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Applications of Magnetic Gear and Magnetic Geared Motor

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Mechanical Engineering".

Deadline for manuscript submissions: closed (15 July 2020) | Viewed by 3145

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Electrical Engineering Department, Donga University, Saha-gu, Busan 49315, Republic of Korea
Interests: electric machines; actuators; special machine
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Special Issue Information

Dear Colleagues,

Magnetic gear has been researched since the early 20th century, and it has been designed through the imitated structure with the conventional mechanical gear as the counterparts. However, after introducing coaxial type magnetic gear, research on the magnetic gear and its applications has expanded tremendously. With the inherent advantages of magnetic gear such as its reliability, maintenance period and cost, vibration and noise, and inherent overload protection, it has attracted attention in the fields of renewable energy systems, marine energy or propulsion applications, aerospace technology, the defense industry, automotive applications, etc. Especially in recent years, the magnetic geared motor has emerged as a major interest in automotive applications, including full electric vehicles, hybrid vehicles, electric bikes, and personal mobility.

Considering the consistent increase in interest by the research community and industry on magnetic gear, this Special Issue on “Applications of Magnetic Gear and Magnetic Geared Machines” aims to cover practical issues related to the design and manufacturing of the magnetic gear and geared machines.

The topics of interest for this Special Issue include but are not limited to:

  1. Design and electromagnetic field analysis via the finite element method or analytical method;
  2. Coupled problems such as electromagnetic–thermal coupling problems, dynamic characteristics analysis, vibration and noise problems, and relevant multiphysics studies;
  3. Application of magnetic gear and geared machines in renewable energy, traction, and propulsion;
  4. Novel and innovative designs considering the field of applications;
  5. Other relevant research with innovative techniques, high-quality, and advanced contents of practical merit.

Prof. Junghwan Chang
Guest Editor

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Keywords

  • magnetic gear
  • magnetic geared machine
  • gearing effect
  • magnetic field modulation
  • electric vehicle
  • traction motor
  • power transmission
  • propulsion system

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Published Papers (1 paper)

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Research

12 pages, 3065 KiB  
Article
Efficiency Improvement Strategy for Multiple Operating Points in Doubly Fed Magnetic Geared Motor
by Homin Shin and Junghwan Chang
Appl. Sci. 2020, 10(7), 2456; https://doi.org/10.3390/app10072456 - 3 Apr 2020
Cited by 1 | Viewed by 1909
Abstract
The doubly fed magnetic geared motor, which has dual AC windings, can be operated with different frequencies in the inner and outer windings. However, the inner and outer windings have different numbers of pole pairs to meet the pole combination derived by the [...] Read more.
The doubly fed magnetic geared motor, which has dual AC windings, can be operated with different frequencies in the inner and outer windings. However, the inner and outer windings have different numbers of pole pairs to meet the pole combination derived by the magnetic gearing effect, and hence undesirable space harmonic components of the magnetic flux are produced at the air gaps. These space harmonics affect the iron losses at each core, and the resultant iron loss and efficiency are varied by the frequencies of the inner and outer windings. Thus, in this paper, first, the effect of the space harmonic components of the air gap magnetic flux density in the inner stator, outer stator, and the modulating pieces is separately investigated. In addition, the iron loss characteristics of each ferromagnetic material are presented according to the frequency combinations in the inner and outer windings. Secondly, the iron loss maps and the efficiency maps according to the frequency conditions of the inner and outer windings are drawn, and the causes of the characteristic differences in each map are analyzed. Thirdly, the frequency control sequence and the roles of the inner and outer windings as the armature and field parts are changed, and the analysis of the iron loss map and efficiency map is repeated. Finally, the results in the inner-armature case and the outer-armature case are compared with each other, and the possibility of improving the overall operating efficiency over the multiple operating points by using the individual frequency control and frequency combination selection is proved. Full article
(This article belongs to the Special Issue Applications of Magnetic Gear and Magnetic Geared Motor)
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