I have this questions:
At what frequency must a 4-pole motor be supplied so that its synchronous speed is 1200 rev/min?
The nameplate of a standard 50 Hz induction motor quotes full load speed as 2950 rev/min. Find the pole number and the rated slip.
- A 4-pole, 60 Hz induction motor runs with a slip of 4%. Find:
(a) the speed;
(b) the rotor frequency;
- A 440 V, 60 Hz induction motor is to be used on a 50 Hz supply. What voltage should be used?
- Why can an induction motor never run at its synchronous speed?
- Choose suitable pole numbers of cage induction motors for the following applications:
a. a grindstone to run at about 3500 rev/min when the supply is 60 Hz;
b. a pump drive to run at approximately 700 rev/min from a 50 Hz supply;
I now the number of poles and slip formulas. Is there any other formula that could help me for this task?