Page 211 - Root Cause Failure Analysis
P. 211
Inverters 199
0.9
0.875
Per unit
&ties
0.85
0.825
0 1 2 3 4 5
Time (see)
Figure 165 Impact load-response comparison for V/Hz and sensorless, jlm-vector-type
inverters.
during rapid acceleration, are important performance measurements. Figure 16-6
shows the response characteristics of a flux-vector-type inverter, which can supply
three times full torque in less than 1 sec. The ability to maintain full torque, as well as
the ramp or acceleration rate of the motor, is essential in critical applications.
3.0
25 -
20 -
Per unit 15 -
of
Quantities
10 -
0.5 -
0 ShafiTorque
0. 0 Motor Sped
45
0 1 2 3 4 5
Time (sec)
Figure I66 Flux-vector inverter response charaeteristks.
