Machines Flashcards

1
Q

What are salient pole rotors?

A

These low speed rotors are always a large diameter to accommodate the large number of poles required.

The poles are mounted on a large steel frame fixed to a revolving vertical shaft.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What is sychronisation?

A

The frequency of power produced by a synchronous generator must exactly match that of the system it supplies.

The output voltage and current must match

  • system frequency
  • system phase
  • voltage magnitude
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Coupling to the grid

A

Applying more torque to the rotor causes it to lead the stator field by a physical angle α and causes power to flow into the grid.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What is the frequency formula of voltage and current waveforms?

A

f = n*P/60

where P = pole pairs not poles! If given poles divide by two.

Power oscillates at double the frequency.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What is the slip formula?

A

s = (ns - nr) / ns

How well did you know this?
1
Not at all
2
3
4
5
Perfectly