Product Description:

The 103-815-7 is a two-phase hybrid stepping motor produced by Sanyo Denki for the StepSyn Stepping Motors series. It advances the rotor in discrete increments so automated equipment can maintain repeatable linear or rotary positioning without feedback devices. The motor is typically mounted to small transfer axes, labeling heads, or metering pumps where digital pulse trains from a microstepping drive translate directly into controlled shaft rotation.

Its fundamental step angle of 1.8°/step provides a baseline resolution of 200 full steps per revolution, allowing precise incremental moves when used with common microstepping drives. When the stator windings are energized with a unipolar current of 4.6 A, the motor develops a holding torque of 2.75 N·m; this static torque is sufficient to hold light vertical loads without mechanical brakes. Electrical excitation remains modest because of a winding rating of 2.5 VDC, so full current can be achieved with compact chopper drives that minimize heat dissipation. Under these electrical conditions, the rotor can reach a theoretical acceleration of 30,500 rad/s², making the device suitable for short travel strokes that demand rapid start-stop cycles.

The electrical time constants that govern microstepping smoothness are based on a phase resistance of 0.55 Ω and a phase inductance of 2.5 mH; together, these values allow high current slew rates while keeping eddy-current losses modest. Back electromotive force is limited to 44 V/Krpm, so the generated voltage remains manageable even at elevated rapid-traverse speeds. Dynamic performance also depends on the rotor’s physical characteristics: its moment of inertia is 1.12 × 10⁻⁴ kg·m², and the assembly mass is 2.5 kg, both of which support responsive direction changes without excessive drive sizing. An IP43 enclosure protects against solid objects larger than 1 mm and water sprayed at angles of up to 60 degrees from vertical, allowing installation inside general-purpose machine frames.