The BJ42D15-26V10 is a NEMA 17 stepper motor manufactured by Hunan Keli Motor Co. and is commonly used as a stock component in Creality 3D printers, such as the Ender-3 series. Technical Specifications
Based on its design as a "42-34" series motor, the following technical profile applies: Step Angle : 1.8° (200 steps per revolution). Rated Current : 0.84A per phase. Phase Resistance Holding Torque : 0.4 N.m (approx. 2.86 kg.cm). Nominal Voltage
Robotics: Provides high holding torque for articulated robotic arms. Integration Tips bj42d15 26v10 stepper motor datasheet
Use power resistors in series with a higher voltage supply. For 26V operation, drive directly. For 12V operation, you need no resistors (since 26 Ohms limits current to 0.46A on 12V – safe but low torque).
The BJ42D15 26V10 is a "current-limited" motor. If you connect it directly to a 12V battery (without a chopper driver), Ohm's Law dictates: I = V / R = 12V / 2.6Ω = 4.6 Amps. The motor will reach 130°C in under 60 seconds and be destroyed. The BJ42D15-26V10 is a NEMA 17 stepper motor
The BJ42D15-26V10 typically features a 4-wire bipolar configuration. Understanding the wire pairings is critical to prevent damage to your stepper driver. Standard Color Coding: Phase A: Black (A+) and Green (A-) Phase B: Red (B+) and Blue (B-)
If you want, I can:
Note: Users often mistake these for 1.5 A motors; however, manufacturer data for the BJ42D15 series confirms a lower rated current of 0.84 A. Holding Torque: ~0.4 N·m (approx. 2.86 kg·cm) Shaft Diameter: 5 mm Electrical Characteristics
![Conceptual diagram of NEMA 17 dimensions: 42mm width, 31mm bolt circle, 5mm D-shaft] Rated Current : 0