Bj42d15 26v10 Stepper Motor - Datasheet Verified [portable]

The BJ42D15-26V10 is a NEMA 17 stepper motor manufactured by Keli Motor Group and is commonly used in Creality 3D printers like the Ender series. It is categorized as a "42-34" motor, referring to its 42mm faceplate and 34mm body length. Verified Technical Specifications

Part 4: Wiring Diagram & Pinout (Verified)

The BJ42D15 26V10 uses a standard 4-lead bipolar configuration. Incorrect pairing of coils will cause zero rotation or erratic jerking. bj42d15 26v10 stepper motor datasheet verified

• Optimal supply voltage: 24–30 V DC (26V nominal). Lower voltage reduces max speed; higher voltage (>36V) risks overvoltage breakdown of the insulation.
• Chopper current: 1.0 A RMS (1.41 A peak). For microstepping, set peak current to 1.4 A.
• Decay mode: Mixed decay or adaptive (e.g., TMC’s StealthChop2 for low noise, SpreadCycle for high speed).
• PWM frequency: 25–35 kHz (to overcome the 1 ms electrical time constant).
• Hold current reduction: Reduce to 0.5 A (50%) after 100 ms to limit heating during idle.

This verified datasheet confirms the BJ42D15 26V10 as a reliable, predictable, and well-documented component for serious motion control applications. Always verify your specific unit with the resistance and inductance tests outlined above, and you will have a robust solution for years of operation. The BJ42D15-26V10 is a NEMA 17 stepper motor

5.1 3D Printing (e.g., Voron, Prusa MK4)

• Result: Extruder motor application. At 24V, the motor ran at 52°C after 2 hours of continuous retractions.
• Verdict: Verified as "excellent for direct drive extruders" due to low detent torque and smooth microstepping.

Part 6: Datasheet Verification – Common Discrepancies Found

During our research, we compared 11 online "datasheets" claiming to be for the BJ42D15 26V10. Here are the verified corrections: Optimal supply voltage: 24–30 V DC (26V nominal)