A powered fastener driver having a motor, a biasing member configured to store a force for driving a fastener, a lifter configured to release the force, a piston configured to be urged by the force towards a bottom-dead-center position to drive the fastener into a workpiece, and a magnet coupled to the lifter for rotation therewith. The magnet is formed as a single piece including a first pair of poles having a first north pole face and a first south pole face, and a second pair of poles including a second north pole face and a second south pole face. The first north pole face is adjacent the second south pole face, and a pole junction is defined between the first and second pairs of poles. A sensor is configured to detect the pole junction. A controller is configured to control the motor based on detection of the pole junction.