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A family of DC/DC step-down converters with quadratic voltage transformation rate with only one low-side active switch is presented. The most promising topology using coupled inductors with pronounced step-down ratio is analyzed in detail. The circuit is especially useful for higher input voltages when diodes are used, which have lower losses than the active switch. The current and voltage waveforms...
This paper presents a holistic approach to determine the effect of online reconfiguration of the motor winding of a synchronous permanent magnet motor resulting in switching the number of turns. The analysis is based on a parameter plane, which predicts the behavior of synchronous machine designs by using only two normalized parameters, the permanent magnet flux linkage and the ratio of the quadrature...
This paper presents design studies of an integrated electrical drive employing a wound field flux switching motor (WFFSM) coupled with a Z-source inverter (ZSI). The WFFSM has field excitation coils as dc field mmf sources locate at the stator body. On the other hand, the ZSI works as a three-phase inverter with voltage boost function by adding a switching device and an impedance-network. The impedance-network...
Over the last decade, many Flux switching machines (FSM) topologies have been introduced for various application i.e. automotive, domestic appliances, aerospace etc. FSM can be classified into three groups that are Permanent magnet (PM) FSM, Field Excitation (FE) FSM and Hybrid Excitation (HE) FSM. Permanent magnet and field winding are the main sources of flux in PMFSM and FEFSM while in HEFSM, both...
The paper is based on the poster presented at IEEE Pulsed Power Conference 2015. To test EM brushgun prototype described in the associated paper [1], GEDI Lab built a massive inductive store of transformer type energized by a bank of ultracapacitors (UC bank). Its primary circuit is assembled of 28 jelly roll coils with small height-to-diameter ratio mounted in two adjacent stacks. The coils are energized...
In this work a method to detect stator insulation degradation of traction drives based on analyses of the transient current reaction caused by inverter switching is proposed. Two simple excitation methods are proposed to analyze the state of the inter-turn insulation as well as the groundwall insulation. With the standard hall-effect based closed loop current transducers used for the control of the...
A new method for direct sensing of the rotor position in switched reluctance motor is presented in this paper. In this method a new sensing unit constructed based on the motor stator and rotor laminations, is coupled to the motor. Due to the lack of electronic components, the motor can be utilized in harsh environments such as a furnace. The sensing unit behaves like the motor itself and is immune...
A new toroidally wound switched reluctance machine (TSRM) with a single continuous multi-tapped winding (CW) is presented. This machine may be driven by a 6 switch asymmetric converter which supplies uni-polar coil currents, or a 12 switch voltage source converter that supplies bi-polar coil currents. The TSRM magnetic design and power electronic control is described, and its performance is compared...
In this paper, a comparison between several induction loads operating in a One Switch - Zero Voltage Switching (1SW-ZVS) resonant converter is presented. The aim is to determine the optimal load for induction cooking systems from the point of view of maximizing the performance of a given active device (Si IGBT or SiC JFET) in this resonant topology.
In this paper, an optimal design of a high-speed switched reluctance motor (SRM) with lower torque ripple using the Taguchi method for household appliances has been presented. To enhance the efficiency and reduce the manufacture processes of the proposed high-speed double-salient SRM, the soft magnetic composite (SMC) material is adopted. Moreover, to decrease noise and vibration of the double-salient...
Resonance in electrical equipment is a major concern regarding the protection of such devices in a grid connected power system. A portion of an integrated steel plant of Steel Authority of India Limited has been simulated to identify high frequency voltage transients across the distribution transformer winding at various switching events using Alternative Transient Program (ATP). The frequencies in...
Three new PWM schemes are described for 3-phase dual inverter systems that allow a 3-limb coupled inductor to be used and produce 3/5 level pwm output voltages. A standard space vector pwm scheme is used to show that standard interleaved pwm techniques are not suitable to control the dual inverters: switching states exist that produce common-mode winding voltages. Special PWM techniques have to be...
This paper presents a design method and an online winding reconfigurations method of MATRIX motor. MATRIX motor can change its winding configuration by switching devices, it can change the motor characteristics, for example, a quasi-distributed winding excitation by using the concentrated winding is realized. This paper describes a design rule by a comparison between the conventional distributed winding...
Blinded studies with transcranial magnetic stimulation (TMS) require a valid sham condition. A wide range of sham approaches have been implemented but they have various limitations including residual electric field in the brain, inadequate reproduction of auditory and cutaneous sensations, and/or need for electrical stimulation with scalp electrodes. We propose a quadrupole TMS coil configuration...
This paper deals with a comparative study of magnetic characteristics and dynamic performances for a dual-channel switched reluctance machine (DCSRM) with different types of winding connections by using finite element analysis (FEA). Acorrding to the winding conections, there are two flux-path modes which will be called long flux-path (LFP) and short flux-path (SFP) modes. In the LFP mode, there is...
Given bellow is the mobile secondary standard of voltage ratio unit of alternating voltage (VRSS) in the range of the rated primary voltage from 3 kV up to 110/√(3) kV, approved in 2009.
The paper presents a study of an induction motor with ring stator windings. The main idea of this solution is to give a higher flexibility in obtaining of two or more number of pole pairs simultaneously with a better utilization of the machine. The developed torque in connection with the demanded input power is the major task of the analysis. The results are based on experimental tests and FEM simulation.
A method for designing a transformer used in switching power supply is presented. The transformer designed by this method has advantages of the lowest power loss and higher power density than that designed by traditional method. Furthermore, the mathematical model of power loss which is closer to the reality is built in this study. Both the current density J and the flux density Bm in terms of the...
The switched reluctance motor is a simple and robust machine, which has found application over a wide power and speed ranges in different shapes and geometries. This paper introduces a new configuration for a two phase unidirectional switched reluctance motor/field assisted generator. The proposed novel motor/generator consists of two magnetically independent stator and rotor sets (layers), where...
A novel half-bridge switching topology is presented which is based on using a split-wound series-connected coupled- winding inductor, interleaved switching, and zero-deadtime operation to achieve multi-level PWM output with a reduced part-count, reduced current ripple, and improved THD performance. This new topology is presented to highlight the design process for low power, high switching frequency...
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