Hi,
I'm a mechanical engineering student and I have an exam soon on Electrical Energy Systems. I am pretty rubbish at all things electrical and would really appriciate some help.
I am trying to solve this question on synchronous machines.
The problem
Attached jpg.
My attempt;
I know that the rotor speed is found by;
S=120(frequency)/(number of poles)
If I use the rated frequency I get 1000rpm for my answer.
I am also aware that;
slip speed=(sync speed)(rotor speed)
How do I determine the synchronous speed from this?
I'm a mechanical engineering student and I have an exam soon on Electrical Energy Systems. I am pretty rubbish at all things electrical and would really appriciate some help.
I am trying to solve this question on synchronous machines.
The problem
Attached jpg.
My attempt;
I know that the rotor speed is found by;
S=120(frequency)/(number of poles)
If I use the rated frequency I get 1000rpm for my answer.
I am also aware that;
slip speed=(sync speed)(rotor speed)
How do I determine the synchronous speed from this?
Attachments

96 KB Views: 33