Rockwell Automation 1398-DDM-xxx ULTRA 100 Series Drives Installation Manual - Manual (Page 266)

Publication 1398-5.2 – PDF 1997
D-12 Creating Custom Motor Files
Some manufacturers specify the resistance in Ohms/phase. The phase-
to-phase resistance requested by ULTRA Master is twice the per
phase value.
Inductance
The inductance value is the measured phase-to-phase inductance in
milliHenries of the stator winding. The inductance is used to set the
current regulator gains, and is critical to current loop performance.
The inductance value can be in the range from 0.0039 to 255.9961mH.
The ratio of motor inductance to motor resistance is defined as the
electrical time constant of the motor. Always verify this value is in a
reasonable range. Electrical time constants less than ~1mS, and higher
than about ~50mS, present difficulties in the current regulator and
should be avoided.
Inductances less than ~1mH suffer from high current ripple, and are
not recommended for use with the ULTRA 100 Series drives.
Some manufacturers specify the inductance in milliHenries/phase.
The phase-to-phase inductance is twice the per phase value.