Product Description:

The 103H7123-5040 is a two-phase stepping motor manufactured by Sanyo Denki for the StepSyn Stepping Motors series. As a rotary actuator, it converts digital pulse trains from an open-loop or closed-loop controller into incremental shaft movement, allowing deterministic positioning of slides, labeling heads, and light conveyor indexes in industrial automation cells. Mechanical features such as a 6.35 mm keyed shaft and a 38.1 mm pilot diameter match common NEMA 23 gearheads, so the motor can be integrated without custom adapters.

With an overall body length of 53.8 mm, the unit fits shallow enclosures, while its 56 mm square frame aligns with standard NEMA 23 faceplates. The motor supplies a holding torque of 0.83 N·m, meaning the energized rotor can resist that load while stationary, which is important for vertically loaded axes. Each phase is rated for 2 A per phase, so the drive electronics must deliver that continuous current at standstill or while the motor is running. Motion resolution is based on a native step angle of 1.8° per step, yielding 200 full steps per revolution and enabling fine incremental control without a mechanical encoder.

The stator mass of 0.65 kg limits the inertial load on gantry arms while providing thermal capacity for moderate duty cycles. Electrical dynamics are influenced by a phase inductance of 3.8 mH per phase and a phase resistance of 0.8 Ω per phase; together, these values establish the time constant that affects the maximum pulse rate before torque begins to decrease. The windings use a bipolar configuration, allowing the driver to reverse current in each coil for higher torque density than a unipolar arrangement. Additional mounting data include a rotor inertia of 0.21 × 10⁻⁴ kg·m², a shaft projection of 20.6 mm, mounting holes with a diameter of 4.5 mm, and hole centers spaced 47.14 mm apart for direct attachment to motion frames.