8MSA4S.E2-73 B & R Automation
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The B & R Automation 8MSA4S.E2-73 is a three phase synchronous motor from the 8MS Three Phase Synchronous Motors series with a motor size of 4 and a keyed shaft end type. This motor is self-cooling, has a rated speed of 3000 rpm, and features an IP65 protection rating. It uses EnDat inductive encoder technology with a single-turn encoder and a resolution of 32 lines.
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Product Description:
The 8MSA4S.E2-73 is a three-phase synchronous motor produced by B & R Automation within the 8MS Three Phase Synchronous Motors series. It serves as a compact drive element that converts inverter power into controlled rotary motion for positioning tables, pick-and-place units, and other repetitive industrial axes. The unit is built to motor size 4 with an S-length housing, giving it a short overall envelope while still providing the torque needed for light to medium loads in automated machinery. That compact form helps the motor fit transfer stations and other machine sections where mounting depth is limited. It is suited to repetitive indexing and steady speed control in compact automation cells.
The motor uses a self-cooling housing, so heat is carried away through surface convection without auxiliary fans or liquid jackets. Its enclosure carries an IP65 rating, protecting internal windings from dust ingress and low-pressure water jets common on processing lines. Under nominal conditions the rotor reaches 3000 rpm, matching standard inverter frequencies for conveyors or tool drives. Position feedback is generated by an EnDat inductive single-turn encoder that communicates digitally with the drive, and its code disk provides 32 lines of base resolution before interpolation. This feedback arrangement supports closed-loop control without adding a separate external sensing device.
To maintain dynamic accuracy, the encoder holds an angular precision of ±400 arcseconds and sustains signal integrity up to ≥ 6 kHz at -3 dB, supporting tight position loops at full speed. Mechanical power exits through a keyed shaft end, and an integrated oil seal helps limit lubricant migration along the shaft bore. Because the design is supplied without a holding brake, applications that need static torque must use external clamping or drive torque. Cabling is routed on the A side, which helps reduce bend-radius conflicts when the motor is installed against bulkheads or inside compact control cabinets.
Frequently Asked Questions about 8MSA4S.E2-73:
Q: What type of shaft end is used in the 8MSA4S.E2-73 motor?
A: The 8MSA4S.E2-73 motor features a keyed shaft end for secure connection to coupled equipment.
Q: What is the rated nominal speed of the 8MSA4S.E2-73 motor?
A: This model is rated for a nominal speed of 3000 rpm, suitable for applications requiring medium-speed operation.
Q: What type of cooling system does the 8MSA4S.E2-73 motor have?
A: The self-cooling system on the 8MSA4S.E2-73 eliminates the need for external cooling devices.
Q: What encoder technology and resolution does the 8MSA4S.E2-73 motor use?
A: The 8MSA4S.E2-73 is equipped with EnDat inductive encoder technology and provides 32 lines of resolution.
Q: What is the protection rating of the 8MSA4S.E2-73 motor?
A: This motor has an IP65 protection rating, offering substantial resistance to dust and water ingress.
