103H6703-0140 Sanyo Denki
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The Sanyo Denki 103H6703-0140 is part of the StepSyn Stepping Motors series and features a 50 mm square flange size with a motor length of 51.3 mm. This 2-phase motor has a holding torque of 0.49 N·m and a rated current of 1 Ampere per phase. It supports unipolar wiring, offers a step angle of 1.8 degrees per step, and weighs 0.5 kg.
Internal Product Review
The 103H6703-0140 is a Sanyo Denki StepSyn stepping motor with 0.49 N·m holding torque and a 1.8° step angle. A 2-phase unipolar winding supports predictable indexing and straightforward drive matching in motion assemblies. Compact packaging and 75 N allowable radial load make the unit a strong choice for light-duty positioning service.
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Product Description:
The 103H6703-0140 is a two-phase hybrid stepping motor designed by Sanyo Denki for the StepSyn Stepping Motors series. In automated equipment, it translates pulse trains from microstepping drives into incremental shaft movement, allowing repeatable indexing, small-angle positioning, and speed control without an encoder. The 50 mm square flange and single output shaft allow the motor to mount directly to gear trains or couplings commonly used in laboratory instruments, semiconductor handlers, and light conveyors. This configuration provides compact motion control where full servo feedback is not required.
Each full rotor step advances by 1.8° per step, providing 200 discrete positions per revolution; this resolution is often sufficient for lead-screw drives and pinch-roller feeds. The coils draw 1 A per phase under rated operating conditions, so drive modules must supply that current while supporting the unipolar wiring arrangement. A static holding torque of 0.49 N·m keeps the load in place whenever excitation is present, reducing the need for an external brake. Electrical losses are influenced by a phase resistance of 6 Ω per phase, while the phase inductance of 13 mH per phase affects current rise time and the usable pulse rate. Both motor phases have the same electrical characteristics, which simplifies drive configuration and current regulation.
The compact body has a length of 51.3 mm and a mass of 0.5 kg, helping keep the moving assembly manageable inside small gantries. The shaft and bearings can withstand a radial load of up to 75 N and a thrust load of up to 15 N, supporting timing pulleys or light axial preload without premature wear. Rotor inertia is 0.118 × 10⁻⁴ kg·m², allowing quick acceleration when the motor is coupled to modest loads. A unipolar lead set connects to standard headers, and the single-shaft layout leaves the rear face clear for an encoder or hand wheel if additional position feedback or manual adjustment is needed. The bearing capacity and compact housing also support installation in space-constrained motion assemblies where the motor must drive a pulley, screw, or lightweight gear train.
