REXROTH MKD025A-144, Manual

Page: 37 / 184

Synchronous Motors MKD General Notes on Technical Data
5-3
DOK-MOTOR*-MKD*******-PR07-EN-P Version7.0 19.05.2004
5.3 Definition of Parameters
Electric parameters
With a DC link voltage of 540 V
DC
and at the characteristic speed, the
continuous torque that can be output is approx. ½ continuous torque at
standstill.
The continuous torque that can be output at the motor output shaft at a
speed of n = 0.
Phase current (crest value) of the motor required for the continuous
torque at standstill M
dN
at a speed of n = 0.
Maximum, briefly permissible phase current (crest value) of the motor
without adverse affect on the permanent magnet circuit of the motor.
Ratio of the increase in torque to the motor phase current (crest value)
at a motor temperature of 20 °C. Unit: (Nm/A). Applicable up to approx.
I = 2x I
dN
.
Root-mean-square value of the induced motor voltage at a motor
temperature of 20
°C and 1000 revolutions per minute. Unit:
(V/1000 min
–1
).
Winding resistance measured between two phases in ohms (
Ω
).
Inductivity measured between two phases in (mH).
Number of pole pairs of the motor.
Typical useful speed defined by the manufacturer. Depending on the
particular application, other useful speeds are possible (see speed-
torque-curve).
Continuous torque that can be output at the rated speed in operating
mode S1.
Phase current of the motor at the rated speed and load with rated
torque, specified as root-mean-square value.
Power consumption of the motor at the rated speed and load with rated
torque, specified in kilowatts (kW).
Root-mean-square value of the voltage to be applied to the motor, with
the motor loaded with the rated torque and the rated speed. Unit (V).
Frequency of the rated voltage at rated speed (Hz).
Characteristic motor speed n
K
Continuous torque at standstill
M
dN
Continuous current at standstill
I
dN
Peak current I
max
Torque constant at 20 °C K
M
Voltage constant at 20 °C K
E(eff)
Winding resistance at 20 °C R
12
Winding inductivity L
12
Number of pole pairs p
Rated speed n
N
Rated torque M
N
Rated current I
N(eff)
Rated output P
N
Rated voltage U
N(eff)
Rated frequency f
N