103H8221-0441 Sanyo Denki
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The Sanyo Denki 103H8221-0441 is a 2-phase stepping motor from the StepSyn Stepping Motors series. It has a holding torque of 2.15 Newton-meters and a body length of 92.2 millimeters. The motor features a 1.8 degree step angle and is designed with a unipolar winding type.
Internal Product Review
The 103H8221-0441 is a Sanyo Denki StepSyn stepping motor built with a 2-phase unipolar winding for dependable motion control. A 1.8° step angle paired with 2.15 N·m holding torque gives this unit accurate indexing and strong static load retention.
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Product Description:
The 103H8221-0441 is a hybrid stepping motor produced by Sanyo Denki within the StepSyn Stepping Motors series. It converts digital pulse commands from a microstep drive into precise incremental shaft motion, making it suitable for feeders, small gantries, and indexing tables where repeatable positioning without feedback is acceptable in industrial automation. As a two-phase device, it holds its position magnetically while excitation is maintained, eliminating the need for an external brake in many light-load fixtures.
In continuous operation, the motor can generate a holding torque of 2.15 N·m, allowing clamps or lead-screw loads to remain stationary once pulses stop. Each full step advances the shaft by 1.8° per step, so 200 pulses complete one revolution and enable straightforward angle calculations in control software. The copper windings draw 2 A per phase at standstill. Combined with a phase resistance of 2.5 Ω per phase, this current produces about 10 W of static copper loss per phase, which must be considered when planning heat dissipation. The rotor inertia of 1.45 × 10⁻⁴ kg·m² affects how quickly the axis can accelerate without missing steps.
The laminated stator stack is 92.2 mm long, and the assembled frame weighs 1.5 kg, providing suitable stiffness and mass for midsize belt drives. Electrical response benefits from a per-phase inductance of 7.2 mH per phase, which limits the rate of current change so chopper drives can regulate current without excessive ripple. A square 82.55 mm mounting face has a 69.6 mm bolt circle and 5.35 mm diameter through holes for attachment to compatible NEMA 34 gearheads. A 73.025 mm diameter pilot register centers the housing on the mounting surface. The ground steel shaft measures 9.5 mm in diameter and extends 28 mm beyond the front flange for coupler engagement. The winding leads are arranged for unipolar drive, allowing compatible controls to energize each coil section independently.
