Bj42d15 26v10 Stepper Motor Datasheet - Exclusive

The BJ42D15-26V10 is a specific variant of the NEMA 17 hybrid stepper motor, commonly manufactured by Hunan Keli Motor Co. and frequently utilized in Creality 3D printers like the Ender and CR-10 series. This motor is often referred to by its generic dimensions as a "42-34" stepper, denoting its mm faceplate and 34 mm body length. Technical Specifications The "exclusive" datasheet details for the BJ42D15-26V10

align closely with other "BJ42D15" variants used for X, Y, and Z-axis movements: Step Angle: 1.8∘1.8 raised to the composed with power (standard 200 steps per full rotation).

Rated Current: Typically 0.84 A per phase. Some sources note it may be tuned as low as 0.8 A depending on the specific printer application. Holding Torque: Approximately 0.4 N·m (or 2.86 kg·cm). Input Voltage: Rated for a maximum of 24V DC.

Shaft Details: 5 mm diameter, typically a "D-shape" or round shaft with a length of roughly 16 mm. bj42d15 26v10 stepper motor datasheet exclusive

Resistance/Inductance: While specific to exact sub-models, similar 0.84 A Keli motors (like the JK42HS34-0844) show a resistance of ~5.75 Ωcap omega and an inductance of ~9.3 mH. Deciphering the Model Name

The alphanumeric code follows a standardized manufacturer naming convention: BJ: Refers to the manufacturer series (Keli Motor). 42: Indicates the NEMA 17 size (

D15: Specifies the motor length and internal rotor/stator configuration (roughly 34 mm total height). The BJ42D15-26V10 is a specific variant of the

26V10: This suffix often denotes specific winding characteristics or factory-set voltage/current revisions. For example, while widely assumed to be 1.5 A, "26V" series motors are confirmed by manufacturer-reaching enthusiasts to actually be rated at 0.84 A. Practical Application & Safety

In 3D printing contexts, this motor is favored for its balance of high torque and low noise. When configuring stepper drivers (like the A4988 or TMC series), it is critical to set the Vref (Voltage Reference) based on the 0.84 A rating rather than the 1.5 A "default" often found in generic NEMA 17 guides to prevent overheating or motor damage.

For official procurement or detailed bulk drawings, users typically consult the Keli Motor Group Product Page or technical repositories like the Creality Stepper Motor GitHub Gists where enthusiasts compile manufacturer-direct data. 84 A rating? AI responses may include mistakes. Learn more Creality Ender 3 Stock Factory Vref · GitHub Comparison: BJ42D15 26V10 vs

Comparison: BJ42D15 26V10 vs. Generic NEMA 17

2. Electrical Specifications (typical / assumed)

Phase configuration: 2-phase bipolar (4-lead) or 5/6-lead for unipolar variants — confirm before wiring
Resistance per phase: 0.5 Ω (calculated from V/I = 26 V / 10 A = 2.6 Ω; note: real motors usually have low inductance and different winding resistance — measure actual device)
Inductance per phase: 1–10 mH (typical range for 42 mm motors; lower for high-current designs)
Insulation class: Class B or F (typical)
Holding torque: 0.3–0.8 N·m (estimate for high-current NEMA17-style motors)
Detent torque: ≤0.02 N·m (typical)
Coil type: Copper windings, enamel insulated

Note: The simple V/I ratio above is a rough estimate; actual resistance is usually lower and drive uses current-limiting chopper drivers with higher supply voltage.

How to Verify Authentic BJ42D15 26V10

Measure Resistance: Using a multimeter, measure between two adjacent pins on the connector. A genuine unit reads 9.5Ω to 10.5Ω. A fake reads 3.5Ω to 5.0Ω.
Check the Laser Etch: Authentic units have a matte gray finish with a laser etch including "26V10" clearly visible. Fakes use white silk screen printing.
Weight Test: Genuine weight is exactly 140g ± 3g. Fakes using smaller magnets weigh 110g.

C. Space-Constrained Optics (LiDAR / CCTV)

The 42mm frame with a 15mm depth fits into pan-tilt units smaller than a matchbox. The 26V tolerance means it can share a power rail with analog sensor circuits without inducing massive back-EMF noise (thanks to the 10Ω damping resistance).