Patent ID: 8773061
Filing Date: 2014-07-08
Classification: G05B,H02P

Abstract:
1. A stepping motor drive circuit, comprising: a control-purpose controller arranged to control an operation of a stepping motor, the control-purpose controller including: a control-purpose position detecting unit arranged to detect a rotating position of the stepping motor by using a control-purpose position detector provided in the stepping motor; a rotation command information inputting unit arranged to receive command information on the rotating position of the stepping motor; a control-purpose deviation calculating unit arranged to calculate a positional deviation between the rotating position of the stepping motor detected by the control-purpose position detecting unit and the rotating position included in the command information; and an amplitude value setting unit arranged to switch operations of stator coils provided in the stepping motor pursuant to the command information, to rotate the stepping motor to the rotating position included in the command information and to increase or decrease an amplitude value of a drive current fed to the stator coils during stoppage of the stepping motor depending on the positional deviation calculated by the control-purpose deviation calculating unit.