Evaluation of possibility of using self-ventilation to cool forced electromagnetic shock engines

Abstract

The use of shock machines with linear electromagnetic engines, for example, for immersing metal rod elements in the ground, seems quite effective due to the relatively low power consumption, the direct conversion of electrical energy into mechanical work and comparatively high specific indicators. At the same time, increased values of the impact power of machines with linear electromagnetic engines are provided under the condition of forced consumption of energy from accumulators or capacitive storage devices. Because of the relatively low voltage, these sources give significant currents (120 … 200 A) to the winding of linear electromagnetic engines during the operating cycle. In this case, the value of the ratio between losses and useful energy of the machine is significant, which limits the possibilities of creating frequency-impact machines with a long operating regime on the basis of pulsed linear electromagnetic engines with natural cooling. Thus, the intensification of the cooling process of linear electromagnetic engines of shock machines is important. In this paper, we estimate the possibility of using self-ventilation for cooling the forced linear electromagnetic engines of shock machines; the dependence of the taken-away power of losses of linear electromagnetic engines on geometrical characteristics of axial ventilating channels is defined.