| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a motor control device capable of vector-controlling a motor by detecting the rotation position of a rotor without using a position detecting sensor, irrespective of the rotational speed of the rotor. <P>SOLUTION: The motor control device includes a current control unit 2 for calculating a drive current based on a target current and a two-phase current and calculating a drive voltage, a frequency setter 7 for setting the frequency of a high-frequency voltage to be superposed on the drive voltage based on the number of rotations of the rotor of the motor 12 and the target torque, a high-frequency voltage superposing unit 16 for superposing the high-frequency voltage on the drive voltage, a band-stop filter 9 having a set frequency band to be blocked in accordance with the frequency of the high-frequency voltage and filtering the two-phase current, and a rotation state calculation unit 11 having a set frequency band for filtering in accordance with the frequency of the high-frequency voltage, and calculating the number of rotor rotations and the rotation position based on the two-phase current after passing through the bandpass filter 8 for filtering the two-phase current. <P>COPYRIGHT: (C)2010,JPO&INPIT |
