8JSA54.EB050D200-0 by B & R Automation

The 8JSA54.EB050D200-0 is a synchronous motor manufactured by B & R Automation for the 8JS Synchronous Motors series. The unit acts as the rotary actuator in servo axes, transforming regulated current from a drive inverter into controlled motion for packaging, material-handling, and assembly equipment. Its permanent-magnet construction and integrated encoder let the controller regulate velocity and position without additional sensors. This arrangement keeps the motor compact and helps simplify axis design where tightly synchronized motion is required. It is well suited for motion tasks that need repeatable starts, stops, and speed changes within automated lines.

It delivers a nominal speed of 5000 rpm, enabling high cycle rates when coupled to transmission elements. A holding brake rated at 14.5 Nm keeps the shaft locked during emergency stops or power loss. Position feedback comes from an inductive EnDat 2.1 system that supplies absolute data with 19/12-bit resolution, and the encoder's absolute precision of ±180 arcsec supports accurate index moves and repeatable tool positioning across the full speed range. Because the feedback electronics are multi-turn, the drive can recover the mechanical angle after startup without external homing. Digital feedback also helps maintain stable closed-loop operation when the axis changes direction or follows short positioning moves.

Cooling is provided by self-cooling, so no additional fan or liquid circuit is required. The housing uses flange mounting, and cables exit through an angled swivel connector, which helps when space around the machine frame is limited. An internal counter tracks 4096 complete revolutions to preserve absolute position information during outages. The motor occupies size 5 with a length code of 4, giving a balanced ratio of torque to installation space. The smooth shaft simplifies coupling, and because no oil seal is fitted, the installation area must remain free of pressurized lubricant. The connector position can also reduce cable strain where the motor is installed near guards, frames, or transfer mechanisms.