103H7123-1745 Sanyo Denki
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The Sanyo Denki 103H7123-1745 is a stepping motor from the StepSyn Stepping Motors series, featuring a step angle of 1.8 degrees and a frame size of 56 by 56 millimeters. The motor weighs 0.65 kilograms, has a protection grade of IP40, and operates at a maximum altitude of 1000 meters. Its thermal class is rated Class B with a winding temperature rise of 80 K and insulation resistance of at least 100 megaohms.
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Product Description:
The 103H7123-1745 is a two-phase stepping motor produced by Sanyo Denki for the StepSyn Stepping Motors series. In positioning tables, pick-and-place heads, and small indexing devices, it converts pulse trains from a driver into precise rotor increments, delivering open-loop motion control without feedback. By turning electrical pulses into controlled angular steps, the unit provides repeatable shaft positioning for light industrial automation.
The square mounting face measures 56 × 56 mm, matching common NEMA 23 brackets, while the front pilot measures 38.1 mm in diameter to center the motor in gearheads or couplings. Its body length is 53.8 mm, so enclosure designers can account for its depth inside compact machines. Each control pulse moves the shaft by 1.8°, giving 200 full-step positions per revolution and enabling finer motion through microstepping drives. The internal windings withstand a dielectric test of 1000 VAC, and the coil insulation has a resistance of at least 100 MΩ, helping prevent leakage current when the frame is grounded. The motor can be installed at elevations up to 1,000 m without derating, covering most plant locations.
At just 0.65 kg, the rotor-stator assembly imposes limited inertial load on linear slides and small belt transmissions. The housing meets IP40 protection, which prevents access to hazardous internal parts with wires and blocks solid objects measuring 1 mm or larger; the motor should be mounted in a clean enclosure if liquid exposure is expected. The insulation system meets Class B (+130 °C) requirements, and the specified 80 K winding temperature rise indicates the maximum permissible coil temperature increase above ambient during operation at continuous rated current. Adequate airflow and heat sinking help keep the motor within its insulation limits during intermittent or continuous duty cycles.
