Patent ID: 6877837
Filing Date: 2005-04-12
Classification: B41J,G05B

Abstract:
1. A control unit for controlling a motor for use in a printer, comprising: a speed control part to control an object to be controlled that is driven by the motor by acceleration control, constant speed control, deceleration control, and stoppage control by controlling a current to be applied to the motor; an inertia calculating part to calculate inertia of the object based on angular acceleration of the motor under the acceleration control of the object, and current values to be applied to the motor under the acceleration control and the constant speed control of the object, the calculated inertia being used by the speed control part for controlling the current to be applied to the motor; and, a stoppage current calculating part to calculate a stoppage current to be used for stopping the object at a target position based on the calculated inertia, an angular velocity of the motor under the deceleration control of the object, the current value of the motor under the constant speed control of the object, and a stoppage constant T wherein a predetermined current value Iacc is applied to the motor in a constant current acceleration range under the acceleration control for accelerating the object, the inertia calculation part calculating angular acceleration Δω/Δt in the constant current acceleration range, and calculating inertia J of the object based on the angular acceleration Δω/Δt, a current value I