WORKING WITH THE CONTROL UNIT 5-19
SB1391 Hardware and Setup Guide - Document revision no. 1.14
Action
6. Edit the fields based on the manufacturer's specification. The specific fields depend on the
motor type selection. The fields are described in TABLE 5-6.
Warning
Failure to specify correct values for critical fields such as Nominal current,
could result in damage to the motor.
TABLE 5-6 Motor record fields
Field Motor type Description
Number of
poles
All except
DC brush
Must be specified for DC brushless (AC servo/AC
synchronous) and AC induction motors.
Maximum
required
velocity
All The maximum speed that the motor will be run.
Required.
Nominal
current
All Required to protect the motor from overcurrent. This is the
maximum amplitude of the continuous phase current.
Some manufacturers specify the rms phase current. To calculate
the nominal current from the rms phase current, multiply by
1.41.
Required.
Magnetic
pitch
Linear only Distance between two adjacent magnets. The magnetic field
changes by 180 electrical degrees along one magnetic pitch.
Nominal
velocity
AC induction
only
This parameter is used for initial calculation of the SK (slip
constant) parameter.
Torque
constant
(Kt)
Rotary only The amount of torque that the motor generates for 1A of phase
current.
Force
constant
(Kf)
Linear only The amount of force that the motor generates for 1A of phase
current
Phase
inductance
(Lmotor)
[mH]
All Phase to phase inductance. The inductance measured between
any two terminals of the motor.
Phase
resistance
(Rm) [Ohm]
All Phase to phase resistance. The resistance measured between any
two terminals of the motor.
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