Product Short Description
Product Introduction:
The 8MSA4L is a medium‑inertia permanent‑magnet synchronous servo motor from B&R’s 8MSA family, frame size 4. It is designed for high‑precision, high‑dynamic industrial automation applications where moderate torque and excellent controllability are required. The motor features a 22‑bit absolute encoder as standard.
Description
Technical Specifications (representative 8MSA4L.R0‑31):
|
Parameter
|
Value
|
|---|---|
|
Rated power (continuous)
|
0.75 kW
|
|
Rated torque
|
2.4 Nm
|
|
Peak torque
|
7.2 Nm (duration ≤ 1 s)
|
|
Rated speed
|
3000 rpm
|
|
Maximum speed
|
4500 rpm
|
|
Encoder type
|
22‑bit single‑turn absolute EnDat 2.2 (standard)
|
|
Shaft type
|
Smooth shaft with keyway (DIN 6885)
|
|
Flange size
|
56 mm shaft diameter (IEC B5)
|
|
Cooling
|
Natural convection (self‑cooling, no fan)
|
|
Protection class
|
IP65 (shaft end), IP66 (shaft seal)
|
|
Insulation class
|
F (155 °C)
|
|
Holding brake
|
Optional
|
|
Magnet material
|
Rare‑earth permanent magnet (NdFeB)
|
|
Mounting
|
IEC B5 flange
|
|
Compatible drives
|
B&R ACOPOS / ACOPOSmulti / ACOPOS P3
|
|
Plug‑and‑play
|
Yes, automatic motor recognition via drive
|
|
Certifications
|
CE, UL, cUL, RoHS, ATEX (optional)
|
Functional Features:
-
Standard 22‑bit high‑resolution absolute encoder – no homing after power‑down
-
Medium rotor inertia balances dynamic response with load matching
-
Natural convection cooling (fan‑less) for maintenance‑free operation
-
Extremely low torque ripple due to optimised electromagnetic design
-
Seamless integration with ACOPOS drive ecosystem via automatic parameter identification
-
IP65/IP66 sealing for harsh industrial environments
Material & Structural Characteristics:
-
Stator: Silicon steel laminations, optimised for low harmonic distortion
-
Rotor: NdFeB rare‑earth permanent magnets, surface‑mounted
-
Housing: Aluminium alloy, anodised for corrosion resistance
-
Shaft: Hardened alloy steel, chrome‑plated, keyway per DIN 6885
-
Bearings: Sealed deep‑groove ball bearings, grease‑lubricated
-
Cooling: Natural convection via finned aluminium housing – no internal fan
Working Principle:
A 3‑phase permanent‑magnet synchronous motor driven by sinusoidal PWM from the ACOPOS inverter. The 22‑bit absolute encoder provides high‑resolution rotor position feedback to the drive’s field‑oriented control algorithm, ensuring precise torque and speed regulation even at very low speeds.
Application Scenarios:
-
Electronic assembly and PCB manufacturing
-
Precision packaging machinery
-
Printing equipment (register control, tension control)
-
Robotics requiring synchronous multi‑axis operation
-
High‑precision positioning tables and indexing axes
Installation Requirements:
-
IEC B5 flange mounting with appropriate bolt torque
-
Minimum 50 mm clearance around motor body for natural convection cooling
-
Use shielded motor and encoder cables
-
Earth ground resistance ≤ 1 Ω
-
For brake option, connect brake power to drive’s dedicated output
-
Ambient temperature 0–40 °C for full rating; extended range –15 to 55 °C with derating
Usage Precautions:
-
Peak torque of 7.2 Nm is permitted only for ≤ 1 second duration
-
Do not exceed maximum speed of 4500 rpm
-
The natural‑convection design relies on ambient airflow; do not enclose without ventilation
-
Do not disassemble encoder – calibration loss is permanent
-
Ensure load inertia ratio is within drive‑recommended limits (typically ≤ 10:1) for stable control
-
Replace bearings preventively after 20,000 operating hours in continuous duty
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