Cooling Method: Natural Convection (S) — Self-cooling via external housing surface. Note: For BM4424 frame, natural cooling limits continuous power output compared to forced-air variants; this model is rated for applications where ambient ventilation is sufficient.

Shaft Configuration: Keyed Shaft with Radial Shaft Seal (I) — DIN 6885-1 keyway with single radial lip seal on drive end.

Electrical Connection: Rotatable Connector (1) — M23 plug with 360° rotation.

Pole Configuration: 212 = 2 Pole Pairs (4 Poles) — Medium-speed, high-torque winding optimized for the larger frame.

Frame Size: 280 mm Flange Diameter

Motor Length Code: 24 (Long Length) — Overall length approximately 340–400 mm (excluding shaft).

Rated Torque: Approximately 20–40 Nm

Peak Torque: Up to 3× Rated Torque

Rated Power: Approximately 7–15 kW (lower than AT1 forced-cooling variant due to natural cooling limitation)

Maximum Rated Speed: Up to 3000 rpm (4-pole design)

Protection Class: IP65 (with shaft seal)

Insulation Class: Class F (155°C)

Ambient Temperature Range: -10°C to +40°C (continuous)

Housing Material: Aluminum Alloy Die-Cast (ADC12) — Large housing with extended surface fins for enhanced natural convection.

Stator Lamination: 0.35 mm Grain-Oriented Silicon Steel

Rotor Magnets: Sintered NdFeB N42SH Grade

Bearings: Deep Groove Ball Bearings (C3 Clearance, Both Ends)

Shaft Material: Induction-Hardened C45E (1.0503)

Shaft Diameter: 55 mm or 70 mm

Keyway: DIN 6885-1 Form A — 14×9 mm (55 mm shaft) / 18×11 mm (70 mm shaft)

Weight: Approximately 50–75 kg

Moment of Inertia: Approximately 0.060–0.200 kg·m²

Encoder Options: Incremental (HTL 1Vpp, TTL) or Absolute (EnDat 2.2, Hiperface DSL, BiSS-C)

Standards Compliance: EN 60034-1, EN 60034-5, EN 61800-5-1, CE, UL Listed (optional)

Applicable Industries: Large CNC Machines, Heavy Packaging, Printing Presses, Plastic Processing, Metal Forming, Woodworking, Food & Beverage, Pharmaceutical Machinery — where natural cooling is viable

Key Advantages:

• 280 mm frame (BM4424) provides 20–40 Nm torque — significantly higher torque than BM4423 series
• Natural convection cooling (S) — zero fan noise, zero fan failure, zero filter maintenance
• 4-pole winding (212) delivers balanced speed-torque for general heavy-duty applications
• Keyed shaft with seal (I) — direct mechanical coupling with IP65 protection
• Rotatable connector — flexible installation in tight spaces
• Lower total cost of ownership compared to forced-air variants (no fan, no filters, no fan motor)

Installation Requirements:

• B5 flange mounting — 4× M12 or 4× M16 on 280 mm bolt circle diameter.
• Minimum 250 mm clearance on all sides for natural convection (more than BM4423 due to larger frame).
• Ensure installation location has adequate ambient airflow.
• Coupling: ≤0.05 mm radial misalignment, ≤0.05 mm axial misalignment, ≤1° angular misalignment.
• Mounting bolt torque: 40–60 Nm (M12) or 80–120 Nm (M16).

Operating Notes:

• Derate power output by 1.5% per °C above 40°C ambient — natural cooling is less effective at high ambient temperatures.
• Do not install in enclosed cabinets without ventilation — natural cooling requires ambient air contact with housing.
• Shaft seal inspection: every 6000 operating hours or 12 months.
• Maximum continuous speed: 3000 rpm — do not exceed.
• Bearing temperature maximum: 90°C.