103H7123-0740 Sanyo Denki
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The Sanyo Denki 103H7123-0740 is part of the StepSyn Stepping Motors series and features a flange size of 56 millimeters square with a circular shaft diameter of 6.35 millimeters. This stepping motor has a basic step angle of 1.8 degrees, a holding torque of 0.78 Newton meters, and a rated current of 3 Amps per phase. It uses lead wire connections, measures 53.8 millimeters in length, and weighs 0.65 kilograms.
Internal Product Review
The 103H7123-0740 is a Sanyo Denki StepSyn stepping motor with a 1.8° basic step angle and unipolar winding. A 0.78 N·m holding torque paired with 3 A/phase rated current gives this motor a strong balance of positioning stability and drive responsiveness. Excellent choice for motion systems requiring consistent step control and dependable torque retention.
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Product Description:
The 103H7123-0740 stepping motor is manufactured by Sanyo Denki as part of the StepSyn Stepping Motors series. It fits motion stages, light packaging equipment, and laboratory instruments where simple open-loop position control is acceptable. By translating command pulses into fixed angular increments, the unit supplies predictable torque and removes the need for shaft encoders in many low-to-medium-power automation tasks. Its hybrid construction combines permanent-magnet and variable-reluctance elements to increase output density.
The motor advances in discrete steps of 1.8°, establishing its basic resolution per input pulse. A holding torque of 0.78 N·m keeps fixtures in position when the windings are energized. Each phase draws 3 A per phase, so the drive must source that current without exceeding thermal limits. The coil inductance is 1.58 mH per phase, allowing a rapid current rise that supports high microstepping rates. The motor has a 56 mm square frame, and a 38.1 mm pilot diameter centers the housing against gearboxes or mounting plates. The phase resistance is 0.77 Ω, producing 6.9 W of copper loss at the rated current. The windings use a unipolar pattern with six leads. An attached lead-wire harness uses AWG 22 conductors, providing adequate current capacity while remaining flexible for routing.
The overall body length is 53.8 mm, keeping the motor short enough for compact enclosures. The assembly weighs 0.65 kg, allowing linear stages to accelerate without large counterbalances. The rotor inertia is 0.21 × 10⁻⁴ kg·m², enabling moderate start-stop cycles without overshoot when acceleration profiles are properly tuned. Output torque passes through a 6.35 mm diameter circular shaft, so couplings must use set screws or clamp collars for slip-free engagement. The compact housing can fit indexing feeders, optical platforms, and small gantry axes where installation space is limited. Its electrical arrangement also permits use with compatible unipolar stepper drives that can provide the required phase current.
