| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a motor controller which can prevent the occurrence of demagnetization of a permanent magnet, and its control method. <P>SOLUTION: The motor controller is composed of a current controller 21 which generates a current command and a voltage command from a motor current, a PWM controller 22 which generates a gate signal formed of PWM by the voltage command, a current controller 20 consisting of a vector converter 23 for converting the motor current into vector, a power converter 10 which amplifies the power of the gate signal, and a protective circuit part 30 which breaks the gate signal when the motor current gets over a specified value. Herein, the protective circuit part 30 is equipped with a allowable demagnetizing current calculating circuit 33 which calculates the allowable demagnetizing current, based on the temperature of the permanent magnet of the rotor of the motor, an overcurrent detecting circuit 32 which breaks the above gate signal when the motor current gets over the above allowable demagnetizing current value, and a magnet temperature abnormal rise detecting circuit 34 which breaks the gate signal when the temperature of the permanent magnet gets over the allowable temperature. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
