Siemens SIMOTICS T-1FW3, Configuration Manual

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Technical data and characteristics
6.3 Data sheets and characteristics
1FW3 complete torque motors
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Configuration Manual, 08/2020, A5E46027705B AA
Table 6- 4 Slot ripple and accuracy
Shaft height Slot ripple Torque accuracy
1FW315 ☐ -1 ☐☐☐☐ 1.2% ± 2.5%
1FW320 ☐ -1 ☐☐☐☐ 1.5% ± 2.5%
1FW320 ☐ -3 ☐☐☐☐ 1.3% ± 2.5%
1FW328 ☐ -2 ☐☐☐☐ 1.0% ± 2.5%
1FW328 ☐ -3 ☐☐☐☐ 1.0% ± 2.5%
Notes on torque accuracy
● Applicable for 1FW3 with encoder with/without belts
● Measurement with motor identification and friction compensation
● In torque operating range up to ± M
0
● Speed operating range 1:10 up to rated speed
● Note: external influences, e.g. motor temperature, can cause an additional long-term
inaccuracy (constancy) of approx. ± 2.5%
● Approx. ± 1% less accurate in field-weakening range
Ripple
The ripple is the unwanted characteristic of the actual value that overlies the mean value
(useful signal). With regard to torques, this is also referred to as harmonic torque. Typical
harmonic torques arise through the slot ripple of the motor, the limited resolution of the
encoder, or through the limited resolution of the voltage setting of the IGBT power unit. The
ripple in the torque is reflected in the ripple in inverse proportional to the mass inertia of the
drive.
Accuracy
The accuracy defines the magnitude of the average, repeatable deviation between the actual
value and the specified setpoint under rated operating conditions. Deviations between the
actual value and setpoint are caused by internal inaccuracies in the measuring and control
systems. External disturbances, such as temperature or speed, are not included in the
accuracy assessment. The closed-loop and open-loop controls must be optimized with
respect to the relevant variable.
6.3 Data sheets and characteristics
The voltages and currents specified in the data sheets are rms values. Other rated speeds
on request.
The specified rated data refer to V
line rms
= 400 V, Active Line Module, DC link voltage, 600 V
DC.
Note
Operation without water cooling
Complete torque motors 1FW3 can be operated without water cooling if the torque is
appropriately reduced and the thermal losses can be adequately dissipated. The reduction
factor depends on the shaft height, length and speed and can be provided when requested.