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Mechanical characteristics analysis of normal and defective transformer windings with eccentric distance under short-circuit (SC) fault are conducted using three-dimensional finite element method (3-D FEM). The change characteristics of maximum stress and displacement of defective windings with different eccentric distances of high voltage winding are obtained. It is found that the increase of the...
In this paper, a novel 5-phase double-sided C-core modular linear permanent-magnet synchronous machine (MLPMSM) used for the linear steering engine is researched. Firstly, the structure of the MLPMSM is depicted. Then the thrust produced by one module and the total thrust force of the machine are deduced and analyzed. In the ideal condition, all the harmonics in the thrust force can be eliminated...
Stirling power generating system, which has the advantages of multiple energies applicable and high efficiency, is promising for aerospace applications. As the main part of Stirling power generating system, single-phase oscillating permanent-magnet linear machine (PMLM) is investigated in this paper. Firstly, the electromagnetic performances, such as no-load back electromotive force (EMF) and thrust,...
In this paper, a novel stator structure with axially tapered stator tooth tip is proposed to mitigate cogging torque and reduce the machine back EMF harmonics. Furthermore, the stator tooth tips are specifically designed to provide balanced axial electromagnetic force. In order to realize continuous variation of stator tooth tip widths, the soft magnetic composite (SMC) material is used for the stator...
Taken permanent magnet synchronous motor with similar number of slots and poles as an object, in order to solve electromagnetic vibration problem, the restrain effect on electromagnetic vibration and its harmonies by auxiliary slot is researched in this paper. This paper analyzes the reasons of radial electromagnetic force wave by the analytical method. The influence of different numbers of auxiliary...
To develop a new standard design of gas-insulated bus(GIB), an electromagnetic-structural finite element analysis has been conducted considering the electromagnetic force generated in GIB with a large current. The GIB are electrical bus-bar parts of a gas-insulated switchgear(GIS) installed as a protective device in power plants and substations. Since the electromagnetic forces generated by a large...
Transformer short-circuit force insufficient has been a hot research issue. There is some residual stress on the conductor section when winds the wounding, which produces adversely affect on winding short-circuit strength. This paper deduces the calculation model of the circular winding considering the residual stress. Taking the test transformer as an example, winding internal radiation short-circuit...
Active magnetic bearings (AMBs) provide a new proper solution to the high-performing rotating equipment. The active controlled electromagnetic forces of AMBs levitate the rotor without any contact with the stator. The advanced controller design is one of the hot issues associated with AMBs. This paper deals with the application of μ synthesis to the control of AMBs. The parametric uncertainty of the...
A linear actuator suitable for sun tracking applications, heliostats, was investigated. First, a benchmark actuator was modelled using Finite Element (FE) analysis and then a prototype was constructed. The electromagnetic force on the mover was simulated and was found to be in excellent agreement with experiment. Next; a three-phase, direct-drive, linear actuator was proposed, which has a step size...
This paper proposes a novel modular linear primary permanent-magnet vernier (LPPMV) machine. With PMs and windings placed on the primary side, this machine possesses a simple secondary side, suitable for long stroke applications such as urban rail transit. Owing to its appropriate primary structure and the Halbach PM arrays, the proposed LPPMV machine offers higher force density, higher back-EMF and...
Most torque ripple reduction strategies for rotating motor are not suitable for long stator linear synchronous motor (LSLSM). In this paper, the electromagnetic force ripple reduction method for LSLSM based on the structure that the pole pitch of the mover (τm) is different from the pole pitch of the stator (τs) is analyzed. Both mathematical derivation and 2-D finite element method (FEM) are adopted...
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