Effect # of poles on 3 phase motor current

[Rob2025]

Hello

Good morning

I want to clear my basics.

I know the formula for the speed of 3 phase motor is 120f/P.
So, if no of poles are increased then for a given frequency, the motor speed decreases and if the frequency is increased then for a given # of poles, the motor speed increases.

However, what is the effect on 3 phase motor current if no of poles are increased or decreased if while

1. The motor is running directly on 400 or 600Vac
2. The motor speed is controlled thru a VFD

 

[ahsrabrifat]

Changing pole count affects current indirectly, mainly via motor design parameters and load torque-speed demands. But generally, More poles = lower speed, more torque = slightly higher current, Fewer poles = higher speed, less torque = slightly lower current