VREF=1.0×8×0.1×0.7≈0.56 Voltscap V sub cap R cap E cap F end-sub equals 1.0 cross 8 cross 0.1 cross 0.7 is approximately equal to 0.56 Volts
The 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.
At 26 Ohms per phase, this is considered a high-resistance stepper . Most modern stepper drivers (like A4988 or TMC2209) operate optimally at 1.5 – 2.0 Ohms. Therefore, the BJ42D15 is not intended for standard "chopper" drivers running on 12V. Instead, it is designed for L/R drive circuits or constant voltage drivers using 26V DC. bj42d15 26v10 stepper motor datasheet
Below is a structured technical paper you could use as a template. If you obtain the real datasheet, you can replace the assumed values.
For more information on the BJ42D15 26V10 stepper motor, including technical documentation, datasheets, and application notes, please visit our website or contact our sales team. VREF=1
Below is the technical parameter table for the BJ42D15 sub-family, among which the is located (its exact specifications are highlighted in bold ):
The BJ42D15-26V10 requires an appropriate stepper motor driver to operate. The motor has been successfully driven with the TB6612FNG motor driver, a common choice for beginners due to its simplicity and availability. For more advanced users, drivers like the (offering quiet, StealthChop2 operation) or the A4988 (a classic, reliable driver found in many 3D printer control boards) are excellent choices. The driver's current limiting must be set correctly, usually to the motor's rated current (0.8A to 1.0A). This is often adjusted via a small potentiometer (Vref) on the driver module. At 26 Ohms per phase, this is considered
The table below summarizes the key electrical and mechanical specifications of the BJ42D15-26V10 motor based on available manufacturer datasheets and field data:
| Model | Current | Voltage | Torque | Best For | | :--- | :--- | :--- | :--- | :--- | | | 1.0A | 2.6V | 0.22 N·m | Battery-powered devices, small extruders | | Standard NEMA 17 | 1.5A | 3.0V | 0.40 N·m | General 3D printing (Ender 3) | | High Torque NEMA 17 | 2.0A | 3.6V | 0.55 N·m | CNC, Laser engravers | | BJ42D47 (Long) | 1.8A | 4.0V | 0.48 N·m | Heavy Z-axis lifts |