Mutual active cancellation of fan noise and vibration

Details Mutual active cancellation of fan noise and vibration Mutual active cancellation of fan noise and vibration

2007-10-16

2007-10-16

Duda, Rina (Department: 2837)

Electricity: motive power systems

Plural, diverse or diversely controlled electric motors

Having electrical synchronizing interconnections

C318S049000, C318S268000, C417S002000, C417S042000

Reexamination Certificate

active

10989866

ABSTRACT:
A multi-fan apparatus and method incorporates mutual active cancellation of fan noise and/or vibrations. The multi-fan apparatus includes two or more fans circuits, each comprising a fan, a fan speed controller and a separate tachometer, and a fan phase controller. The phase controller is connected to at least one fan speed controller and to each tachometer. Each fan's speed is independently and dynamically maintained at the same set speed by the fan speed controllers using an independent control loops. A noise and/or vibration cancellation phase difference between fans is determined in order to achieve destructive interference of pressure waves and, thus, noise and/or vibration reduction, in pre-determined region of a system incorporating the multi-fan apparatus. The phase controller establishes and maintains this cancellation phase difference between the fans based upon feedback from the tachometers.

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