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In the vector control strategy of induction machines (IMs) fed by inverter, core loss information is critical to accurate determination of rotor magnetic field orientation and dynamic response control. However, methods introduced in IEEE-112 standard to separate the core loss on-line from the total loss are not available. This paper presents a novel real-time core loss determination approach considering...
A theoretical model for the arbitrarily-shaped groove staggered double-grating array waveguide (SDGAW) slow-wave structure (SWS) is used to calculate the characteristics of dispersion and coupling impedance for a step-shaped staggered double-grating slow wave structure for W band TWT application. The results are compared with those obtained by CST-MWS code simulation.
Amplification studies of a Ka-band harmonic multiplying gyrotron traveling wave tube are reported. Coupled cavity and the precise control of focusing magnet field were used to improve the coupling between the fundamental and the harmonic and to adapt the sensitivity of the effect of focusing magnet field on the beam-wave interaction in the tube with a high order mode operation. Some experimental phenomena...
Some experimental phenomena of a harmonic multiplying gyrotron traveling wave tube operating in 8 mm band has been discussed in this extended abstract, it has been found that the output power of the tube decreased with the increase of the filament power and its bandwidth increased with the decrease of the output power for the same beam current.
Amplification studies of a Ka-band harmonic-multiplying gyrotron traveling-wave tube (gyro-TWT) are reported. A coupled cavity with inner- and outer-intersecting couplings and precise control of the focusing magnetic field are used to improve the coupling between the fundamental and the harmonic and to adapt the sensitivity of the effect of focusing magnetic field on the beam-wave interaction in the...
In this article, a new method is utilized for enhacing output power and improving bandwidth. The works related to harmonic multiplying gyrotron traveling wave amplifier were ever reported by us in IRMMW2006 and IVEC2007, which showed that there were some contradictions between output power and band-width. The output frequency bandwidth of more 500 MHz can be reached at output pulse power of only 10...
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