103H7126-0440 Sanyo Denki
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The Sanyo Denki 103H7126-0440 is a unipolar StepSyn Stepping Motor with a basic step angle of 1.8 degrees and a holding torque of 1.27 Newton meters. This motor features a 56 mm square flange, a shaft diameter of 6.35 mm, and a rated current of 2 Amps per phase. It weighs 0.98 kilograms and uses lead wire connections.
Internal Product Review
The 103H7126-0440 is a Sanyo Denki StepSyn stepping motor with a 1.8° basic step angle and unipolar winding. Rated at 2 A/phase with 1.27 N·m holding torque, the motor offers strong positioning capability and stable step response. Lead wire construction and 4.5 mH/phase inductance make the unit a well-balanced choice for dependable motion control.
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Product Description:
The 103H7126-0440 is a two-phase stepping motor produced by Sanyo Denki for the StepSyn Stepping Motors series. Designed for open-loop positioning tasks, it converts pulse commands from a microstep drive into controlled angular movement. The motor fits machinery that requires repeatable stops without feedback devices, allowing automated tools, laboratory instruments, or light conveyors to index components precisely along programmed paths.
Each full step advances the shaft by 1.8°, so 200 steps complete one revolution; this resolution provides the smallest uncompensated positioning increment available to the controller. At rest with rated excitation, the rotor can resist external loads up to 1.27 N·m, providing suitable holding torque for small belt drives or lead-screw stages. The coils are energized at 2 A per phase, and their unipolar windings simplify driver circuitry by providing center-tapped leads. The motor has a phase inductance of 4.5 mH per phase, which limits the rate of current change during rapid step sequences. Its phase resistance is 2 Ω per phase, which determines steady-state copper loss. A rotor inertia of 0.36 × 10⁻⁴ kg·m² supports quick acceleration without requiring large current margins.
The square mounting face follows the NEMA 23 pattern and uses a 56 mm square flange. Mounting holes with a diameter of 4.5 mm are arranged on a 47.14 mm pitch, while a 38.1 mm pilot centers the frame against adjoining brackets. The body has an overall length of 75.8 mm, allowing installation in compact enclosures. The steel rotor and laminated stator bring the total mass to 0.98 kg. A milled shaft with a diameter of 6.35 mm carries pulleys or couplings directly and is supported by ball bearings sized for the rated thrust. Teflon-insulated lead wires exit from the rear, permitting straightforward cabinet routing without detachable connectors and keeping the motor’s entry path free of additional hardware.
