Delta-Connected Stator Winding Layout for Thinner Motor Assembly
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Solution Overview
Problem
The delta connection stator in three-phase rotating electrical machines faces challenges in assembly and insulation due to overlapping crossover wires, which complicates manufacturing and increases thickness, making it difficult to meet device downsizing demands.
Innovation Solution
The winding direction of the second phase coil is reversed, with crossover wires for the first and third phase coils arranged on one side and the second phase coil's crossover wire on the opposite side, reducing interference and maintaining insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If all phase coils are wound in the same direction, then the winding process is simple and consistent, but the contact points become physically separated and assembly becomes difficult
Solution Approach 1:
The patent applies inversion by winding the middle phase coil (V-phase) in the opposite direction compared to the other two phases. This reverses the normal winding pattern to achieve a specific outcome: the crossover wires for all three phases converge at the same location, making contact points easily accessible for assembly while maintaining systematic winding processes.
2Device complexity
If crossover wires are arranged on the same surface, then the wiring structure is simple, but the wires overlap and increase the stator thickness
Solution Approach 1:
The patent transitions from a two-dimensional planar arrangement to a three-dimensional spatial arrangement by routing crossover wires through different surfaces of the stator. Specifically, the first and third phase crossover wires are arranged on one surface while the second phase crossover wire is arranged on the opposite surface, eliminating overlaps and reducing stator thickness.
3Area of stationary object
If crossover wires are placed densely together, then the wiring path is compact, but the location thickness increases and device downsizing demands are not met
Solution Approach 1:
The patent utilizes the third dimension (depth/surface orientation) to distribute crossover wires that would otherwise overlap in the two-dimensional plane. By placing wires on opposite surfaces of the stator, the patent achieves compact wiring path area while eliminating thickness increases at any single location.
4Reliability
If wiring is performed with caution at dense crossover wire locations, then insulation may be maintained, but the wiring process becomes difficult and time-consuming
Solution Approach 1:
The patent eliminates the need for cautious wiring at dense locations by distributing crossover wires across different surfaces. This spatial separation removes the complexity and time consumption associated with careful wiring operations while maintaining reliable insulation through the inherent physical separation of wires.
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 configuration facilitates easy assembly and maintains high insulation for copper wires, reducing the thickness of the stator and enhancing manufacturing efficiency.
Implementation Method 1
a rotor having permanent magnets arranged to have different magnetism along the circumference
Implementation Method 2
three-phase rotating electrical machine utilizing a delta connection
Data Source
AI summary
A rotating electrical machine may include a stator and a rotor. The stator may include a plurality of iron cores and a plurality of windings. The plurality of windings may include a first phase winding, a second phase winding, and a third phase winding connected in a delta connection. The first phase winding, the second phase winding, and the third phase winding may each be connected in series with a respective crossover wire. The first and third phase windings may be wound in a first winding direction. The second phase winding may be wound in a second winding direction. A first crossover wire connecting the first phase winding and/or a third crossover wire connecting the third phase winding may be arranged on a first side of the stator. A second crossover wire connecting the second phase winding may be arranged on a second side of the stator.