Electricity: motive power systems – Automatic and/or with time-delay means – Sound – supersonic vibration or mechanical vibration
Patent
1996-10-02
2000-11-07
Martin, David
Electricity: motive power systems
Automatic and/or with time-delay means
Sound, supersonic vibration or mechanical vibration
318611, 318629, 318599, 318606, 318811, 388831, G05B 500
Patent
active
061441767
ABSTRACT:
A method and apparatus for substantially reducing tonal noise and or vibration generated by a rotating machine. The power supplied to the rotating machine or motor drive signal is modulated as a function of time so that the shaft rate of the rotating machine is varied as a function of time. The motor drive signal or power signal can be modulated in an alternating current (AC) machine wherein the shaft rate is related to the power line frequency, as well as a direct current (DC) machine wherein the shaft rate is related to the DC level applied, to alter the shaft rate as a function of time. Such drive power modulation causes the drive signal energy to spread into new frequencies. As a result, the radiated tonal components are spread out such that the strength of the rotating machine's tonal radiation is substantially reduced. In addition, "beating" effects related to the operation of multiple machines can be reduced.
REFERENCES:
patent: 4673851 (1987-06-01), Disser
patent: 4963804 (1990-10-01), Geiger
patent: 5162709 (1992-11-01), Ohi
Lucent Technologies - Inc.
Martin David
LandOfFree
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