| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a control device capable of appropriately detecting whether or not irreversible demagnetization has occurred in a magnet of a permanent magnet synchronous motor even if the operation range of a drive shaft of the permanent magnet synchronous motor is limited. <P>SOLUTION: A sinusoidal command signal generation unit 17 generates a sinusoidal command signal to a torque command signal supplied to a permanent magnet synchronous motor 3. An estimated torque constant calculation unit 23 calculates an estimated torque constant relating to the permanent magnet synchronous motor 3 from a current representative value and an acceleration representative value acquired from a plurality of current values and a plurality of acceleration values in the same operation state over a plurality of periods of the sinusoidal command signal and a predetermined inertia relating to the permanent magnet synchronous motor 3. A demagnetization detection unit 24 detects whether or not irreversible demagnetization has occurred in a permanent magnet 34a, 34b, 34c, 34d of the permanent magnet synchronous motor 3 on the basis of a difference between the estimated torque constant and a predetermined torque constant relating to the permanent magnet synchronous motor 3. <P>COPYRIGHT: (C)2013,JPO&INPIT |
