Fundamental principles of the theory and practice of electric drives with a field-regulated reluctance machine

Abstract

Special features of electric drives based on a field-regulated reluctance machine (FRRM) supplying high power and regulating characteristics to an electric drive are shown: the feasibility of separate and independent control of the excitation and armature fields, multiphase, waiving schemes of three-phase power circuits, and possibility of the sinusoidal current form. It is shown that independent control of the excitation and armature fields expands the range of options for solving the problem of multicriterion optimization of an electric drive with an FRRM. Calculations show that it is possible to improve the specific values by 30–40% in an electric drive with an ideal transformer due to redistribution of the active materials in the low power electrical machines, but in mediumand high-power electric drives this effect is not so great and does not exceed 10%. Attention is paid to the fact that there are no limitations as concerns commutation conditions in an electric drive with an FRRM, which allows the magnetic flow to be increased during overloading and, therefore, the short-term electromagnetic torque to be increased by from four to eight times as compared to the rated value.