103H7124-0740 Sanyo Denki
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The Sanyo Denki 103H7124-0740 is a stepping motor from the StepSyn Stepping Motors series with a flange size of 56 mm square and a shaft diameter of 6.35 mm. It features a holding torque of 0.98 Newton-meters, a rated current of 3 Amps per phase, and a step angle of 1.8 degrees per step. The motor has a length of 63.8 mm and weighs 0.8 kilograms.
Internal Product Review
The 103H7124-0740 is a Sanyo Denki StepSyn stepping motor with 0.98 N·m holding torque and a 1.8° step angle. Unipolar wiring and a 3 A/phase rated current support straightforward drive matching and stable indexing in motion applications. A very capable motor for precise positioning duties with dependable stepper performance.
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Product Description:
The 103H7124-0740 is a hybrid stepping motor manufactured by Sanyo Denki within the StepSyn Stepping Motors series. In automated pick-and-place heads, small conveyors, and optical inspection stages, the unit translates pulse commands from a driver into discrete shaft movements that can be counted and controlled without an encoder. This direct micropositioning capability makes it suitable for production equipment requiring consistent speed regulation and indexing accuracy in open-loop motion systems.
The motor advances by 1.8° per step, so 200 full steps complete one revolution; microstepping drivers can further divide this increment for smoother motion. A holding torque of 0.98 N·m keeps loads stationary when pulses stop, allowing clamping forces to be maintained with coil energization alone. Each phase can draw up to 3 A/phase, and the copper windings have a phase resistance of 0.74 Ω/phase; these values determine the voltage that the drive must supply during acceleration. Electrical time constants are influenced by the phase inductance of 1.4 mH/phase, so current rises quickly enough for rapid pulse rates. Unipolar wiring simplifies the driver topology, and the minimum lead length of 305 mm provides adequate reach for board-level connectors. A rotor inertia of 0.245 × 10⁻⁴ kg·m² permits fast start-stop cycles without excessive overshoot.
The square front face measures 56 mm, and the frame has a depth of 63.8 mm, helping the motor fit into compact housings. A mass of 0.8 kg reduces gantry loading while still helping to damp vibration. The shaft has a 6.35 mm ground diameter for direct connection to timing pulleys or flexible couplings. Four through-holes, each with a diameter of 4.5 mm, are positioned on a 47.14 mm pitch to match standard mounting brackets. A 38.1 mm pilot centers the housing for concentric alignment during installation and operation.
