초록 ▼

A permanent magnet made of ferrite magnet material used for a generator may be irreversibly demagnetized by a factor such as current supplied to a field coil, temperature of the permanent magnet and/or output current of an armature coil. When the field current exceeds a preset value, and also the ou

A permanent magnet made of ferrite magnet material used for a generator may be irreversibly demagnetized by a factor such as current supplied to a field coil, temperature of the permanent magnet and/or output current of an armature coil. When the field current exceeds a preset value, and also the output current exceeds a preset value, the field current is limited to prevent the irreversible demagnetization. Thus, the irreversible demagnetization of the permanent magnet can be prevented, while ensuring a sufficient amount of the output power. It is also effective that the field current or armature current is limited when the temperature of the permanent magnet is in a range of possible irreversible demagnetization.

대표청구항 ▼

[ What is claimed is:] [1.] A generating system comprising;a generator including first means for providing a magnetic field having a permanent magnet therein, an armature coil, and a voltage regulator; anda second means for controlling said magnetic field within such an amount as not to cause irreve

[ What is claimed is:] [1.] A generating system comprising;a generator including first means for providing a magnetic field having a permanent magnet therein, an armature coil, and a voltage regulator; anda second means for controlling said magnetic field within such an amount as not to cause irreversible demagnetization of said permanent magnet whereinsaid first means further comprises a field coil, andsecond means comprises a third means for detecting an indication related to said irreversible demagnetization of said permanent magnet and a current limiting unit for limiting field current supplied to said field coil according to said indication,said third means includes means for detecting temperature of said permanent magnet, andsaid current limiting unit reduces said field current as said temperature becomes lower.