DEFECT JUDGING METHOD OF CURRENT DETECTING MEANS, CONTROLLER OF THREE-PHASE AC MOTOR USING ITS METHOD, AND ELECTRIC VEHICLE CONTROL SYSTEM USING ITS CONTROLLER

摘要

PPROBLEM TO BE SOLVED: To attain cost reduction by reducing a load of a microcomputer by judging a phase of a faulted current detecting means only by simple logic constitution such as four operations, without using complicated logic like a current control system, and to attain downsizing of a controller. PSOLUTION: Currents of each phase of a three-phase ac motor are converted to direct currents, respectively, by holding peak values for each rotational frequency of the motor, then obtaining mutual differences in amounts of the direct currents, and a fault current detecting means is judged by comparing the differences. PCOPYRIGHT: (C)2008,JPO&INPIT