103H8221-5241 Sanyo Denki
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The Sanyo Denki 103H8221-5241 is a 2-phase stepper motor from the StepSyn Stepping Motors series with a 1.8 degree step angle and a holding torque of 2.74 Newton meters. It features a bipolar winding type, a flange size of 86 mm, and weighs 1.5 kg. The motor operates at a rated current of 6 Amps per phase and has a resistance of 0.3 Ohms per phase.
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Product Description:
The 103H8221-5241 is a stepping motor produced by Sanyo Denki for the StepSyn Stepping Motors series. This two-phase unit converts discrete pulse trains from a controller into incremental shaft movement, allowing indexers, pick-and-place heads, and small gantries to position loads without feedback encoders. The motor is suitable for machinery where fixed step resolution simplifies motion control and energized holding torque is needed to keep a stationary axis from moving. Its square front face aligns with common gearboxes, actuators, and timing-belt pulley assemblies, supporting direct installation in many machine frame designs. The incremental operating principle also supports repeatable positioning when the controller maintains an accurate count of the command pulses sent to the motor.
Mechanical mounting uses a NEMA 34-compatible face with a flange diameter of 86 mm. The shaft turns in increments of 1.8°, allowing controllers to produce predictable angular movement for indexing tasks. The motor provides a holding torque of 2.74 N·m, which is suitable for supporting medium-inertia tables while the windings are energized. The bifilar windings have a phase resistance of 0.3 Ω per phase and accept a rated drive current of 6 A per phase. This electrical combination supports high torque at low speeds while requiring a current-mode driver to control winding current and heat generation. The selected driver should provide two controlled phase outputs and accommodate the motor’s rated current without relying on winding resistance alone to limit current.
The phase inductance is 1.65 mH per phase, allowing current to rise quickly and reducing the delay between winding excitation and torque production. A rotor inertia of 1.45 × 10⁻⁴ kg·m² balances acceleration capability with smooth rotational response during starts and stops. The laminated stack has a length of 62 mm, while the motor has a total mass of 1.5 kg, making it suitable for mounting on relatively light machine frames. Two AWG 22 leads per phase extend at least 305 mm from the housing, providing sufficient length for routing to a nearby junction box or driver connection. The motor uses bipolar wiring, so each phase is driven in both current directions by a dual H-bridge circuit. Its lead arrangement also supports microstepping control, which can reduce vibration and produce finer commanded movement between full-step positions.
