MINIMIZATION OF ACTIVE POWER LOSSES IN ALTERNATING CURRENT MAGNETIC SYSTEMS

In magnetic systems of electromagnetic alternating current devices, active power losses occur in steel and copper, reducing which is an urgent task. In order to minimize the loss of active power, a method based on the geometric optimization of the magnetic system has been developed. The optimization criteria are the coefficients of the proportionality principle. The last requirement is necessary for the proper coordination of the designed device with other mechanisms and for improving the technical and economic performance of the devices. One of the proportionality principles for electromagnetic devices is the construction of designs with a given coefficient n0 = h0/c0, where h0/c0, and are the height and thickness of the winding, respectively, as the overall dimensions of the device are mainly determined by these parameters. As a rule, the value of the coefficient n0 can be ensured after the preliminary calculation of the magnetic circuit. On the other hand, there are complex interrelations between the coefficient n0 ampere-turns, and the temperature rise of the winding. Excessive increase or decrease of the coefficient n0 disrupts this principle, reduces the current density in the winding, increases the cross-section of the material and the winding capacity, and fails to achieve the specified temperature rise of the winding, etc. In this case, the main task of optimizing the winding dimensions is to ensure the maximum current density in the winding while maintaining the given coefficient n0, temperature rise, and the ampere-turn values obtained from the preliminary calculation. In this study, for the most common electromagnetic design, considering the given ratios of winding height to its thickness, temperature rise, and ampere-turns, the optimal parameters and dimensions of the magnetic system have been determined. Loss minimization has been carried out for electromagnetic devices with voltage winding and current winding.