A BLDC inrunner motor stator is the stationary laminated core of an inrunner brushless DC motor—a design where the permanent magnet rotor rotates inside the stator electromagnets. In the conventional (inrunner) configuration, the permanent magnets are part of the radially center core, while the stator contains the windings. The stator is built around the rotor and fixed to the motor housing. Compared to outrunners, inrunners feature a much smaller rotor diameter, enabling lower moment of inertia and making them ideal for highly dynamic applications such as multi-copters.

Reenives manufactures high-quality BLDC inrunner motor stator cores using non-grain oriented silicon steel (0.20mm/0.35mm) with advanced C5 epoxy powder coating—ensuring low core loss and high thermal stability for sustained high-RPM operation up to 40,000 RPM.

Reenives offers BLDC inrunner stator cores in multiple configurations to meet diverse application requirements:

• By Housing Design: Closed housing (IP54-IP67 rated, rugged for harsh environments) and open housing (lightweight, air-cooled for weight-sensitive UAV applications).
• By Power Range: 100W – 50kW (customizable). Industry examples include 1-5kW ADVANCE family and 1-30kW NOVA family for mission-critical inrunner motors.
• By Pole Count: Up to 70 poles (35 pole pairs), enabling high torque density and eliminating gearboxes in most applications.
• By Material Thickness: 0.20mm (high-frequency high-RPM UAV), 0.27mm, and 0.35mm (general industrial drives).
• By Insulation Coating: C5/C7 epoxy powder coating with >1800V dielectric strength, Class H (180°C).

💡 Reenives specialty: private mould development for custom inrunner stator geometries—from compact 18mm frame sizes to large 274mm industrial drive stators, with fully customizable cooling channels and IP ratings.

All parameters validated by Reenives R&D center (ISO 9001:2025 certified) and third-party testing per IEC 60404-2. Performance benchmarks informed by industry-leading inrunner motor specifications.

📐 Data source: Reenives in-house quality lab, 2025–2026. Full batch traceability and material certificates available.

Reenives BLDC inrunner motor stator cores power critical applications across multiple sectors:

• Fixed-Wing UAVs & Multi-Copters: High power-to-weight ratio with low inertia for dynamic flight control. Inrunners are preferred for high power requirements such as heavy-duty drones or manned systems.
• Mission-Critical Aerospace: Closed housing designs (IP54-IP67) for operation in desert, snow, and maritime environments with extended MTBS/F and reduced total cost of ownership.
• Industrial Automation & Robotics: High-speed positioning, conveyor systems, and AGV drives requiring compact motor dimensions and high efficiency.
• Fluid Systems & Pumps: Precise fluid regulation with high efficiency and low maintenance, benefiting from smooth-running inrunner designs.
• Defense & Marine Systems: Corrosion-resistant IP67-rated inrunner motors for UUVs, USVs, and marine propulsion applications.

1. Define power, speed, and environmental requirements: For heavy-duty UAVs (50kW class), select closed housing designs. For weight-sensitive applications (sub-5kW), open housing with integrated cooling is optimal.
2. Choose lamination material thickness: 0.15-0.20mm for high-frequency UAV (>30,000 RPM) / 0.35mm for robust industrial drives (<10,000 RPM).
3. Select pole count and slot geometry: High pole counts (up to 70) enable gearbox elimination in most applications—reducing system weight and cost.
4. Specify protection class and customization: IP54 standard for most UAV applications; higher classes (IP67) available for marine and harsh-environment systems.
5. Request samples and validation: Reenives delivers first-article inspection reports (FAI) and material certificates. Prototype stator samples ready in 7-10 days after design approval.

💡 Engineering support: Free DFM within 48h — send your motor spec or drawing to linda_reenives@163.com.