103H7123-5010 Sanyo Denki
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The Sanyo Denki 103H7123-5010 is part of the StepSyn Stepping Motors series and is a bipolar, two-phase motor with a holding torque of 0.83 Newton-meters. It has a frame size of 56 mm square, a body length of 53.8 mm, and a mass of 0.65 kilograms. The motor features a step angle of 1.8 degrees per step, a rated current of 2 A per phase, and an inductance of 3.8 millihenries per phase.
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Product Description:
The 103H7123-5010 is a NEMA 23 class stepper motor manufactured by Sanyo Denki within its StepSyn Stepping Motors series. Designed for open-loop positioning tasks in pick-and-place heads, index tables, and small conveyors, the unit advances the load in discrete angular increments under pulse command. By coupling electromagnetic detent torque with precise stator windings, the motor converts digital control signals into repeatable mechanical motion without the need for feedback devices. Its compact housing and standardized flange simplify integration into machine frames.
The motor occupies a square envelope measuring 56 mm on each side; this frame size aligns with common NEMA 23 mounts and is supported by a mounting pitch of 47.14 mm for through-bolt fastening. Its housing depth is only 53.8 mm, so the device fits shallow panels while still presenting a pilot diameter of 38.1 mm that centers the shaft. A 6.35 mm front shaft transmits torque to couplings, and a secondary 5.8 mm rear shaft can drive encoders or hand wheels. The motor provides a holding torque of 0.83 N·m, resisting back-drive when the phases are energized. Electrically, each coil draws 2 A per phase and has a winding resistance of 0.8 Ω per phase. These values affect the required drive supply voltage and the amount of heat generated during operation.
The electromagnetic circuit has a two-phase bipolar winding configuration, producing 200 steps per revolution with angular increments of 1.8° per step. A coil inductance of 3.8 mH per phase limits current slew and therefore influences achievable step rates without resonance. Dynamic response is aided by a rotor inertia of 0.21 × 10−4 kg·m², allowing rapid acceleration with minimal overshoot. The unit has a mass of 0.65 kg, making it suitable for moving-axis installations while providing enough mass to help damp vibration. The bipolar winding arrangement requires a compatible driver that can reverse current through each phase. Microstepping control can divide the full-step angle into smaller commanded movements when an application requires smoother low-speed rotation.
