103H7126-5840 Sanyo Denki
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The Sanyo Denki 103H7126-5840 is part of the StepSyn Stepping Motors series and features a holding torque of 1.6 Newton-meters with a step angle of 1.8 degrees per step. This Nema Size 23 motor has a 56 mm flange, is 75.8 mm long, and weighs 0.98 kilograms. It is a bipolar motor rated at 3 Amps per phase with a winding inductance of 4 millihenries and wiring resistance of 0.94 Ohms per phase.
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Product Description:
The 103H7126-5840 is a hybrid stepping motor produced by Sanyo Denki for the StepSyn Stepping Motors series. This NEMA 23 device converts digital pulse trains from an indexer or drive into controlled angular motion, allowing conveyors, positioning tables, or dosing pumps to move in discrete increments without feedback devices. Within an automation cell, it supplies consistent step accuracy while simplifying servo loops, making it a common choice for medium-torque, open-loop axes.
Delivering a holding torque of 1.6 N·m, the motor can maintain shaft position against external loads when energized at standstill, ensuring fixtures remain locked at the commanded index. Its fundamental resolution uses a step angle of 1.8° per step, so 200 full steps complete one mechanical revolution; microstepping drives can further subdivide this increment for smoother motion. Each phase must be supplied with 3 A per phase to reach rated torque, a current level that guides the sizing of the drive transistors and power supply rails. The copper windings have an inductance of 4 mH per phase, which affects current rise time, and a series resistance of 0.94 Ω per phase, which affects resistive heating. The windings are arranged in a bipolar configuration, allowing a four-lead connection to full-bridge drivers. This arrangement supports bidirectional phase current, which is required for controlled stepping in either rotational direction.
The square front face measures 56 mm, enabling direct mounting to standard gearboxes or linear stages without adapter plates. The overall body depth is 75.8 mm, which helps confirm clearance inside compact enclosures. With a mass of 0.98 kg, the rotor-stator assembly limits the added load on lightweight gantries while still carrying the magnetic stack required for its torque class. Dynamic response is aided by a rotor inertia of 0.36 × 10^-4 kg·m², balancing move responsiveness against load damping during high-speed start-stop sequences. The motor can therefore accelerate through commanded step sequences while maintaining the rotational stability needed for repeatable positioning. Proper drive-current control also helps manage winding heat during extended holding periods and repetitive machine cycles.
