Motor speed detection device using incremental encoder

摘要

The present invention relates to an electric motor speed detecting apparatus for detecting a speed of an electric motor using two-phase pulse signals from an encoder connected to an electric motor, the electric motor speed detecting apparatus comprising an edge detecting unit, an angle measuring unit, a time measuring unit, The present invention is characterized in that each unit latch of the first and second latches for temporarily storing edge information is made up of single latches and effective edge detection means are further provided for this purpose. By detecting only the edges necessary for calculating the motor speed as effective edges, the effective edge detecting means can simplify the hardware configuration and perform efficient motor speed calculation.