MAGNET TEMPERATURE ESTIMATION DEVICE FOR PERMANENT MAGNET MOTOR AND MAGNET TEMPERATURE ESTIMATION METHOD FOR PERMANENT MAGNET MOTOR

摘要

A magnet temperature estimation device for a permanent magnet motor comprises: a voltage detection unit (1) for detecting a voltage when a winding is energized; a high-order component detection unit (2) for detecting a high-order component of the voltage; a reference database (3) for preliminarily storing in a table a mapping between the high-order component and two or more parameters comprising a magnet temperature and another one or more parameters as the parameters that affect the voltage for detecting the high-order component; a parameter value detection unit (4) for detecting the values of the one or more parameters; and a magnet temperature estimation unit (5) for estimating a magnet temperature corresponding to the high-order component detected by the high-order component detecting unit on the basis of the one or more parameters detected by the parameter value detection unit, and the table stored in the reference database.