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outer_rotor [2019/06/03 18:30]
outer_rotor [2020/07/19 01:35] (current)
stan_zurek
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 +====== Outer rotor ======
 +
 +|< 100% >|
 +| //[[user/Stan Zurek]], Outer rotor, [[http://Encyclopedia-Magnetica.com|Encyclopedia-Magnetica.com]], {accessed @YEAR@-@MONTH@-@DAY@}// |
 +| //[[/wiki/reviewed]] by [[user/Jeanete Leicht]], 2013-01-22// |
 +
 +===== Definition =====
 +
 +**Outer rotor**[([[http://google.com/books?isbn=9781607506034|SÅ‚awormi Wiak, Ewa Napieralska-Juszczak, Computer Field Models of Electromagnetic Devices, IOS Press, 2010, ISBN 9781607506034, p. 309]])] or **rotating stator**[(Stridsberg>[[http://google.com/patents/US5751089|Lennart Stridsberg, Brushless DC motors/generators, Patent US5751089, 1998]])], or **moving stator**[(Stridsberg)]
 +- a part of an [[electric motor]] or [[generator]], which looks similarly to an ordinary [[stator]], but is designed to rotate and performs the function of the [[rotor]]. 
 +
 +For instance, in an [[induction motor]] the stator envelopes the rotor, which revolves inside. No electrical connections are needed to the rotor, but they can be made conveniently to the stator, which does not move.
 +
 +{{page>insert/paypal}}
 +
 +<box 30% right #f0f0f0>
 +[[Inner stator]] (S) and outer rotor (R)[([[http://google.com/patents/US20050113216|Wei Cheng, Belt drive system with outer rotor motor, Patent US20050113216, 2004]])]
 +[[file/outer_rotor_and_inner_stator_patent_magnetica.png|{{outer_rotor_and_inner_stator_patent_magnetica.png}}]]
 +//<sup>USPTO, Public domain</sup>//
 +</box>
 +
 +However, in some applications it is more advantageous to have the outer part rotating, and the inner part stationary. Such construction is used for instance for [[direct drive]] of conveyor belts. The outer part is designed to have the belt placed directly on it.
 +
 +This concept is also used in some [[permanent magnet generator|permanent magnet generators]] for [[wind turbine|wind turbines]]. The electrical [[winding|windings]] and connections are made on the stationary inner part. The outer part is equipped with permanent magnets, whose rotation generates voltage in the stationary winding on the inner stator. The outer part also gives the possibility of mounting the turbine blades on it.
 +
 +The difference between the two names is that "//outer rotor//" refers to the mechanical function of the part, whereas "//rotating stator//" to the appearance (the part is located outside and looks similarly to a stator in an ordinary machine).
 +
 +<box 30% left #f0f0f0>
 +Outer rotor
 +[[file/outer_rotor_pm_generator_magnetica.jpg|{{outer_rotor_pm_generator_magnetica.jpg}}]]
 +{{page>insert/by_SZ}}
 +</box>
 +<box 30% left #f0f0f0>
 +[[Inner stator]]
 +[[file/inner_stator_pm_generator_magnetica.jpg|{{inner_stator_pm_generator_magnetica.jpg}}]]
 +{{page>insert/by_SZ}}
 +</box>
 +<box 30% left #f0f0f0>
 +[[Inner stator]]
 +[[file/inner_stator_pm_generator_2_magnetica.jpg|{{inner_stator_pm_generator_2_magnetica.jpg}}]]
 +{{page>insert/by_SZ}}
 +</box>
 +<WRAP clear></WRAP>
 +<box 30% left #f0f0f0>
 +[[Inner stator]], with [[wave winding]] visible
 +[[file/inner_stator_pm_generator_close_up_magnetica.jpg|{{inner_stator_pm_generator_close_up_magnetica.jpg}}]]
 +{{page>insert/by_SZ}}
 +</box>
 +
 +
 +===== See also =====
 +   *[[Inner stator]]
 +
 +===== References =====
 +~~REFNOTES~~
 +
 +{{tag>Rotating_machines Generators Rotors Stators Counter}}
  

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