103H8221-5044 Sanyo Denki
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The Sanyo Denki 103H8221-5044 is a 2-phase stepping motor from the StepSyn Stepping Motors series and features a holding torque of 2.74 Newton-meters. It has a frame diameter of 86 millimeters, a mass of 1.5 kilograms, and a step angle of 1.8 degrees per step. The motor operates at a rated current of 2 Amps with a phase resistance of 2.3 Ohms and phase inductance of 14 millihenries.
Internal Product Review
The 103H8221-5044 is a Sanyo Denki StepSyn 2-phase stepping motor with a compact frame suited for controlled motion duty. A 1.8° step angle and 2.74 N·m holding torque support accurate indexing and dependable position holding in automation assemblies. Strong electrical matching from 2 A rated current and 2.3 Ω phase resistance makes this motor a very capable choice for stepper applications.
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Product Description:
The 103H8221-5044 is a two-phase stepping motor produced by Sanyo Denki for the StepSyn Stepping Motors series. It uses a permanent-magnet rotor and sequential winding excitation to advance the shaft in fixed increments, providing precise open-loop motion control without an encoder. Integrators use this motor in feeders, small gantries, and metering pumps where repeatable positioning and low-speed torque are needed from a compact electromechanical actuator.
At full energization, the motor develops 2.74 N·m of holding torque, so the axis resists back-driving when the controller commands standstill. The mechanical resolution is set by the 1.8° per step pitch, which divides one revolution into 200 distinct positions and simplifies gear ratio calculations. Coil temperature rise is managed through a rated phase current of 2 A, which allows suitable drive transistors and power supplies to be selected for continuous operation. Dynamic response is influenced by the coil’s electrical characteristics. A phase inductance of 14 mH limits current slew during rapid step sequences, while the winding’s phase resistance of 2.3 Ω determines copper losses and voltage requirements. These electrical values affect the available speed and torque during microstepping or full-step excitation.
The NEMA 34-style frame measures 86 mm across and has four drilled mounting holes for direct attachment to brackets or gearheads. The single-shaft configuration simplifies the connection of pulleys, lead screws, or feedback devices on the driven end while keeping the opposite face closed. The motor has a total mass of 1.5 kg, which provides enough weight to help damp vibration without placing an excessive load on cantilevered mounts. Its rotor inertia is 1.45 × 10⁻⁴ kg·m², which should be matched to the load inertia so acceleration commands remain within the available pull-out torque during rapid indexing. Proper load matching also helps reduce missed steps when the motor starts, stops, or changes direction quickly.
