103H7121-0117 Sanyo Denki
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The Sanyo Denki 103H7121-0117 is a 2-phase stepper motor from the StepSyn Stepping Motors series with a basic step angle of 1.8 degrees and a holding torque of 0.39 Newton-meters. It features internal unipolar wiring, a 6-pin plug connector, and a dual-shaft circular output. The motor has a flange size of 56 by 56 millimeters and operates at 1 amp per phase, with a mass of 0.47 kilograms.
Internal Product Review
The 103H7121-0117 StepSyn stepping motor from Sanyo Denki delivers precise positioning with a 1.8° basic step angle and a holding torque of 0.39 N·m. Featuring a 6-pin plug connector and dual shaft configuration, this model supports versatile integration in motion control systems. Its reliable performance makes it a strong choice for applications demanding accuracy and stability.
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Product Description:
The 103H7121-0117 is a stepping motor built by Sanyo Denki within the StepSyn Stepping Motors series. It is a two-phase hybrid unit intended for incremental positioning, index tables, and light pick-and-place axes where repeatable angular moves are required without closed-loop feedback. The motor uses a dual-shaft design with circular shaft ends, so one end can carry an encoder while the other end couples directly to the load. This arrangement supports applications that need simple pulse-based control and optional secondary feedback hardware.
The rotor advances in discrete increments of 1.8°, giving 200 full steps per revolution and simplifying pulse-based motion profiles. A holding torque of 0.39 N·m keeps the shaft locked when coils are energized, which is enough to resist moderate belt or lead-screw back-drive. Each phase draws 1 A/phase, so the drive electronics can be sized for low current while still producing full torque. Mechanical integration is aided by the square 56 × 56 mm flange that matches NEMA 23 hole patterns, and the compact rotor carries only 0.1×10⁻⁴ kg·m² of inertia, allowing quick acceleration when pulse rates increase. Internally, the windings are arranged in unipolar format, and the six leads support either unipolar or bipolar drive topologies for compatibility with different controllers.
The motor weighs 0.47 kg, so it can be mounted on moving axes without adding excessive load to the carriage. Reliable service is supported from -10 to +50 °C and in 20 to 90% relative humidity, enabling use in production cells that lack full climate control. Field wiring is straightforward because the six conductors terminate in a 6-pin plug, and the lead count of 6 keeps phase pairing clear. The rear shaft can also accept auxiliary hardware when the application calls for added position monitoring or manual adjustment.
