Integral silencer for electric motors

Details Integral silencer for electric motors Integral silencer for electric motors

1991-01-15

1992-06-23

Stephan, Steven L.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 62, H02K 524, H02K 906

Patent

active

051246007

ABSTRACT:
An electrical motor with integral silencer is provided having a motor housing defining an inlet aperture at one end and an expansion chamber at the other end. The expansion chamber has a reduced cross-sectional area at the entrance and exit of the expansion chamber compared to the cross-sectional area of the chamber. The exit of the expansion chamber provides an outlet aperture in the housing. A stator is situated in the housing and a rotor is rotatably mounted within the stator. A fan is secured to the rotor and rotates therewith for pulling air in the outlet aperture through the stator and exhausting the air through the expansion chamber to the housing exterior. The expansion chamber provides an impedance mismatch for the acoustic energy generated by the fan preventing a portion of the acoustic energy from exiting the expansion chamber.

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patent: 4733750 (1988-03-01), Poirier et al.
Leo L. Beranek, Noise and Vibration Control, 1971, 365-367.

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