Product Short Description
Product Introduction:
The 8MSA3M is a compact permanent‑magnet synchronous servo motor from B&R’s 8MSA family, frame size 3 with “M” (medium) inertia variant. It balances dynamic response with torque capacity, integrating a multi‑turn absolute optical encoder for high‑resolution position feedback without homing sequences.
Description
Technical Specifications (representative 8MSA3M.R0‑42):
|
Parameter
|
Value
|
|---|---|
|
Rated torque (continuous)
|
0.93 Nm
|
|
Peak torque
|
2.79 Nm
|
|
Rated speed
|
4000 rpm
|
|
Maximum speed
|
6000 rpm
|
|
Rated voltage
|
230 VAC (L‑N)
|
|
Rated current
|
4.2 A
|
|
Peak current
|
12.6 A
|
|
Phase configuration
|
3‑phase
|
|
Torque constant (KT)
|
0.22 Nm/A
|
|
Back‑EMF constant (KE)
|
22 V/1000 rpm
|
|
Electrical time constant
|
3.5 ms
|
|
Mechanical time constant
|
6.8 ms
|
|
Rotor inertia
|
0.00004 kg·m²
|
|
Encoder type
|
Multi‑turn absolute, optical, Sin/Cos + Hiperface DSL
|
|
Encoder resolution
|
20‑bit single‑turn + 12‑bit multi‑turn
|
|
Shaft type
|
Smooth shaft with keyway (DIN 6885‑1, Form A)
|
|
Shaft diameter
|
14 mm
|
|
Shaft length
|
35 mm
|
|
Length code
|
R0 (42 mm flange)
|
|
Weight
|
Approx. 1.2 kg
|
|
Cooling
|
Forced air convection (internal fan)
|
|
Protection class
|
IP65 (with connector)
|
|
Compatible drives
|
B&R ACOPOS 8 (e.g., 8V1016.00‑2, 8V1090.00‑2)
|
Material Composition:
-
Stator laminations: Grain‑oriented silicon steel (FeSi), 0.35 mm thickness
-
Rotor: High‑coercivity permanent magnets (NdFeB, N42SH grade)
-
Housing: Aluminium alloy (EN AC‑46000), anodised
-
Shaft: Hardened alloy steel (C45E), chrome‑plated
-
Bearings: Deep‑groove ball bearings, sealed, grease‑lubricated (6000 series)
-
Connector: M23 connector, gold‑plated contacts, IP67 rated
Structural Features:
-
Cylindrical housing with integral cooling fan
-
Front‑side connector for power and encoder
-
Compact 42 mm flange design for space‑constrained applications
-
Keyed shaft per DIN 6885‑1 for positive torque transmission
Functional Features:
-
Integrated multi‑turn absolute encoder eliminates need for reference run after power loss
-
Sin/Cos and Hiperface DSL interfaces for high‑resolution position feedback
-
High dynamic response with low rotor inertia
-
Intelligent thermal management with built‑in temperature sensor (PTC/KTY)
-
Plug‑and‑play compatibility with B&R ACOPOS servo drive series
Working Principle:
The 3‑phase stator winding, energised by the ACOPOS drive with sinusoidal PWM, creates a rotating magnetic field. The NdFeB rotor follows this field, with position feedback from the absolute optical encoder closing the servo loop for precise torque, speed, and position control.
Application Scenarios:
-
Packaging machinery
-
Printing and converting equipment
-
CNC machining centres (tool changer, auxiliary axes)
-
Robotics and pick‑and‑place systems
-
Textile machinery
-
Food and beverage automation
Installation Requirements:
-
Mount on a rigid, flat surface using four M5 bolts, torque 2.5 N·m
-
Ensure minimum 50 mm clearance around the motor for airflow (forced convection fan)
-
Use shielded cable for encoder and power connections
-
Grounding resistance must be ≤ 1 Ω
-
Ambient temperature: –10 °C to +55 °C
-
Connect motor to compatible B&R ACOPOS drive (e.g., 8V1016.00‑2)
Usage Precautions:
-
Do not exceed rated peak current for more than 5 seconds
-
Do not disassemble the encoder housing – calibration will be lost
-
Ensure proper cable strain relief at the M23 connector
-
Regularly check bearing condition after 10,000 operating hours
-
Do not operate in corrosive atmospheres without additional enclosure
-
The internal fan requires clean air; filter intake in dusty environments
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