103H7121-5040 Sanyo Denki
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The Sanyo Denki 103H7121-5040 is a 2-phase stepping motor from the StepSyn Stepping Motors series. It features a holding torque of 0.39 Newton meters, a body length of 41.8 millimeters, and a flange size of 56 square millimeters. The motor weighs 0.47 kilograms and supports a rated current of 2 Amps per phase with a step angle of 1.8 degrees per step.
Internal Product Review
The 103H7121-5040 is a Sanyo Denki 2-phase stepping motor from the StepSyn series with a bipolar winding. A 1.8° step angle and 0.39 N·m holding torque support precise indexing and stable low-speed positioning in motion applications. Rated at 2 A/phase with 1.9 mH/phase inductance, the motor offers clean electrical matching for responsive drive tuning.
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Product Description:
The 103H7121-5040 is a two-phase stepping motor produced by Sanyo Denki for the StepSyn Stepping Motors series. It converts discrete drive pulses into precise angular movement for indexers, pick-and-place heads, and other position-controlled axes in industrial automation. Its compact dimensions and standard mounting interfaces allow the motor to fit existing motion stages where incremental, open-loop control is acceptable. The two-phase design supports predictable movement when paired with a compatible bipolar stepping motor drive.
The motor has a NEMA 23-compatible square flange measuring 56 mm across. Its 47.14 mm mounting-hole pitch and 38.1 mm pilot diameter keep the motor centered and secure on gearboxes or bearing blocks. The single-ended shaft protrudes 20.6 mm to provide space for a coupling. Each full drive pulse advances the rotor by 1.8° per step, while the laminated core has a rotor inertia of 0.1 × 10⁻⁴ kg·m² for responsive and stable movement. A holding torque of 0.39 N·m resists back-driving when the coils are energized, supporting light to medium loads. The bipolar windings operate at a rated current of 2 A per phase. A per-phase inductance of 1.9 mH influences current rise time and allows microstepping controllers to regulate current without excessive overshoot.
The short 41.8 mm body helps reduce the required installation depth inside compact enclosures. A total mass of 0.47 kg limits the additional load placed on gantries and rotary tables. Electrical losses remain moderate because each winding has a resistance of 0.65 Ω per phase, making the motor suitable for common 24–40 V chopper drives. Motion is transferred through a ground steel shaft with a diameter of 6.35 mm, which accepts standard clamp hubs and pulleys. The bipolar winding arrangement has no center taps, reducing the number of required connections while supporting full-bridge drive circuits. This winding arrangement also allows both phases to be controlled directly for accurate positioning and smooth low-speed operation.
