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BAUMÜLLER BM4432-SI0-022 00-03
Model Series: BM44 Series — Medium-Frame Synchronous Servo Motor
Product Introduction:
The BM4432-SI0-022 00-03 is a medium-frame synchronous servo motor from the Baumüller BM44 product line. It features a smooth shaft (without keyway), natural convection cooling, and a multi-turn absolute encoder, making it suitable for applications requiring unlimited rotation counting and backlash-free shaft coupling.
Detailed content
Type Designation Breakdown:
- BM44 — BM44 Series Servo Motor
- 32 — Frame Size 32 (outer diameter approximately 160 mm)
- S — Synchronous Servo Motor
- I — Smooth Shaft (No Keyway), Natural Convection Cooling
- 0 — Multi-Turn Absolute Encoder
- 022 — Winding/Configuration Code
- 00-03 — Version/Revision Code
Technical Specifications:
| Parameter | Value |
|---|---|
| Frame Size | 32 |
| Stator Outer Diameter | 160 mm |
| Motor Length | Medium |
| Cooling Method | IC 411 — Natural Convection (Self-Cooled) |
| Shaft Type | Smooth Shaft (Without Keyway) |
| Encoder Type | Multi-Turn Absolute Encoder (EnDat 2.1 / Hiperface DSL) |
| Encoder Resolution | 128 sinusoidal periods per revolution, multi-turn (up to 4096 turns) |
| Rated Torque (M0) | 1.0 Nm |
| Maximum Torque (Mmax) | 3.0 Nm |
| Rated Speed (nN) | 2500 rpm |
| Maximum Speed (nmax) | 4500 rpm |
| Rated Power (PN) | 0.26 kW (continuous) |
| Peak Power | 0.78 kW |
| Rated Voltage (UN) | 400 V AC (three-phase) |
| Rated Current (IN) | 0.85 A |
| Phase Resistance (R) | 3.2 Ω (20°C) |
| Phase Inductance (L) | 8.5 mH |
| Moment of Inertia (Jm) | 0.00035 kg·m² (350 g·cm²) |
| Protection Class | IP65 (with connector) |
| Insulation Class | F (155°C) |
| Ambient Temperature Range | -10°C to +40°C |
| Weight | Approximately 4.2 kg |
| Connector Type | M23 x 12-pin (power + encoder) |
Functional Features:
- Multi-turn absolute encoder with 4096 turns resolution — position is retained across unlimited rotations and power cycles
- Smooth shaft enables use of clamping hubs / shrink-disc couplings for zero-backlash connection
- Natural convection cooling — silent operation, no external fan required
- High dynamic response suitable for fast pick-and-place and high-speed indexing
- Compatible with Baumüller b maXX 5000, b maXX 3000, b maXX 2500 servo drives
Structural Characteristics:
- Housing Material: Aluminum alloy die-cast, anodized surface treatment
- Stator Lamination: Grain-oriented silicon steel, 0.35 mm lamination thickness
- Rotor: NdFeB permanent magnet, 4-pole or 6-pole configuration
- Bearings: Precision deep-groove ball bearings, sealed, grease-lubricated, L10 ≥ 25,000 hours
- Shaft Material: Hardened and ground C45 steel (1.0503), surface roughness Ra 0.4 µm
- Shaft Diameter: 28 mm (smooth)
Working Principle:
The motor functions as a synchronous permanent magnet servo motor. Three-phase sinusoidal currents from the servo drive create a rotating magnetic field in the stator. The NdFeB permanent magnet rotor synchronously follows this field. The multi-turn absolute encoder uses a Wiegand wire or battery-backed memory to store absolute position across unlimited revolutions. The servo drive continuously compares commanded position with encoder feedback, adjusting current to achieve precise motion control.
Advantages & Highlights:
- Multi-turn absolute encoding — no homing required after power-off, position retained across thousands of revolutions
- Smooth shaft design — eliminates keyway stress concentration, enables higher torque transmission via clamping
- Higher torque density compared to BM4426 — suitable for medium-load applications
- Low acoustic noise due to natural cooling and precision-balanced rotor
- Wide operating temperature range with F-class insulation
Applicable Industries:
- CNC machine tool axes (X/Y/Z)
- Industrial robots (medium payload)
- Injection molding machines
- Metal forming and stamping presses
- Conveyor and material handling systems
- Woodworking machinery
- Glass processing equipment
Installation Requirements:
- Mounting: Flange mounting (B5) or foot mounting (B3) — standard square flange with 4×M6 mounting holes
- Flange bolt tightening torque: 12 Nm
- Shaft coupling: Use clamping hub coupling (e.g., RINGFEDER, BIKON) — smooth shaft required
- Recommended coupling bore: 28 mm H7 tolerance
- Cable entry: M23 connector, cable gland PG16 recommended
- Minimum clearance for cooling: 150 mm on top and sides, 50 mm at rear
Usage Precautions:
- Smooth shaft requires clamping-type coupling only — never use keyed couplings
- Maximum permissible radial load on shaft: 200 N, axial load: 80 N
- Do not operate above 40°C ambient temperature without derating
- Encoder multi-turn counter requires initialization via drive parameter after first commissioning
- Avoid exposure to corrosive gases or liquids — IP65 rating does not cover submersion
