Chapter 6 Command Reference - 95 -
DMTKE
Motor Ke
Type
Motor
Product Rev
Syntax
<a_>DMTKE<r>
Aries 1.0
Units
Rotary motor: r = volts
(Ø-peak)/krpm (measured line-to-line)
Linear motor: r = volts
(Ø-peak)/meter/second (measured line-to-line)
Range
Rotary motor: Ø.Ø to 8ØØ.Ø : ±Ø.1
Linear motor: DMEPIT (electrical pitch) dependent
Default
Ø.Ø (DMTKE of Ø results in motor configuration error)
Response
DMTKE: <*>15.Ø
See Also
DMEPIT
,
DMTLIM
,
DMTR
,
DMTSCL
Note:
This command does not take effect until you cycle power to the drive,
or send the
RESET
command.
Auto-Setup
: When using a Parker motor and the Aries Support Tool, this
command is automatically set for the selected motor.
If you did not use the Aries Support Tool, are using non-Parker motors, or
sent an
RFS
command to the drive, the parameter is set to zero (0)—you
must
manually set this parameter
to a non-zero number. Otherwise, the drive
reports the configuration errors
E1–Motor Configuration Error
and
E7–Bad Hall State
, and shuts down the drive.
For a list of automatically configured commands, see
DMTR
.
The
DMTKE
command specifies the motor voltage constant (Ke). This
defaults to the nominal Ke of the motor selected with the
DMTR
command.
The motor’s torque/force constant (Kt) is derived from the motor’s voltage
constant (Ke) by the following relationship:
Rotary motors:
peak value
-
0
RMS,
)
/
(
200
3
3
)
/
(
‡
†
‡
†
krpm
Volts
Ke
A
Nm
Kt
π
=
Linear motors:
peak value
-
0
RMS,
sec))
/
/(
(
200
3
3
)
/
(
‡
†
‡
†
meter
Volts
Ke
A
N
Kt
π
=
Note:
The Aries requires values in rotary units. The Aries Support Tool
automatically performs these conversions when you use the Configuration
Wizard. If you do not use the Configuration Wizard, you must convert your
linear units to rotary units. For more information about conversion, see the
DMEPIT
command.
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