System, method, and computer-readable medium for reduction...

Details System, method, and computer-readable medium for reduction... System, method, and computer-readable medium for reduction...

2007-10-09

2007-10-09

Duda, Rina (Department: 2837)

Electricity: motive power systems

Switched reluctance motor commutation control

C318S132000, C318S434000, C318S432000, C388S907000, C388S911000

Reexamination Certificate

active

10650028

ABSTRACT:
A method for reducing commutation-related acoustic noise in a fan system is provided. A constant frequency periodic signal is generated and a fan commutation event is synchronized with a zero level value of the constant frequency periodic signal. A system for controlling a direct current fan is provided. The system comprises a signal generator adapted to produce a periodic signal of a constant frequency and a phase-locked loop. A zero level value of the periodic signal is synchronized with a commutation event of the fan.

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Gardner, Ph.D, Floyd M., “Phaselock Techniques,” John Wiley & Sons, Second Edition, Copyright 1979, p. 10.

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