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
mot
Servomotor moment of inertia [kgm
2
]
ph
Phase resistance of the stator winding [Ohm]
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
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.
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