103H8221-5141 Sanyo Denki
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The Sanyo Denki 103H8221-5141 is a bipolar stepper motor from the StepSyn Stepping Motors series with a holding torque of 2.74 N·m and motor size of 86 mm. It has a rated current of 4 A per phase, a phase resistance of 0.6 ohms per phase, and features a single 12 mm shaft. The motor has a mass of 1.5 kg, an external length of 62 mm, and a step angle of 1.8 degrees per step.
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Product Description:
The 103H8221-5141 is a hybrid stepping motor manufactured by Sanyo Denki for its StepSyn Stepping Motors series. In industrial automation, this motor provides discrete angular positioning to index conveyors, actuate vision stages, or meter fluid pumps where closed-loop feedback is not mandatory. By advancing a fixed angle each time its coils are energized, it converts digital pulse trains from a drive or PLC into repeatable mechanical motion that can be synchronized with broader machine sequences.
The electrical section uses a bipolar coil topology with two phases, allowing full-bridge drivers to reverse current and maximize flux density. Each phase is rated for 4 A/phase and has a resistance of 0.6 Ω/phase; these values help determine the drive settings required to reach nominal torque. Dynamic response is influenced by a phase inductance of 3.5 mH/phase, which governs current rise time during step transitions. When excitation is steady, the rotor delivers a holding torque of 2.74 N·m, sufficient to keep load axes stationary against moderate belt or gear backlash. The rotor inertia is 1.45 × 10⁻⁴ kg·m², allowing suitable pulse rates to be calculated for target acceleration and speed profiles without missed steps.
The square frame measures 86 mm across and extends 62 mm in length, giving the motor a compact envelope that fits standard NEMA 34 mountings. Its total mass is 1.5 kg, contributing to thermal stability and damping while remaining light enough for moving-gantry platforms. Power is transferred through a shaft with a diameter of 12 mm that projects 30 mm from the front face. The single-shaft design simplifies connection to pulleys or flexible couplings on linear stages. Each full command pulse advances the rotor by 1.8°/step, and the four-wire lead set matches typical bipolar drive terminals while keeping cabinet wiring straightforward.
