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This paper presents the studies of degradation mechanisms in a mono-inverter multi-machine permanent magnet synchronous (PMS) system subjected to stator phase disconnection. The system principle operation in normal condition will first be presented. The degradation scenarios and their consequences for motor phase and inverter phase disconnection modes will be analyzed in detail. Control solutions...
This paper presents a numerical model of High Pressure Sodium (HPS) lamps including the acoustic streaming. The model is implemented in COMSOL and based on the finite elements method using a D2 axi-symmetric geometry. Moreover, a revision concerning AR experimental characterizations of HPS lamps will also be provided. The obtained results will be provided and discussed. The studies in this paper will...
Acoustic resonance has been an important problem in high pressure discharge lamp supplies at high frequency due to its undesirable effects such as arc distortion, fluctuation, lamp life reduction, discharge extinction and lamp destruction in the most severe cases. Our method for the injection of adjacent signals allows the restriction of certain selected power harmonics in the lamp in order to avoid...
The high pressure sodium (HPS) lamp has widely been used in lighting for its efficacy. However, acoustic resonance is the main problem in lamp supply under high frequency operation. This paper proposes a method for acoustic resonance avoidance via the injections of several signals of adjacent frequencies using a half bridge LCC electronic ballast. The study shows that further signals can be introduced...
The supply of high intensity discharge (HID) lamp at high frequency provides important benefits in ballast optimization. However, in certain frequency range, the lamp is disturbed by the acoustic resonance (AR) which can lead to lamp arc fluctuation, extinction and lamp destruction in the worst case. This paper presents a novel approach of lamp control based on the injection of signals of approaching...
For decades, high pressure sodium (HPS) lamp has been developed to operate at high frequency in order to increase its lighting efficiency. However, it may present standing waves, acoustic resonances (AR), which can result in arc distortion, flickering, extinction and lamp deterioration in the most severe case. At high frequency, the lamp has quasi resistive behaviour with small hysteresis, which can...
In the last decades, the high pressure sodium (HPS) lamp has been developed to be supplied in high frequency in order to increase the lighting efficiency of the system lamp/ballast. However, at some given frequencies, standing acoustic waves, namely acoustic resonance (AR), might develop in the burner and cause lamp luminous fluctuation, extinction and destruction in the most serious case. Two main...
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