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To solve the low power density disadvantage of direct-drive wave energy converter, caused by low direct-drive speed. A novel linear tubular field modulated permanent magnet generator is proposed, which can effectively improve the performance of this kind of generators. The operation of the proposed generator is analyzed. The generator performance is evaluated using finite element method. The results...
This article presents a method of permanently placing ferromagnetic particles in the tumor region for the duration of the treatment. It is based on the phenomenon of magnetophoresis, that is, the influence of a magnetic field with a strongly variable gradient on magnetically induced magnetic moment of particle. The presented approach has a great importance in particle separation industry as well as...
The human body represents the most important topic for many researchers. In our days, the science complexity demands the involvement of many resources and the coordinated team work of doctors, engineers, and other specialists. In the case of dental medicine, due to the nature of teeth material, their dimension and geometrical position, very important problems, like fractures, cannot be studied with...
This paper deals with the design and test of a Reluctance based Magnetic Lead Screw Power Take Off (PTO) system for a Wave Energy Converter for powering a LED light buoy. In order to meet the power requirement for the LED marking light, measurements of the seastate at the specific location of the buoy is carried out using a special wave measurement buoy. The data is used to set up a simulation model...
Magnetostriction is one of the main causes of noise and vibration in electric machinery and equipment. A decoupled method is proposed to handle the computation of magnetostriction effects and inverse magnetostriction effects in ferromagnetic materials. To consider effect of magnetostriction in structure solver, the derived magnetostriction from magnetic field solution is converted to volumetric force...
Presented paper deal with theoretical model of magnetic vascular stent in vessel bifurcation. Magnetic fluid flow was described as laminar incompressible continuum of many-bead system, using magnetic variant of Nernst-Planck equation coupled with Navier-Stokes equation, solved numerically by finite element method. Results are showing on reduction of magnetic bead flow rate through treated bifurcation...
Power electronic applications come along with very high requirements in terms of reliability. Thermal loadings stress whole electronic packages while powering the semiconductor and by environmental temperature changes. Direct copper bonding (DCB) substrates are widely used in electronic applications due to its high thermal conductivity performance. They consists of copper layers sintered onto an Al...
In the multi-degree-of-freedom high precision positioning systems, high positioning accuracy can be not achieved only with long-stroke motors. The proposed planar motor with a millimeter range of movement can be used as a precision compensation actuator for long-stroke motors due to its high positioning accuracy, high force resolution, high structural strength and low force ripples. This paper deals...
Linear switched reluctance machines (LSRM) have a relatively low force output and high force ripples. This paper discusses a double-sided linear hybrid switched reluctance machine (LHSRM) which includes permanent magnets to be embedded into the stator leg slots. The proposed LHSRM has hybrid excitation flux circuits, derived from the permanent magnets and external current excitations. Machine design...
This paper proposes a new modular arc-linear flux-switching permanent magnet motor (MAL-FSPM) used for directly driving objects rotate back and force within a limited angle. Due to double salient effect and end effect, cogging torque of MAL-FSPM is very high, especially for rotor end meeting stator end. A novel cogging torque reduction method is proposed. New structure of MAL-FSPM is established based...
An Outer-PM tubular linear generator has been designed to increase the power density and distance of relative movement. The design of the two buoys has been completed. Detailed design process of the proposed generator is described. Considering the cogging force and voltage, the linear generator has been optimized and final parameters have been determined. The integrated wave converter system has been...
To solve the problem caused by the heavily axial gravity load of the rotor and main shaft of the hydraulic generators, a superconducting induction magnetic levitation device is proposed for hydraulic generator system. AC superconducting windings are implemented to increase the levitation force. The basic structure and principle are introduced. According to the calculated magnetic field distribution,...
Gas insulated switchgear (GIS) is widely used for its good economic benefits. But mechanical faults caused by electromagnetic force occur occasionally. The conducting wire and the metal shell are exposed in the alternating electromagnetic field, which is caused by the load current and vortex. This leads to electromagnetic force because of electromagnetic induction. So it is necessary to analyze the...
In this paper, to enhance the machine performance and realize a high-precision position control performance, a dual-loop position controller is employed for the asymmetric bilateral linear hybrid switched reluctance motor (ABLHSRM). Machine characteristics are investigated by finite-element method. The dual-loop controller is constructed by employing a tradition proportional–integral differential...
DC solenoid electromagnetic contactor is widely used in electrical vehicles, airplanes, trains and other 270v high voltage DC power supply system. Due to its special working environment, the limitation of the volume and weight of the contactor is strict. This requires the contactor to have excellent shock absorption and breaking capacity. The static electromagnetic calculation model of one type of...
In this paper we have proposed an electrostatic micro-actuator able to reach high velocity in short time in one direction and stop with less damage and recoil in desired position without mechanical stopper. This device would be applicable in many applications such as optical switching and biological microinjection. In many cases which high velocity micro-actuator needed mechanical stopper had been...
This paper proposes a novel moving-coil voice coil motor(VCM) used for driving nano-positioning device. This VCM implements bilateral Halbach array permanent magnet as the stator and three separated coils with the slotted coil skeleton as the mover. The VCM can achieve large stroke and nano-level positioning accuracy with the support of the compliant mechanism. Equivalent magnetic circuit method and...
In this paper a FEM model is proposed to simulate the guide wire navigation procedure in moving vascular structures. The virtual instruments are discretized with the multi-body representation, while the moving vascular structures are represented by a sequence of binary volumes segmented from the patient's data sets. The corresponding potential fields can be obtained by applying distance transform...
The anchorage zone of cable-stayed bridge tower is the key zone related to the safety of the bridge. Traditionally, prestress tendons are arranged in the concrete tower, in order to avoid the shortcoming of circumferential tendons, a new layout of prestress tendons named as "one-way prestress tendons" is put forward. This paper analyze the spatial stress state of this new design by the software...
Compared with plane fracture problem, elastic-plastic fracture problem of stiffened plate under bending has its particularity and inevitability for research, and its essence is a three-dimensional fracture mechanics problem. The aim of this paper is to develop a method to analyze bending elastic-plastic fracture of stiffened plates with crack in plate based on Dugdale model, combined with the Paris...
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