Conventional FLUX COMPRESSION GENERATORs (FCG"s) are used to generate high power ‎DC pulses. A new kind of (FCG"s) with series capacitance called Capacitive FLUX ‎COMPRESSION GENERATOR (CFCG) will be introduced and explained in this paper. This ‎new kind is used to generate modulated high power pulses. There are some problems ‎to establish a capacitance in high power and high frequency applications. In the ‎present paper several practical methods will be addresed to make capacitance in high ‎power and high frequency applications‎‏.‏

The calculation of stray capacitance (SC) between adjacent coils as series capacitance and between coil and liner as shunt capacitance are very important to consider in the design of a MAGNETIC FLUX COMPRESSION GENERATOR (MFCG). This paper presents an approach to calculate the equivalent stray capacitance (SC) of n-turn of the helical FLUX COMPRESSION GENERATOR (HFCG) coil with multi-layer conductor wire filaments (MLCWF) in the form of rectangular cross-section. This approach is based on vespiary regular hexagonal (VRH) model. In this method, wire filaments of the GENERATOR coil are separated into many very small similar elementary cells. By the expanded explosion in the liner and move explosion to the end of the liner, the coil turns number will be reduced. So, the equivalent SC of the HFCG will increase. The results show that by progress of explosion and decrease of the turns’ number in the GENERATOR coil; total capacitance of the GENERATOR increases until the explosion reaches to the second turn. When only one turn remains in the circuit, a decrease occurs in the total capacitance of the GENERATOR.

A reliable and accurate diagnosis of inter-turn short circuit faults is a challenging issue in the area of fault diagnosis of electrical machines. The purpose of this study is to present a more efficient technique in fault detection and to provide a reliable method with low-cost sensors and simple numerical algorithms which not only detects the occurrence of the fault, but also locates its position in the winding. Hence, this paper presents a novel method for diagnosis of different kinds of inter-turn winding faults in a salient-ole synchronous GENERATOR based on changes in the MAGNETIC FLUX linkage. It describes the influence of inter-turn winding faults on the MAGNETIC FLUX distribution of the GENERATOR. The main feature of the proposed method is its capability to identify the faulty coils under two types of inter-turn winding faults. Also, the occurrence of two other types of faults can be detected by the proposed technique. Simple algorithm, low cost sensor and sensitivity are the other features of the proposed technique. Experimental results derived from a 4- pole, 380V, 1500 rpm, 50 Hz, 50 KVA, 3-phase salient-pole synchronous GENERATOR confirm the validity of the proposed method.

Diagnostics of synchronous GENERATOR turn-to-turn faults can be accomplished by analyzing the anomalies of machine local variable such as MAGNETIC FLUX linkage. On the other hand, because current transformers and voltage transformers are usually installed in the machine for different purposes as default, the monitoring schemes that depend on the study of these inputs have become a topic of interest. As a consequence, in the last two decades, a variety of methods have been proposed based only on the global external variable (such as stator current and voltage). It must be noted that the global external variable analysis techniques are not capable of detecting all of the potential faults in electrical machines and some researches, including this work, aim to transfer a part of the global external variables analysis knowledge to techniques that monitor the signatures produced by the fault to the electroMAGNETIC FLUX signals (local variable). Hence, this contribution deals with the analysis of the stator turn-to-turn short circuit fault of salient-pole synchronous GENERATOR. In this paper, a fault indicator based on harmonic analysis of the MAGNETIC FLUX linkage is investigated. Experimental results derived from a 4-pole, 380V, 1500 rpm, 50 Hz, 50 KVA, 3-phase salient-pole synchronous GENERATOR, show that the proposed method is useful and effective.

