8JSA54.EA028D100-0 by B & R Automation

The 8JSA54.EA028D100-0 synchronous motor is produced by B&R Automation for the 8JS Synchronous Motors series. It converts three-phase electrical input into tightly regulated mechanical motion for automated positioning, conveying, and indexing tasks in industrial machinery. The motor is intended for axes that need accurate rotary control, repeatable movement, and stable speed during frequent starts and stops. Its synchronous design supports coordinated operation with a matching drive in machines that rely on predictable shaft response. In packaged automation systems, this type of motor is commonly used where acceleration and deceleration must remain closely controlled throughout repeated cycles.

Thermal management is handled through self-cooling, so the housing dissipates heat without auxiliary fans or liquid circuits. Position feedback comes from an inductive encoder with a precision of ±180 arcsec, which limits static position error during controlled moves. Its resolution of 19/0 bits provides fine angular information, and the encoder communicates through the Inductive EnDat 2.1 protocol over a bidirectional serial link. Because it is a single-turn encoder, the system reports absolute angle within one revolution, while longer travel is tracked by the control system. That arrangement keeps feedback integrated with the motor and supports direct exchange of position and diagnostic data. The motor is supplied without a holding brake and without an oil seal, so external means are required when the application must hold position at standstill or operate near fluids.

The motor uses flange mounting for direct attachment to a machine plate, and power plus feedback conductors leave through an angled swivel connector that helps keep cable routing close to the housing. The connector orientation is useful where rear clearance is limited or where the cable must follow a controlled bend path immediately after it exits the motor. The nominal operating speed is 2750 rpm, making it suitable for conveyors, indexing tables, and other rotary axes that need steady rated operation. Torque is transmitted through a keyed shaft, which helps prevent relative movement between the shaft and the coupled component. A keyed interface is commonly paired with couplings, pulleys, or gear inputs that require secure torque transfer. Motor size code 5 and length code 4 determine the overall frame dimensions, so the available installation space and mating parts must match the motor layout.