B&R 8MSA4S

Technical Specifications

• Cooling Method: Self‑cooling
• Frame Size: Size 4, short‑stack‑length variant
• Nominal‑speed Range: 3000 rpm / 6000 rpm (model‑variant‑dependent)
• Feedback‑device Options: Resolver, EnDat 2.1 / EnDat 3 encoder
• Degree of Protection: IP65 at shaft‑end and connector
• Shaft Options: Smooth shaft, keyed shaft; optional holding‑brake
• Certifications: CE, UKCA, UL component‑certification

Functional Features

• Short‑stack‑compact mechanical‑design for limited‑installation‑space‑conditions
• Retain low‑cogging‑torque magnetic‑design for smooth‑rotation‑performance
• Embedded motor‑parameter‑chip for automatic servo‑drive‑recognition
• Compatible with openSAFETY safety‑motion‑control system
• Full‑range mechanical‑option‑support: brake, oil‑seal, reinforced‑bearing, shaft‑form‑selection
• Standard Size‑4 flange‑interface for mechanical‑interchange‑ability with 8MSA4L

Application Scenarios Compact‑layout packaging‑machines, small‑gantry‑automation‑axes, special‑purpose‑automated‑equipment, converting‑machinery axes with strict‑space‑constraints.

Material Composition

• Housing: Aluminum‑alloy die‑cast cooling‑fin housing (short‑stack‑length)
• Rotor: Rare‑earth permanent‑magnet rotor (short‑stack‑version)
• Stator: Short‑stack laminated silicon‑steel‑sheet stator with copper‑windings
• Output‑shaft: High‑strength alloy‑steel shaft
• Connector: Metal‑shielded industrial servo‑connector assembly

Structural Characteristics Size‑4 standard square‑flange, shortened stator‑stack‑length reduces overall motor‑body‑length. Self‑cooling fin‑structured aluminum housing. Non‑drive‑end accommodates feedback‑encoder; optional integrated holding‑brake unit. Rotatable angled servo‑connector for flexible‑cable‑routing.

Working Principle Permanent‑magnet synchronous‑motor operating‑mechanism. Servo‑drive outputs three‑phase sinusoidal‑current to stator windings to generate rotating‑magnetic‑field, driving permanent‑magnet rotor to produce output‑torque. Feedback‑sensor feeds real‑time position‑speed‑data back to drive for closed‑loop motion‑control.

Installation Requirements

• Flange‑mount installation, ensure mounting‑face flatness meets specification
• Reserve surrounding‑space for natural‑convection‑heat‑dissipation
• Use manufacturer‑specified shielded power‑cable and feedback‑cable
• Operate within allowable shaft radial‑axial‑load limits
• Reliable protective‑earth‑connection required

Usage Notes

• Short‑stack‑motor has lower continuous‑torque rating than 8MSA4L; do not overload
• Avoid mechanical‑shock damage to shaft and encoder‑rear‑end in handling‑installation
• Brake‑equipped models must apply correct brake‑release‑voltage
• Implement proper EMC grounding for motor‑cable shielding layer