Bj42d15 26v10 Stepper Motor Datasheet ❲CERTIFIED❳

BJ42D15 26V10 Stepper Motor: Complete Datasheet & Technical Deep Dive

Mechanical Specifications

• Holding Torque: Approx. 0.4 N·m to 0.45 N·m (40-45 N·cm).
• Detent Torque: ~0.02 N·m (Torque required to rotate the shaft when not energized).
• Shaft Diameter: 5mm (Standard D-cut shaft).
• Shaft Length: ~20mm - 24mm.
• Radial Play: 0.02mm Max (at 300g load).
• Axial Play: 0.08mm Max (at 100g load).

Typical pinout (4-lead bipolar)

• A+: Coil A end 1
• A-: Coil A end 2
• B+: Coil B end 1
• B-: Coil B end 2

📄 Equivalent Datasheet: BJ42D15 (NEMA 17 Short)

| Specification | Value | Notes | | :--- | :--- | :--- | | Motor Type | Hybrid Stepper Motor | Permanent Magnet, 2-Phase | | Frame Size | NEMA 17 (42 x 42 mm) | Standard mounting holes | | Body Length | 15 mm | "Short" profile | | Step Angle | 1.8° | 200 steps per revolution | | Rated Voltage | 2.6V DC | See voltage note below | | Rated Current | 1.0A per phase | | | Coil Resistance | ~2.6 Ω per phase | Calculated: V/R = 2.6/2.6 = 1.0A | | Holding Torque | 0.16 - 0.20 N·m (22 - 28 oz-in)| Typical for 15mm length | | Rotor Inertia | ~18 g·cm² | | | Lead Wire | 4 wires | Standard bipolar connection | | Insulation Class | Class B (130°C) | Standard for budget motors | | Weight | ~150 grams | |

The "26V10" Trap

Many beginners mistake "26V" for the supply voltage. This is a fatal error. 2.6V is the DC resistance voltage drop, not the driving voltage. In practice, you drive this motor with a chopper driver (like an A4988 or TMC2209) at 12V to 24V, while limiting the current to 1.0A. bj42d15 26v10 stepper motor datasheet

Torque-Speed Characteristics

Unlike low-inductance motors, the BJ42D15 26V10 exhibits high inductance (approx. 28mH). This results in a specific torque curve: BJ42D15 26V10 Stepper Motor: Complete Datasheet & Technical

• At Low Speed (0 – 300 RPM): Holding torque remains near 0.30 N·m. Excellent for indexing and positional holding.
• Mid Range (300 – 600 RPM): Torque drops to approximately 0.15 N·m. The motor runs smoothly with low vibration.
• High Speed (600 – 1000 RPM): Torque falls off sharply to 0.05 N·m. Due to the high inductance, the motor struggles at high step rates unless the drive voltage is significantly increased beyond 26V (up to 50V is permissible if current is limited).

Recommendation: Operate this motor below 600 steps per second (300 RPM) for optimal performance. Holding Torque: Approx