User Tools

Site Tools



This shows you the differences between two versions of the page.

Link to this comparison view

Both sides previous revision Previous revision
Previous revision
starting_torque [2019/06/03 18:30]
starting_torque [2020/07/09 00:10] (current)
Line 1: Line 1:
 +====== Starting torque ======
 +|< 100% >|
 +| //[[user/Stan Zurek]], Starting torque, [[|]], {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]]).[([[|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. 
 +<box 40% right #f0f0f0>
 +Starting, break away or locked-rotor torque[(Siemens>[[| / SIMOTICS N-compact Non-Standard Motors, {accessed 21 Nov 2012}]])]
 +Sometimes, the [[torque curve]], from stationary to nominal speed, is referred to as [[starting torque curve]].[([[|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 =====
 +{{tag>Electric_motors Counter}}

Privacy and cookie policy (GDPR, etc.)