8LSC74.EA045D011-3 by B & R Automation

The 8LSC74.EA045D011-3 is a three-phase synchronous servo motor manufactured by B & R Automation as part of the 8LS Synchronous Motors series. It is intended for precision positioning and speed control in automated machinery and robotic axes. The motor is suited to applications that require repeatable motion, stable velocity regulation, and rapid response to changing load conditions. Reinforced front-end bearing support and an internal fan allow it to handle continuous motion profiles during extended industrial operation.

The motor uses a mounting flange with a 190 mm dimension, a smooth shaft, and an angled swivel connector that routes power and feedback cables away from moving structures. This layout helps keep cable bends controlled near the motor and supports installations with limited clearance around the housing. The reinforced A-side bearing supports radial loads from belt drives, while the built-in fan moves cooling air across the stator. Electrically, the winding produces a nominal torque of 24.6 Nm at a rated speed of 4500 rpm when it draws a nominal current of 22.57 A. The winding has a stator inductance of 2.2 mH, a resistance of 0.13 ?, and an electrical time constant of 16.92 ms. Position feedback is provided by an inductive EnDat 2.1 encoder with 19-bit single-turn capability, and the motor comes without an oil seal or holding brake.

For short acceleration periods, the motor can reach 150 Nm of maximum torque and accept a maximum current of 202 A. Stall limits are 43 Nm and 39.45 A, which indicate additional low-speed capability when the axis is heavily loaded or holding against disturbance forces. Rotor behavior is influenced by a 60 kg·cm² inertia, so the mechanical load should be matched to the required axis response. The magnetic circuit develops a torque constant of 1.09 Nm/A, and the back-electromotive force rises at 65.97 V per 1000 rpm. The internal fan supports a thermal time constant of 41 minutes during sustained operation.