| 摘要 |
PURPOSE:To conduct conversion with high precision without hardly increasing the number of sine and cosine data to be memorized by conducting the rotational conversion of vector control as the synthesis of rotational conversion by an angle shown in a counter and rotational conversion by the angle of slide within a sampling time. CONSTITUTION:An angle data is extracted from a ROM 29 by a signal from a counter 28, and rotational conversion by angles is performed by both a command generating section 23 and a feedback detecting section 24. A data is extracted from a ROM 31 by a signal acquired by adding a correction signal DELTAomegaS for frequency from a frequency control system 34 and an output omega*S from a slide computing element 30, and rotational conversion by the angle of slide is conducted by both the command section 23 and the detecting section 24. Data required regarding total angles are acquired in the former rotational conversion and minute data regarding angles close to 0 deg. in the latter one, thus improving the accuracy. |
