Stator Winding Wire Segmentation to Reduce Copper Losses
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Solution Overview
Problem
Stators of electric machines with parallel wires in slots experience unfavorable wire positioning, leading to compensating or circuit currents that result in additional copper losses due to interlinking of different windings' magnetic fluxes.
Innovation Solution
The parallel wires in the same slot are arranged within a common slot section with layered regions in the radial direction, where wires belonging to the same winding side are placed in the same layered region, and the radial height of these regions is optimized to reduce compensating currents, with adjacent regions overlapping to minimize copper losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If parallel wires are arranged in slots to reduce skin effect, then current distribution is improved, but unfavorable wire position causes interlinking of magnetic fluxes and compensating currents that increase copper losses
Solution Approach 1:
The slot section is segmented into multiple layered regions in the radial direction, with each layer containing wires from the same winding side. This segmentation prevents interlinking of magnetic fluxes from different windings by spatially separating wires belonging to different winding sides into different radial layers, thereby reducing compensating currents and copper losses while maintaining the parallel wire configuration for skin effect mitigation
Solution Approach 2:
Different radial regions of the slot section are assigned different functional qualities: wires in inner radial layers are positioned to experience different magnetic flux conditions than wires in outer radial layers. This local differentiation of wire positions within the slot enables optimized magnetic coupling characteristics for each layer, reducing harmful compensating currents while maintaining overall winding performance
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This arrangement effectively reduces compensating currents and associated copper losses by optimizing wire placement within the stator slots, enhancing the efficiency of the electric machine.
Implementation Method 1
an electrical winding that comprises multiple winding branches is provided in said slot branches. The multiple winding branches comprise in each case multiple parallel wires
Implementation Method 2
The multiple winding branches comprise in each case multiple parallel wires so as to reduce the so-called skin effect
Data Source
AI summary
Stators are already known which in each case comprise an annular stator stack having grooves which are open towards an axis of the stator and in which an electrical winding is provided which comprises a plurality of winding branches. The plurality of winding branches each have a plurality of parallel wires for reducing the so-called skin effect. The parallel wires are arranged in the grooves, wherein the winding branches in their configuration each form a plurality of turns of a coil which are each part of an electrical coil, wherein a turn of a coil is formed in each case by two sides of a turn, lying in different grooves, of one of the winding branches and by a turn side connector which connects the two sides of a turn to one another. In electrical windings having parallel wires, an unfavourable wire position and a resulting linking of different magnetic flows may lead to disadvantageous compensating or circular currents which produce additional copper losses in the electric motor. In the stator according to the invention the compensating or circular currents in the parallel wires are avoided or at least decreased. According to the invention, the parallel wires (Z) which are arranged in the same groove (2) are in each case provided in a common groove section (yf) of the respective channel (2) having a groove section height (Hf), wherein the groove section (yf) in each case comprises, arranged one above the other in the radial direction, layered regions (y1 . . . yn), wherein in each case the parallel wires ( ) which belong to the same side of a turn are arranged in the same layered region (y1 . . . yn) of the groove section (yf).