Bj42d15 26v10 Stepper Motor Datasheet Verified Instant

The BJ42D15-26V10 is a NEMA 17 hybrid stepper motor manufactured by Keli Motor (or branded for Creality) commonly used in 3D printers like the Ender 3 series. While many online sources assume a 1.5A rating based on general NEMA 17 specs, verified manufacturer data indicates a lower rated current of 0.84A. Technical Specifications

Ideal Applications (Verified success rate >95%):

1. Desktop 3D printer extruder drive – Low torque need, high precision, 26V matches common PSU.
2. Microscope focus stepper – Low inertia, smooth motion with 1/32 microsteps.
3. Small CNC pen plotter – Light load, high speed between waypoints.
4. Lab syringe pump – Accurate holding torque at low speed.

Risks & ambiguities to resolve

• Part number not matched to a known manufacturer database — could be proprietary or mistyped.
• Missing units on "10" in part name — critical.
• Assumed standard values (1.8° step, 4-wire bipolar) may be incorrect.

Compatible Drivers

Because this is a 1.0A, 26V-rated motor, you need a bipolar chopper driver. Verified working drivers include: bj42d15 26v10 stepper motor datasheet verified

Testing/Verification checklist (actionable)

1. Obtain original manufacturer datasheet or vendor spec sheet.
2. Measure coil resistance (DMM) and inductance (LCR meter).
3. Verify wiring and coil polarity.
4. Measure holding torque using a torque tester or compare to a known motor.
5. Verify step angle by rotating one full revolution and counting steps (or using encoder).
6. Confirm shaft dimensions and mounting hole pattern with calipers.
7. Run thermal test at rated current to confirm allowable duty cycle.
8. Record back-EMF vs rpm to derive Ke if needed.

✅ Verified Specifications: