103H5505-7040 Sanyo Denki
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The Sanyo Denki 103H5505-7040 is part of the StepSyn Stepping Motors series and operates as a 5-phase stepping motor with a step angle of 0.72 degrees per step and a holding torque of 0.127 newton-meters. It has a rated current of 0.75 amps per phase, a winding resistance of 1.45 ohms per phase, and features a 42 x 42 mm flange size. The motor weighs 0.23 kilograms and uses AWG26 wire gauge with a minimum lead length of 300 mm.
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Product Description:
The 103H5505-7040 stepping motor is manufactured by Sanyo Denki as part of the StepSyn Stepping Motors series. This hybrid unit is designed for open-loop positioning tasks in automated equipment, where each incoming pulse rotates the shaft by a fixed increment for accurate index control. Its compact square frame suits small pick-and-place stations, laboratory instruments, and miniature conveyors that require repeatable angular motion without feedback sensors.
The step angle is 0.72° per step; at this resolution, 500 full steps produce a complete revolution, allowing fine positioning of attached mechanisms. The stator has a five-phase configuration, so successive phase excitation produces smoother torque and lower resonance than two-phase motors of a similar size. Each phase draws a rated current of 0.75 A per phase, which supports the selection of an appropriate microstep driver and accurate assessment of thermal margins. The coil resistance is 1.45 Ω per phase, indicating the voltage required to reach the nominal current and the amount of resistive heat that must be dissipated. When the windings are energized while the rotor is stationary, the motor can resist an external load with a holding torque of 0.127 N·m.
Mechanical integration is simplified by a square flange measuring 42 × 42 mm, with mounting holes on 31 ± 0.25 mm centers and four M3 threads with a 0.5 mm pitch. The 22 mm pilot diameter has a −0.05 mm tolerance, providing concentric alignment with gearheads or mounting brackets, while the rotor inertia of 0.03 × 10⁻⁴ kg·m² supports rapid acceleration. The motor has a mass of 0.23 kg, reducing the load placed on sliding or telescopic stages. Power is transmitted through a ground shaft with a diameter of 5 mm that extends 15 mm beyond the front face. The electrical leads use AWG 26 conductors and extend at least 300 mm. The windings have a phase inductance of 1.2 mH per phase, which affects the current rise time when the motor is operated by a chopper drive.
