Product Description:

The 103H7121-0740 is a two-phase hybrid stepper motor produced by Sanyo Denki for the StepSyn Stepping Motors series. In motion-control assemblies, it converts digital pulse trains from an indexer or microcontroller into incremental shaft rotation, allowing actuators, pick-and-place heads, or small conveyors to move to precise angular or linear positions without feedback sensors. The motor advances by a basic step angle of 1.8°, so 200 command pulses complete one revolution.

The motor has a 56 mm square frame at the flange, providing a compact mounting interface. It produces 0.39 N·m of holding torque for light indexing duties. The coils draw 3 A per phase, while a resistance of 0.6 Ω per phase limits resistive loss at that current. Winding inductance is 0.8 mH per phase, allowing the current to rise quickly during microstepping. Combined with the listed resistance, this inductance keeps the electrical time constant short, so the phase current follows commanded waveforms at higher pulse rates. Unipolar wiring permits six-lead operation with the center taps connected to the supply. The body measures 41.8 mm long, allowing short-stack installation in confined brackets.

At 0.47 kg, the rotor and stator assembly adds a modest load to linear stages. The rotor inertia is 0.1 × 10⁻⁴ kg·m², supporting quick acceleration when the motor is paired with low-backlash couplings. Four M4 screws use a 47.14 mm mounting pitch, and the 4.5 mm mounting holes align with tapped plates. A 38.1 mm pilot centers the flange, while a shaft diameter of 6.35 mm permits direct connection to compatible timing pulleys. The shaft projects 20.6 mm beyond the front bearing, leaving room for set-screw hubs. The lead wires extend at least 305 mm to reach nearby drive terminals without extensions. The mounting pattern, pilot, and shaft dimensions support coupling to planetary gearboxes or lead screws in compact laboratory equipment.