APPARATUS AND METHOD FOR MONITORING CONDITION OF PERMANENT MAGNET SYNCHRONOUS MOTORS, AND RECODING MEDIUM HAVING PROGRAM FOR EXECUTING THE METHOD

摘要

PURPOSE: A state diagnosis device of permanent magnet synchronizing motor, a diagnosing method, and a recording medium to record the program for progressing the diagnosis method are provided to easily diagnose the demagnetization state of permanent magnet of permanent magnet synchronizing motor and the eccentricity state of rotor without disassembling the motor or using any expensive additional equipment. CONSTITUTION: A state diagnosis device of permanent magnet synchronizing motor comprises a magnetic field generator(1110), a stator current measuring part(1120), and a state diagnosis part(1130). A magnetic field generator generates multiple magnetic fields which were overlapped by the DC magnetic field and AC magnetic field toward the pole of permanent magnet when the rotor is in the stationary state. A stator current measuring part measures a flowing current in the stator winding that corresponds to a generated magnetic field respectively. A state diagnosis part diagnoses the trend of differential inductance regarding the polar direction constituent value of permanent magnet which flows the stator winding based on the demagnetized state of permanent magnet and the eccentric state of rotor. [Reference numerals] (1110) Magnetic field generator; (1120) Stator current measuring part; (1130) State diagnosis part; (AA) Stator; (BB) Rotor; (CC) Permanent magnet; (DD) Stator wiring; (EE) Motor