• 2 phase, NEMA11 frame size
• 30 mm long
• 0.67 A phase current
• 0.065 N.m holding torque
• 5 mm shaft size
• Built with high quality materials.High precision, low motor heating, and low vibration。
The 28J1830-407 is a NEMA11 Stepper Motor in the 28 mm micro frame, 30 mm long, delivering 0.065 N·m at 0.67 A per phase with a 5 mm shaft. It is engineered for micro-level motion inside compact scientific instruments, where controlled open-loop stepping must fit inside a benchtop or handheld device.
Analytical instruments, micro pump drives, and laboratory mechanisms require position control in fractions of a millimeter. This motor provides that control in a package small enough for densely packed modules. The tiny 28 mm frame fits mechanisms that larger NEMA17 units would overwhelm.
In analytical instruments the motor drives autosampler carousels and valve selectors that must rotate to a precise port and hold it there. Micro pump drives use its small, controlled rotation to meter liquid in precise increments, and optical equipment relies on it to rotate filter wheels and align beam paths. Micro-automation equipment and inspection fixtures step probes or cameras along short rails.
The 0.065 N·m rating limits this motor to very light loads such as guide rails, small rotors, and low-friction mechanisms, so keep the moving mass and friction low. At 0.67 A the drive requirement is modest; choose a microstepping driver that smooths low-speed rotation for precise indexing. Moderate current with a precise air gap keeps heating low, supporting continuous-duty instruments. The 5 mm shaft and NEMA11 interface fit compact brackets and small couplings common to micro-instrument hardware. One advantage of the NEMA11 pattern is standardization: brackets, couplings, and gearheads for the 28 mm frame are widely available, so prototyping time stays short, and for battery-powered analyzers the modest draw also simplifies the power budget.
| Model | 28J1830-407 |
| Phase | 2 |
| Step Angle（deg） | 1.8 |
| Holding Torque(N·m) | 0.065 |
| Rated Current（A） | 0.67 |
| Phase Resistance(ohm) | 5.2 |
| Phase Inductance（mH） | 4.2 |
| Detent Torque（mN·m） | 5 |
| Rotor inertia（g·cm²） | 8 |
| Insulation Class | B |
| Number of Leads | 4 |
| Weight（kg） | 0.16 |
| Length（mm） | 30 |
| Matched Drive | 2DM522-RC/EC 2DM415 |
| Frame Size（NEMA） | 11 |
| Shaft Diameter（mm） | 5 |
| Frame Size(mm) | 28 |
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