Learn about silencing mechanisms for vane air motors
The noise generated by an air motor is mainly caused by the exhaust air exiting the motor. The noise level increases with speed and is greatest at free speed.
All Atlas Copco motors are supplied with a threaded exhaust port permitting a screw-in silencer to be fitted to reduce noise level. By fitting a hose between the exhaust port and the silencer the noise level can be reduced even further. The effect of employing the various silencing techniques is indicated in the illustration and table below. Note that a silencer may cause power losses if incorrectly sized.
Example of: 0.36 kW motor No-load speed Anechoic room Interval of 1 minute
Example of: 0.36 kW motor No-load speed Anechoic room Interval of 1 minute
| Illustration no. | Measure | Noise level dB (a) |
| 1 | None | 94 |
| 2 | Silencer only | 77 |
| 3 | Hose only | 84 |
| 4 | Hose with silencer | 75 |