Description of the planetary gearbox
2.2 Technical features and environmental conditions
Planetary gearboxes for servomotors
Operating Instructions, 09/2020, A5E50494253B AA
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2.2.4 Noise emission
Hearing damage
Hearing damage may occur if the motor exceeds a sound pressure level of 70 dB (A) due to
the type of mounting or pulse frequency.
• Reduce the sound pressure level by implementing sound damping and/or soundproofing
The servomotors with planetary gearbox are certified for a wide range of installation and
operating conditions. These conditions such as rigid or vibration-isolated foundation design
influence noise emission, in some instances significantly.
al noise
Noise not generated by the gearbox but emitted from it is not taken into consideration.
Noise emitted by the drive and driven machines or the base are not taken into consideration.
Under the specified conditions, the gearbox component emits a maximum noise level as
specified in the following tables.
The circumferential speed of the sun wheel and the sun wheel pinion significantly influence
the gearbox noise level. At other speeds or ratios, the noise level generated can deviate from
the specified values.
Formula for adding several noise sources
Use the following formula to calculate the noise level from several noise sources.
Sound level of the gearbox in dB
Sound level of the motor in dB
Sound level of the geared motor in dB
Figure 2-2 Formula to calculate the noise level
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