Bosch Rexroth MKE Series - 4 Technical Data; Definition of Parameters; Parameters on the Data Sheet

4 Technical Data
4.1 Definition of Parameters
4.1.1 Parameters on the Data Sheet
Description Symbol Unit Description
Continuous torque at standstill 60K
M
0_60
Nm
Continuous torque that can be released to the motor output
shaft at a speed of n ≥ 0.1 Hz.
Continuous torque at standstill 60K
I
0_60(rms)
A
Phase current (crest value) of the motor M
dN
required for the
continuous torque at standstill MdN at a speed of n ≥ 0.1 Hz.
Maximum torque
M
max
Nm
Maximum torque I
max
that can be released for about 400 ms
(manufacturing tolerances +5 % / 20 %).
Maximum current
I
max(rms)
A
Maximum, briefly permissible phase current (crest value) of
the motor winding without adverse affect on the permanent
magnet circuit of the motor.
Torque constant at 20 °C
K
M_N
Nm/A
Ratio of the generated torque to the motor phase current (crest
value) at a motor temperature of 20 °C. Unit: (Nm/A). Appli‐
cable up to approx. i = 2x I
dN
.
Constant voltage at 20 °C
K
EMK_1000
V/min
-1
Root-mean-square value of the induced motor voltage at a
motor temperature of 20°C and 1000 revolutions per minute.
Winding resistance at 20 °C
R
12
Ohm Resistance measured between two winding ends in ohms (Ω).
Winding inductivity
L
12
mH Inductivity measured between two phases in (mH).
Discharge capacity
C
ab
Number of pole pairs o
Moment of inerta of rotor
1)
J
rot
kgm
2
Moment of inertia of the rotor without the optional holding
brake. Unit = kgm².
Thermal time constant
T
th
min
Time of the temperature rise to 63% of the maximum temper‐
ature of the motor housing with the motor loaded with the
permissible S1 continuous torque. The thermal time constant
is defined by the type of cooling used.
① chronological course of the motor housing
temperature
Θmax highest temperature (motor housing)
Tth Thermal time constant
Fig.4-1: Thermal time constant
Maximum torque
n
max
min
-1
Maximum permissible speed of the motor. Limiting factors can
have mechanical (centrifugal forces, bearing stress) or elec‐
trical (DC link voltage) causes.
Project Planning Manual | Rexroth MKE Synchronous Motors Electric Drives
and Controls
| Bosch Rexroth AG 23/131
Technical Data