8520 Magnetic Micro Coreless Motor for Micro Quadcopters

8520 Magnetic Micro Coreless Motor for Micro Quadcopters delivers high-speed performance in an incredibly compact and lightweight form factor, making it the ideal propulsion system for micro-class FPV drones and miniature aircraft. This brushed DC coreless design eliminates the heavy iron core, which significantly reduces rotational inertia, resulting in consequently faster response times and higher efficiency compared to traditional brushed motors. You can power this motor directly from a 1S LiPo battery (3.7V nominal). Therefore, builders widely select the 8520 motor for DIY micro quadcopters because it provides the required thrust to achieve agile and responsive flight while maintaining a low overall build weight, which is critical for maximizing flight time.

Key Features:

• Coreless Design: Eliminating the iron core reduces weight and inertial resistance, offering superior acceleration and dynamic responsiveness for agile flight control.
• High RPM Output: Achieves speeds up to 39,000 RPM (at 3.7V), providing the considerable thrust needed to lift and maneuver micro quadcopters effectively.
• Ultra-Lightweight: With a typical weight of ≈ 5 g, this motor contributes minimally to the total mass, consequently extending battery life and improving flight performance.
• Low Noise Operation: The coreless structure and high-precision construction ensure smoother and less noisy operation compared to standard cored motors.
• CW and CCW Variants: Available in both Clockwise (CW) and Counter-Clockwise (CCW) rotations, essential for configuring the thrust vectoring on multirotor frames.

Technical Specifications:

• Motor Type: Brushed DC Coreless
• Rated Voltage (V_DC): 3.7 V (1S LiPo compatible)
• Operating Voltage Range: 3.0 V to 4.2 V
• No-Load Speed (Rated RPM): ≈ 39,000 RPM (Speeds may vary slightly by batch)
• No-Load Current: Typically ≈ 100 – 300 mA
• Rated Load Current: ≈ 1.6 A to 1.8 A (Maximum thrust condition)
• Stall Current: Can exceed 5 A; consequently, avoid stalled operation to prevent damage to the motor or MOSFET driver.

Mechanical Specifications:

• Casing Material: Metal/Aluminum Alloy
• Commutation: Brushed (Carbon or Precious Metal)
• Bearing Type: Bushing or Miniature Ball Bearings
• Shaft Type: Smooth cylindrical shaft, ideal for push-fit propellers.
• Recommended Propeller Size: 55 mm to 65 mm (Typically 2.2 to 2.5 inches)

Dimensions:

• Motor Diameter: 8.5 mm
• Motor Length: 20.0 mm
• Shaft Diameter: 1.0 mm (Commonly 1.0 mm or 1.2 mm depending on batch)
• Shaft Length: ≈ 5.0 mm
• Wire Length: ≈ 6 cm to 12 cm
• Weight: ≈ 5.0 – 5.5 g

Pinout and Wiring:

• CW Rotation (Clockwise): Typically uses Red (+) and Blue (−) wires. Connect Red to the positive voltage and Blue to the ground/ESC output pin.
• CCW Rotation (Counter-Clockwise): Typically uses White (+) and Black (−) wires. Connect White to the positive voltage and Black to the ground/ESC output pin.
• Polarity Reversal: Reversing the wire polarity reverses the motor’s direction of rotation. However, check specific color codes for your motor set to confirm rotation direction before flight.

Datasheet Reference:

• Download 8520 Coreless Motor Performance Reference

Commonly Used in:

• Micro FPV Racing Drones: Powering frames in the 70 mm to 150 mm size class, such as the QX80 or Inductrix variants.
• Toy Grade Quadcopters: Serving as high-performance replacement or upgrade motors for consumer drones.
• Miniature Robotics: Providing high-speed drive for small, custom robotic actuators or educational platforms.

Applications:

• Lift and Thrust Generation: Generating the primary lift and maneuverability for quadcopter flight controllers.
• High-Speed Actuators: Utilizing the quick response for applications demanding rapid changes in motion.
• DIY Aircraft Projects: Driving propellers on small-scale fixed-wing aircraft and other custom RC models.

Equivalent Models:

• 720 Coreless Motor: A smaller, lower-power option (7mm diameter) often used in even smaller micro drones.
• Mabuchi FK-050 Series: While a different form factor, the FK-050 series also provides similar high-speed, low-torque characteristics for miniaturization projects.
• Various 8.5 x 20 mm Coreless Motors: Manufacturers commonly refer to motors with these dimensions and specifications as “8520-type” motors, so many generic models offer functional equivalence.

Package Includes:

• 1 x 8520 Magnetic Micro Coreless Motor (Rotation and wire color may vary; typically sold in CW/CCW pairs)