8JSA54.E7028D300-0
The 8JSA54.E7028D300-0 synchronous motor is manufactured by B&R Automation and belongs to the 8JS Synchronous Motors series. Designed for closed-loop positioning and speed control in industrial automation, the unit converts drive output into mechanical rotation for axes that demand medium inertia and repeatable accuracy. Its keyed shaft fits directly to couplings or gear stages, while the flange housing allows direct integration without additional brackets. The motor has size code 5 and length code 4, making it suitable for compact packaging machines and small gantry axes.
At a nominal speed of 2750 rpm, the rotor delivers constant velocity compatible with mid-range servo drives. Heat is removed through a self-cooling design, eliminating external blowers and reducing panel complexity. The optical EnDat 2.1 encoder generates 2048 lines per revolution, and interpolation refines positional feedback to ±20 arcsec of mechanical angle. Inside the readhead, absolute position is digitized with 13/12 bits for single-turn and multi-turn words, so the controller receives high-resolution data immediately after power is applied. These encoder values support tight velocity loops and allow the axis to retain position information after restart.
A standard holding brake supplies 14.5 Nm of static torque, allowing vertical or safety-critical axes to remain locked during power loss. Multi-turn tracking extends across 4096 revolutions, enabling position retention over long strokes without batteries. Power and feedback cables exit through an angled swivel connector, simplifying routing in crowded cabinets, and installation is based solely on flange mounting. Because there is no oil seal, the motor should be placed in dry zones or paired with an external shaft seal if fluids are present. The keyed shaft and integrated brake suit applications that require secure shaft coupling and holding capability at standstill.
