A Novel Intersect Consequent Pole IPMSM Incorporating Rotor Gap and 3-D MEC for Magnet Reduction and Performance Improvement

Unofficial AI-generated summary based on the public title and abstract. Not an official translation.

🔬研究者:This paper presents a novel motor topology with validated performance, useful for researchers in electric machine design and optimization.

🏢実務担当者:Motor manufacturers can adopt this design to reduce rare-earth magnet costs and improve efficiency in applications like EVs and industrial drives.

🏛政策担当者:Policymakers focused on energy efficiency standards and critical material supply chains should note this technology as a pathway to reduce dependence on rare-earth magnets.

電動機は世界の電力使用量のおよそ35～40%を占めており、効率改善はエネルギー消費とCO2排出削減に不可欠である。希土類永久磁石はコンパクトで高性能な設計を可能にするが、高コストとサプライチェーンの脆弱性という課題に直面しており、磁石削減構造に関する研究を動機づけている。候補の一つはconsequent-poleトポロジーであり、これは磁石使用量を大幅に削減するが、逆起電力の歪み、トルク脈動、減磁の懸念を引き起こす非対称な磁界を本質的に抱えている。これらの欠点に対処するため、本研究ではN極とS極を軸方向に対称に配置したインターセクト型ロータ構成を導入する。この構成は磁気バランスを改善し、トルクリップルとコギングを抑制する一方で、平均トルクを低減し渦電流損を増加させる軸方向漏れ磁束を導入する。そのため、専用のロータギャップ設計と三次元磁気等価回路モデルを開発し、フル3次元有限要素解析と比較して計算負荷を大幅に削減しつつ、軸方向磁束経路を正確に捉える。磁石形状の最適化、減磁評価、損失評価を実施し、その後V字型プロトタイプの製作と試験を行う。提案構成は、従来設計と同じ出力特性を維持しながら、磁石材料を31.8%削減し、コギングトルクを51.3%低減し、トルクリップルを3.41%pt低減し、高効率かつ費用対効果の高い代替案としての可能性を示す。なお、今回、Ensys電磁界解析プログラムを使用した。

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Electric machines account for roughly 35–40% of global electricity use, making efficiency improvements essential for reducing energy consumption and CO2 emissions. Rare-earth permanent magnets enable compact and high-performance designs but face issues of high cost and supply-chain vulnerability, motivating research on magnet-saving structures. One candidate is the consequent-pole topology, which significantly lowers magnet usage but inherently suffers from asymmetric magnetic fields that cause back-EMF distortion, torque pulsation, and demagnetization concerns. To address these drawbacks, this study introduces an intersect-type rotor configuration in which N and S poles are arranged symmetrically along the axial direction. While this configuration improves magnetic balance and suppresses torque ripple and cogging, it introduces axial leakage that reduces average torque and increases eddy-current losses. A dedicated rotor-gap design and a three-dimensional magnetic equivalent-circuit model are therefore developed to accurately capture axial flux paths with drastically lower computational burden compared to full 3-D finite-element analysis. Optimization of magnet geometry, demagnetization assessment, and loss evaluation are performed, followed by fabrication and testing of a V-shaped prototype. The proposed configuration achieves a 31.8% reduction in magnet material, a 51.3% decrease in cogging torque, and a 3.41%p reduction in torque ripple while maintaining the same output characteristics as a conventional design, demonstrating its potential as a high-efficiency and cost-effective alternative. At this time, the Ensys electromagnetic analysis program was used.

• semanticscholar https://doi.org/10.1109/access.2025.3645261first seen 2026-05-05 22:18:38 · last seen 2026-08-11 04:56:56