Image forming apparatus that detects stopping position of rotor of motor

An image forming apparatus that forms an image on a sheet conveyed along a conveying path, the image forming apparatus comprising:

• a rotating member;
• a motor configured to drive the rotating member, the motor including at least three coils with first terminals of the at least three coils being connected to one another;
• and
• a motor control unit configured to control the motor by controlling a potential of second terminals different from the first terminals of the at least three coils, the motor control unit detecting a stopping position of a rotor of the motor by executing measuring processing on each of a plurality of excitation phases indicated by a permutation of two coils from among the at least three coils, the measuring processing including performing control so that a coil current flows from a first coil to a second coil from among the at least three coils and measuring a current value of the coil current,
• wherein the motor control unit is configured to:
• perform control so that the coil current flows from the first coil toward the second coil in a first period of the measuring processing,
• perform control so that the coil current flowing from the first coil toward the second coil in the first period attenuates in a second period following the first period, and
• perform control so that a portion of the coil current flowing from the first coil toward the second coil flows, from the second terminal of the second coil, to a third coil, which is different from the first coil and the second coil, from among the at least three coils, from the second terminal of the third coil, for a third period, which is part of the second period.