To avoid skipping steps or overheating your motor, you must correctly set the motor driver's reference voltage (VREF). In desktop 3D printers using drivers like the A4988 or TMC2208/TMC2209, setting the current to roughly balances cool operation with ample torque. BJ42D15-26V10 rated at a maximum current ( Imaxcap I sub max end-sub ) of 0.84A, the target driving current ( Iruncap I sub run end-sub ) should be:
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Why choose the BJ42D15 26V10 over other NEMA 17s?
While official standalone PDF documentation can be notoriously difficult to find for specific OEM batch numbers, community testing, manufacturer correspondence, and cross-references from the Keli Motor Group establish the standard datasheet metrics for the BJ42D15-26V10 variant: Specification Profile NEMA 17 (42 mm × 42 mm) Body Length 34 mm (Often referred to as a "42-34" motor) Step Angle 1.8° (±5% accuracy per full step) Steps Per Revolution Phase / Configuration 2-Phase Hybrid / Bipolar Rated Voltage Maximum 24V – 26V DC Rated Current (Peak) 0.84A – 1.0A max Holding Torque ~2.86 kg·cm (0.28 N·m / 40 oz-in) Shaft Diameter & Style 5mm "D-Shape" or Round (varies by production lot) Insulation Class Class B (Safe operating temperature up to 80°C rise) Understanding the Part Number (Decoded) bj42d15 26v10 stepper motor datasheet
Thanks to its lightweight body and precise torque profile, the BJ42D15-26V10 is widely used in:
VREF=Imax×8×Rsense×0.7cap V sub cap R cap E cap F end-sub equals cap I sub m a x end-sub cross 8 cross cap R sub s e n s e end-sub cross 0.7
Budget-friendly, reliable, but can be noisy. To avoid skipping steps or overheating your motor,
| Parameter | Value | |------------------------|---------------------------| | Temperature rise | 80°C max (rated current) | | Ambient temperature | –20°C to +50°C | | Storage temperature | –25°C to +70°C | | IP rating | IP30 (open frame) |
Note on Voltage: While the rated voltage is 2.6V, stepper motors are intended to be driven by constant-current chopper drivers (like the A4988 or TMC2209) supplied with much higher bus voltages (12V to 24V DC). The driver limits the current to the specified 1.0A, allowing the motor to achieve higher speeds without impedance choke. Wiring Diagram and Pinout
Generally around 15–20 mH, typical for 42-34 NEMA 17 motors. Application & Setup Tips This appears to be a specific stepper motor model
Note: Always verify phase pairs using a multimeter to check continuity. Wires within the same phase will have low resistance (approx. 1.5Ω - 1.75Ω) between them, while wires from different phases will have infinite resistance (open circuit).
Standard 6-pin JST-PH connector on the motor side, typically using 4 wires for a 2-phase bipolar configuration. Creality Ender 3 Stock Factory Vref · GitHub