Patent ID: 9572281
Date: 2017-02-14
CPC Classifications: F04B,F04D,H05K

Claim:
1. A method of controlling an air ventilating blade driven by a driving means in a cooling device of an aircraft light, with the air ventilating blade being arranged in a cooling channel between cooling fins of the aircraft light and with an oscillating of the air ventilating blade generating an airflow for cooling an LED of the aircraft light, the method comprising: operating the driving means at an operation frequency to stimulate the air ventilating blade, with the air ventilating blade oscillating in the cooling channel of the cooling device of the aircraft light at the operating frequency; adjusting the operation frequency of the driving means to stimulate the air ventilating blade at different frequencies, wherein the step of adjusting the operation frequency of the driving means comprises adjusting the operation frequency in a stepwise manner; determining a respective energy consumption of the driving means depending on the frequency at which the air ventilating blade oscillates; identifying an approximate resonance frequency of the oscillation of the air ventilating blade as the frequency at which the energy consumption of the driving means is lowest while the air ventilating blade is being stimulated; performing a first stimulation of the air ventilating blade by operating the driving means at the approximate resonance frequency, with the air ventilating blade oscillating in the cooling channel of the cooling device of the aircraft light at the approximate resonance frequency; deactivating the driving means; determining a waveform of an electric current or a voltage induced into the driving means after the deactivating of the driving means and before the oscillating of the air ventilating blade terminates; determining a resonance frequency of the oscillation of the air ventilating blade as the frequency at which the air ventilating blade oscillates after the deactivating of the driving means and before the oscillating of the air ventilating blade terminates; and performing a second stimulation of the air ventilating blade by operating the driving means at the resonance frequency, with the air ventilating blade oscillating in the cooling channel of the cooling device of the aircraft light at the resonance frequency.