Analysis of a Novel Magnetic-Geared Dual-Rotor Motor With Complementary Structure

• Published in: IEEE transactions on industrial electronics (1982) Vol. 62; no. 11; pp. 6737 - 6747
• Main Authors: Sun, Le, Cheng, Ming, Jia, Hongyun
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.11.2015; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Cogging; cogging torque; complementary structure; Couplings; Design engineering; Devices; Finite element method; Forging; hybrid electric vehicle; Magnetic fields; Magnetic-geared dual-rotor motor; Motors; Power splitters; Ripples; Rotors; Stator windings; Torque; torque ripple; Windings; Cogging torque; hybrid electric vehicle (HEV); magnetic-geared dual-rotor motor (MGDRM); complementary structure; torque ripple
• DOI: 10.1109/TIE.2015.2437361
• ISSN: 0278-0046

A permanent-magnet dual-rotor motor is particularly suitable for constructing the power split device in hybrid electric vehicle application. This paper proposes a new magnetic-geared dual-rotor motor (MGDRM) design with complementary structure, in which both the inner and outer rotors are divided into three modules with a proper angular displacement for each other along the axis direction. This complementary design makes the flux linkage symmetrical and total cogging torque significantly reduced, without impairing the torque production. A simplified magnetic circuit model is developed to illustrate the complementary principle. By finite-element analysis (FEA), the effectiveness of such complementary structure is verified through the comparison with the conventional design. A prototype motor has been manufactured, and experiments have been carried out. Both FEA and experiments show that this new MGDRM offers symmetrical back-EMF waveforms, smaller cogging torque, and lower torque ripple.