The usual synchronous motor power factors are unity (1.0) or 0.8 leading. Values of 0.7 or 0.6 leading will give more leading correction to an otherwise lagging system.
How do you find the power factor of a synchronous motor?
Synchronous machine power factor and angle
- Speed can be calculated by: n=120⋅fP , where f is frequency (60 Hz) and P are poles (8) … and we get the result 900 rpm.
- Power factor can be calculated by: PF=cos(PA), where PF is power factor, PA is power factor angle (is that the same as power angle?)
How the power factor of the input power to a synchronous motor may be adjusted?
The fact that the field poles of a synchronous motor are magnetically in line with the stator flux allows dc current on the field to replace ac magnetizing current on the stator. Since power factor is determined by the magnetizing current, the power factor is adjustable by changing the field current.
What is the power factor of synchronous generator?
The power factor rating of most synchronous generators is typically between 0.8 lagging to 0.95 lagging. By convention, a synchronous generator operating with a lagging power factor is producing vars, while one operating with a leading power factor is consuming vars.
What is synchronous speed and it’s formula?
The synchronous speed of an AC motor is determined by the frequency of the source and the number of poles. The RPM is calculated by multiplying the frequency times 60 and dividing by the number of pairs of poles. … Actual speed of the induction motor will be less than the synchronous speed.
What is the power factor of an RC circuit?
In a series RC circuit connected to an AC voltage source, voltage and current have a phase difference of ϕ , where cosϕ=R√R2+(1ωC)2 c o s ϕ = R R 2 + ( 1 ω C ) 2 . cosϕ is called the power factor.
How do you convert kVA to kW?
The kW to kVA Formula:
Apparent power (kVA) x power factor (pf) = actual power (kW) e.g. 100 kVA x 0.8 = 80 kW.