8JSA31.E5050D800-0 by B & R Automation

The 8JSA31.E5050D800-0 is manufactured by B&R Automation as part of the 8JS Synchronous Motors series. This unit is a permanent-magnet AC servo motor for precise motion tasks in industrial automation. It is intended for axes that require tight speed regulation and repeatable positioning, including conveyors, pick-and-place heads, and tool changers during repeated production cycles. Its servo design supports coordinated motion where commanded position and actual shaft movement must stay closely matched.

The motor reaches a nominal speed of 5000 rpm, allowing fast cycle execution without mechanical gearing. Position feedback is supplied by an optical encoder with a precision of ±60 arcsec, which limits angular tracking deviation at the controller. Separate coarse and fine encoder tracks provide a resolution of 13/12 bits for single-turn and multi-turn counting, and the absolute revolution register stores 4096 turns so position can be retained after power loss. Communication with the drive uses Optical EnDat 2.1, which carries sensor data, diagnostics, and encoder power on differential signal pairs. Heat is removed by self-cooling, so no external fan or liquid circuit is required. The motor also uses length code 1 and size code 3 to keep the package compact for medium-power axes.

Holding force against back-driving loads is provided by a standard brake rated at 2.5 Nm, which supports safe stopping when motion is interrupted. The frame mounts to the machine by flange mounting, and the hybrid power and feedback cable exits through an angled swivel connector. This connector can be rotated to ease cable routing where panel space is limited. A factory-installed oil seal helps prevent lubricant migration into the bearings during operation. The motor also uses a smooth shaft end that mates with user-supplied couplings or pulleys without key slots, and that shaft form suits clamp-style hubs and similar friction-fit connections.