103H6703-0440 Sanyo Denki
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The Sanyo Denki 103H6703-0440 is a stepper motor from the StepSyn Stepping Motors series with a 1.8 degree basic step angle and a holding torque of 0.49 Newton meters. It features a 50 mm square flange, motor length of 51.3 mm, weighs 0.5 kg, and has a rated current of 2 Amps per phase. The motor supports unipolar wiring, uses a lead wire connection, and is built as a 2-phase unit with a circular output shaft.
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Product Description:
The 103H6703-0440 is a two-phase hybrid stepping motor manufactured by Sanyo Denki as part of the StepSyn Stepping Motors series. Designed for compact positioning stages and light conveyor drives, the motor advances its shaft in equal increments when driven by sequenced currents, enabling reliable open-loop motion in industrial automation equipment such as labeling lines, small CNC tools, and semiconductor handlers. It uses a unipolar winding supplied by a dedicated chopper drive, making it suitable for installations where position feedback is unnecessary. The hybrid rotor design combines permanent-magnet and variable-reluctance principles to provide consistent incremental movement under properly controlled phase current.
The basic step angle is 1.8°, so 200 full steps complete one mechanical revolution, while microstepping controllers can produce finer increments. The motor provides a holding torque of 0.49 N·m to keep the shaft stationary while the phases are energized. Each phase is rated for 2 A per phase and has a resistance of 1.6 Ω per phase, which must be considered when selecting a compatible drive. The coil inductance is 3.2 mH per phase, affecting how quickly phase current rises and falls as the stepping frequency increases. The square mounting face measures 50 mm per side, providing a compact interface for installation on a machine frame or mounting plate. Electrical connections are made through integral lead wires, and the center-tapped windings support unipolar operation.
The motor has an overall body length of 51.3 mm, allowing installation inside shallow enclosures and compact positioning assemblies. The rotor and frame have a combined weight of 0.5 kg, which limits the mass added to moving equipment. The shaft supports a radial load of 75 N and a thrust load of 15 N when the applied forces remain within the permitted loading conditions. Its rotor inertia is 0.118 × 10⁻⁴ kg·m², supporting rapid acceleration and deceleration during repetitive start-stop cycles. A round shaft simplifies attachment to timing pulleys, flexible couplings, and similar transmission components. Although the winding is intended for unipolar control, a compatible bipolar drive can operate the motor by using the appropriate winding connections when the application requires a different drive arrangement.
