Abstract: Driving system with converter control for low voltage three-phase motors, which is provided with a power unit containing transistors and capacitors, a triggering unit for the transistors and a control unit as well as connections for direct and alternating current, the units being disposed in a common casing made of a heat-conductive material, characterised by the following features: the power unit is provided with a first printed circuit board (24) made of fairly heat-conductive material, which is disposed on the fairly heat-conductive bottom of the casing (12) in a plane fitting arrangement, a second printed circuit board (26) contains the triggering unit, the second printed circuit board (26) being electrically and mechanically connected to the first printed circuit board (24) in a spacing to it with the aid of contact pins (30) of metallic material attached on the first printed circuit board (24) by soldering, and terminal pins (22) are connected with contact points (38) of the first printed circuit board

Abstract: Driving system with converter control for low voltage three-phase motors, which is provided with a power unit containing transistors and capacitors, a triggering unit for the transistors and a control unit as well as connections for direct and alternating current, the units being disposed in a common casing made of a heat-conductive material, characterised by the following features: the power unit is provided with a first printed circuit board (24) made of fairly heat-conductive material, which is disposed on the fairly heat-conductive bottom of the casing (12) in a plane fitting arrangement, a second printed circuit board (26) contains the triggering unit, the second printed circuit board (26) being electrically and mechanically connected to the first printed circuit board (24) in a spacing to it with the aid of contact pins (30) of metallic material attached on the first printed circuit board (24) by soldering, and terminal pins (22) are connected with contact points (38) of the first printed circuit board

Abstract: A seal apparatus for a jet pump slip joint in a boiling water nuclear reactor pressure vessel, in an exemplary embodiment, includes a split seal ring and a segmented diaphragm spring engaging the split seal ring at an inner circumference of the diaphragm spring. The diaphragm spring includes a plurality of latch assemblies spaced circumferentially around an outer circumference. A plurality of slots, spaced circumferentially around the inner circumference, extend from the inner circumference to the support portion. Each latch assembly includes a latch bolt extending through and threadendly engaging a corresponding latch bolt opening in the diaphragm spring. Each latch bolt includes a head and a plurality of ratchet teeth spaced around the periphery of the latch bolt head. A locking spring is positioned to engage the ratchet teeth of the latch bolt head. The latch assembly further includes a latch arm coupled to the latch bolt. The latch arm includes a slot sized to receive a diffuser guide ear.

Abstract: Method for determining internal stresses in structural members in machine or apparatus manufacturing by machining, around a measuring location provided with strain gages, a circular slot into the surface of the structural member that is to be measured, measuring changes in strain of the core of the measuring location left standing, and calculating the internal stresses from the measured strains and a depth-dependent decay function determined on a calibrating material sample, the improvement therein affording the determination of internal stresses in the structural members at depths greater than about 5 mm, includes the steps of mechanically removing the measuring-location core down to a new surface at the base of the circular slot, securing a strain gage to a new measuring location at the new surface, machining another circular slot around the new measuring location, measuring changes in strain of the core of the new measuring location left standing while measuring changes in strain thereof and repeating the