103-4902-0650 Sanyo Denki
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The Sanyo Denki 103-4902-0650 is a stepping motor from the StepSyn Stepping Motors series. It features a frame size of 39 mm square and a step angle of 0.9 degrees per step. The motor offers a holding torque of 0.032 Newton-meters and has a rated current of 0.4 Amps per phase.
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Product Description:
The 103-4902-0650 stepping motor is produced by Sanyo Denki and belongs to the StepSyn Stepping Motors series. It is a permanent-magnet hybrid device that converts command pulses into incremental rotary motion for pick-and-place heads, syringe pumps, or miniature XY tables in industrial automation. By delivering precise open-loop positioning without an encoder, the motor simplifies the control architecture and reduces wiring in compact machines where space and power availability are constrained. Its low thermal load also eases driver design in densely populated enclosures.
The rotor advances by 0.9° per step, providing 400 full-step positions per revolution for fine motion resolution. A holding torque of 0.032 N·m keeps the shaft locked when the windings are energized, supporting small fixtures or lead screws against back-driving. Each phase is rated at 0.4 A per phase, so the motor can be driven directly from low-power transistor arrays. The copper windings have a resistance of 16.5 Ω per phase, resulting in a nominal drive voltage of approximately 6.6 V. The coil inductance is 3.5 mH per phase; this limits the rate of current change and should be considered when selecting chopper frequencies. The electrical circuit uses a center-tapped coil arrangement that accommodates simple driver topologies.
The square housing measures 39 mm across and has a body length of 16.8 ± 0.2 mm, allowing the motor to fit inside instruments and miniature robot wrists. Four mounting bosses on 31 ± 0.25 mm hole centers accept four M3 × 0.5 screws for flange alignment. With a mass of 0.135 kg, the motor adds little inertial load to compact mechanisms. The shaft has a diameter of 5 mm with a tolerance of −0.013 mm and projects 18 ± 0.5 mm from the housing, enabling direct pulley coupling. Rotor inertia is 0.009 × 10⁻⁴ kg·m², supporting fast acceleration. Power reaches the coils through UL1430 AWG28 leads with a minimum length of 200 mm. The coil set uses a unipolar topology, permitting operation in half-winding or full-winding drive modes.
