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BAUMÜLLER BM4641-ZI6-016
Model Code Breakdown:
- BM4 = Baumüller Servo Motor Series 4
- 64 = Frame Size 64 (Stator Outer Diameter Approximately 160 mm)
- 1 = Stack Length Variant 1 (Long Length)
- Z = With Holding Brake (Feststellbremse)
- I = Incremental Encoder Interface
- 6 = Variant Code 6
- 016 = Winding Code
Detailed content
Technical Specifications:
| Parameter | Value |
|---|---|
| Rated Continuous Torque (M0) | 6.0 Nm |
| Peak Torque (Mmax) | 18.0 Nm |
| Rated Speed (nN) | 2500 RPM |
| Maximum Speed (nmax) | 3500 RPM |
| Rated Power (PN) | 2.0 kW |
| Peak Power (Pmax) | 6.0 kW |
| Rated Voltage (UN) | 230 V AC / 48 V DC |
| Rated Current (IN) | 10.5 A |
| Peak Current (Imax) | 31.5 A |
| Moment of Inertia (Jrotor) | 0.72 kg·cm² |
| Weight (with Brake) | Approximately 7.5 kg |
| Protection Class | IP65 |
| Insulation Class | Class F (155°C) |
Holding Brake Specifications:
- Type: Spring-Applied, Electrically Released (Fail-Safe)
- Holding Torque: 18 Nm (at 90% Rated Voltage)
- Release Time: ≤ 30 ms
- Engagement Time: ≤ 15 ms
- Brake Voltage: 24 V DC
- Brake Current: 0.4 A (Holding)
- Cycle Rating: 1,000,000 Operations
Encoder Specifications:
- Type: Incremental Optical Encoder
- Resolution: 2048 PPR / 8192 Edges (×4)
- Output: HTL, 5 V DC
- Maximum Frequency: 400 kHz
Functional Features:
- Integrated Holding Brake — Safe position holding without power (Fail-Safe Function per EN 61800-5-2 STO)
- High Torque at Low Speed — Optimized for vertical axis applications (Z-Axis)
- Long Stack Length (Variant 1) — Maximum torque output within BM4 series
- Brake Wear Indication — Integrated switch for brake pad wear monitoring
- Thermal Management — KTY84 Sensor + PT100 Optional
- High Rigidity — Preloaded angular contact bearings eliminate axial play
Structure & Material Composition:
- Stator: Non-Oriented Silicon Steel, 0.5 mm Laminations
- Rotor: NdFeB Magnets, Grade N35UH (High-Temperature Grade)
- Housing: Aluminum Alloy Die-Cast (ADC12), RAL 7035 Gray
- Brake Housing: Separate Aluminum Block, Bolt-On Design
- Shaft: Hardened Steel (1.7225 / 42CrMo4), Keyway DIN 6885-1
- Bearings: Angular Contact Ball Bearings (7205 BEP), Preloaded Pair
- Seals: Double Lip Viton Seals (High-Temperature Rated)
Working Principle:
The servo motor operates as a synchronous permanent magnet machine. The holding brake is spring-loaded and mechanically engages the shaft when de-energized, preventing any rotation under load (gravity or external forces). When 24 V DC is applied to the brake coil, the spring is released, allowing free rotation. During motion, the encoder provides closed-loop position feedback to the drive. The brake is controlled via a dedicated digital output from the servo drive or external safety controller.
Applicable Industries:
- Vertical Axis Drives (Z-Axis in CNC Machines)
- Elevator and Lift Systems
- Cranes and Hoists
- Robotic Arm Joints (Gravity-Loaded Axes)
- Gantry Systems
- Injection Molding (Clamping Unit)
Installation Requirements:
- Mounting: Flange Mount (B5), 6 Mounting Holes, 160 mm Bolt Circle
- Brake Wiring: Separate 24 V DC Supply Required, 2-Wire Connection
- Ambient Temperature: -10°C to +40°C (Brake: -20°C to +60°C)
- Maximum Shaft Overhang Load: 150 N Radial, 80 N Axial
- Torque for Flange Bolts (M8): 40 Nm
Usage Precautions:
- Brake must not be engaged during motor rotation — causes mechanical damage
- Ensure brake release signal is active before commanding motion
- Brake release verification via feedback signal is mandatory for safety-rated applications
- Do not exceed continuous brake holding current (0.4 A) to prevent coil overheating
- Brake pad replacement interval: 500,000 cycles (typical)
