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starting_torque [2019/06/03 18:30]
starting_torque [2020/07/09 00:10] (current)
stan_zurek
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 +====== Starting torque ======
 +
 +|< 100% >|
 +| //[[user/Stan Zurek]], Starting torque, [[http://Encyclopedia-Magnetica.com|Encyclopedia-Magnetica.com]], {accessed @YEAR@-@MONTH@-@DAY@}// |
 +| //[[/wiki/reviewed]] by [[user/Jeanete Leicht]], 2013-02-05// |
 +
 +**Starting torque**, **break away torque** or **locked-rotor torque**[(Siemens)] - such a value of [[torque]] which allows an [[electric motor]] to accelerate the load, from the condition of stationary [[rotor]] ([[locked rotor]]).[([[http://google.com/books?isbn=8170080886|S.S. Gupta, Electrical Engineering: Objective Type, Laxmi Publications, 2007, ISBN 81-7008-088-6, p. 507]])]
 +
 +The break away torque is significant especially for machines, which start with some load present, for instance motors driving mixers or pumps. 
 +
 +{{page>insert/paypal}}
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 +<box 40% right #f0f0f0>
 +Starting, break away or locked-rotor torque[(Siemens>[[https://eb.automation.siemens.com/goos/catalog/Pages/ProductData.aspx?nodeID=10139264&language=en&regionUrl=/#activetab=product&|https://eb.automation.siemens.com / SIMOTICS N-compact Non-Standard Motors, {accessed 21 Nov 2012}]])]
 +[[file/starting_or_break_away_torque_magnetica.png|{{starting_or_break_away_torque_magnetica.png}}]]
 +{{page>insert/by_SZ}}
 +</box>
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 +Sometimes, the [[torque curve]], from stationary to nominal speed, is referred to as [[starting torque curve]].[([[http://google.com/books?isbn=1856173461|Gebrüder Sulzer Aktiengesellschaft. Sulzer Pumps Ltd, Sulzer centrifugal pump handbook: Sulzer pumps, 2nd edition, Elsevier, 1998, ISBN 1-85617-346-1, p. 62]])]
 +
 +Ordinary [[synchronous motor]]s have zero starting torque. But with appropriate modification of the construction they might be designed to develop some starting torque, for instance by building in an auxiliary [[squirrel cage]] into the rotor.
 +
 +[[Wound-rotor motor|Wound-rotor motor]] can have higher starting torque than the nominal operating torque.
 +
 +===== See also =====
 +  *[[Pull-in torque]]
 +  *[[Pull-out torque]]
 +  *[[Pull-up torque]]
 +  *[[Stall torque]]
 +
 +===== References =====
 +~~REFNOTES~~
 +
 +{{tag>Electric_motors Counter}}
  

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