45
-10000
-8000
-6000
-4000
-2000
0
Torque (in-lb)
100
90
80
70
60
50
40
30
20
10
Interruption Duration (cycles)
10000
8000
6000
4000
2000
0
Torque (in-lb)
300
200
100
0
Current (A)
2000
1600
1200
800
Speed (rpm)
Figure 31 Maximum shaft torque, minimum shaft torque, current peak, shaft speed
versus interruption duration
The magnitude of the torque transient is greatest when the back-emf from the motor is about
200 degrees out of phase with the supply voltage when the supply voltage returns. Also, the
magnitude of the torque transient decreases as the magnitude of the back-emf decreases. Fig
32 illustrates this behavior. The maximum torque, the minimum torque, the phase angle
between the back-emf of the motor and the supply voltage at the instant of reconnection, and
the per-unit magnitude of the back-emf at the instant of reconnection are plotted. Clearly
there is no negative torque transient present when the back-emf of the motor and the supply
voltage are in phase at the instant of reconnection.
Summary :
45 -10000 -8000 -6000 -4000 -2000 0 Torque (in-lb) 100 90 80 70 60 50 40 30 20 10 Interruption Duration (cycles) 10000 8000 6000 4000 2000 0 Torque (in-lb) 300 200 100 0 Current (A) 2000 1600 1200 800 Speed (rpm) Figure 31 Maximum shaft torque, minimum shaft torque, current peak, shaft speed versus interruption duration The magnitude of the torque transient is greatest when the back-emf from the motor is about 200 degrees out of phase with the supply voltage when the supply voltage returns.
Tags :
torque,backemf,supply,magnitude,oltage,instant,motor,shaft,transient,phase,reconnection,2000,current