How can I describe the stator current of a 3-phase locked/stalled induction motor by using equivalent circuit of the motor?


The slip at locked rotor is 1, so the rotor resistance and reactance are connected directly to neutral for the per phase model.

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Diagram from Fizgarald Kingsley Umans "Electric Machinery" 4th ed

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  • \$\begingroup\$ could you illustrate and quantify it on the diagram? \$\endgroup\$ – user16307 Mar 27 '16 at 22:04
  • \$\begingroup\$ I have added a diagram. \$\endgroup\$ – Charles Cowie Mar 27 '16 at 22:19
  • \$\begingroup\$ thanks do you think in this situation the motor gets harmed? \$\endgroup\$ – user16307 Mar 27 '16 at 22:20
  • \$\begingroup\$ A motor will be damaged if it remains at locked rotor for more than a few seconds at rated voltage. \$\endgroup\$ – Charles Cowie Mar 27 '16 at 22:24
  • \$\begingroup\$ That is based on a squirrel cage induction motor of a usual design. A motor with a high resistance rotor could tolerate full-voltage locked roter a little longer. \$\endgroup\$ – Charles Cowie Mar 27 '16 at 22:27

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