8LSA54.DB020S900-3 B & R Automation
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The B & R Automation 8LSA54.DB020S900-3 is a three-phase synchronous motor from the 8LS Synchronous Motors series. It has a 142 mm flange dimension, includes a standard holding brake, and uses inductive EnDat encoder technology with multi-turn capability of 4096 revolutions. The motor features a self-cooling principle, a single-cable hybrid connector, and a rated speed of 2000 rpm.
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Product Description:
The 8LSA54.DB020S900-3 is a three-phase synchronous motor manufactured by B&R Automation for the 8LS Synchronous Motors series. In factory automation, the unit couples directly to gearboxes or belt drives, converting electrical energy from a servo inverter into controlled rotation for positioning, indexing, or continuous-speed tasks. Its compact frame allows the motor to fit into machines with limited installation space and strict inertia constraints. The synchronous design supports precise torque regulation when the motor is paired with a compatible servo drive.
Mounting is handled by a flange that measures 142 mm square, providing clearances compatible with IEC size-142 gear stages. Position feedback comes from an inductive EnDat transducer, which is less sensitive to light contamination and shock than an optical feedback device. The interface uses EnDat version 2.2, allowing its cable length and communication rate to match modern B&R inverters. Under nominal conditions, the rotor reaches 2000 rpm, balancing rotational speed with the motor’s available torque and passive heat dissipation. The encoder provides 19/12 bits of single-turn and multi-turn resolution, allowing the controller to determine position accurately without an external sensor. The motor has length code 4 and product revision 3. A keyed connector carries the required power and signal connections while maintaining secure alignment at the connection point.
A standard holding brake locks the shaft when the drive disables torque, preventing vertical or suspended loads from drifting. Heat removal relies on self-cooling through natural airflow along the housing fins, so the motor does not require forced ventilation or an external fan. Power, feedback, and brake conductors are combined in a single-cable solution, reducing the number of separate connections that must be routed through the machine. The supplied connector seals the cable interface and helps protect the electrical contacts from contaminants. Absolute position tracking has a multi-turn range of 4096 revolutions, allowing the controller to retain the rotor’s position across multiple shaft rotations after a power interruption. The motor uses a standard bearing arrangement without reinforcement. An oil seal is fitted at the output end to limit contaminant entry, while the keyed shaft provides positive torque transmission to the connected mechanical load.
