79
2000
1500
1000
500
0
-500
T
s measured
(in-lb)
1.0
0.8
0.6
0.4
0.2
0.0
t (s)
2000
1500
1000
500
0
-500
T
s simulated
(in-lb)
Figure 52 Measured and simulated torque following a 50 hp motor stop using load
inertia I1
4.4.2.3
75 hp Motor Set-Up
Figure 53 and 54 shows similar data sets as Fig 49 and Fig 50, but for the 75 hp case. As
with the 10 hp data, there is excellent agreement between the simulated and the measured
data for the 75 hp data, but there is clearly torque ripple at the steady state condition and
significant oscillation following a motor stop, as shown in Fig 54. The steady state torque
ripple is most likely due to the water brake load not producing a constant torque. It is
common for water brake loads to produce pressure oscillations within the load [48]. These
pressure oscillations are what causes torque ripple. The magnitude of the ripple depends on
the mechanical system dynamics.
Summary :
79 2000 1500 1000 500 0 -500 T s measured (in-lb) 1.0 0.8 0.6 0.4 0.2 0.0 t (s) 2000 1500 1000 500 0 -500 T s simulated (in-lb) Figure 52 Measured and simulated torque following a 50 hp motor stop using load inertia I1 4.4.2.3 75 hp Motor Set-Up Figure 53 and 54 shows similar data sets as Fig 49 and Fig 50, but for the 75 hp case.
Tags :
torque,data,500,ripple,measured,motor,simulated,fig,load,state,oscillations,figure,following