B&R 8MSA4M.E3-86

Technical Specifications:

Functional Features:

• Multi-turn absolute encoder (Hiperface DSL) for absolute position tracking across power cycles
• High continuous torque output suitable for heavy-load applications
• Integrated PTC thermistor for winding temperature monitoring
• BEMF monitoring for sensorless operation capability (in compatible drives)
• Electronic datasheet (EDS) available for drive parameter auto-configuration

Performance Parameters:

• Torque Constant (Kt): 0.76 Nm/A
• Back-EMF Constant (Ke): 76 V/1000 rpm
• Rated Current: 5.3 A
• Peak Current: 15.9 A
• Electrical Time Constant: 8.2 ms
• Mechanical Time Constant: 18.5 ms
• Rated Power: 1.0 kW

Material Composition:

• Stator Laminations: Grain-oriented silicon steel (FeSi), 0.35 mm, laser-welded stack
• Rotor: NdFeB permanent magnets (N42UH grade), epoxy-coated for corrosion resistance
• Housing: Cast aluminum alloy (EN AC-46000), powder-coated
• Shaft: Hardened chrome steel (42CrMo4), ground and polished
• Bearings: Angular contact ball bearings, preloaded, sealed (7000 series)
• Connector: M23 connector, 19-pin, IP67, gold-plated

Structural Features:

• Larger flange (86 mm) with four M6 mounting holes
• Front-mounted encoder with aluminum protective cap
• Integrated centrifugal cooling fan on non-drive end
• Cable gland entries: 2× PG11
• Shaft with keyway and DIN 6885 retention ring groove

Working Principle:
Permanent magnet synchronous operation. The ACOPOS servo drive supplies three-phase sinusoidal currents to the stator windings, creating a rotating magnetic field. The NdFeB rotor follows this field synchronously. The Hiperface DSL encoder outputs absolute position data via differential RS-485 signals, enabling the drive to execute precise position, velocity, and torque control loops.

Advantages & Highlights:

• 3.2 Nm continuous torque in a compact 86 mm frame
• Absolute multi-turn position without battery backup
• High overload capacity (3× rated torque for short durations)
• Wide operating temperature range (-10°C to +55°C)
• Fully compatible with B&R ACOPOS P3/P6/6D drives

Applicable Industries:

• Metal forming and stamping
• Injection molding machines
• Heavy-duty conveyor systems
• Woodworking CNC routers
• Wind turbine pitch control
• Material handling and logistics

Installation Requirements:

• Mount using four M6 bolts, torque 6 Nm
• Maintain minimum 80 mm clearance on all sides for cooling
• Use B&R recommended shielded motor cable (e.g., 8YS-K0055R0.005-0)
• Ensure drive-to-motor cable length ≤ 10 m for optimal performance
• Ground motor housing to chassis ground (≤ 0.1 Ω)

Usage Precautions:

• Do not operate above 4500 rpm continuously
• Verify encoder cable shielding is connected at both ends
• Replace bearings at 20,000 operating hours or upon vibration increase > 2 mm/s
• Do not apply axial loads exceeding 150 N on the shaft
• Store in dry environment (humidity < 85% RH) when not in use