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This paper presents a comparative study of three types of doubly salient machines (DSMs), i.e. wound field variable flux machines (VFMs), hybrid-excited stator slot permanent magnet machines (HSSPMs), and stator slot permanent magnet machines (SSPMs). Two dimensional finite element (FE) modelling is carried out to investigate the electromagnetic performance of the VFM and the SSPM based on a global...
This paper provides a comprehensive analysis of performance difference in the flux reversal permanent magnet (FRPM) machines with various magnet arrangements. The influence of different PM arrangements on working airgap flux density harmonics is firstly revealed. The torque variation against rotor pole number for four PM arrangements is then analyzed. Results show that each arrangement exhibits superiority...
Vernier Permanent-magnet machine (VPMM) has been recognized in recent years as a substitute for permanent magnet synchronous machines (PMSM) in direct-drive applications such as wind turbine generators, motorcycles and electric vehicle/hybrid electric vehicle (EV/HEV) [1].
Since vernier permanent-magnet machine (VPMM) has the merit of low-speed operation with high output torque due to the “magnetic-gearing” effect [1], they have been used in the direct-drive applications such as wind power generator, electric vehicle/hybrid electric vehicle (EV/HEV) [2,3].
This paper proposes an axial flux magnetically geared (AFMG) permanent magnet (PM) machine for power split application in hybrid electric vehicles (HEVs). The proposed AFMG machine has the merits of simple structure and improved torque density by combining a magnetic gear (MG) with a PM machine. The machine can realise power split without changing the function of MG and PM machines. The input mechanical...
In this paper, a novel axial flux magnetically geared machine (AFMG) is presented. The proposed AFMG machine consists of stator segments equipped with concentrated windings and two permanent magnet (PM) rotors with different pole-pair numbers. The proposed AFMG offers the merit of simple mechanical structure and is suitable for applications with limited axial space. To maximize the torque, both 2D...
Due to inclement weather in recent years, the short-circuit fault cannot be ruled out in a short time on power system, and this make the transformer as the main components of the system will withstand the impact of two consecutive short-circuit current in a short time, which makes the winding disks in the initial short circuit without damage, its residual deformation and vibration situation can meet...
The transformer is one of the most important equipment of the power system, the accident that the lightning impact damages the transformer insulation often happens[1]. The main design method of transformer longitudinal insulation structure design is the wave process calculation which is basis on the transformer electromagnetic optimization design[2] [3]. So research the wave process of the transformer...
A new HVDC transmission system based on an inductive filtering method is presented in this paper, and then a unified equivalent circuit model and mathematical model are proposed for the calculation on the harmonic transfer characteristic of the new HVDC systems. Firstly, according to the topology of the new HVDC converter station, the equivalent circuit model, which is expressed by the fundamental...
A hybrid active power compensation device for current balance applied to electrical railway system is proposed. The device consists of inductive filter transformer, reversible single-phase PWM rectifier through a capacitor formed symmetrical structure are installed in two feeders of an impedance-matching balance transformer or a Scott wiring transformer. Inductive filter transformer can compensate...
This paper presents design and modeling techniques of integrated passive devices (IPDs) that can be stacked with RF chips in a highly integrated and miniaturized 3D system-in-package (SiP) for wireless applications. The research starts to study winding and modeling techniques for high efficiency planar transformers. Based upon the proposed and modeled planar transformers, the research explores novel...
The influence of the machine topology and dq-axis cross-coupling on the rotor position estimation error in an extended back-EMF based sensorless brushless AC drive is investigated by both finite element analysis and experimentally on four brushless AC machines having different rotor topologies, viz. interior circumferentially magnetized, interior radially magnetized, surface-mounted, and inset magnets...
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