103-770-6 Sanyo Denki
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The Sanyo Denki 103-770-6 is a stepping motor from the StepSyn Stepping Motors series. It features a basic step angle of 1.8 degrees with a bipolar holding torque of 62 Ncm and a unipolar holding torque of 49 Ncm. The motor has a flange size of 56.4 mm square, weighs 0.54 kg, and operates with a shaft diameter of 6.35 mm.
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Product Description:
The 103-770-6 is a hybrid stepping motor manufactured by Sanyo Denki within the StepSyn Stepping Motors series. It is intended for open-loop indexing and incremental positioning tasks in industrial automation, where a controller sends pulse and direction signals to produce discrete angular movements without requiring encoder feedback. By providing detent positions and repeatable torque, the motor drives small pick-and-place arms, labeling stations, and lead-screw actuators used in packaging and electronic assembly equipment.
The motor has a basic step increment of 1.8° ±0.09°, so 200 full steps complete one mechanical revolution. In a bipolar configuration, the rotor can sustain 62 N·cm of holding torque while the windings receive 1.41 A per phase in parallel, allowing tables or carriages to remain locked when pulses stop. A phase inductance of 9.0 mH limits current rise, affecting the drive’s chopping frequency and attainable slew rate. A copper resistance of 5.1 Ω per phase governs heat generation during continuous operation. When the rotor accelerates, its rotational inertia of 105 × 10⁻⁷ kg·m² affects how quickly motion profiles can ramp without losing synchronization. For unipolar operation, the windings accept 1.0 A, and static torque decreases to 49 N·cm, providing a lower-power operating option.
The motor follows NEMA 23 dimensions, with a square flange face measuring 56.4 mm on each side and an overall body length of 50.8 mm. The front pilot measures 38.1 mm in diameter, while the mounting centers form a 47.14 mm square pattern that aligns with common brackets. A shaft measuring 6.35 mm in diameter extends 20.6 mm beyond the front face to accommodate couplings or pulleys. The motor has a mass of 0.54 kg, which reduces the load placed on lightweight gantries. The generated back electromotive force is 37 V/krpm, so the power stage must absorb this voltage during rapid deceleration. Its compact housing supports installation in confined machinery where accurate indexing and controlled microstepping are required.
