Influence of Applied Voltage and Frequency on Electrostatic Elimination Using AC Corona Ionizer

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  • コロナ放電型イオナイザを用いた除電における 印加電圧と周波数の影響
  • コロナ ホウデンガタ イオナイザ オ モチイタ ジョデン ニ オケル インカ デンアツ ト シュウハスウ ノ エイキョウ

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Abstract

Influence of applied voltage and frequency on electrostatic elimination by using AC corona Ionizer is investigated. The corona discharge is generated using a needle to ring electrodes with high voltage AC. The compressed air is supplied to an air nozzle to generate the air flows from the electrodes to the ion trapping metal plate. The discharge current increases and the interval of trichel pulse decreases with increasing the frequency of the applied voltage. The electrostatic elimination time decreases with increasing the air velocity. When the air pressure is lower than 13.3 kPa, the electrostatic elimination time increases with increasing the frequency of applied voltage. The bias voltage required to keep ion balance 0 V decrease with increasing the frequency when the frequency is lower than 250 Hz. On the other hands, that increases with increasing the frequency when the frequency is higher than 250 Hz. The air ions generated by the corona discharge are accumulated in the space between the needle and the ring electrodes. The amount of space charge increases with increasing frequency and decreasing air velocity. Therefore, the current into the ion trapping metal plate decreases with increasing the frequency when the air pressure is not sufficiently high.

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