Siemens S120 configurationmanual Thermal time constant

Technical data and characteristics

14.1 Explanations of the formula abbreviations

7HPSHUDWXUH7



Figure 14-1 Thermal time constant

, FRQVW

7LPHW

P

MCOG

ms

mL JL

RSTR,20

LSTR

Number of pole pairs of the motor.

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.

Mass of the stator without fixing screws, connectors, connection cables, and coolant.

Mass of the rotor without fixing screws. Rotor moment of inertia

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 R20 to other phase resistances using the following formula:

RSTR(T) = RSTR,20 ∙ [1 + α(T – 20°C)]

with temperature coefficient α = 0.00393 ∙ 1/K for copper. For RSTR,130, the following applies: RSTR,130 = RSTR,20 ∙ 1.4323.

Phase inductance of the stator winding with integrated fan.

178	1FW6 Built-in torque motors
	Configuration Manual, 05/2009, 6SN1197-0AE00-0BP3