Product Description:

The 8LSA25.S9045S300-3 is a three-phase synchronous motor manufactured by B&R Automation in the 8LS Synchronous Motors series. Classified under the internal 8LSA designation, it is intended for motion axes on packaging lines, machine tools, and material-handling equipment where coordinated velocity and position control are required. An integrated absolute encoder and a flange-mounting interface permit direct coupling to gearboxes or belt drives, providing closed-loop feedback and torque generation within a single, compact electromechanical unit.

The motor reaches a rated speed of 4500 rpm, supporting fast indexing and short cycle times. Its 58 mm square flange provides a compact mounting footprint for compatible IEC gearheads. Position data come from an inductive EnDat encoder that uses the 2.2 protocol, providing battery-free absolute feedback to the drive controller. Power conductors, the brake supply, and encoder signals are combined in a single-cable hybrid solution, reducing cable-chain weight and installation effort. Heat is removed through self-cooling with free air circulation, so no external fan or liquid circuit is needed for operation with the length code 5 motor stack.

A standard holding brake clamps the rotor when the drive is disabled, preventing load drift on vertical axes or other applications that require stationary holding. The encoder monitors a multi-turn range of 4,096 revolutions, retaining absolute position through power cycles. The A-variant configuration has no reinforced bearing, which reduces friction for light to moderate radial loads while keeping the overall mass low. Torque is transmitted through a shaft end with a key, allowing direct engagement with pulleys, couplings, or gears. The Revision 3 motor is supplied without an oil seal, so external sealing must be provided if lubricant splash is expected.