8JSA42.EB035D000-0 by B & R Automation

The 8JSA42.EB035D000-0 is a synchronous servo motor manufactured by B & R Automation within the 8JS Synchronous Motors series. It combines permanent-magnet torque production with integrated encoder feedback to drive position-controlled axes in automated assembly, material handling, and light machining equipment. Size code 4 and length code 2 give a balanced ratio of inertia to torque, making the motor a general-purpose actuator for systems that demand repeatable speed and position control under closed-loop drive regulation.

The motor reaches a nominal speed of 3500 RPM, so a paired inverter can maintain constant velocity over typical process ranges. Heat is removed by self-cooling, so airflow over the housing is sufficient without external fans or liquid circuits. Installation uses flange mounting, while power and feedback cables exit through an angled swivel connector that can be rotated to clear nearby components. The output shaft is a smooth shaft, allowing backlash-free coupling with clamp collars or hub-style couplings. There is no oil seal on the shaft, and the unit is supplied without a holding brake, so static load retention must be handled externally.

Position feedback is delivered by an inductive multi-turn system. The sensor uses an Inductive EnDat 2.1 interface that transmits absolute position to the drive over a bidirectional serial line. Each mechanical revolution is digitized at a resolution of 19/12 bits S/M, and the internal counter stores up to 4096 turns, eliminating homing after power loss. Angular accuracy is maintained within ±180 arcsec, giving the controller consistent fine-step repeatability during interpolation moves. This feedback arrangement supports synchronized multi-axis motion in packaging, robotics, and conveyor applications.