Hairpin Winding Layout for Balanced Parallel Motor Currents
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Solution Overview
Problem
Existing electric motor winding structures experience uneven electromagnetic coupling between parallel-wound branches, leading to unbalanced current flows and increased copper loss, affecting motor performance.
Innovation Solution
A winding structure for electric motors with hairpin-type conductors arranged in non-adjacent layers and connected in specific patterns to balance counter-electromotive forces, reducing additional electrical losses and improving heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conductors of the same sub-winding are placed in adjacent layers, then winding compactness is improved, but electromagnetic coupling between parallel branches becomes uneven causing unbalanced current flows
Solution Approach 1:
The patent segments the conductor arrangement by placing conductors of the same sub-winding in non-adjacent layers rather than adjacent layers. This segmentation reduces the electromagnetic coupling between parallel branches while maintaining winding compactness through optimized spatial distribution within the slot structure.
Solution Approach 2:
The patent applies different spatial arrangements to different conductors within the same winding structure. Specifically, conductors of the same sub-winding are placed in non-adjacent layers to create localized electromagnetic field distribution that reduces coupling effects, while maintaining overall winding compactness.
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 balances counter-electromotive forces, eliminates current loops, reduces electrical losses, and enhances power density and heat dissipation, leading to improved motor performance and efficiency.
Implementation Method 1
the winding structure makes it possible to balance the counter-electromotive forces induced by the parallel-wound sub-windings of each phase of winding structure of stator under load operation
Data Source
AI summary
Disclosed are a winding structure for an electric motor and an electric motor. The electric motor comprises an iron core (1) and a multi-phase winding structure (2), wherein the iron core (1) is provided with a plurality of grooves (11) arranged in the circumferential direction, and one side of the iron core (1) is an inserting side, and the other side is a welding side; the multi-phase winding structure (2) is arranged in the plurality of grooves (11) of the iron core (1), each phase of the winding structure (2) comprises N parallel winding sub-windings formed by a plurality of hairpin conductors of different shapes, and N is a positive even number; and the conductors, forming each phase of the winding structure (2), of the same sub-winding are located on a non-adjacent conductor layer corresponding to the grooves (11).