GE AF-650 GP Design Manual page 11

VT Characteristics
Variable torque characteristics used for pumps and fans.
1
60° AVM
Switching pattern called 60°Asynchronous Vector Modulation (par. F-37 Adv. Switching Pattern).
Power Factor
The power factor is the relation between I
The power factor for 3-phase control:
The power factor indicates to which extent the frequency converter imposes
a load on the mains supply.
The lower the power factor, the higher the I
In addition, a high power factor indicates that the different harmonic currents are low.
All frequency converters have built-in DC link reactor in the DC link to have a high power factor and to reduce the THD on the main supply.
10
and I .
1 RMS
for the same kW performance.
RMS
x U x I cos
3
1
Power factor
=
3 x U x I RMS
I
I x cos
1 ϕ1 1
since cos
= =
I RMS I RMS
2 + 2 + 2 + .. +
I RMS I I I
=
1 5 7
AF-650 GP Design Guide
ϕ
ϕ1 = 1
2
I n