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Year: 2011, Volume: 11, Number: 2
... of the motor for both speeds. motor represented the best solution for variable speed A comparison between motors with two distinct windings applications. Then, the development of frequency converters and with one winding with switchable number of poles based on transistors and later on other powerful "electronic proves a better utilization of the machine for the ...
Year: 2011, Volume: 11, Number: 2
... E LC RC p ƒ x x E ƒ €2 € € 1 € 2 € x u where € 0. ƒ LC RC LC When the switching frequency is high enough and ripples Substituting (12) into (11) leads to p are small, if we suppose the duty ratio of a switching period ...
Year: 2011, Volume: 11, Number: 2
... the field of high power and current systems with great generate harmonically optimum waves at the output. The reliability such as marine propulsion, railway traction, PWM switching frequency is quantitatively limited, since electrical vehicles, and aerospace applications [1 ], [4 ], [5]. the Space Vector Modulation (SVM ...
Year: 2011, Volume: 11, Number: 2
... Shahed University of Tehran, Iran besmi@shahed.ac.ir 1 Abstract €” This paper presents a new method to calculate [8] for determining SC in a two-winding high frequency stray capacitance between conductor wire filaments. The new transformer for circuit simulation. The approach is useful for proposed method is called vespiary regular hexagonal (VRH) ...
Year: 2011, Volume: 11, Number: 2
... Fig. 7 shows the efficiency of the proposed converter versus output power. TABLE I. PROPOSED CONVERTER SPECIFICATIONS SPECIFICATIONS VALUE Input voltage 48 V Output voltage 150 V frequency 100 kHz PO 150 W Figure 5. The measured waveform of drain-source voltage and current of auxiliary switch S a1 (vertical scale 40V/div or 3A ...
Year: 2011, Volume: 11, Number: 2
... finding could be helpful in fault diagnosis in actual power transformer windings. or in frequency domain. The identification process is normally carried out in frequency domain through inspection ... Power Delivery, vol. 19, pp. 414 €“ 422, 2004. frequency-response analysis," IEEE Trans. Power Delivery, vol. 20, [ ...
Year: 2011, Volume: 11, Number: 2
... the DFOC control system, the following hypotheses have been considered: Because K1 is a constant and then, in case of a slower r ‚ The static frequency converter (CSF) is assumed to parameter variation related to the adaptive law, we get: contain a voltage inverter. r € ki ƒ— ƒ ...
Year: 2011, Volume: 11, Number: 2
... possible solutions load flow equality and operational inequality constraints simultaneously [12]. GA has been applied to many problems [13]: including stability studies, load frequency control, unit ƒ ND ƒ commitment, reactive power compensation, and V/Q /THD ƒ ƒ (adj € bdj PDj € cdj PDj) ...
Year: 2011, Volume: 11, Number: 2
... relation between a compensated Electronic equipment which consists of a rectifier circuit is system crossover frequency and the input current distortion an example of the equipment that draws harmonic currents ... to control the input current of a PFC converter comprises a voltage ripple with twice line-frequency. circuit to follow a rectified line voltage waveform for a high This affects ...
Year: 2011, Volume: 11, Number: 2
... microwave field is custom embedded system. The microwave power generator modulated with a specific frequency. designed with this method can be programmed for output microwave pulses down to ... microwave field. On each 4U 0 ƒ— half cycle of the oscillation, the radiofrequency field pattern 2 e B0 € 2 (2) will change its polarity ...
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