Induction motor currents

Suppose a 3-phase IM is operating on a 50Hz power supply. When the motor is loaded, more current is drawn from the stator because of the demagnetizing effect of the rotor current. But the rotor current has a lower frequency i.e. slip*stator frequency. Still the reflected current in the stator is of 50Hz frequency. What's the physics behind this?

 

I understand the operation of the motor. In transformers, when a load is connected to secondary, current flows in the secondary. This current tends to demagnetize the core and hence, primary current is increased to nullify the demagnetizing secondary ampere-turns, which gives the expression N_pI_p=N_sI_s. But all the currents in transformer have same frequency, say 50Hz. In IM, if rotor current has lower frequency than the magnetizing stator current, how does the stator current due to loading has the same 50Hz frequency?

 

Say the motor is operating on 50Hz. The rotor current demagnetizes the air gap and its frequency is less than the stator current frequency. So, demagnetizing mmf has less frequency than the magnetizing mmf. To cancel out the de-magnetizing mmf, the additional stator current drawn has also a frequency of 50Hz. That's why I was wondering how stator current of 50Hz cancels out the demagnetizing mmf of a lower frequency.

 

Classic! This is the explanation I was looking for! The expressions were right in front of my eyes but I wasn't able to see how both the fields rotate synchronously! Thank you very much @Babadag!