Bj42d15 26v10 Stepper Motor Datasheet

| Symptom | Possible Cause | Solution | | :--- | :--- | :--- | | | Vref is set too high, causing overcurrent. | Lower the driver's Vref. A user reduced theirs from 1.1V to 0.9V to solve overheating. | | Motor is extremely hot | Incorrect motor variant (e.g., a 0.8A motor treated as a 1.5A motor). | Verify the physical motor length (34mm) and its label code. | | Motor loses steps / skips | Driver current is set too low. | Recalculate and increase the Vref, ensuring it stays below the motor's rated current. | | Motor does not move | Incorrect wiring (e.g., mixing phases A and B). | Verify with a multimeter that each coil is connected to the correct driver terminals. | | Motor vibrates but does not rotate | A4988 driver's microstep pins (MS1, MS2, MS3) are not set correctly. | Check the state of your driver's microstep selection pins. | | Clicking noise / no movement | The driver's enable pin is active, or the motor current is too low. | Check driver enable logic and Vref calculation. |

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The is a NEMA 17 hybrid stepper motor commonly found as original equipment in Creality 3D printers, such as the Ender-3 series. Often referred to by its dimensions as a "42-34" motor, it is frequently used to drive the X, Y, or Z axes. Core Technical Specifications BJ42D15-26V10

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Requires precise, slow, high-torque movements to lift the gantry.

Important Context: "BJ42D15" is almost certainly a generic designation used by Chinese manufacturers (often found on Alibaba, AliExpress, or integrated into CNC/3D printer kits). It typically breaks down as:

The BJ42D15-26V10 conforms strictly to the . This ensures standard mounting compatibility across modern consumer robotics and FDM printer frames. Creality Ender 3 Stock Factory Vref · GitHub bj42d15 26v10 stepper motor datasheet

For the standard 4-wire bipolar version of the BJ42D15-26V10, the wiring is straightforward.

Set your stepper driver's Vref current limit to 1.0A (Or 0.7A RMS if using a TMC silent driver).

5 mm (standard D-shape shaft for pulley/coupling grip) Shaft Length: 20 mm to 24 mm Weight: 220 grams to 240 grams | Symptom | Possible Cause | Solution |

If you are upgrading or tuning your printer’s motors, it’s critical to check the motor label and set the correct Vref accordingly, as using the wrong value can cause overheating and layer shifting.

Most variations of this motor utilize a 4-pin plug directly on the rear housing or a flying lead wire harness. Pin Number Wire Color (Standard) Phase Designation Description Phase A Positive 2 Phase A Negative 3 Phase B Positive 4 Phase B Negative