8MSA3L.E2-73 B & R Automation
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The B & R Automation 8MSA3L.E2-73 is a three phase synchronous motor from the 8MS series with a nominal rated speed of 3000 rpm and a large relative rated torque. It features a self-cooling system, IP65 protection rating, and a keyed shaft end. This motor uses a single-turn EnDat inductive encoder with a resolution of 32 lines and has an A side connection direction.
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Product Description:
B & R Automation manufactures the 8MSA3L.E2-73 synchronous motor as part of its 8MS Three Phase Synchronous Motors series. This three-phase unit converts electrical energy into controlled mechanical rotation for positioning axes, conveyors, and handling modules in automated production lines. As a member of a modular platform, it shares flange dimensions and connector layouts with other 8MS models, supporting consistent installation and standardized field wiring across different machine frames.
At its rated operating point, the rotor turns at 3000 rpm, a nominal speed that matches common 1:1 gearbox ratios and simplifies velocity profiling in motion controllers. Thermal energy is dissipated by a self-cooling housing, so no external fan or liquid cooling circuit is required. The enclosure carries an IP65 rating, providing resistance to dust ingress and low-pressure water jets when correctly gasketed. Motor power and feedback connectors are oriented on the A-side, which helps route cables away from moving parts in gantry or delta robots. Position feedback begins with an incremental encoder that generates 32 lines per mechanical revolution before electronic interpolation, supporting reliable homing routines for applications that require moderate positioning accuracy.
The feedback system uses EnDat inductive scanning, a communication method that tolerates electrical noise and permits automatic parameter transfer during system setup. The single-turn encoder retains absolute position within one mechanical revolution, enabling an immediate restart after power is restored without requiring batteries. During installation, the shaft can withstand up to 200 N of axial force without affecting bearing preload, which accommodates the forces associated with coupling and pulley attachment. Torque is delivered through a keyed shaft end, providing positive engagement with gears or synchronous belts and preventing slippage under repetitive load cycles.
