Sheet conveying apparatus and image forming apparatus

A sheet conveying apparatus includes a second conveying roller adjoining a motor driven first conveying roller, a phase determiner to determine a rotational phase of a rotor of the motor, a controller, and a discriminator. The controller controls a drive current flowing through a winding of the motor to reduce phase deviation. The discriminator executes a discrimination regarding one of whether a front end of a sheet has reached a nip portion and whether a rear end of the sheet has passed through a nip portion. The controller controls such that the first conveying roller rotates at a first conveying roller peripheral velocity which is different from a peripheral velocity of the second conveying roller. The discriminator executes the discrimination based on a value of a parameter corresponding to a load torque applied to the rotor where the first conveying roller rotates at the first conveying roller peripheral velocity.