Product Description:

The 103H7851-7051 is a five-phase hybrid stepper motor produced by Sanyo Denki within the StepSyn Stepping Motors series. It converts pulsed drive signals into incremental motion for positioning tables, indexers, or metering equipment in automated assemblies. The rotor advances through fixed angular increments, allowing the motor to provide open-loop positional control without a feedback device. This operating method simplifies control wiring in medium-torque applications where the load remains within the motor’s available torque range. Accurate pulse generation from a compatible drive allows repeatable movement between commanded positions.

The motor advances the rotor by 0.72° per step, providing 500 steps per revolution and fine incremental positioning when paired with a microstepping drive. Its five-phase configuration energizes the stator in a staggered sequence that minimizes detent oscillations and improves low-speed smoothness compared with typical two-phase designs. Each coil is rated for 0.75 A per phase, so the connected drive must supply the required current while keeping the coil temperature within its permitted range. The phase inductance is 4.75 mH per phase, which affects current rise time and the torque available at higher pulse rates. The winding resistance is 2.75 Ω per phase, and the resulting copper loss must be transferred through the motor housing and mounting surface. Drive voltage, pulse rate, and current regulation should be selected to support the required acceleration profile without causing excessive winding heat.

The motor provides a holding torque of 0.65 N·m, allowing the energized shaft to resist a moderate rotational load without a separate brake. Its rotor inertia is 0.275 × 10⁻⁴ kg·m², which limits the torque needed to accelerate or decelerate the rotating assembly during rapid indexing. The motor weighs 0.6 kg, helping keep the supported mass manageable when it is installed on compact machinery. Its square mounting face measures 60 mm × 60 mm and aligns with commonly used NEMA 24 mounting arrangements. The single shaft extends from the front of the housing, leaving the rear unobstructed for nearby machine components. Proper alignment of the shaft and coupling helps prevent binding, uneven bearing loads, and positioning errors during repeated motion. The mounting surface should provide firm mechanical support and a suitable path for heat generated by the energized windings.