PACMotion™ Rotary Servo Motors Installation and User Manual
Section 7
GFK-3169B
October 2020
Technical Data
22
Section 7:
Technical Data
All data valid for 40°C environmental temperature and 100K overtemperature of the winding. Determination
of nominal dates with constant temperature of adapter flange of 65°C. The data can have a tolerance of +/-
10%.
7.1
Definition of Terms for Technical Data
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 ambient 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) I0max [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 KTrms [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 KErms [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:
Thermal time constant tth [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 tBRH [ms] / Engage delay time tBRL [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. =
𝑈
𝑛
= √2 ∗ 𝑈
𝑁
