Stator Wiring Reduces Torque Ripple in Electric Motors
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing rotating electric machines experience increased volume of wiring-related components on one axial end side of the stator core, leading to reduced wire turns in power supply lead wires, which results in torque ripple and unbalanced magnetic attraction, degrading the motor's characteristics.
Innovation Solution
The stator design includes an annular core body with coils connected in series across different phases, where the leading coil's wire end is connected to the power line and the last coil's wire end is connected to a neutral point via a second wiring section that extends along a portion with fewer turns, reducing torque ripple and unbalanced magnetic attraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the power supply lead wires and three-phase power supply parts are arranged on one axial end side while the neutral point lead wires and neutral point connection parts are arranged on the other axial end side, then the occupied volume of wiring-related components on one axial end side is reduced, but the number of turns of wire is partially reduced in each power supply lead wire, causing torque ripple and unbalanced magnetic attraction
Solution Approach 1:
The patent moves the neutral point connection part from the axial end side to the radial inner peripheral side of the stator core, changing the spatial dimension of the connection. This allows the neutral point lead wires to extend in the radial direction rather than axially, maintaining adequate wire turns while reducing axial end side volume occupation.
Solution Approach 2:
The patent segments the wiring arrangement by separating the power supply lead wire connections (on the axial end side) from the neutral point connections (on the radial inner peripheral side). This segmentation allows independent optimization of each connection type's spatial arrangement, resolving the contradiction between volume reduction and performance maintenance.
2Device complexity
If all coils of each phase are connected on one axial end side of the stator core, then the wiring arrangement is simplified, but the occupied volume of wiring-related components on that axial end side increases
Solution Approach 1:
The patent distributes connections across different spatial dimensions: power supply lead wires connect on the axial end side while neutral point connections are made on the radial inner peripheral side. This multi-dimensional arrangement reduces concentration of wiring components on any single location, decreasing occupied volume while maintaining manageable 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 configuration reduces the likelihood of torque ripple and unbalanced magnetic attraction, thereby suppressing the deterioration of electric motor characteristics.
Implementation Method 1
The three-phase motor includes U-phase, V-phase and W-phase coils provided on a stator core, and power lines for supplying current to the coils
Data Source
AI summary
A stator includes: a first wiring section connecting a coil wire end of a leading coil to a power line; and a second wiring section connecting a coil wire end of a last coil to a neutral point located on the power line side, by wiring that extends along a fewer-turns portion of the leading coil that has a smaller number of turns of wire than the last coil.