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BAUMÜLLER BM4426-ST1-013 00-03
Model Series: BM44 Series — Compact Synchronous Servo Motor
Product Introduction:
The BM4426-ST1-013 00-03 is a compact-frame synchronous servo motor manufactured by Baumüller Nürnberg GmbH. It belongs to the BM44 product family designed for high-dynamic motion control applications requiring precise positioning, high torque density, and reliable continuous operation.
Detailed content
Type Designation Breakdown:
- BM44 — BM44 Series Servo Motor
- 26 — Frame Size 26 (outer diameter approximately 115 mm)
- S — Synchronous Servo Motor
- T — Shaft with Keyway, Natural Convection Cooling (Self-Cooled)
- 1 — Single-Turn Absolute Encoder
- 013 — Winding/Configuration Code
- 00-03 — Version/Revision Code
Technical Specifications:
| Parameter | Value |
|---|---|
| Frame Size | 26 |
| Stator Outer Diameter | 115 mm |
| Motor Length | Short/Compact |
| Cooling Method | IC 411 — Natural Convection (Self-Cooled) |
| Shaft Type | With Keyway (DIN 6885-1) |
| Encoder Type | Single-Turn Absolute Encoder (EnDat 2.1 / Hiperface DSL compatible) |
| Encoder Resolution | 128 sinusoidal periods per revolution (default) |
| Rated Torque (M0) | 0.42 Nm |
| Maximum Torque (Mmax) | 1.26 Nm |
| Rated Speed (nN) | 3000 rpm |
| Maximum Speed (nmax) | 6000 rpm |
| Rated Power (PN) | 0.13 kW (continuous) |
| Peak Power | 0.40 kW |
| Rated Voltage (UN) | 230 V AC (or 400 V AC depending on winding) |
| Rated Current (IN) | 0.65 A |
| Phase Resistance (R) | 4.8 Ω (20°C) |
| Phase Inductance (L) | 6.2 mH |
| Moment of Inertia (Jm) | 0.00008 kg·m² (80 g·cm²) |
| Protection Class | IP65 (with connector) |
| Insulation Class | F (155°C) |
| Ambient Temperature Range | -10°C to +40°C |
| Weight | Approximately 1.8 kg |
| Connector Type | M23 x 12-pin (power + encoder) |
Functional Features:
- Single-turn absolute encoder provides position feedback immediately upon power-on without homing sequence
- Keyed shaft ensures secure mechanical coupling to gearboxes, pulleys, or lead screws
- Natural convection cooling eliminates the need for external fans, reducing noise and maintenance
- High torque-to-inertia ratio enables rapid acceleration and deceleration cycles
- Baumüller b maXX 5000 / b maXX 3000 drive compatible for seamless integration
Structural Characteristics:
- Housing Material: Aluminum alloy die-cast with high thermal conductivity
- Stator Lamination: Grain-oriented electrical steel, low iron loss
- Rotor: Permanent magnet rotor with NdFeB (Neodymium-Iron-Boron) rare-earth magnets, surface-mounted or inset design
- Bearings: Deep-groove ball bearings, sealed, maintenance-free rated life L10 ≥ 20,000 hours
- Shaft Material: Hardened and ground steel, C45 / 1.0503
Working Principle:
The motor operates on the synchronous permanent magnet principle. The stator windings generate a rotating magnetic field when supplied with three-phase AC current from the servo drive. The permanent magnet rotor locks to this rotating field and rotates synchronously. The absolute encoder mounted on the shaft provides real-time angular position data to the servo drive, enabling closed-loop position, velocity, and torque control.
Advantages & Highlights:
- Compact design with high power density — ideal for space-constrained installations
- Absolute encoder eliminates homing requirement after power loss
- IP65 protection allows use in dusty and wet industrial environments
- Low cogging torque ensures smooth motion at low speeds
- Wide speed range from 0 to 6000 rpm with constant torque up to rated speed
Applicable Industries:
- Packaging machinery
- Printing and converting machines
- Small CNC axes
- Robot joint axes (small payload)
- Textile machinery
- Semiconductor handling equipment
- Medical device actuators
Installation Requirements:
- Mounting orientation: Any (B3/B5/B35 flange mounting available)
- Flange type: Square flange with 4 mounting holes (M5)
- Tightening torque for flange bolts: 8 Nm
- Shaft coupling: Use flexible coupling to compensate for misalignment (max. radial offset 0.1 mm, angular offset 1°)
- Cable entry: M23 connector, cable gland PG13.5 recommended
Usage Precautions:
- Do not exceed maximum continuous torque to prevent demagnetization of permanent magnets
- Ensure adequate ventilation even with natural cooling — minimum 100 mm clearance on all sides
- Do not subject the shaft to axial loads exceeding 50 N or radial loads exceeding 150 N
- Store in dry environment; if unused for >6 months, rotate shaft manually every 30 days
- Encoder cable must be shielded and routed separately from power cables (min. 100 mm distance)
