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16 Definition of Terms for Technical Data
64
Kollmorgen | June 2015
Technical data for every motor type can be found in chapter "Technical Data" (➜ # 65).
All data valid for 40°C environmental temperature and 100K temperature rise of the winding.
Determination of nominal dates with constant temperature of adapter flange of 65°C. The
data can have a tolerance of +/- 10%.
Standstill (continuous) torque M
The standstill torque can be maintained indefinitely at a speed 0<n<100 rpm and rated
ambient conditions.
Rated torque M
[Nm]
n
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 (continuous) 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 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
[Nm/A]
Trms
The torque constant defines how much torque in Nm is produced by the motor with 1A rms
current. The relationship is M=I x K
Voltage constant K
[mV/min
Erms
The voltage constant defines the induced motor EMF, as an effective sinusoidal value
between two terminals, per 1000 rpm
Rotor moment of inertia J [kg.cm²]
The constant J is a measure of the acceleration capability of the motor. For instance, at I
the acceleration time t
from 0 to 3000 rpm is given as:
b
Thermal time constant t
th
The constant t
defines the time for the cold motor, under a load of I
th
temperature rise 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
These constants define the response times of the holding brake when operated with the rated
voltage from the servo drive.
U
[V]
N
Rated mains voltage
U
[V]
n
DC-Bus link voltage.
AKMH Installation | 16 Definition of Terms for Technical Data
[Nm]
0
[A]
0rms
[A]
0max
(up to I = 2 x I
)
T
0
-1]
with M
in Nm and J in kg.cm²
0
[min]
[ms] / Engage delay time t
, to heat up to an
0rms
[ms] of the brake
BRL
0rms
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