Custom motor file – Rockwell Automation 1398-DDM-xxx ULTRA 100 Series Drives Installation Manual User 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