Low forming accuracy is an important defect in electromagnetic forming process of sheet metal. One of the main reasons is that shape of coil and required workpieces cylindrical and hemisphere respectively. The distance between the coil and the deformed sheet is too far at side walls, which lead to a consequence that electromagnetic force is not enough. To solve this problem, a field shaper was...
Transcranial magnetic stimulation (TMS) is a technique that uses time-varying magnetic field generated by pulsed coil current to induce time-varying electric field in the brain. It has been widely applied to neurological disease treatment and brain function research. Presently, the maximum usable repetitive rate of the stimulator is up to 100Hz, and the coil current normally used in TMS...
Pulsed electromagnetic blank holding system is a new developed facility using pulsed attractive Lorentz force as blank holding force for sheet metal forming process. The system consists of two electromagnetic coils series-connected and a RLC circuit energizing them. The key metrics of the system are the peak value and pulse width of the pulsed blank holding force. In this paper, an analytical...
The high temperature superconductor (HTS) direct current (DC) induction heater shows a great potential in improving the efficiency and heating quality, which has have been studied and validated in some laboratory-scale prototypes. Now, an industrial scale HTS DC induction heater with 1 MW is designed and manufactured in Shanghai Jiao Tong University, China. The heater is designed for aluminum...
Generally, Nb3SN and NbTi wires are used widely in superconducting applications. However, these wires are expensive and have low critical temperature (Tc of Nb3SN=18 K, Tc of NbTi=9.8 K). To maintain the low-temperature condition, liquid helium is required continuously for cooling the wire and this causes lots of maintenance cost. However, MgB2 wire has higher critical temperature than Nb3SN...
The development and of magnetic billet heating with high temperature superconductor (HTS) coils provided energy benefits to the aluminum extrusion process, compared with conventional technologies. The magnetic billet heating technique by rotating aluminum rods in a magnetic field achieved large heating capacity with high efficiency in short time for an extrusion. Recently, in an industrial...
The controllable reactor is one of the most effective methods for compensating reactive power. A novel high temperature superconducting (HTS) controllable reactor with orthogonally configured core has been proposed, analyzed, and developed. However, for the controllable reactor with dynamic inductance, the excitation analysis based on field circuit coupled method is inefficient and the...
Klystron beam focusing system with permanent magnets can increase reliability of RF power system and reduce its power consumption. A prototype magnet system with ferrite magnets was fabricated for a L-band 800 kW klystron. The power test of the klystron with the prototype magnet system has proved the feasibility of the prototype. However, multi-pole transverse magnetic field components...
Tracked inspection robots is a special robot to replace or assist of manual inspection, has great application prospects. Linear permanent magnet machine with primary-segmented is a good choice which can motion on the long distance without the use of gears. In this paper, adopting polar transformed subdomain modeling for predicting the magnetic field and forces in primary-segmented permanent...
Electromagnetic pulse welding (EPW) is an effective way to realize the connection of two different kinds of metal materials via pulsed electromagnetic forces. To improve the welding performance, a new EPW process with a dual-stage coil system was proposed for joining aluminum and steel sheets in this paper, in which one coil is used to generate a pulsed magnetic field with a short pulse width...
