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

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João Oliveira
João Oliveira 2014-4-26
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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回答（1 个）

Ahsan Rizvi
Ahsan Rizvi 2016-4-20
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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