Mechanical work of magnetic field energyin electromagnetic machines

Conclusions

• 1. For improving significantly the utilization of the magnetic field energy to improve mechanical work and the energy characteristics of electromagnetic machines, one must reduce the magnetic resistivity in the idle and working gaps. This is attained by expanding the area of magnetic poles and reducing the idle gap to the minimum allowed by the design.

• 2. The relative performance of magnetic systems in terms of the conversion of the stored energy of the magnetic field into mechanical work can be evaluated by integral and relative power factors.

• 3. For electromagnetic machines with a shell-type electromagnet (such as hammer or perforator motor), a magnetic system with a ferromagnetic guide should be used with windows in areas situated under the winding (coils) (see Fig. 3). This guide design improves the efficiency of electromagnetic hammer IÉ4207 from 46 to 55% and increases the machine’s specific power. Better values of specific energy characteristics and efficiencies are obtained with an electromagnetic machine where expanded polar pieces are used as guides (variant 5, Fig. 4). This system has the integral relative power factor which is the highest among the other variants of magnetic systems studied.