COMPARATIVE ANALYSIS OF THE ENERGY CAPACITY OF THE EXCITATION SYSTEM OF THE TRACTOR GENERATORS

The paper describes the technique of comparing fundamentally different types of transverters rotors, namely generators with electromagnetic excitation and magnetoelectric generators. In all embodiments of the comparative analysis it is necessary to compare power capabilities of electrical machines made with different devices in excitation system (permanent magnets, excitation coils), which in principle cannot be implemented without knowing and comparing the magnetic characteristics of the power generators and inductors. To unify the content and progress of computational studies on determination of electromagnetic parameters of generators with different excitation systems and gaining on this basis visual representations of its advantages and disadvantages it is advisable to represent used in the calculations of generators characteristics of permanent magnets and electromagnets in the form of identical form and content analytic or graphic dependencies. This is about the dependence of the magnetic flows in calculated sections of the element excitation systems (in their neutral section Фэм and Фм from magnetomotive force of excitation system F3M и Фм). Most simply this problem is solved by bringing the magnetic characteristics of the electromagnets to the same form and with the same parameters and concepts as the magnetic characteristics of the permanent magnets. As a result of researches it is established that widely used in automobile and tractor electrical equip-ment permanent magnets-ferrites fabricated by powder metallurgy from a mixture of crushed iron oxide and strontium owing to the relatively low level of magnetic energy and low values of residual induction is unable to provide the same level of magnetic properties of the inductors that have the inductors of the generators with electromagnetic excitation, and therefore, their use in automotive generators should be considered inappropriate.

permanent magnet, electromagnetic system, electromagnet, demagnetization of the material, demagnetization curve, curve of return, equivalent magnet, graphic method