Background and Objectives: Dielectric Barrier discharge (DBD) is a suitable method to generating Non-thermal plasma at atmospheric pressure, which utilizes Pulsed power supplies as exciters. Increasing pulse voltage range and frequency and compactness are important issues that should be taking into consideration. Methods: The high voltage pulse GENERATORs which are introduced in the literature have some disadvantages and complexities such as need of additional winding to reset the transformer core and operating under hard switching which increases electroMAGNETIC noise and loss. The leakage inductance of the high voltage transformer increases the rise time of the pulse which is undesirable for DBD applications. The energy stored in the leakage inductance causes the voltage spike across the switch, witch necessitates the use of snubber circuits. The main contribution of this paper is a new high voltage pulse GENERATOR with the following characteristics, 1) a capacitor is paralleled with the main switch to reset the transformer core and to provide the soft switching condition for the switch. 2) The resonant charging technique is used which doubles the secondary winding voltage which reduces the turns ratio of high voltage transformer for a certain output pulse peak. 3) The sharpening circuit using MAGNETIC switch produces a sharp high voltage pulse. Results: The proposed high voltage pulse GENERATOR is designed and simulated using Pspice software. To verify the theoretical results, a prototype with the input voltage 48 V, the output voltage pulse 1. 5 kV, and the rise time of the output pulse 50 ns is constructed and tested. Conclusion: This paper proposes a new pulse GENERATOR (PG). The proposed PG uses three techniques named forward, resonant charging, and MAGNETIC switch to produce a high-voltage nanosecond pulse. The resonant charging double the secondary voltage of the pulse transformer, which causes reduction in turn ratio of the pulse transformer and decreases the weigh, volume, and price of the PT. The MAGNETIC switch section finally produces a nanosecond high-voltage pulse. The magnitude of the output pulse can be varied using the input source voltage, the MS reset current and the duty cycle. The core of the pulse transformer resets by using a capacitor paralleled with the switch and the PG does not need any additional reset winding like the conventional DC-DC forward converter.

Design methodology of a compact size charging system for emergency uses is investigated in this paper. The system consists of a gearing unit, a GENERATOR, a charger, and some battery cells. The system’ s electrical model has been introduced and a 3-phase axial FLUX surface mounted PM GENERATOR with a concentrated winding is picked as a generation unit. The basic equations needed for the GENERATOR design are presented as well as the general considerations and constraints for the designs. After validating the design equations using Finite Element Analysis, sizing equations are used to design different machines. The resulted designs are compared based on main characteristics including output power, power delivered to the battery, and GENERATOR efficiency. Finally, the performance of the valid designs in the system model is analyzed over a wide speed range. The proposed methodology could be used to design portable power generation units for such applications as rescuing, power system outage, camping, and so on.

Compactness and lightness make high-speed axial-FLUX machines eligible for distributed generation application with microturbine. In a high-speed GENERATOR driven by micro-turbines, the rotor speed is normally above 30, 000 rpm and may even exceed 100, 000 rpm. The frequency for FLUX variation is more than 1 kHz. Therefore, designing such a highspeed GENERATOR is quite different, in mechanical and electroMAGNETIC respects, from designing conventional GENERATORs with low speed and low frequency. Important considerations in designing high-speed axial-FLUX GENERATORs (HSAFG) for microturbine are discussed in this paper. Results of the efficiency sensitivity versus air gap of the machine are also presented.

The Hybrid Excitation FLUX Switching GENERATOR (HEFSG) has gained significant popularity in recent times owing to its relatively simple remarkably efficient topology. To optimize the performance of the GENERATOR, recent advancements and emerging patterns in mathematical modeling and software simulation, along with the utilization of optimization techniques, have facilitated the development of a novel methodology for electrical machine design. This study investigates the configuration and optimization of a Hybrid Excitation FLUX Switching GENERATOR, focusing on the rotor, armature coil, and field excitation. The optimization process involves multiple sequences for each component, employing the Local Optimization Method as an iterative approach to determine the optimal sequence that yields the highest output efficiency. Through the investigation of six rotor sequences, two armature coil sequences, and two field excitation coil sequences, a detailed optimization process was conducted. Consequently, the final output voltage of the HEFSG gains a 1.10% increment of voltage compared to the initial outcomes. Several sequences have influenced the output voltage performance of the GENERATOR during the optimization process. Therefore, modifications to the design of the arrangement contribute to the expansion of the operational range of the GENERATOR.