Winding Arrangement for Balanced Electric Machine Coils
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Solution Overview
Problem
Large electric machine generators, such as those in wind turbines, face challenges with coil winding arrangements that result in load imbalances and increased material costs due to varying coil lengths and resistances, leading to inefficient electrical performance and higher material usage.
Innovation Solution
A winding arrangement where each coil comprises an equal number of distinct winding types, with specific end geometries allowing for compact overlap and balanced phase layout, reducing material usage and electrical losses by ensuring all phases draw the same current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If windings are made with different geometries to permit compact overlap, then material usage is reduced, but coil lengths become different resulting in load imbalances
Solution Approach 1:
The stator is divided into multiple modular stator segments, each containing a balanced set of coils with equal lengths. This segmentation allows the generator to achieve overall compactness while maintaining load balance within each segment, resolving the contradiction between material reduction and load balance.
Solution Approach 2:
Different stator segments may have different winding geometries optimized for local space utilization, while each segment internally maintains balanced coil lengths. This local optimization approach allows material efficiency without compromising overall load balance.
2Power
If coil windings are made thick and heavy for large dimensions, then high currents can be handled, but material costs and weight increase
Solution Approach 1:
Multiple stator segments are nested or arranged in a modular configuration, allowing efficient space utilization. This nesting approach enables the generator to handle high currents through distributed windings while reducing overall material usage and weight compared to a single large winding structure.
3Loss of substance
If winding overhangs are kept short to reduce material costs, then material usage decreases, but manufacturing and assembly become more difficult
Solution Approach 1:
Coils are pre-assembled into complete stator segments with all connections made before installation. This preliminary assembly approach allows for precise control of coil lengths and connections, maintaining material efficiency while simplifying the overall manufacturing process by reducing on-site assembly complexity.
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 solution achieves balanced electrical performance by ensuring all phases have equal coil lengths, reducing material requirements, and minimizing electrical losses, thereby enhancing the overall efficiency and reducing the weight of the generator.
Implementation Method 1
the slots for the 'go' and 'return' sections of one particular winding of a coil enclose or flank a number of slots for the 'go' and 'return' sections of the remaining coils
Implementation Method 2
an electric current is passed through coils, usually of copper, inducing a magnetic field
Data Source
Figure 1
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Figure 4
AI summary
The invention describes a winding arrangement (1) for an armature (2) of an electric machine (4), which winding arrangement (1) comprises a plurality of coils (C1, C2, C3) and a plurality of distinct winding types (W1, W2, W3), wherein the coils (C1, C2, C3) are arranged on the armature (2) such that each coil (10, 20, 30) comprises the same number of windings (10, 20, 30) and the same number of each of the distinct winding types (W1, W2, W3). The invention further describes an armature (2) for a generator (4), comprising a plurality of coils (C1, C2, C3), wherein the coils (C1, C2, C3) are arranged on the armature (2) according to such a winding arrangement. The invention also describes a wind turbine (5) with a generator (4) comprising a rotor (3) and a stator (2), and wherein a plurality of coils (C1, C2, C3) is arranged on the stator (2) according to such a winding arrangement.