one spring element 4 is provided between the sliding block 2 and the pressurizing piece 3. The spring element 4 can apply a preload, by a mounting means cooperating with the sliding block and the pressurizing piece. Accordingly, by the assembly, mounted in advance, is constituted. After positioning the slot closing device 1 at the slot, the mounting means can position and mechanically move the slot closing device 1 for the spring force of at least one spring element from a first position to a controllable second position. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To specify a method for operating a converter circuit, and reduce thereby a harmonic component in system voltages of an AC voltage system connected with the converter circuit. SOLUTION: In the converter circuit which has a converter 2 having a large number of drivable power semiconductor switches and has a three-phase AC voltage system 1, the drivable power semiconductor switches are driven by means of a drive signal S A formed from a control signal S R , and the control signal S R is formed by adjusting an H-th harmonic component i NH of system currents to a system current set point value i NHref . In order to reduce a harmonic component in the system voltages, the system current set point value i NHref is formed by adjusting an H-th harmonic component of system voltages to a predeterminable system voltage set point value u NHref , the control difference from the H-th harmonic component of the system voltages and the system voltage set point value u NHref being weighted by a system impedance y NH determined with respect to the H-th harmonic component. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To eliminate the problems, wherein a first capacitive energy store is charged by a DC-voltage source and as a result, a higher loss is generated during a charging process, when a first switch is closed, and a second switch is opened. SOLUTION: A converter circuit is specified in which, in order to avoid losses to the greatest possible extent, a first inductance L1 is connected in series into the connection of a DC voltage source 1 of the converter circuit to a first switch S0 of the converter circuit, and in which, moreover, a second inductance L2 is connected in series into the connection of a second switch S1 of a switching group 2 of the converter circuit to the junction point between a second capacitive energy store CA and a second unidirectional non-drivable power semiconductor switch D2 of the switching group 2. Two further alternative converter circuits and also a method for operating the converter circuits are furthermore specified. COPYRIGHT: (C)2009,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a cooling element having a improved cooling capacity. SOLUTION: The cooling element (1), which is composed of metal or a metallic alloy having at least one cooling rib (4) connected with a metal housing (11) of equipment to be cooled, is equipped a film 2 for conducting heat and insulating electricity, and the cooling element (1) possesses the same potential as that of the housing (11), and an electric circuit passing through the housing (11) and a path for leading out the heat are completely separated from each other even though there is close connection between the housing (11) and the cooling element (1). COPYRIGHT: (C)2004,JPO