SIZING AND SELECTION INDUSTRIAL DRIVE COUPLINGS ST
Symbols
TAR | Disengagement torque of the coupling (Nm) |
K | Service factor |
Tmax | Maximum torque of the drive system (Nm) |
TAN | Rated torque of the motor (Nm) |
PDrive | Drive power (kW) |
n | Drive speed (min-1) |
∝ | Angular acceleration |
t | Acceleration time (s) 1/s² |
JL | Moment of inertia of load (kgm2) |
JA | Moment of inertia of drive (kgm2) |
TAS | Peak motor torque (Nm) |
S | Number of safety elements |
F | Tangential force (kN) |
r | Radius to element (m) |
s | Spindle pitch (mm) |
Fv | Feed force (N) |
η | Spindle efficiency |
d0 | Pitch diameter (mm) |
Fv | Feed force (N) |
CT | Torsional stiffness of coupling (Nm/rad) |
JMasch. | Total load inertia (kgm2) (e.g. shaft + sprocket + chain + roller + 1/2 of coupling) |
JMot. | Total driving inertia (kgm2) |
fe | Resonant frequency of the two mass system (Hz) |
According to disengagement torque
Safety couplings are normally selected according to the required disengagement torque, which must be greater than the maximum torque required for start-up and operation.
Disengagement torque values are often determined from the drive data and are typically a multiple of the nominal torque at the operating drive speed (TAN). In addition to a start-up torque (TMAX), the following values are used as further safety factors, depending on the load conditions:
K = 1.3 uniform harmonious load
K = 1.5 non-uniform load
K = 1.8 heavy shock load
According to resonant frequency
Load factors by machine type
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