Hi guys could you help me with these question please.
cheers.....
1.) why is it possible to start a small motor directly on-line(DOL) but impractical for large ones.?
2.) why is the motor inefficient at high values of slip?
3.) why does AC Motor draw current even though the slip is zero.?
4.) under no load the motor spins at a speed below the synchronous speed(1500rpm -for a 4 pole motor @ 50 Hz).why is that?
5.) what is the difference between the Slip current in Delta connection to that of the Slip current in Star connection.?
cheers.....
1.) why is it possible to start a small motor directly on-line(DOL) but impractical for large ones.?
2.) why is the motor inefficient at high values of slip?
3.) why does AC Motor draw current even though the slip is zero.?
4.) under no load the motor spins at a speed below the synchronous speed(1500rpm -for a 4 pole motor @ 50 Hz).why is that?
5.) what is the difference between the Slip current in Delta connection to that of the Slip current in Star connection.?