Image forming apparatus

An image forming apparatus for driving and rotating, with use of a stepping motor in a multi-phase excitation mode, at least one of a photosensitive drum on which an electrostatic latent image is to be formed and a transport roller that transports a recording sheet, the image forming apparatus comprising:

• a constant-voltage control unit configured to control a drive of the stepping motor by applying a constant voltage for each phase;
• a constant-current control unit configured to control the drive of the stepping motor by regulating an amount of current for each phase by a chopping control;
• a measuring unit configured to measure a chopping count of each phase on a per-step basis;
• a chopping count determination unit configured to determine whether the chopping count of each phase is less than or equal to a predetermined count;
• and
• a control switching unit configured to cause the constant-voltage control unit to control the drive of the stepping motor when the chopping count determination unit determines affirmatively, and to cause the constant-current control unit to control the drive of the stepping motor when the chopping count determination unit determines negatively.