Motor control apparatus for detecting stop position of rotor of motor and image forming apparatus

An image forming apparatus comprising:

• a rotation member configured to convey a sheet along a conveyance path;
• an image forming unit configured to form an image on the sheet conveyed along the conveyance path;
• a motor configured to drive the rotation member or the image forming unit;
• and
• a motor control unit configured to control the motor,
• wherein the motor control unit includes:
• a voltage control unit configured to control a voltage applied to a plurality of coils included in a motor to supply an exciting current to the plurality of coils;
• a current detection unit configured to detect an exciting current having flown through the plurality of coils;
• and
• a detection unit configured to detect a stop position of a rotor of the motor by performing a detection process, in which the exciting current to at least a first coil of the plurality of coils is supplied by the voltage control unit, and the exciting current is detected by the current detection unit,
• wherein the detection process includes a first period in which a first voltage of a first polarity is applied to the first coil, and a second period in which a second voltage of a second polarity is applied to the first coil, and
• wherein at least one of a voltage waveform of the second voltage or a length of the second period is determined based on a voltage waveform of the first voltage.