ELECTROMECHANICAL TRANSITION PROCESS CAUSED BY THE SUDDEN CHANGE IN THE RESULTANT TORQUE OF ACTIVE MECHANICAL FORCES ON THE SHAFT OF THE THREE-PHASE SYNCHRONOUS ALTERNATOR, INITIALLY IN PERMANENT SYNCHRONOUS OPERATION UNDER ELECTRICAL LOAD. ELECTRICAL MACHINES, MATERIALS AND DRIVES — PRESENT AND TRENDS, v. 21, n. 1, p. 15–26, 9 Feb.2026.