Regulating device for permanent magnet synchronous motor, which prevents irreversible demagnetization of the permanent magnet and control system for it

摘要

A current maximum value detecting unit detects the maximum current value of a permanent magnet synchronous motor to prevent irreversible demagnetization of a permanent magnet of the permanent magnet synchronous motor, which may be caused by a transient current that may occur in the short circuit of the three phases, depending on a set current values that cause irreversible demagnetization associated with the permanent magnet temperature and the transient current that occurs in the short circuit of the three phases, and a set of magnetic field intensities that cause irreversible demagnetization and the permanent magnet temperature and the demagnetizing field intensity of the magnetic field Permanent magnets are associated with the permanent magnet synchronous motor, which occur in the short circuit of the three phases. A current control unit regulates the current of the permanent magnet synchronous motor, so that the current value of the permanent magnet synchronous motor is lower than the current maximum value.