| 摘要 |
PURPOSE:To control rotation unevenness and facilitate a stable revolution by a method wherein a rotation position detecting part which detects a rotation position and a correction value calculating part which calculates the correction value of the control rate of the revolution corresponding to the rotation position are provided in a microcomputer. CONSTITUTION:An adder 4, a rotation position detecting part 9 and a correction value calculating part 10 are particularly provided. A microcomputer 14 is composed of a speed detecting part 2, a speed control part 3, the rotation position detecting part 9, the correction value calculating part 10, a memory device 11 and the adder 4. The rotation position detecting part 9 detects the rotation position of a motor 1 and the correction value calculating part 10 calculates the characteristics of the revolution corresponding to the rotation position of the motor 1 by an initial characteristic value setting operation and stores it in the memory device 11 and, in an ordinary operation, calculates the correction value of the control rate of the revolution with the obtained characteristics. With this constitution, rotation fluctuation depending upon the rotation position of the motor 1 is controlled and the stable revolution can be obtained. |
