B&R 8MSA3L.E0-31

Product Introduction:

The B&R 8MSA3L.E0-31 is a compact synchronous servo motor from the ACOPOS 8M series, designed for high-precision, space-constrained motion applications. It features a rated torque of 2.7 Nm, a rated speed of 3,000 rpm, and an integrated multi-turn absolute encoder (EnDat 2.2). The motor is optimized for direct drive applications with a hollow shaft design allowing cable routing through the motor.

Technical Specifications:

Functional Features:

• Hollow shaft design — cables pass directly through the motor, eliminating external cable loops
• Integrated absolute encoder (EnDat 2.2) — no homing required after power loss
• High torque density: 2.7 Nm in Ø 115 mm package
• Low cogging torque — smooth motion at low speeds (< 1 rpm)
• Integrated temperature sensor (PTC) — motor thermal protection
• Balanced rotor design — vibration-free operation up to 6,000 rpm

Performance Parameters:

Structural Features:

• Compact cylindrical design — Ø 115 mm, length 185 mm
• Hollow shaft Ø 24 mm — internal cable routing, through-bore for pneumatic lines
• Stainless steel housing — corrosion-resistant, suitable for food & pharma
• Connector: M23 12-pin — power + encoder + temperature sensor in single connector
• Mounting: Flange mounting (4× M6 threaded holes), IEC 115 flange pattern
• Balancing grade: G 2.5 (ISO 1940) — low vibration at high speed

Working Principle:

The 8MSA3L.E0-31 is a permanent magnet synchronous motor (PMSM) with surface-mounted NdFeB magnets on the rotor. The stator contains 3-phase windings arranged for sinusoidal back-EMF.  The hollow shaft allows integration of pneumatic tubes, cable harnesses, or cooling lines directly through the motor body.

Key Advantages:

• IP65 sealed housing — operates in washdown and dusty environments without additional protection
• Hollow shaft Ø 24 mm — unique cable routing capability, reduces machine footprint
• EnDat 2.2 multi-turn absolute encoder — zero homing time, absolute position retention
• 2.7 Nm in Ø 115 mm — highest torque density in its class
• G 2.5 dynamic balancing — smooth operation at 6,000 rpm with minimal vibration

Installation Requirements:

• Mounting: IEC 115 flange — 4× M6 bolts, torque 12 Nm max
• Shaft Coupling: Use zero-backlash bellows coupling — max misalignment 0.1 mm radial, 0.1° angular
• Cable Connection: M23 12-pin connector — tighten to 5 Nm torque
• Ambient: -10°C to 55°C — do not expose to direct water jets (IP65 = water jets from any direction, not immersion)

Usage Precautions:

• Do not exceed 6,000 rpm — bearing speed limit, overspeed causes mechanical failure
• Hollow shaft must not be used for torque transmission — it is for cable/air routing only
• Encoder cable (EnDat 2.2) must not be bent below 50mm radius — signal loss occurs
• PTC temperature sensor must be connected to drive — disconnection disables thermal protection
• Do not disassemble motor housing — loss of IP65 rating and magnet demagnetization risk