Image forming apparatus including fixing device and controller for driving fixing device, including heating process to raise temperature of heating unit of fixing device

Abstract

An image forming apparatus includes a fixing device, a motor, and a controller. The fixing device includes a heating unit and a first temperature sensor. The controller is configured to perform driving the fixing device. The driving includes a heating process. The controller is further configured to perform, during the heating process: a first control operation in which the controller rotates the motor at a first rotational speed and adjusts a duty cycle of electric power suppled to a heater of the heating unit to a higher value as a deviation between a target temperature and a temperature detected by the first temperature sensor becomes greater; and a second control operation in which the controller rotates the motor at a second rotational speed lower than the first rotational speed and restricts the duty cycle within a range lower than or equal to a restricted value.