Product Description:

The 103H7821-1740 is a hybrid stepping motor supplied by Sanyo Denki within the StepSyn Stepping Motors series. The device converts digital pulse trains from an indexer or microcontroller into incremental shaft rotation, making it suitable for pick-and-place heads, small gantries, and precision indexing tables in industrial automation. As part of motion subsystems, the motor provides discrete angular steps that allow open-loop position control without an encoder, reducing system complexity while still achieving the repeatability required by semiconductor handlers and laboratory equipment.

Each full step of the rotor corresponds to 1.8°, so two hundred command pulses complete one mechanical revolution. A holding torque of 0.88 N·m keeps the load in position when current is maintained, preventing back-driving in belt or lead-screw stages. The stator windings are rated for 4 A/phase, allowing high dynamic acceleration when driven by a chopper drive. Copper resistance is 0.35 Ω/phase, which limits I²R losses and determines the required supply voltage. With a low inductance of 0.8 mH/phase, current rises quickly, so midrange resonance can be suppressed through higher microstepping rates and fast current-decay profiles. Rotor inertia is 0.275 × 10⁻⁴ kg·m², providing a modest load-to-motor inertia ratio for lightweight pick elements.

The square mounting face follows the NEMA 24 pattern with a flange of 60 mm and a spigot diameter of 36 mm that centers the frame on gearbox flanges. The overall body depth is only 44.8 mm, helping the motor fit into multi-axis assemblies inside narrow enclosures. The motor weighs 0.6 kg, reducing the moving mass of gantry systems where weight can affect throughput. Power is delivered through a connector-style header that simplifies cable changes. The 8 mm D-shaped shaft transmits torque directly to couplings, while the bipolar wiring arrangement supports standard dual-H-bridge drivers.