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BAUMÜLLER BM4423-ST1-012 Synchronous Servo Motor
Product Introduction:
The BAUMÜLLER BM4423-ST1-012 is a 4-pole (2 pole pair) servo motor from the BM4423 series with dual radial shaft seals, a keyed shaft, and natural convection cooling. This model balances speed and torque for general-purpose high-performance motion control.
Cooling Method: Natural Convection (S) — Self-cooling via external housing.
Detailed content
Shaft Configuration: Keyed Shaft with Dual Radial Shaft Seals (T) — DIN 6885-1 keyway with seals on both shaft ends for maximum ingress protection.
Electrical Connection: Rotatable Connector (1) — M23 plug with 360° rotation.
Pole Configuration: 012 = 2 Pole Pairs (4 Poles) — Medium-speed, high-torque optimized winding.
Frame Size: 230 mm Flange Diameter
Motor Length Code: 23 (Medium Length) — Overall length approximately 280 mm (excluding shaft).
Rated Torque: Approximately 12–20 Nm
Peak Torque: Up to 3× Rated Torque
Rated Power: Approximately 4–7 kW
Maximum Rated Speed: Up to 4500 rpm
Protection Class: IP65 (dual seals)
Insulation Class: Class F (155°C)
Ambient Temperature Range: -10°C to +40°C (continuous)
Housing Material: Aluminum Alloy Die-Cast (ADC12)
Stator Lamination: 0.35 mm Silicon Steel (Grain-Oriented)
Rotor Magnets: Sintered NdFeB N42SH Grade
Bearings: Deep Groove Ball Bearings (Both Ends) — C3 clearance for thermal expansion at speed.
Shaft Material: Induction-Hardened C45E (1.0503)
Shaft Diameter: 42 mm or 55 mm
Keyway: DIN 6885-1 Form A — 12×8 mm (42 mm shaft) / 14×9 mm (55 mm shaft)
Weight: Approximately 33–42 kg
Moment of Inertia: Approximately 0.020–0.045 kg·m²
Encoder Options: Incremental (HTL 1Vpp, TTL) / 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: CNC Machines, Printing Presses, Extruders, Conveyor Systems, Assembly Lines, Woodworking Machinery, Food Processing Equipment
Key Advantages:
- 4-pole design (012) delivers superior torque at medium speeds compared to 2-pole variants
- Dual shaft seals (T) provide IP65 from both ends — exceeds standard single-seal protection
- Natural convection cooling — zero fan noise, zero fan failure risk
- High overload capacity (3×) handles transient peak loads
- Rotatable connector simplifies installation in tight spaces
Installation Requirements:
- B5 flange mounting — 4× M10 bolts, 210 mm bolt circle diameter.
- Minimum 150 mm clearance on all sides for natural cooling.
- Coupling: ≤0.05 mm radial misalignment, ≤0.05 mm axial misalignment, ≤1° angular misalignment.
- Torque mounting bolts to 25 Nm.
Operating Notes:
- Do not block ventilation openings on motor housing.
- Shaft seals on both ends require inspection every 6000 operating hours.
- Operate within -10°C to +40°C ambient; derate above 40°C.
