User's Manual

Technical data and characteristics
14.1 Explanations of the formula abbreviations
7LPHW
, FRQVW

7HPSHUDWXUH7
Figure 14-1 Thermal time constant
P Number of pole pairs of the motor.
M
COG
Cogging torque. This is the torque generated by the interaction between the
laminated core and permanent magnets at the air gap in stators that have been
disconnected from the power supply.
m
s
Mass of the stator without fixing screws, connectors, connection cables, and
coolant.
m
L
Mass of the rotor without fixing screws.
J
L
Rotor moment of inertia
R
STR,20
Phase resistance of the winding at a winding temperature of 20 °C.
The value of the phase resistance is required for calculating the power loss,
among other things. You can convert R
20
to other phase resistances using the
following formula:
R
STR
(T) = R
STR,20
∙ [1 + α(T – 20°C)]
with temperature coefficient α = 0.00393 ∙ 1/K for copper.
For R
STR,130
, the following applies: R
STR,130
= R
STR,20
∙ 1.4323.
L
STR
Phase inductance of the stator winding with integrated fan.
1FW6 Built-in torque motors
178 Configuration Manual, 05/2009, 6SN1197-0AE00-0BP3