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which rotor velocity should I use to calculate the slip? Wm or Wr?

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João Oliveira 2014-4-26

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移动：Sabin 2023-12-22

Hi,

When using the asynchronous machine SI block of Simulink which rotor velocity should I use to calculate the slip?

slip =(Ws-Wm)/Ws

or

slip =Ws-Wr/Ws Where Wr=(pair poles) * Wm

If I the second option the slip usually results in high values. Is this normal?

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Ahsan Rizvi 2016-4-20

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移动：Sabin 2023-12-22

first one is true since ws - wm = wr which is slip ,where ws = sychronous speed of stator magnetic field and wm = shaft speed

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