| 摘要 |
PROBLEM TO BE SOLVED: To suppress an effect which is given upon the revolution control by the periodical torque unevenness of a motor, such as the cogging torque of a brushless motor. SOLUTION: A control circuit 13 outputs a torque signal Ta, so as to make the revolution of a brushless motor 11 agree with a revolution command value VR. Phase regulation signals PH1-PHN are given to ROMs 161a-16Na which change their reading addresses of respective sine wave data, in accordance with the respective values of the signals PH1-PHN to practice phase regulation. Digital sine wave signals from the ROMs 161a-16Na are supplied to D/A converters 161b-16Nb and converted into analog sine-wave signals. Sine wave signals from the D/A converters 161b-16Nb are added up into a correction signal SH by an adder 17. The correction signal SH is added to a torque signal Ta for obtaining a new torque signal Tb, which is supplied to an inverter circuit 15. |
