8LSA25.S9045S300-3 by B & R Automation

The 8LSA25.S9045S300-3 synchronous motor is produced by B&R Automation and belongs to the 8LS Synchronous Motors series. This three-phase unit supplies mechanical power for positioning and velocity tasks inside automated machinery, where closed-loop servo control is required. Its synchronous design allows a compatible drive to regulate torque, speed, and position with repeatable response during cyclic machine motion. In servo applications, this supports accurate starts, stops, and speed changes under feedback-based control.

With a rated speed of 4500 rpm, the motor can maintain moderate rotor velocity without entering field-weakening mode. The motor uses a mounting flange diameter of 58 mm for attachment to gearboxes or machine frames. Position feedback is generated by an Inductive EnDat sensor operating on EnDat 2.2 signaling, allowing digital transmission of absolute position data. The built-in encoder provides 19/12-bit single-turn and multi-turn resolution, and its multi-turn counter stores up to 4096 revs so the controller can recover the absolute angle after power loss. Motion can be held during shutdown by a standard holding brake, and the keyed shaft end transmits torque without slip. Length code 5 identifies the active stack depth used for this motor.

Electrical power and feedback share one cable through the single-cable solution, reducing cabinet wiring and the number of external connections around the axis. Heat is removed by a self-cooling concept that relies on free air circulation, so no forced ventilation is required. The motor is delivered in configuration 8LSA with standard construction and no reinforced bearing, and it mounts directly by its flange. An oil seal is not present, so the mating machine side must remain free of lubricant ingress. Product revision 3 identifies the current design stage. This version is suited to general-purpose servo axes that do not require a reinforced bearing arrangement.