Coiled Stator Asymmetric Winding Wire Reduction
Solution Overview
Problem
Existing rotating electrical machine stators with windings face challenges in optimizing performance due to inefficiencies in wire usage and weight, leading to increased costs and reduced efficiency.
Innovation Solution
The stator design features a winding with two half-phases where the number of turns and wire length are unbalanced, with one half-phase having fewer turns and shorter wire length than the other, allowing for reduced total wire length, weight, and production costs while maintaining electromagnetic performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the number of turns and wire length are balanced between half-phases, then the winding arrangement is optimized, but the total wire length and weight are increased
Solution Approach 1:
The patent applies asymmetry by deliberately creating an unbalanced distribution of turns between half-phases. Specifically, one half-phase has fewer turns with shorter wire length while the other half-phase has more turns with longer wire length. This asymmetric configuration reduces the total wire length and weight while maintaining electromagnetic performance through compensating design parameters.
Solution Approach 2:
The patent changes the parameter distribution between half-phases by varying the number of turns and wire length. Instead of maintaining equal parameters, the invention optimizes electromagnetic performance by adjusting these parameters asymmetrically, allowing one half-phase to have fewer turns with shorter wire while the other has more turns with longer wire, thereby reducing overall material usage.
2Weight of stationary object
If the wire length is reduced in one half-phase, then the weight and cost are reduced, but the winding balance is disrupted
Solution Approach 1:
The patent deliberately introduces asymmetry in the winding configuration where one half-phase has fewer turns and shorter wire length compared to the other half-phase. This asymmetric design reduces the total wire length and stator weight while managing the increased complexity through systematic parameter optimization.
Solution Approach 2:
The patent applies local quality by allowing different regions (half-phases) of the winding to have different characteristics. Specifically, one half-phase is designed with fewer turns and shorter wire length tailored to local requirements, while the other half-phase has more turns with longer wire length, optimizing the overall stator performance through localized parameter variation.
3Loss of substance
If unbalanced turns distribution is used, then the total wire length is reduced, but the electromagnetic performance may be compromised
Solution Approach 1:
The patent optimizes parameter distribution by changing the number of turns and wire length in each half-phase. Instead of using balanced parameters, the invention adjusts these parameters asymmetrically to reduce wire material usage while maintaining electromagnetic performance through compensating design in the other half-phase.
Solution Approach 2:
The patent uses asymmetric parameter distribution where one half-phase has fewer turns with shorter wire length, reducing total wire material, while the other half-phase compensates with more turns and longer wire length to maintain overall electromagnetic 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 design reduces wire resistance and weight, improving overall performance by allowing for a more compact and efficient winding configuration without compromising electromagnetic performance.
Implementation Method 1
In alternator mode, when the rotor is rotating, it induces a magnetic field in the stator which transforms it into electric current
Implementation Method 2
In motor mode, the stator is electrically powered and induces a magnetic field driving the rotor in rotation
Data Source
Figure 1
Figure 2
Figure 3~5
AI summary
The invention proposes a stator for a rotating electric machine, in particular for a motor vehicle, the stator (15) including: - a body (27) including notches (37) that are opened radially into an internal wall (40) of said body, - at least one winding (43) forming a phase of the stator, the winding formed from turns (54) includes a first half-phase (49) and a second half-phase (50) that are superposed radially in the notch (37), each turn including a series of axial strands (44) that are received in a series of associated notches and connecting strands (45, 46) that connect the successive axial strands (44) by extending alternatively to protrude with respect to the body (27). A length of wire of each turn of one of the half-phases is larger than the length of wire of each turn of the other half-phase. Furthermore, one of the half-phases has a number of turns higher than that of the other half-phase.