Patent ID: 8164295
Filing Date: 2012-04-24
Classification: H02P

Abstract:
1. A stepping motor controlling device comprising: a first clock signal generator that generates a reference clock signal that is a reference for operation timings of rotationally driving a plurality of stepping motors; a second clock signal generator that, on the basis of the reference clock signal, generates, for each of the plurality of stepping motors, speed control clock signals that determine respective rotational speeds of the stepping motors; a plurality of drivers that are provided respectively for the plurality of stepping motors, and that, on the basis of the speed control clock signals for the respective stepping motors, generate pulse excitation signals and input the pulse excitation signals to the stepping motors to rotationally drive the stepping motors; and a controller that controls the second clock signal generator to generate the speed control clock signals such that phases of the respective speed control clock signals for the plurality of stepping motors differ from one another, wherein the second clock signal generator comprises: wherein the controller sets in advance, for the plurality of comparing circuits, count value range data expressing ranges of the count value that differ from one another at each of the plurality of comparing circuits.