Jk1996
Electrical
- Mar 14, 2021
- 70
I’m really trying to understand the concepts for AC induction motors but still struggling with how back EMF is produced. This is what I’ve got so far:
As the voltage is applied to the motor windings of an Induction motor the windings create a rotating magnetic field this magnetic field cuts the rotor bars this change in magnetic field therefore produces a current in the rotor bars which you in turn create a magnetic Field in the opposite direction to the magnetic field that created it.
Now this is the bit that confuses me is this second induced emf in the rotor bars what causes ‘back EMF’ and is it due to this emf cutting the windings as it rotates producing the back emf. Therefore as more slip occurs the rate at which it cuts the windings is less so hence more current drawn when there’s more slip?
As the voltage is applied to the motor windings of an Induction motor the windings create a rotating magnetic field this magnetic field cuts the rotor bars this change in magnetic field therefore produces a current in the rotor bars which you in turn create a magnetic Field in the opposite direction to the magnetic field that created it.
Now this is the bit that confuses me is this second induced emf in the rotor bars what causes ‘back EMF’ and is it due to this emf cutting the windings as it rotates producing the back emf. Therefore as more slip occurs the rate at which it cuts the windings is less so hence more current drawn when there’s more slip?