Multi-Path Stator Winding Layout for Lower Torque Ripple
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Solution Overview
Problem
Designing a stator for electrical machines that maintains symmetry, reduces winding overhang, and minimizes harmonics and ohmic losses while ensuring high-quality rotating field and simple phase connection options.
Innovation Solution
A stator with multiple phases and pole pairs, featuring radially stacked shaped conductors in grooves, with specific arrangements of winding zones and connectors to achieve spatial displacement of the rotating magnetic field and efficient use of installation space, reducing torque ripples and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If winding zones extend over exactly q slots, then the stator structure is compact, but torque ripples, noise, and vibrations increase
Solution Approach 1:
The patent extends winding zones from exactly q slots to at least q+1 slots in the circumferential direction, adding a dimensional extension to the winding zone configuration. This spatial extension in the circumferential dimension creates spatial displacement of the rotating magnetic field along the axial direction, reducing torque ripples and noise while maintaining compactness
2Ease of operation
If connectors are arranged densely on stator end faces, then phase connection options are simple, but installation space is insufficient
Solution Approach 1:
The patent utilizes the axial dimension by arranging connectors on both the first and second end faces of the stator core, effectively distributing connection points across two dimensional planes. This allows interlaced connector arrangements that efficiently use installation space while maintaining simple phase connection options
Solution Approach 2:
The stator winding is divided into multiple paths (at least two paths per phase), with connectors distributed across different end faces. This segmentation of the connection system allows efficient space utilization on each end face while providing multiple connection routes for phase connections
3Quantity of substance
If shaped conductors are arranged in multiple layers, then the number of turns is increased, but winding overhang increases
Solution Approach 1:
The patent arranges shaped conductors in four radially stacked layers within slots, utilizing the radial dimension to increase the number of turns. Combined with extending winding zones in the circumferential direction to at least q+1 slots, this creates spatial displacement that reduces winding overhang while maintaining the required number of turns through multi-layer configuration
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
The solution effectively reduces torque ripples, noise, and vibrations, while minimizing material requirements and ohmic losses, leading to improved efficiency and compact connection windows.
Implementation Method 1
a stator core (2) having a plurality of slots (3) formed in a circumferential direction, and a plurality of shaped conductors (4) arranged radially layered in the slots (3) in a first to fourth layer
Data Source
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AI summary
The invention relates to a stator (1) for an electric machine (101), having a number N ≥ 3 of phases (U, V, W), a number P ≥ 2 of pole pairs, a hole count q ≥ 2, a stator core (2) which has a plurality of grooves (3) formed in a circumferential direction, and a plurality of shaped conductors (4, 22a-d, 24a-d) which are arranged in the grooves (3) in a first to fourth layer (18a-d); wherein the shaped conductors (4, 22a-d, 24a-d) form at least two paths (15a, 15b) for each phase (U, V, W) and are arranged in 2 P winding zones (20, 23a-h, 25a-p) which extend over the four layers (18a-d) and at least q+1 immediately adjacent grooves (3); wherein the shaped conductors (4, 22a-d, 24a-d) of each path (15a, 15b) are interconnected in a series circuit, which is realised by connectors (8, 8a, 8b, 10) arranged on a first end face (7) of the stator core (2) and on a second end face (9) of the stator core (2) opposite the first end face (7); wherein each path (15a, 15b) has groups of a first type (16a-d) of shaped conductors (4, 22a-d) connected in series and groups of a second type (17a-d) of shaped conductors (24a-d) connected in series; wherein shaped conductors (22a-d) of the first-type groups (16a-d) are arranged over the winding zones (20, 23a-h) in the circumferential direction alternately, on the one hand in the first and fourth layer (18a, 18d) and, on the other hand, in the second and third layer (18b, 18c), and shaped conductors (4, 24a-d) of the second-type groups (17a-d) are arranged in the other layers (18a-d).