Motor Components
5.2 Drive-out couplings
Thermally insulated mounting with additionally mounted components
• Holding brake (integrated in the motor)
The torque does not have to be additionally reduced
• Gearbox
The torque has to be reduced (refer to Fig. "S1 characteristics"))
5.2
5.2
Drive-out couplings
After investigating various drive-out couplings for servomotors in conjunction with Siemens
drive converters, it was seen, that in many cases, the drive-out couplings were the cause of
vibration problems. In order to achieve optimum drive-out characteristics, ROTEX-GS
couplings from the KTR company should be used. The advantages of ROTEX-GS couplings
include:
• 2 to 4x torsional stiffness of a belt-driven gearbox
• No intermeshing teeth (when compared to belt gearboxes)
• Low moment of inertia
• Good control behavior
When it comes to mounting, the clamping hub without key is considered to be adequate up
to a coupling size of 38 and up to the specified torques that can be transferred (refer to the
appropriate Motor Configuration Manual). It must be carefully noted that the friction locked
torque must always be adequately dimensioned according to the assignment to the particular
motor frame size. The accelerating torque also has to be transferred.
From a coupling size of 42 or as an alternative to the clamping hub, we can recommend the
version with clamping ring hub. This means that the maximum coupling torque can be almost
reached.
The investigations extend to include the vibration characteristics and behavior. The
couplings assigned to the motors permit higher speed control loop gains and therefore result
in the highest possible K
V
values and uniform motion.
ROTEX GS couplings are available with 4 different plastic pinion gears with various Shore
hardnesses:
98 or 95 Shore A (average)
Alternatively: 92 Shore A
Alternatively: 80 Shore A (soft)
Alternatively: 64 Shore D (hard)
The adaptation to the existing machine masses and stiffness, which becomes possible, must
be determined, taking into account the mounted mechanical system.
General Section for Synchronous Motors
5-2 Configuration Manual, (PJAL), 11.2005 Edition, 6SN1 197-0AD07-0BP4
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