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A '''dual-rotor permanent magnet induction motor''' ('''DRPMIM''') is a motor having two [[Rotor (electric)|rotors]] within the same motor housing. This rotor arrangement can increase [[power volume density]], efficiency, and reduce [[cogging torque]].<ref name="Diao2015">{{cite journal|last1=Diao|first1=Tongshan|title=Study on Dual-Rotor Permanent Magnet Induction Motor and Performance|journal=The Open Electrical & Electronic Engineering Journal|volume=9|issue=1|year=2015|pages=584–590|issn=1874-1290|doi=10.2174/1874129001509010584|doi-broken-date=2024-04-17 |doi-access=free}}</ref><ref name="HwangLee2019">{{cite journal|last1=Hwang|first1=Myeong-Hwan|last2=Lee|first2=Hae-Sol|last3=Yang|first3=Se-Hyeon|last4=Lee|first4=Gye-Seong|last5=Han|first5=Jong-Ho|last6=Kim|first6=Dong-Hyun|last7=Kim|first7=Hyeon-Woo|last8=Cha|first8=Hyun-Rok|title=Cogging Torque Reduction and Offset of Dual-Rotor Interior Permanent Magnet Motor in Electric Vehicle Traction Platforms|journal=Energies|volume=12|issue=9|year=2019|pages=1761|issn=1996-1073|doi=10.3390/en12091761|doi-access=free}}</ref> Some dual-rotor permanent magnet induction motors are a type of [[induction motor]]s, while others are not actually induction motors. |
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==Stator on the outside== |
==Stator on the outside== |
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In one arrangement, the motor has an ordinary induction motor stator. A squirrel-cage rotor connected to the output shaft rotates within the stator at slightly less than the rotating field from the stator. Within the squirrel-cage rotor is a freely rotating permanent magnet rotor, which is locked in with rotating field from the stator. The effect of the inner rotor is to reenforce the field from the stator.<ref name="Diao2015"/> |
In one arrangement, the motor has an ordinary induction motor stator. A [[squirrel-cage rotor]] connected to the output shaft rotates within the stator at slightly less than the rotating field from the stator. Within the squirrel-cage rotor is a freely rotating permanent magnet rotor, which is locked in with rotating field from the stator. The effect of the inner rotor is to reenforce the field from the stator.<ref name="Diao2015"/> |
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Because the stator slips behind the rotating magnetic field inducing a current in the rotor, this type of motor meets the definition of an induction motor. |
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<ref>{{cite web |title=IEC 60050 Section 411-31: Rotation Machinery - General |date=October 1990 |publisher=[[International Electrotechnical Commission]] |url=https://www.electropedia.org/iev/iev.nsf/display?openform&ievref=411-31-10 |accessdate=March 22, 2021}}</ref><ref>{{cite book |title=induction motor |publisher=[[HarperCollins]] |date=2021 |url=https://www.collinsdictionary.com/dictionary/english/induction-motor |accessdate=April 9, 2021}}</ref> |
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==Stator between rotors== |
==Stator between rotors== |
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[[File:Rotor for dual rotor motor.pdf|thumb|The inner rotor is in the center, surrounded by an empty space for the stator, which will be surrounded by the outer rotor]] |
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In another arrangement, one rotor is inside the stator with a second rotor on the outside of the stator.<ref name="HwangLee2019">{{cite journal|last1=Hwang|first1=Myeong-Hwan|last2=Lee|first2=Hae-Sol|last3=Yang|first3=Se-Hyeon|last4=Lee|first4=Gye-Seong|last5=Han|first5=Jong-Ho|last6=Kim|first6=Dong-Hyun|last7=Kim|first7=Hyeon-Woo|last8=Cha|first8=Hyun-Rok|title=Cogging Torque Reduction and Offset of Dual-Rotor Interior Permanent Magnet Motor in Electric Vehicle Traction Platforms|journal=Energies|volume=12|issue=9|year=2019|pages=1761|issn=1996-1073|doi=10.3390/en12091761}}</ref> |
In another arrangement, one rotor is inside the stator with a second rotor on the outside of the stator.<ref name="HwangLee2019">{{cite journal|last1=Hwang|first1=Myeong-Hwan|last2=Lee|first2=Hae-Sol|last3=Yang|first3=Se-Hyeon|last4=Lee|first4=Gye-Seong|last5=Han|first5=Jong-Ho|last6=Kim|first6=Dong-Hyun|last7=Kim|first7=Hyeon-Woo|last8=Cha|first8=Hyun-Rok|title=Cogging Torque Reduction and Offset of Dual-Rotor Interior Permanent Magnet Motor in Electric Vehicle Traction Platforms|journal=Energies|volume=12|issue=9|year=2019|pages=1761|issn=1996-1073|doi=10.3390/en12091761|doi-access=free}}</ref> The photo labelled FIG. 8 is from a patent application. It shows two rotors assembled into a single unit, with six permanent magnets attached to the outer surface of the inner rotor, and six to the inner surface of the outer rotor.<ref>{{cite patent |country=US |number=6924574B2 |title=Dual-rotor, radial-flux, toroidally-wound, permanent-magnet machine |fdate=2003-05-30 |pridate=2003-05-30 |assign=[[Wisconsin Alumni Research Foundation]] |url=https://patents.google.com/patent/US6924574B2/en accessdate=March 14, 2021}}</ref> |
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==Applications== |
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Because of their greater power density dual-rotor permanent magnet induction motors are being considered for use in electric vehicles. |
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==References== |
==References== |
This article needs additional citations for verification. Please help improve this articlebyadding citations to reliable sources. Unsourced material may be challenged and removed.
Find sources: "Dual-rotor permanent magnet induction motor" – news · newspapers · books · scholar · JSTOR (March 2021) (Learn how and when to remove this message) |
Adual-rotor permanent magnet induction motor (DRPMIM) is a motor having two rotors within the same motor housing. This rotor arrangement can increase power volume density, efficiency, and reduce cogging torque.[1][2] Some dual-rotor permanent magnet induction motors are a type of induction motors, while others are not actually induction motors.
In one arrangement, the motor has an ordinary induction motor stator. A squirrel-cage rotor connected to the output shaft rotates within the stator at slightly less than the rotating field from the stator. Within the squirrel-cage rotor is a freely rotating permanent magnet rotor, which is locked in with rotating field from the stator. The effect of the inner rotor is to reenforce the field from the stator.[1] Because the stator slips behind the rotating magnetic field inducing a current in the rotor, this type of motor meets the definition of an induction motor. [3][4]
In another arrangement, one rotor is inside the stator with a second rotor on the outside of the stator.[2] The photo labelled FIG. 8 is from a patent application. It shows two rotors assembled into a single unit, with six permanent magnets attached to the outer surface of the inner rotor, and six to the inner surface of the outer rotor.[5]
{{cite journal}}
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