The BJ42D15-26V10 is a 2-phase NEMA 17 bipolar stepper motor manufactured by Hunan Keli Motor. It is commonly found as a stock component in Creality 3D printers, such as the Ender 3 series, typically used for the X, Y, or Z axes. Key Features & Specifications Step Angle: 1.8∘1.8 raised to the composed with power (200 steps per revolution). Rated Current: Approximately per phase. Note: While some Creality variants are rated up to , technical discussions suggest
Verdict: The BJ42D15 sacrifices torque for low heat generation and low current draw. It is ideal for single-board electronics where your motor driver cannot handle 1.5A+.
Page six was the last. Aldric’s handwriting had become jagged, panicked. bj42d15 26v10 stepper motor datasheet
A: High resistance limits current naturally. This motor was designed before cheap, efficient chopper drivers existed. It runs directly off a 26V regulated supply without needing a current-limiting driver.
"Day 43: Built the bj42d15 with graphene windings and a beryllium-copper rotor. Applied 26.10 kHz square wave via the Ψ-configuration. The rotor didn’t move. Instead, the air around it grew cold. My watch ran backward for 11 seconds." The BJ42D15-26V10 is a 2-phase NEMA 17 bipolar
Prepared for: Engineering Reference
Document Type: Simulated Datasheet Review
Date: April 21, 2026
Note on D15 Length: The "D15" designation creates a body length of approximately 40mm. Excluding the rear protrusion, the total motor depth is roughly 48mm. This is shorter than a standard "D20" or "D25" stack, making the BJ42D15 ideal for space-constrained designs where torque requirements are moderate. such as the Ender 3 series
Physical Profile: It is a "42-34" motor, meaning it has a 42mm faceplate and a 34mm body length. The Community "Ending" Creality Ender 3 Stock Factory Vref · GitHub