8LSA37.R2045D300-3 by B & R Automation

The 8LSA37.R2045D300-3 is a three-phase synchronous motor manufactured by B & R Automation within the 8LS Synchronous Motors series. Designed for servo axes, the unit converts electrical power into precise rotary motion to move machinery, indexing tables, or packaging equipment under closed-loop control. Rotor position feedback is supplied by a resolver, which gives analog sine-cosine signals that remain stable in areas with vibration and elevated temperature.

The motor reaches a rated speed of 4500 rpm, so it can support fast cycles without additional gear reduction. Thermal energy is removed by self-cooling through free circulation, eliminating the need for forced-ventilation hardware. Its flange measures 91.3 mm, allowing direct attachment to gearboxes or machine frames that use this interface size. Positioning performance is supported by repeatable backlash of 6 arcmin, which suits moderate-precision pick-and-place tasks. The 8LSA configuration indicates the standard construction used for this motor type without reinforced bearings. Length code 7 corresponds to the stack height used for the stated torque, and product revision 3 is the current electrical and mechanical build.

For static holding or emergency stops, the motor includes a standard holding brake that engages automatically when power is removed. Power and feedback leads exit through an angled swivel conduit box, and terminations are made with a keyed connector for secure electrical connection. The unit bolts to machinery through a mounting flange, and the shaft is supplied with a key to help prevent coupling slip under load. An oil seal is not present, so the front bearing zone must remain free of liquid contamination. Because the motor does not include reinforced bearings, axial and radial loads must stay within the limits for the standard 8LSA construction.