Motor control device, image forming apparatus, motor control method, method for controlling image forming apparatus

Abstract

A target cycle recording portion () records target cycle data (Tref) into a first ring buffer () each time a reference pulse signal (Ps) is generated, thereby recording the target cycle data (Tref) sequentially into the first ring buffer (). A measured cycle recording portion () records measured cycle data (Tenc) into a second ring buffer () each time an encoder pulse signal (Pe) is generated, thereby recording the measured cycle data (Tenc) sequentially into the second ring buffer (). A phase error calculating portion () calculates a phase error PHE by integrating a difference between the target cycle data (Tref) and the measured cycle data (Tenc) that are sequentially recorded in data buffers respectively in correspondence with each other in the two ring buffers.