| 摘要 |
PURPOSE:To reduce the speed pulsation of a motor by providing it with a means for deciding the quantity of compensation to disturbance and a storage means for storing the quantity of compensation being gotten, and adding the quantity of compensation to the output of a speed control means. CONSTITUTION:Considering the disturbance occurring in connection with the position of the rotor such as cogging torque, it is supposed that such disturbance occurs m times per revolution. Moreover, it is defined that it should be compensated dividing the one cycle of the cyclic disturbance and that the number of elements, which are contained in a storage means 4-1 to store the quantity of compensation, is N. An encoder 10 selects the one of mXN pulses per revolution. Thereupon, by counting the encoder pulses with an N-ary counter being the rotational position detection means 4-2, the phase of the cyclic disturbance and the value of the counter can be corresponded to 1 vs. 1. By making the value of this counter and the numbers given to n pieces of elements, which are contained in the storage means to store the quantity of compensation, correspond to each other, each phase of the cyclic disturbance and the element to store the quantity of compensation are made to correspond to each other. |
