Acoustics – Sound-modifying means – Housing or enclosure
Patent
1991-05-15
1993-02-02
Gellner, Michael L.
Acoustics
Sound-modifying means
Housing or enclosure
181205, 181207, 310 51, H02K 524
Patent
active
051839750
ABSTRACT:
A muffler for an air-cooling system used for channeling air for cooling an electric motor comprises a housing mounted on the electric motor and formed with an air inlet; and an air outlet and an air passage extending between and connecting the inlet and the outlet. Air from outside the housing employed to cool the motor enters through the inlet, flows through the passage and exits through the outlet. Noise having a spectrum of frequencies including a relatively low main discrete frequency, which corresponds to a relatively long wave-length, and a plurality of higher frequencies is generated in the cooling air during operation of the motor and its cooling system. A baffle is positioned within the housing adjacent to the outlet to interrupt lines of sight from the air passage to the outside of the housing. The housing and the baffle are made of a metal or plastic and have sufficient mass to attenuate the higher frequencies of the noise spectrum to a substantial degree. A sound-absorbent material is positioned on the interior surfaces of the housing and has an effective thickness equal to between approximately one-eighth and one-half of the wavelength of the relatively low main discrete frequency of the noise spectrum. The inlet, outlet, and air passage are of large cross section to enable cooling of the motor using low air velocities at low back pressures. The inlet and outlet are located relative to the motor and direct exhaust air in such a manner as to minimize recirculation of the air.
REFERENCES:
patent: 771468 (1904-10-01), Falk
patent: 1476776 (1923-12-01), Stamm et al.
patent: 2505854 (1950-05-01), Curzon
patent: 2726807 (1955-12-01), Lewis
patent: 2777079 (1957-01-01), Egglestone
patent: 2881337 (1959-04-01), Wall
patent: 2886721 (1959-05-01), Picozzi
patent: 3389278 (1968-06-01), Jaeschke
patent: 3980912 (1976-09-01), Panza
patent: 4007388 (1977-02-01), Lawyer
patent: 4119873 (1978-10-01), Sakurai
patent: 4146112 (1979-03-01), Usry
patent: 4230960 (1980-10-01), Mayher
patent: 4266602 (1981-05-01), White et al.
Burke Robert R.
Craggs Jack L.
Dang Khanh
Gellner Michael L.
Siemens Energy & Automation Inc.
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