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pull-out_torque [2019/06/03 18:30]
pull-out_torque [2020/07/02 22:35] (current)
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 +====== Pull-out torque ======
 +
 +|< 100% >|
 +| //[[user/Stan Zurek]], Pull-out torque, [[http://Encyclopedia-Magnetica.com|Encyclopedia-Magnetica.com]], {accessed @YEAR@-@MONTH@-@DAY@}// |
 +| //[[/wiki/reviewed]] by [[user/Jeanete Leicht]], 2013-02-05// |
 +
 +<box 30% right #f0f0f0>
 +Pull-out torque for a [[synchronous motor]][([[http://www.bodine-electric.com/techtools/?context=1|Small motor, Gearmotor and Control Handbook, Bodine Electric Company, 5th edition, ISBN 9994675133, Chapter 2, AC Gearmotors and motors, p. 2-14, {accessed 19 Nov 2012}]])]
 +[[file/pull_in_out_torque_magnetica.png|{{pull_in_out_torque_magnetica.png}}]]
 +{{page>insert/by_SZ}}
 +</box>
 +
 +**Pull-out torque** or **breakdown torque**[([[http://www.motorsanddrives.com/cowern/motorterms.html]], {accessed 19 Nov 2012})] - a point on the [[torque curve]] of [[electric motors]], with slightly different meaning for a [[synchronous motor]] and an [[induction motor]].
 +
 +===== Synchronous motors =====
 +In synchronous motors the value of **pull-out torque** is a maximum value of [[torque]] which allows a [[synchronous motor]] to remain in synchronism without "pulling out" of step or [[synchronism]]. 
 +
 +The value of pull-out torque is always higher than value of [[pull-in torque]] and can be between 1.25 - 3.5 of the [[nominal]] full-load torque.[([[http://google.com/books?isbn=8170080886|S.S. Gupta, Electrical Engineering: Objective Type, Laxmi Publications, 2007, ISBN 81-7008-088-6, p. 508]])]
 +
 +Typically, during normal operation the torque of the load should not exceed the value of the pull-out torque.
 +
 +<WRAP clear></WRAP>
 +<box 30% right #f0f0f0>
 +Breakdown torque for an [[induction motor]][([[https://eb.automation.siemens.com/goos/catalog/Pages/ProductData.aspx?nodeID=10139264&language=en&regionUrl=/#activetab=product&|SIMOTICS N-compact Non-Standard Motors, {accessed 21 Nov 2012}]])][(Doty)]
 +[[file/starting_pull-up_break-down_torque_magnetica.png|{{starting_pull-up_break-down_torque_magnetica.png}}]]
 +{{page>insert/by_SZ}}
 +</box>
 +
 +===== Induction motors =====
 +For induction or asynchronous motors the value of breakdown torque is usually synonymous with the peak value on the torque curve.[(Doty>[[http://google.com/books?isbn=9781420088700|Steve Doty, Wayne C. Turner, Energy Management Handbook, 7th edition, The Fairmont Press, 2009, ISBN 978-1-4200-8870-0, p. 280]])] 
 +
 +If the load torque is greater than the pull-out torque then such motor will slow down significantly and if the load torque is not reduced it will [[stall]].
 +
 +===== See also =====
 +  *[[Pull-in torque]]
 +  *[[Pull-up torque]]
 +  *[[Stall torque]]
 +  *[[Starting torque]]
 +
 +===== References =====
 +~~REFNOTES~~
 +
 +{{tag>Torque_curves Synchronous_motors Induction_motors Counter}}
  

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