Kollmorgen AKM, Instruction Manual

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AKM Installation | 1 English
1.8 Definition of Terms for Technical Data
Technical data for every motor type can be found in chapter "Technical Data" (
➜
# 167).
All data valid for 40°C environmental temperature and 100K overtemperature of the winding.
Determination of nominal data with constant temperature of adapter flange of 65°C. The data
can have a tolerance of +/- 10%.
Standstill torque M
0
[Nm]
The standstill torque can be maintained indefinitely at a speed 0<n<100 rpm and rated ambi-
ent conditions.
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 0<n<100
rpm to produce the standstill torque.
Peak current (pulse current) I
0max
[A]
The peak current (effective sinusoidal value) is several times the rated current depending on
the motor winding. The actual value is determined by the peak current of the drive 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.
current. 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. Measured at 25°C.
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
acceleration time t
b
from 0 to 3000 rpm is given as:
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 I
0
, to heat up to an over-
temperature of 0.63 x 105 Kelvin. This temperature rise happens in a much shorter time when
the motor is loaded with the peak current.
Release delay time t
BRH
[ms] / Engage delay time t
BRL
[ms] of the brake
These constants define the response times of the holding brake when operated with the rated
voltage from the servo amplifier.
U
N
Rated mains voltage
U
n
DC-Bus link voltage.
28 Kollmorgen | kdn.kollmorgen.com | June 2018