ROTARY RECTIFIER FAULT DETECTOR AND PROTECTION DEVICE OF BRUSHLESS SYNCHRONOUS MACHINE

摘要

PROBLEM TO BE SOLVED: To provide a rotary rectifier fault detector of a brushless synchronous machine which detects a fault, without providing a detection coil, and without memorizing beforehand correlation of operation data at normal time.;SOLUTION: When the fault is generated in a rotary rectifier 3, such as opening and a short circuit of a diode 3a, a proportion of an AC component to a DC component in an exciter field current J increases. In the rotary rectifier fault detector 20, a difference C between a DC current value A and an AC effective value amount B is obtained, wherein the DC current value is obtained by passing the exciter field current J through a DC filter 22, while the AC effective value amount is obtained by multiplying an output of a root-mean-square operational circuit 23 by a gain K. When the difference C exceeds a prescribed value D, an abnormal signal S2 is generated from a timer 32. Moreover, as a harmonic component increases when the diode 3a is short-circuited, when an output E of a band pass filter 42 exceeds a prescribed value F, a second comparator 43 judges that a phase short circuit fault is generated to produce a signal S4, and a protective trip circuit 50 generates a generator stop signal S6 on an AND condition of the signals S2, S4.;COPYRIGHT: (C)2009,JPO&INPIT