초록 ▼

The invention provides a speed controller which detects the period of an AC signal containing information of the rotational speed of a motor and controls the rotational speed based on the detected period value and a reference speed value. More particularly, the speed controller computes the amount o

The invention provides a speed controller which detects the period of an AC signal containing information of the rotational speed of a motor and controls the rotational speed based on the detected period value and a reference speed value. More particularly, the speed controller computes the amount of the deviation of the AC signal based on continuously detected period values and the reference speed value, and then stores the computed deviation amount in a memory as a correction value. Using the correction value stored in the memory, the speed controller corrects the deviation of the period, and thus, the speed of the rotation of the motor can be controlled with extremely high precision.

대표청구항 ▼

A speed controller comprising: period detecting means for detecting a period of alternating-current (AC) signal containing information of a rotational speed of a rotating object; memory means for storing the detected period value detected by said period detecting means; calculation means for calcula

A speed controller comprising: period detecting means for detecting a period of alternating-current (AC) signal containing information of a rotational speed of a rotating object; memory means for storing the detected period value detected by said period detecting means; calculation means for calculating an error output from said detected period value and a reference speed value; driving means for supplying said rotating object with a driving power based on said error output; and correction-value computing means for computing a correction value from two continuous detected period values stored in said memory and the reference speed value.