Product Description:

The 8MSA4M.R0-B5 synchronous motor is built by B&R Automation for the 8MS Three Phase Synchronous Motors series. As an electromechanical actuator, it converts three-phase power from a drive controller into precisely regulated torque and speed, allowing conveyor sections, pick-and-place axes, or packaging spindles to be positioned accurately inside automated production cells. Its compact construction and feedback interface make it suitable for distributed servo architectures where cabinet space is limited.

Electrical and feedback conductors exit on side B, so clearance is needed on that face when routing cables. Heat is removed through self-cooling, which means the housing acts as the sole heat sink without auxiliary blowers or liquid jackets. Under nominal load, the rotor reaches 3000 rpm, a speed that aligns with standard 1:1 belt drives for tool shafts. Its torque rating is medium, indicating a balance between continuous stall torque and compact mass within the 8MS range. Because the motor is supplied without a holding brake, mechanical locking or drive-based torque must secure the axis at power-off. The frame corresponds to motor size 4, giving moderate inertia for general-purpose motion tasks.

Rotor position is measured by a resolver, offering fault-tolerant sine-cosine feedback suited to environments with electrical noise. The BRX variant limits nonlinearity to ±1 angular minute and maintains overall resolver precision within ±10 angular minutes, allowing the drive to interpolate fine position loops. The construction uses length code M, providing a mid-span rotor and stator length that maintains thermal stability while keeping weight reasonable. A keyed shaft end simplifies torque transfer to gears or pulleys and helps prevent slip under acceleration. No oil seal is installed, so external sealing is required if contamination from lubricants or coolants is expected.