Effect of eddy current waste on the output performance of the explosive-driven ferromagnetic generators

For increasing the output energy of the explosive-driven ferromagnetic generators, a new structure of ferromagnetic element has been designed to reduce the eddy current waste. The cylinderical Nd₂Fe_l4B rare-earth magnet was cut into four separate parts, and the insulated layers were placed between magnet parts for keeping them insulating from each other. And then the four magnet parts with insulated layers were combined together again to form a new cylinder. The magnetic field calculations of the magnet cylinder and the cylinder with insulated layers were conducted by the Maxwell 3D code of the electromagnetic analysis software. The initial magnetic flux distribution of two types of cylinders were obtained. The detonation tests of ferromagnetic generators were carried out, and the electromotive forces of ferromagnetic generators were measured. The results show that the eddy current waste of the generator with insulated layers is lower than the generator without insulated layers, and the output energy of the former is higher than that of the latter.