Three-Phase Permanent Magnet Motor Wiring Topology
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Solution Overview
Problem
Conventional three-phase permanent magnet type motors with multilayer wiring boards face increased manufacturing costs and issues with rotor eccentricity and speed fluctuation due to thick wire diameters and high torque ripple, which are exacerbated by the need for multiple layers in the wiring configuration.
Innovation Solution
A three-phase permanent magnet type motor design where adjacent in-phase windings are connected in parallel and in series with symmetrical in-phase windings, featuring a multilayer wiring board configuration with a reduced number of layers, allowing for a line symmetrical in-phase transition wiring pattern, thereby reducing electromagnetic force and torque ripple while lowering manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If multilayer printed wiring boards of five layers or more are used for two parallel connection, then the winding can be connected, but the manufacturing cost increases
Solution Approach 1:
The patent divides the winding connection into two independent circuits: a first circuit connecting adjacent in-phase windings in parallel, and a second circuit connecting symmetrical in-phase windings in series. This segmentation allows the use of a simplified four-layer wiring board structure instead of five layers or more, reducing manufacturing cost while maintaining functional completeness
Solution Approach 2:
The patent utilizes the layer dimension of the wiring board efficiently by arranging the first circuit on one layer and the second circuit on another layer, with interlayer connections established through via holes. This dimensional arrangement enables complex winding connections to be achieved with only four layers, avoiding the need for five or more layers
2Reliability
If multilayer printed wiring boards of series connection are used to reduce rotor eccentric force and speed fluctuation, then electromagnetic balance improves, but the electric wire diameter becomes thicker and space factor decreases
Solution Approach 1:
The patent applies different connection topologies to different winding groups: adjacent in-phase windings are connected in parallel (increasing current capacity and reducing wire diameter requirements), while symmetrical in-phase windings are connected in series (balancing electromagnetic forces). This localized application of different connection qualities achieves both reliability improvement and space optimization
Solution Approach 2:
The patent creates an asymmetric connection structure where the first circuit (parallel connection of adjacent windings) and second circuit (series connection of symmetrical windings) have different topological characteristics. This asymmetric arrangement allows optimization of both electromagnetic balance and wire space utilization, avoiding the uniform connection approaches that lead to thicker wires
3Reliability
If adjacent in-phase windings are connected in parallel and connected to facing symmetrical in-phase winding in series, then rotor eccentricity and torque ripple are reduced, but workability worsens and manufacturing cost increases
Solution Approach 1:
The patent merges the first circuit (parallel connection) and second circuit (series connection) into a unified four-layer wiring board structure, where the circuits share common terminals and interlayer connection points. This merging eliminates redundant wiring layers and simplifies the manufacturing process, improving workability while maintaining the torque ripple reduction benefits
Solution Approach 2:
The wiring board structure is designed to serve multiple functions simultaneously: the first circuit provides parallel connection for current distribution, the second circuit provides series connection for electromagnetic balancing, and the four-layer structure itself provides mechanical support and electrical insulation. This multi-functionality reduces the need for separate components and simplifies manufacturing
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 effectively reduces rotor eccentricity and torque ripple, improves workability, and decreases the number of layers in the multilayer wiring board, resulting in lower manufacturing costs and enhanced motor efficiency with a thin wire diameter.
Implementation Method 1
a first circuit in which adjacent in-phase windings are connected in parallel, and a second circuit in which symmetrical in-phase windings are connected in series
Data Source
AI summary
A three-phase permanent magnet type motor has a stator in which a plurality of windings wound in a same direction are disposed, and the number of slots is 12n; a rotor in which the number of poles of the permanent magnet is 10n or 14n; and multilayer wiring boards for performing the connection so as to be 2m parallel. The three-phase permanent magnet type motor has a circuit configuration in which, among U-phase, V-phase, and W-phase, adjacent in-phase windings are connected in parallel and are connected in series with a like-pole winding of a symmetrical in-phase second winding group facing at 6-slot pitch angle, when a center of a first winding group of the adjacent in-phase windings is set as a reference axis, and in-phase transition wiring patterns are disposed on the same layer of the multilayer wiring boards in a line symmetrical manner.