Efficiency Improvement Strategy for Multiple Operating Points in Doubly Fed Magnetic Geared Motor
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 unde...
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MDPI AG
2020-04-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/10/7/2456 |
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| author | Homin Shin Junghwan Chang |
| author_facet | Homin Shin Junghwan Chang |
| author_sort | Homin Shin |
| collection | DOAJ |
| description | 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. |
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| id | doaj.art-cb1848ea6b664465ba45d6df61ba9a1f |
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| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-10T20:42:22Z |
| publishDate | 2020-04-01 |
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| spelling | doaj.art-cb1848ea6b664465ba45d6df61ba9a1f2023-11-19T20:37:58ZengMDPI AGApplied Sciences2076-34172020-04-01107245610.3390/app10072456Efficiency Improvement Strategy for Multiple Operating Points in Doubly Fed Magnetic Geared MotorHomin Shin0Junghwan Chang1Mechatronics System Research Lab., Department of Electrical Engineering, Dong-A University, Saha-gu, Busan 49315, KoreaMechatronics System Research Lab., Department of Electrical Engineering, Dong-A University, Saha-gu, Busan 49315, KoreaThe 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.https://www.mdpi.com/2076-3417/10/7/2456coaxial magnetic geardoubly fed magnetic geared motorelectric vehicles (EVs)electric continuously variable transmission (E-CVT)magnetic geared machine |
| spellingShingle | Homin Shin Junghwan Chang Efficiency Improvement Strategy for Multiple Operating Points in Doubly Fed Magnetic Geared Motor Applied Sciences coaxial magnetic gear doubly fed magnetic geared motor electric vehicles (EVs) electric continuously variable transmission (E-CVT) magnetic geared machine |
| title | Efficiency Improvement Strategy for Multiple Operating Points in Doubly Fed Magnetic Geared Motor |
| title_full | Efficiency Improvement Strategy for Multiple Operating Points in Doubly Fed Magnetic Geared Motor |
| title_fullStr | Efficiency Improvement Strategy for Multiple Operating Points in Doubly Fed Magnetic Geared Motor |
| title_full_unstemmed | Efficiency Improvement Strategy for Multiple Operating Points in Doubly Fed Magnetic Geared Motor |
| title_short | Efficiency Improvement Strategy for Multiple Operating Points in Doubly Fed Magnetic Geared Motor |
| title_sort | efficiency improvement strategy for multiple operating points in doubly fed magnetic geared motor |
| topic | coaxial magnetic gear doubly fed magnetic geared motor electric vehicles (EVs) electric continuously variable transmission (E-CVT) magnetic geared machine |
| url | https://www.mdpi.com/2076-3417/10/7/2456 |
| work_keys_str_mv | AT hominshin efficiencyimprovementstrategyformultipleoperatingpointsindoublyfedmagneticgearedmotor AT junghwanchang efficiencyimprovementstrategyformultipleoperatingpointsindoublyfedmagneticgearedmotor |