| 摘要 |
PROBLEM TO BE SOLVED: To utilize the magnetic flux generated from a permanent magnet of rotor of a brushless motor as effectively as possible, reduce a torque variation, and moreover prevent drop of motor efficiency and increase of manufacturing cost. SOLUTION: This inverter is structured to adjust phase of voltage based on the rotating velocity and voltage command in driving a brushless motor 11 in the sine wave driving system. Accordingly, torque variation can be reduced and, moreover, the phase of coil current and phase of induced voltage are not deviated, thereby preventing drop of motor efficiency. In the case of this structure, manufacturing cost does not rise because a current sensor is not required. In addition, since a voltage command can be adjusted when feeding of rectangular wave is changed to the feeding of sine wave, switching can be made smoothly. |
