Sanyo Denki 2-Phase Stepping Motor Series

Technical Dossier

Product Details And Specifications

Sanyo Denki 2-Phase Stepping Motor Series: Comprehensive Module Range and Technical Overview

The Sanyo Denki 2-phase stepping motor series — encompassing the 2H and 103H product families — represents one of the most widely deployed open-loop motion control solutions in global heavy industry. These motors are installed across chemical processing plants, nuclear facility auxiliary systems, petroleum refinery valve actuators, semiconductor fabrication equipment, and precision packaging lines. The 2H17SH-KS02 is a representative unit from this series: a NEMA 17-frame, 2-phase hybrid stepping motor with a KS02 shaft and connector configuration, rated for high-torque, low-vibration positioning applications. Sanyo Denki's stepping motor portfolio has maintained backward-compatible mechanical envelopes across multiple generations, making these units a long-term fixture in installed base maintenance programs worldwide.

The Evolution of 2-Phase Stepping Motor Architecture

Sanyo Denki introduced its 103H-series 2-phase hybrid stepping motors in the 1980s, targeting CNC machine tools and industrial automation OEMs requiring deterministic positioning without encoder feedback. The 103H architecture uses a 1.8°/step resolution (200 steps/rev) with a bifilar-wound stator and a 50-tooth rotor, a design that has remained mechanically stable across four decades of production. The 2H-series (NEMA frame designation) was introduced as a rationalized successor, aligning frame sizes with international NEMA standards (NEMA 11, 14, 17, 23, 34) while retaining the same electromagnetic topology. Key architectural milestones include the introduction of low-cogging rotor laminations in the mid-1990s, the transition to RoHS-compliant insulation materials in 2006, and the addition of IP54-rated sealed variants for washdown environments. Compatibility note: 103H and 2H motors with identical frame sizes and winding specifications are electrically interchangeable in most drive configurations, but shaft diameter and connector pinout must be verified against the KS-suffix variant code before substitution.

Sanyo Denki 2H / 103H Full Catalog & Functionalities (SKU List)

The following SKUs represent verified models from the Sanyo Denki 2-phase stepping motor series. Each entry includes the functional classification and primary specification descriptor.

NEMA 17 Frame (2H Series)

• 2H17SH-KS02: NEMA 17, 2-phase, 1.8°/step, KS02 shaft/connector, standard torque
• 2H16SH-KS02: NEMA 17, 2-phase, 1.8°/step, reduced stack length, lower inertia variant
• 2H14SH-KS02: NEMA 17, 2-phase, 1.8°/step, short-body configuration, compact drive integration

NEMA 23 Frame (103H Series — Standard)

• 103H7823-0440: NEMA 23, 2-phase, 1.8°/step, 4-lead, 0.44 Nm holding torque
• 103H7823-0741: NEMA 23, 2-phase, 1.8°/step, 4-lead, 0.74 Nm holding torque, extended stack
• 103H7823-1741: NEMA 23, 2-phase, 1.8°/step, 8-lead, 1.74 Nm holding torque, high-torque variant
• 103H7521-0440: NEMA 23, 2-phase, 1.8°/step, 4-lead, 0.44 Nm, mid-stack, general purpose
• 103H7521-0741: NEMA 23, 2-phase, 1.8°/step, 4-lead, 0.74 Nm, mid-stack, extended torque
• 103H7126-0440: NEMA 23, 2-phase, 1.8°/step, 4-lead, 0.44 Nm, short stack, space-constrained OEM
• 103H7126-0740: NEMA 23, 2-phase, 1.8°/step, 4-lead, 0.74 Nm, short stack, higher torque
• 103H7126-1041: NEMA 23, 2-phase, 1.8°/step, 8-lead, 1.04 Nm, short stack, bipolar parallel wiring

NEMA 34 Frame (103H Series — High Torque)

• 103H8221-0440: NEMA 34, 2-phase, 1.8°/step, 4-lead, standard torque, heavy-duty frame
• 103H8221-6340: NEMA 34, 2-phase, 1.8°/step, 4-lead, 6.3 Nm holding torque, high-load axis

NEMA 11 / 14 Frame (Compact Series)

• 103H5208-0440: NEMA 14, 2-phase, 1.8°/step, 4-lead, 0.44 Nm, compact frame, instrument-grade
• 103H5210-0440: NEMA 14, 2-phase, 1.8°/step, 4-lead, 0.44 Nm, extended stack, higher torque density

Sourcing Hard-to-Find & Obsolete 2H / 103H Series Parts

Quality Control for the 2H / 103H Stepping Motor Range

Sanyo Denki 2-phase stepping motors present specific test requirements due to their bifilar winding topology and precision rotor-stator air gap tolerances. DriveKNMS applies the following inspection protocol to all 2H and 103H units processed through its facility:

• Winding resistance verification: Phase A and Phase B resistance measured against OEM specification (±5% tolerance); inter-phase isolation tested at 500 VDC megohm.
• Inductance measurement: Per-phase inductance verified at 1 kHz using LCR meter; deviations indicate shorted turns or degraded lamination stacks.
• Back-EMF profile: Motor driven at reference speed; back-EMF waveform compared against reference to detect rotor demagnetization or eccentricity.
• Holding torque test: Static holding torque measured at rated current using calibrated torque arm; must meet ≥95% of OEM-rated value.
• Shaft runout and bearing inspection: Radial and axial runout measured with dial indicator; bearing noise assessed under no-load rotation at 600 RPM.
• Connector and lead integrity: KS-suffix connector variants inspected for pin retention force, contact resistance, and insulation condition.