68
Table 10 75 hp induction motor parameters
Parameter Motor Manufacturer (
)
Std. Estimation (
)
NL Estimation (
)
r
s
unknown
0.0886
0.0781
x
ls
unknown
0.0397
0.0378-0.0458 *
r
r
unknown
0.0515
0.0197-0.0597 *
x
lr
unknown
0.479
0.436-1.10 *
x
m
unknown
11.0
14.4
* see Fig 46
4.3.7 Non-linear Motor Model Parameters Variation During Motor Start
Fig 44 shows the variation of the parameters estimated in Section 4.3.5 during a simulation
of a 10 hp motor start. Interestingly, the stator leakage reactance term D
xls
, is estimated as
nearly zero. This effectively holds x
ls
constant and does not allow for x
ls
variations. For the
50 hp case, a very slight variation is seen and for the 75 hp case, significant variation is seen.
This is shown in Figs 45 and 46 and indicates that the stator leakage reactance variations are
more significant for larger motors. It is also possible that the shape of x
ls_typical
is not correct
for the 10 hp and the 50 hp motor and that more variations would be observed had a different
curve been used. The variations in the rotor parameters are as expected for all three motors.
Summary :
Estimation ( ) NL Estimation ( ) r s unknown 0.0886 0.0781 x ls unknown 0.0397 0.0378-0.0458 * r r unknown 0.0515 0.0197-0.0597 * x lr unknown 0.479 0.436-1.10 * x m unknown 11.0 14.4 * see Fig 46 4.3.7 Non-linear Motor Model Parameters Variation During Motor Start Fig 44 shows the variation of the parameters estimated in Section 4.3.5 during a simulation of a 10 hp motor start.
Tags :
motor,unknown,ariations,ariation,parameters,start,reactance,stator,fig,significant,motors,estimation,case