Air outlet sound absorber for a rotating electrical machine
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United States of America Patent
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-
Aug 1, 2023
Grant Date -
Jun 17, 2021
app pub date -
Nov 1, 2018
filing date -
Nov 2, 2017
priority date (Note) -
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status (Latency Note)
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Abstract
A rotating electrical machine such as a generator has a rotor disposed within a rotor housing and an air flow path passing from the rotor housing to and through a silencer to an exhaust. The silencer comprises at least one air flow path disposed adjacent at least one sound absorbing column, the column comprising a first portion having a first sound absorbing material therein and a second portion having a microperforated panel (MPP) and a resonator cavity. The second portion comprises a reactive sound absorbing unit which can be specifically tuned to suppress aero-acoustic noise generated by ventilation slots in the rotor, typically peaks at 100 Hz or 120 Hz.
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