Siemens SIMOTICS T-1FW3 Configuration Manual page 347

Mechanical time constant T
The mechanical time constant is obtained from the tangent at a theoretical ramp-up function
through the origin.
T
mech
J
mot
R
ph
k
T
NDE
Non-drive end
Number of poles 2p
Number of magnetic north and south poles on the rotor. p is the number of pole pairs.
Voltage constant k (value at 20° C rotor temperature)
E
Value of the induced motor voltage at a speed of 1000 rpm and a rotor temperature of 20°C.
The phase-to-phase RMS motor terminal voltage is specified.
SMI
Sensor Module Integrated
Static torque M
0
Thermal limit torque at motor standstill corresponding to a utilization according to 100 K. At n
= 0, this can be output for an unlimited length of time. M
torque M
Static current I
0
Motor phase current for generating the particular static torque. Specification of the RMS
value of a sinusoidal current.
Thermal time constant T
Defines the increase in the motor frame temperature when the motor load is suddenly
increased (step function) to the permissible S1 torque. The motor has reached 63% of its
final temperature after T
Moment of inertia J
mot
Moment of inertia of rotating motor parts.
1FW3 complete torque motors
Configuration Manual, 08/2020, A5E46027705B AA
mech
= 3 ∙ R ∙ J /k [s]
T 2
ph mot
= Servomotor moment of inertia [kgm
= Phase resistance of the stator winding [Ohm]
= Torque constant [Nm/A]
.
N
th
.
th
A.1 Description of terms
]
2
is always greater than the rated
0
Appendix
345