8LSA57.S1045D200-1 by B & R Automation

The 8LSA57.S1045D200-1 synchronous motor is produced by B&R Automation for the 8LS Synchronous Motors series. This three-phase unit serves as a rotary actuator in automated machinery, supplying continuous, position-controlled torque to axes that demand high-speed indexing. The standard 8LSA configuration does not use a reinforced bearing, which helps keep mass and inertia low for general-purpose servo tasks. Its mounting flange interface matches common machine frames, and the motor pairs with a B&R servo inverter to close the velocity and position loops by means of built-in optical feedback.

Mechanical connection is handled by a 142 mm flange that centers the stator and accepts through-bolts, and the rated top speed is 4500 rpm. Position data is generated by an Optical EnDat encoder that uses protocol release 2.2, so the drive receives absolute single-turn and multi-turn information without additional wiring. An integrated standard holding brake clamps the shaft when power is removed, allowing vertical loads to stay in place. The encoder resolution reaches 25 bits for single-turn operation and 12 bits for multi-turn operation, and the memory tracks up to 4096 complete revolutions for homing-free restarts.

Thermal management relies on self-cooling with free circulation, eliminating the need for external fans or liquid lines and making cabinet layout simpler. Power and feedback conductors exit through an angled swivel connector so cable loops clear adjacent axes, and the housing provides a smooth shaft end that mates with compression couplings instead of keyed hubs. The size indicator is length code 7, which balances torque and overall installation depth. The absence of an oil seal limits use to clean, dry environments, and the multi-turn counter retains position data during power loss.