By Oliver Drubel
Converter pushed purposes are utilized in additional and extra tactics. virtually any put in wind-farm, send drives, metal generators, numerous boiler feed water pumps, extruder and lots of different purposes function even more effective and fiscal in case of variable pace ideas. The boundary stipulations for a motor or generator will switch, whether it is provided via a converter. an electric desktop, that's operated via a converter, can now not be considered as an autonomous part, yet is embedded in a approach such as converter and machine.
This ebook provides an summary of present converter designs for giant electric machines. tools for the proper calculation of computing device phenomena, that are implied by way of converters are derived within the strength diversity above 500kVA. it's proven how a result of converter inherent greater voltage harmonics and pulse frequencies specific phenomena are triggered contained in the laptop that are the cause of malfunction. it really is verified that extra losses create extra temperature raises or voltage peaks. The booklet describes how torque ripple can take place, which endanger the mechanical shaft method and final yet no longer least shaft voltages are prompted, that are occasionally adequate in amplitude to wreck bearings or to disturb sensors of the security preparations.
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Additional info for Converter Applications and their Influence on Large Electrical Machines
27. 27) iw,i t , with Fw, j = q q 1 N turn rk + k ⋅ ( pi ⋅ q k + pi-1 ⋅ q k ) + rk − k -1 ⋅ ( pi ⋅ q k -1 + pi-1 ⋅ q k -1 ) . 5 . 5 to be numerically stable, but can be chosen slightly below in order to provide damping for spurious numerical oscillations. The machine model is linked to the external circuit which is made of lumped elements with m = 9 line-to-ground voltages u A,1… 9 . These occur as common variables of the FD-model and the circuit equations. The following mesh equations are set up for a polygonal connection of the machine windings.
The losses have been calculated with a permeability which is constant in time. 4 Eddy Current Losses within Massive Magnetic Material 57 surface of the armature consisting of 10 segments in the circumferential direction, each with the same magnitude of current density but a changing phase to model relative movement with respect to the pole. This current distribution is shown in fig. 9. Adaptive mesh generation with automatic mesh refinement based on the flux density has been used. The boundaries are periodic in the traveling direction and the vector potential is set to zero at the other boundaries, where the field is negligible.
Drubel: Converter Appl. & their Influence on Large Electr. , LNEE 232, pp. 27–44. 1007/978-3-642-36282-8_3 28 3 Calculation-Methods for Converter Fed Electrical Machines by L1 and L2 . Mutual inductivities are described by M 1,2 and M 2,1 . These inductivities are not those of single circuits, but include the influence of the other phases in the rotor or stator. Three leakage components are considered with the slot leakage LN1 , LN2 , the end winding or ring leakage LS1 , LR2 and the air-gap leakage, which is given by the factor σ d1 , σ d2 .