10-Pole 12-Slot PMSM Stator Tooth Width Optimization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional 10-pole 12-slot permanent magnet synchronous motors experience uneven iron losses in adjacent teeth due to differences in tooth widths, which affects motor efficiency and torque generation.
Innovation Solution
A stator core design with an annular yoke and teeth arranged at equal intervals, where each tooth group consists of a narrower first tooth and a wider second tooth, with coils wound around both, optimizing the winding portion widths to reduce iron losses and copper losses by adjusting the circumferential coil length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If teeth are arranged with equal widths in a 10-pole 12-slot permanent magnet synchronous motor, then the structure is simple and manufacturing is easy, but iron losses are uneven in adjacent teeth forming the same phase, reducing motor efficiency
Solution Approach 1:
The patent applies local quality by making the second tooth wider than the first tooth in each tooth group. This local structural variation compensates for the uneven iron losses that occur in adjacent teeth forming the same phase, where the tooth located behind along the rotor rotational direction experiences higher iron loss. By increasing the width of the second tooth, the magnetic flux distribution is optimized to reduce the iron loss imbalance, thereby improving motor efficiency while maintaining a relatively simple manufacturing process.
2Loss of energy
If coils are wound around teeth with different widths, then iron losses are reduced and motor efficiency is improved, but the device complexity increases
Solution Approach 1:
The patent applies asymmetry by introducing different widths for the first and second teeth in each tooth group. Specifically, the second tooth is designed to be wider than the first tooth. This asymmetric configuration optimizes the magnetic flux distribution across the stator, reducing uneven iron losses in adjacent teeth that form the same phase. The asymmetric design is implemented in a controlled manner with only specific teeth having different widths, thereby achieving iron loss reduction while limiting the increase in device complexity.
3Loss of energy
If the circumferential coil length is reduced by optimizing tooth widths, then copper losses are reduced and motor efficiency is improved, but the coil winding complexity increases
Solution Approach 1:
The patent applies local quality by optimizing the width of specific teeth (the second tooth being wider than the first) to reduce the circumferential coil length. This localized structural optimization allows for shorter coil windings in certain regions, thereby reducing copper losses and improving motor efficiency. The coil winding configuration is adapted to the varying tooth widths, with the wider second tooth providing space for optimized coil placement that reduces the overall circumferential length of the coils while maintaining manageable winding 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 enhances motor efficiency by reducing iron and copper losses, improving torque generation, and lowering production costs by optimizing coil usage and reducing the circumferential coil length.
Implementation Method 1
a plurality of permanent magnets 2b arranged on an outer edge of the rotor core 2a in a radial direction of the rotor 2, and a stator 1 having an annular stator core 1a with an inner circumference facing the outer circumference of the rotor core 2a
Implementation Method 2
rotate a rotor using magnetic fields generated by permanent magnets provided on the rotor and magnetic fields generated by currents flowing through coils wound on a stator
Data Source
AI summary
A 10-pole 12-slot permanent magnet synchronous motor comprises a plurality of teeth. From among two adjacent teeth around which coils of the same phase are wound adjacent to each other, the rotational direction width of a winding portion of a first tooth placed in front along a rotational direction of a rotor is set narrower than that of a winding portion of a second tooth placed behind along the rotational direction of the rotor. With this configuration, the circumferential length of the coil wound around the first tooth can be shortened with suppressing increase in iron loss in the winding portion of the first tooth.