103H7121-0410 Sanyo Denki
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The Sanyo Denki 103H7121-0410 is a StepSyn Stepping Motor with a 1.8 degree basic step angle and a holding torque of 0.39 Newton meters. This lead wire type motor features a 56 mm square flange, 41.8 mm length, and dual circular output shafts with a diameter of 6.35 mm. It has a motor mass of 0.47 kilograms and is rated for 2 Amps per phase with unipolar wiring.
Internal Product Review
The 103H7121-0410 is a Sanyo Denki StepSyn stepping motor with a precise 1.8° basic step angle and 0.39 N·m holding torque. Lead wire type connection and unipolar wiring support straightforward integration into motion-control assemblies. A dual-shaft arrangement with low rotor inertia supports responsive performance in indexing and positioning duties.
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Product Description:
The 103H7121-0410 stepping motor is produced by Sanyo Denki as part of the StepSyn Stepping Motors series. It is intended for open-loop positioning duties where small incremental moves must be repeated with mechanical precision, such as in label printers, laboratory pipetting stages, or miniature conveyor drives. The motor translates digital pulse sequences from a microstep drive into controlled rotation, allowing integration into machines that require a compact size and moderate holding torque.
Its basic step increment is 1.8°, so 200 full steps complete one mechanical revolution, and microstepping controllers can interpolate finer positions from that reference. A holding torque of 0.39 N·m permits the motor to maintain the load position when power is applied but motion is idle, which is adequate for light linear slides or small gearheads. Each phase is energized at 2 A per phase, and the copper windings have a resistance of 1.25 Ω per phase. These electrical values determine the drive voltage requirement and power dissipation. Dynamic current change is limited by a coil inductance of 1.9 mH per phase, which influences midrange resonance behavior. The unit uses unipolar wiring with a lead-wire connection, simplifying its connection to common five- or six-wire drives.
The mechanical envelope matches the NEMA 23 mounting pattern, and its square flange measures 56 mm per side. The mounting holes are spaced on a 47.14 mm pitch, allowing installation in compatible standard frames. A pilot diameter of 38.1 mm centers the housing accurately. The body has an overall length of 41.8 mm, conserving axial space, while the assembled mass is 0.47 kg, which helps limit the load on moving gantries. A dual-shaft arrangement provides a circular output at both ends, and each shaft has a diameter of 6.35 mm for connection to pulleys or encoders without adapters. The low rotor inertia of 0.1 × 10⁻⁴ kg·m² supports rapid start-and-stop motion while limiting reflected torque spikes.
