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Technical Data
Technical Data
18
Technical data for every motor type can be found in chapter "Technical Data" from p. 73.
All data valid for 40°C environmental temperature and 100K overtemperature of the win-
ding. The data can have a tolerance of +/- 10%.
18.1
Definition of Terms
Standstill torque M
The standstill torque can be maintained indefinitely at a speed 0<n<100 rpm and rated
ambient conditions.
Rated torque M
The rated torque is produced when the motor is drawing the rated current at the rated
speed. The rated torque can be produced indefinitely at the rated speed in continuous
operation (S1).
Standstill current I
The standstill current is the effective sinusoidal current which the motor draws at
0<n<100 rpm to produce the standstill torque.
Peak current (pulse current) I
The peak current (effective sinusoidal value) is approximately equivalent to 3-times the
rated current. The actual value is determined by the peak current of the servo amplifier
which is used.
Torque constant K
The torque constant defines how much torque in Nm is produced by the motor with 1A
r.m.s. current. The relationship is M=I x K
Voltage constant K
The voltage constant defines the induced motor EMF, as an effective sinusoidal value
between two terminals, per 1000 rpm
Rotor moment of inertia J [kgcm²]
The constant J is a measure of the acceleration capability of the motor. For instance, at I
the acceleration time t
Thermal time constant t
The constant t
overtemperature of 0.63 x 105 Kelvin. This temperature rise happens in a much shorter
time when the motor is loaded with the rated current.
U
N
Rated mains voltage
U
n
DC-Bus link voltage. U
English - 40
04/2017
[Nm]
0
[Nm]
n
[A]
0rms
[A]
0max
[Nm/A]
Trms
-1
[mV/min
]
Erms
from 0 to 3000 rpm is given as:
b
´
p
m
3000
2
t
[ ] =
s
´
b
M
´
s
´
4
60
10
0
[min]
th
defines the time for the cold motor, under a load of I0, to heat up to an
th
=
*
U
2
n
N
(up to I = 2 x I
)
T
0
2
´
J
with M
in Nm and J in kgcm²
0
cm
2
Servomotors Cartridge DDR
Kollmorgen
0
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