BYJ48 Stepper Motor This unipolar stepper motor 28-BYJ48 has five wires and four coils. The center connection of the coils is tied together and is usually used as the power connection. They are named unipolar stepper motors because power is always input from this pole. A, B, C, D four-phase LEDs indicate the working status of the stepper motor. The stepper motor has a standard interface, which can be directly plugged and unplugged when in use. 5 wires and 4 phases can be used for ordinary ULN2003 chip drivers, connected to 2 phases, support development boards, easy to use, and directly connected. Specification: Rated voltage: DC5V 4 phase Insulation resistance: >10M (500V) Dielectric strength: 600V AC/1mA/1s Step angle: 5.625 x 1/64 DC resistance: 2007% (25C) Reduction ratio: 1/64 Insulation class: A No-load traction frequency: >600Hz No-load pull-out frequency: >1000Hz Pull-in torque: >34.3mN.m (120Hz) Braking torque: >34.3mN.m Temperature rise: