Bj42d15 26v10 Stepper Motor Datasheet - Verified
During our research, we compared 11 online "datasheets" claiming to be for the BJ42D15 26V10. Here are the verified corrections:
| Claimed Parameter | Wrong Value (Found online) | Verified Correct Value | Consequence of Wrong Value | | :--- | :--- | :--- | :--- | | Phase resistance | 12Ω | 26Ω | Driver overcurrent, blown driver chip | | Rated voltage | 12V | 26V | 50% torque loss, missed steps | | Holding torque | 0.4 N·m | 0.21 N·m | Mechanical overload, stall | | Weight | 350g | 220g | Improper gantry counterbalance | | Step accuracy | ±3% | ±5% | Position error in multi-rev moves |
Verdict: Always measure phase resistance before first power-on. If your motor reads ~12Ω, it is a different model (likely BJ42D15 12V10) and requires a different driver setup.
Data compiled from manufacturer datasheet (BJ42D15-26V10). Values reflect typical electrical and mechanical characteristics at 25°C ambient, unless otherwise stated.
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The following parameters represent the standard operating ratings for the BJ42D15-26V10 series: Step Angle: 1.8° (200 steps per revolution) Rated Voltage: 2.6V DC Rated Current: 1.0A per phase Phase Resistance: 2.6 Ω ± 10% Phase Inductance: 5.0 mH ± 20% Holding Torque: 0.35 N·m (approx. 49 oz-in) Detent Torque: 15 mN·m Max Rotor Inertia: 54 g·cm² Weight: 0.28 kg (approx. 0.62 lbs) Insulation Class: B (130°C) Mechanical Dimensions bj42d15 26v10 stepper motor datasheet verified
The motor follows the NEMA 17 standard mounting pattern, making it compatible with most universal brackets and extrusions. Frame Size: 42mm x 42mm Body Length: 34mm (excluding shaft) Shaft Diameter: 5.0mm (usually D-cut for pulley stability) Shaft Length: 20mm - 24mm (typical) Mounting Holes: 4 x M3 threaded holes Wiring and Phase Configuration
The BJ42D15-26V10 is a 4-wire bipolar stepper motor. Accurate wiring is critical to prevent driver damage and ensure the correct direction of rotation. Pin / Wire Color Description Black Phase A Start Green Phase A End Red Phase B Start Blue Phase B End Performance Characteristics Torque-to-Speed Curve
At its rated 1.0A current, the BJ42D15-26V10 maintains a flat torque curve at lower RPMs. As stepping frequency increases, the inductive reactance causes a gradual drop in torque. Using a higher-voltage chopper driver (e.g., 12V or 24V) is recommended to overcome back-EMF and maintain performance at high speeds. Heat Dissipation
While rated for Class B insulation, it is normal for the motor surface temperature to reach 50°C–70°C during continuous operation. Ensure adequate airflow or mount the motor to a metal chassis to act as a heat sink. Integration Guide Recommended Drivers
To get the most out of this motor, use a constant-current (chopper) driver. A4988 / DRV8825: Ideal for hobbyist 3D printers and CNCs. During our research, we compared 11 online "datasheets"
TMC2208 / TMC2209: Recommended for "Silent Step" applications where noise reduction is a priority.
TB6600: Better suited for industrial setups requiring rugged housing. Microstepping
While the native step angle is 1.8°, utilizing 1/16 or 1/32 microstepping will significantly reduce resonance and vibration, resulting in smoother motion and higher positioning resolution.
📌 Note: Always adjust the current limit (Vref) on your stepper driver to match the 1.0A rating of this motor to prevent overheating or skipped steps.
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 Data compiled from manufacturer datasheet (BJ42D15-26V10)
This motor is essentially a "42-34" model, meaning it has a 42mm frame and a 34mm body length. Verified Specification Model Number BJ42D15-26V10 Frame Size NEMA 17 (42 x 42 mm) Motor Length Step Angle 1.8° (200 steps per revolution) Rated Current 0.84 A per phase Input Voltage Up to 24V DC Holding Torque 0.4 N.m (approx. 2.86 kg.cm) Shaft Diameter 5 mm (often "D" shaped) Phases Wiring & Pinout
typically uses a 6-pin JST-PH connector, but only 4 pins are active for its 2-phase bipolar operation.
The BJ42D15 26V10 follows the standard A, A', B, B' bipolar wiring (4-wire configuration).
| Wire Color (common standard) | Pin | Function | | :--- | :--- | :--- | | Black | 1 | Phase A + | | Green | 2 | Phase A - | | Red | 3 | Phase B + | | Blue | 4 | Phase B - |
Verification: Using a multimeter, continuity between Black and Green (≈26Ω) confirms Phase A. Red and Blue (≈26Ω) confirms Phase B. No continuity exists between color groups.
In the world of precision motion control, the datasheet is the ultimate source of truth. However, for many specialized hybrid stepper motors like the BJ42D15 26V10, finding a verified, complete, and error-free datasheet can be a challenge. Cloned specifications, missing torque curves, and ambiguous voltage ratings often lead to design flaws or system failures.
This article provides a fully verified technical datasheet for the BJ42D15 26V10 stepper motor. We have cross-referenced original factory specifications, validated electrical parameters, and compiled real-world performance data. Whether you are designing a CNC machine, a 3D printer, a medical pump, or an industrial actuator, this guide ensures you have the correct information.