Configuration Manual Synchronous Motors 1FK7 - Siemens ...
Configuration Manual Synchronous Motors 1FK7 - Siemens ...
Configuration Manual Synchronous Motors 1FK7 - Siemens ...
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Gearboxes<br />
Selecting/dimensioning gearboxes and important parameters/quantities<br />
Notice<br />
Switching cycles can also be superimposed vibration! The supplementary factor (f2) is then<br />
not sufficient when dimensioning the gearbox and gearboxes may fail.<br />
The complete system should be optimized so that the higher-level vibration is minimized.<br />
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Fig. 5-1 Dimensioning the gearbox<br />
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The load torque and the required traversing velocity define the gearbox output torque, the<br />
output speed and therefore the output power.<br />
The required drive power is calculated from this:<br />
Pout [W] = Pmot • ηG = (π/30) • Mmot [Nm] • nmot [rpm] • ηG 5.1.3 Dimensioning for S1 duty for naturally cooled systems<br />
The gearbox itself generates heat due to friction and acts as a thermal barrier preventing heat<br />
from being dissipated through the motor flange. This is the reason that the torque must be<br />
reduced for S1 duty.<br />
The required motor torque is calculated as follows:<br />
MV Calculated "torque loss"<br />
a π/2 for 1FT5 motors fed with square-wave current<br />
π/3 for 1FT6/1FK� motors supplied with sinusoidal current<br />
b 0.5 weighting factor for gearbox losses<br />
(without dimensions)<br />
nmot Motor speed [rpm]<br />
kT Torque constant [Nm/A]<br />
Rph. Motor phase resistance when warm<br />
[Ω] = 1.4 Rph. (Catalog)<br />
Mout Gearbox output torque [Nm]<br />
i Gearbox ratio (i>1)<br />
ηG Gearbox efficiency<br />
Pmot Motor power [W]<br />
Pout Gearbox output power [W]<br />
Mmot Motor torque [Nm]<br />
<strong>1FK7</strong> <strong>Synchronous</strong> <strong>Motors</strong><br />
5-2 <strong>Configuration</strong> <strong>Manual</strong> (PFK7), 10/2005 Edition, 6SN1197-0AD06-0BP1<br />
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