Stator Laminations — What Is Drone Motor Stator Laminations? | Reenives Drone Stator Laminations Supplier

What Is Drone Motor Stator Laminations?

Drone motor stator laminations are thin sheets of electrical steel — typically silicon steel — stamped into a slotted ring shape and stacked together to form the stationary magnetic core of a brushless drone motor. Each individual lamination is coated with a thin insulation layer to limit eddy currents between layers, and the full stack forms the stator core that holds the copper windings.

The term "laminations" emphasizes the individual stamped sheets, not the assembled core. This distinction matters because every performance characteristic of the finished stator — core loss, stacking factor, slot geometry accuracy — comes from the properties of each individual lamination:

• Material grade determines how much loss occurs in the magnetic circuit
• Lamination thickness determines the eddy current loss component
• Stamping precision determines the slot geometry, tooth width, and yoke width
• Insulation coating determines the inter-lamination resistance
• Edge quality (burr height) determines stacking accuracy and inter-lamination shorts

In a drone brushless motor, the stator laminations perform the same function as in any BLDC motor: they carry the copper windings and generate the rotating magnetic field that drives the rotor. But at the high RPM drone motors operate at — often 20,000 RPM and above — lamination quality matters far more than in low-speed motors. Eddy current losses scale with the square of frequency, so thin, low-loss laminations are essential for keeping a drone motor cool and efficient.

Stator laminations vs. rotor laminations: Stator laminations have slots to hold the windings and form the stationary magnetic circuit. Rotor laminations carry permanent magnets (or cage bars) and form the rotating magnetic circuit. Both are built from stacked silicon steel laminations, but their geometries are different and they must be matched as a pair.

Put simply: stator laminations are the building blocks of the stator core — and the quality of those individual sheets determines the efficiency, thermal performance, and reliability of the finished drone motor.

Precision drone motor stator laminations — manufactured by Reenives with imported high-speed stamping & epoxy powder coating lines.

Types of Stator Laminations

Stator laminations come in several configurations, each suited to different motor designs and performance requirements. Reenives manufactures the following types:

• One-Piece Stator Laminations — Traditional full-ring lamination design with slots for windings. Cost-effective for medium to high-volume production, and the standard in most drone motors.
• Segmented Stator Laminations — Individual teeth stamped separately for separate winding, then assembled into a full core. Higher slot fill factor and copper utilization.
• Interlocked Stator Laminations — Laminations with integral dimples or dovetails that lock together under pressure. Cost-effective for high volume; the standard for most FPV and UAV motors.
• Bonded Stator Laminations — Laminations coated with adhesive and bonded under heat and pressure instead of interlocking. Lower eddy current losses and reduced vibration — preferred for gimbal motors and high-precision applications.
• Epoxy-Coated Stator Laminations — Each lamination individually coated with epoxy powder for superior insulation, corrosion resistance, and wire adhesion. H-Class 180°C electrostatic coating is standard for high-RPM drone stators.
• Laser-Cut Stator Laminations — Cut with a focused laser rather than a stamping die. No tooling cost, fast turnaround for prototypes and low-volume production.
• 0.15–0.20 mm Ultra-Thin Laminations — For high-frequency, high-RPM drone motors. Thinner laminations significantly reduce eddy current losses at the cost of higher stamping difficulty.
• Custom Stator Laminations — Private mould development for unique slot counts, outer diameters, bore diameters, and stack heights.

Whether you need a standard 12-slot/14-pole stator lamination for an FPV motor or a custom high-frequency lamination for a large industrial UAV motor, Reenives can deliver.

Key Specifications & Data

Below are typical specifications for Reenives drone motor stator laminations. Custom values are available upon request.

Data source: Reenives internal testing & supplier material datasheets, 2024–2025. Actual values may vary by design.

Applications & Why Stator Laminations Matter

Stator laminations directly determine the motor's performance across every flight condition. Here is why lamination quality matters so much:

• Core Loss & Flight Time — Thin, low-loss laminations with proper insulation coating reduce eddy current losses, directly improving motor efficiency and flight endurance.
• Slot Fill Factor — Accurate stamping of slot geometry enables higher copper fill, increasing torque density and reducing I²R losses.
• Thermal Performance — Lower core loss means less heat generation, keeping the motor cooler and extending component life.
• Air Gap Consistency — Tight lamination tolerances keep the assembled stator bore round and consistent, which is essential for smooth high-RPM operation.
• Cogging Torque & Vibration — Slot/pole combination and lamination edge quality determine cogging torque, which affects control smoothness and vibration.
• Production Consistency — Consistent lamination geometry and stacking pressure ensure that every motor in a batch delivers the same KV, thrust, and thermal behavior.

Reenives drone motor stator laminations are used across a wide range of UAV and brushless motor applications:

• FPV Racing Drones — High RPM, lightweight stator laminations with low cogging torque and fast throttle response.
• Cinematic & Photography Drones — Smooth, vibration-free stator laminations for stable aerial footage.
• Agricultural Spraying Drones — Corrosion-resistant epoxy-coated stator laminations for harsh chemical environments.
• Industrial Inspection Drones — High-torque stator laminations for long endurance and heavy payloads.
• eVTOL & UAV Propulsion — Custom high-power stator laminations for next-generation air mobility.
• Camera Gimbal Motors — Ultra-low cogging stator laminations for professional stabilization systems.
• General BLDC Motors — Fans, pumps, robotics, power tools, and automotive actuators.

Reenives drone motor stator laminations power FPV, agricultural, cinematic, and industrial UAVs worldwide.

How to Select the Right Stator Laminations

Choosing the correct stator laminations for your drone motor involves several engineering decisions. Follow these steps:

1. Determine Motor Type — Outrunner or inrunner? Outrunner stator laminations are common in drones for high torque; inrunner stator laminations suit high-RPM ducted fans.
2. Determine Required Torque & RPM — Higher torque needs more stack height or larger diameter. High RPM demands thinner laminations and low-loss material.
3. Select Slot/Pole Combination — Common drone motors use 12S/14P or 9S/6P. This affects cogging torque, winding factor, and efficiency.
4. Choose Lamination Thickness — For high-frequency operation (e.g., 400Hz+), use 0.15–0.20 mm laminations to reduce eddy current losses.
5. Select Material Grade — Lower-loss silicon steel grades (e.g., 20JNEH1200) reduce heat but cost more. Balance performance and budget.
6. Consider Assembly Method — Interlocked laminations are the standard for FPV motors; bonded or segmented laminations reduce vibration and improve slot fill.
7. Decide on Insulation & Coating — Epoxy powder coating with H-Class 180°C rating is recommended for moisture, vibration, and chemical resistance.
8. Request Samples & Test — Reenives provides free samples for qualified projects. Test core loss, temperature rise, cogging torque, and mechanical fit.

FAQ — Stator Lamination Parameters

Summary — Stator Laminations Are the Foundation of Every Efficient Drone Motor