Siemens SIMOTICS T-1FW3 User Manual

Appendix
A.1 Description of terms
1FW3 complete torque motors
Configuration Manual, 08/2020, A5E46027705B AA
345
Mechanical time constant T
mech
The mechanical time constant is obtained from the tangent at a theoretical ramp-up function
through the origin.
T
mech
= 3 ∙ R
ph
∙ J
mot
/k
T
2
[s]
J
mot
=
Servomotor moment of inertia [kgm
2
]
R
ph
=
Phase resistance of the stator winding [Ohm]
k
T
=
Torque constant [Nm/A]
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
E
(value at 20° C rotor temperature)
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
0
is always greater than the rated
torque M
N
.
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
th
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
th
.
Moment of inertia J
mot
Moment of inertia of rotating motor parts.

Siemens SIMOTICS T-1FW3 Specifications

General

Brand	Siemens
Model	SIMOTICS T-1FW3
Category	Engine
Language	English