Rockwell Automation 1398-DDM-xxx ULTRA 100 Series Drives Installation Manual - Manual (Page 271)

Publication 1398-5.2 – PDF 1997
Creating Custom Motor Files D-17
The back-EMF constant of the motor, before gearing, is computed as:
Note that the back-EMF was specified as a per phase value, and is
doubled to obtain a line-to-line value.
The motor inertia, before gearing, is computed as:
The resistance and inductances are also specified as per phase values,
and are computed as:
The thermal constant is specified in minutes, and is computed as:
Custom Motor File
The custom motor file parameters are as follows:
Intro
Intro
( )
V
rev
min
50 4000
rev
min
MAX
= 



⋅ =
80
K 270
in lb
Amp
1
8.85075
N m
in lb
1
50
0.61
N m
Amp T
=
⋅ 




 ⋅
⋅
⋅




⋅ 



=
⋅
Intro
( )
K 1.1
Volts
RPM
1000
1
RPM
KRPM
2
1
50
44
Volts
KRPM
E
= 



⋅ 



⋅ ⋅ 



=
Intro
( )
J 5 in lb s 1129.85
Kg cm
in lb s
1
50
2.26 Kg cm
M
2
2
2 2
2 = ⋅ ⋅ ⋅
⋅
⋅ ⋅





 ⋅ 


= ⋅
Intro
( )
L 5.0
mH
Phase
2 10.0 mH
L -L
= 



⋅ =
( )
R 3.7
Ohms
Phase
2 7.4 Ohms
L -L
= 



⋅ =
Intro
( )
thermal time constant 30 min 60
sec
min
1800 sec
= ⋅ 



=
GENERAL CURRENT LOOP
Motor Model: A_CUSTOM Current Feedforward: 0 degrees / kRPM
Table ID: -1
Motor File: CUSTOM21.MTR ELECTRICAL
Motor Type: Synchronous Resistance: 7.4 Ohms
Number of Poles: 8 Inductance: 10.0 mH
Kt: 0.61 N-m/Amp