Patent ID: 9154066
Filing Date: 2015-10-06
Classification: G03B,H02P,H04N

Abstract:
1. A drive control apparatus comprising: a position detection unit configured to detect a rotational position of a rotor of a stepping motor; a feedback drive unit configured to drive the stepping motor by a feedback control based on an output from the position detection unit; an open loop drive unit configured to drive the stepping motor by an open loop control; and a switching unit configured to switch the driving of the stepping motor between the driving of the stepping motor by the feedback control and the driving of the stepping motor by the open loop control, wherein the switching unit is capable of switching the driving of the stepping motor between the driving of the stepping motor by the feedback control and the driving of the stepping motor by the open loop control, wherein the feedback drive unit and the open loop drive unit are both configured to drive the stepping motor by microstep driving, wherein the open loop drive unit controls the driving of the stepping motor such that as a driving frequency of the rotor increases, a microstep division ratio of the microstep driving decreases, and wherein the feedback drive unit sets the division ratio of the microstep independently of the open loop drive unit.