3
Technical Data
All data valid for 40°C environmental temperature and 100K overtemperature of the winding. The
data can have a tolerance of +/- 10%.
3.1
Definitions
Standstill torque M
0
[Nm]
The standstill torque can be maintained indefinitely at a speed n<100 min
-1
and rated ambient con-
ditions.
Rated torque M
n
[Nm]
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
0rms
[A]
The standstill current is the effective sinusoidal current which the motor draws at n<100 min
-1
to
produce the standstill torque.
Peak current (pulse current) I
0max
[A]
The peak current (effective sinusoidal value) is approximately equivalent to 4-times the rated cur-
rent. The actual value is determined by the peak current of the servo amplifier which is used.
Torque constant K
Trms
[Nm/A]
The torque constant defines how much torque in Nm is produced by the motor with 1A r.m.s. cur-
rent. The relationship is M=I x K
T
(up to I = 2 x I
0
)
Voltage constant K
Erms
[mV/min
-1
]
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
0
the acce-
leration time t
b
from 0 to 3000 rpm is given as:
t s
M
s
m
cm
J
b
[ ]
=
´
´
´
´
´
3000
2
60
10
0
2
4
2
p
with M
0
in Nm and J in kgcm²
Thermal time constant t
th
[min]
The constant t
th
defines the time for the cold motor, under a load of I0, to heat up to an overtempe-
rature of 0.63 x 105 Kelvin. This temperature rise happens in a much shorter time when the motor is
loaded with the rated current.
Release delay time t
BRH
[ms] / Application delay time t
BRL
[ms] of the brake
These constants define the response times of the holding brake when operated with the rated vol-
tage from the servo amplifier.
Servomotors AKM
23
Kollmorgen
05/2006
Technical Data
