Abstract:
An electrical machine (22) incorporates foil bearings (24) which are radially interposed between the stator assembly (26) and the permanent magnet of a rotor shaft (12), thus reducing the required axial length of the shaft and increasing the rotational speed at which the shaft bends incident to resonance.
Abstract:
The method includes fabricating a plurality of elongated high permeability flux carrying members (86), and preparing n wire bundles (84) each having a predetermined length. The n wire bundles (84) are wound to provide a distributed winding configuration having a plurality of elongated open spaces (86A). The plurality of flux carrying members (86) are inserted into the plurality of open spaces (86A) to provide a winding/flux carrying member assembly. A bonding material (180) is provided around the winding/flux carrying member assembly to provide a rigid structure.
Abstract:
A permanent magnet excited electric machine comprises a stator part and a moving part that is movable in relation to the stator part, one of said stator and moving parts having an electric winding system in the form of a single or multiple 3 -phase system, and the other one of said stator and moving parts having permanent magnets. The permanent magnet excited electric machine is designed for a rated power in the range between 100 kW and 20 MW, and the winding system has an inductance such that the related total reactance x B during rated operation according to x B = ω Β · L Y · P B /(Z 3P · U i,B 2 ) is at least 0.8. In said equation ω Β is the electric angular frequency of the winding system during rated operation, L Y is the phase inductance of the winding system in star connection, P B is the power of the machine during rated operation, Z 3P is the number of 3-phase systems of the machine, and U i,B is the amount of the induced conductor voltage during rated operation. The winding system is connected in the form of a delta connection, thus reducing the power loss in this type of machine.
Abstract:
相間絶縁部分放電検査装置は、式「tr>(τ coil ・V max )/(PDIV)」を満足する電圧立ち上がり時間trのインパルス電圧を回転電機(2)に印加するインパルス電源(1)と、インパルス電圧を回転電機(2)に印加したときに発生する部分放電を計測する計測部(12)と、計測部(12)で部分放電が計測されない場合に相間絶縁性能合格と判定する判定部(15)と、を備える。ただし、τ coil は回転電機巻線の1コイルのサージ伝播時間、PDIVは巻線ターン間の部分放電開始電圧、V max は相間絶縁の部分放電試験電圧のピークである。
Abstract:
A turbocompressor system comprising a high speed motor (10) comprising a rotor (12) mounted in a rotative manner relative to the stator, whereby on said rotor (12) one or more impellers (11) are directly fixed, said stator comprising active motor structures and a shell (7), comprising a ferromagnetic stator core (6) and a winding being constructed as toroidally wound coils (5), said shell (7) being constructed in such a manner as to create additional open space between said stator core (6) and said shell (7), constituting a cooling channel (15) through which process gas is passed axially for directly cooling said active motor structures and the rotor (12), prior to compression by said one or more impellers (11).