8MSA5L.E1-B400-1 B & R Automation
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The 8MSA5L.E1-B400-1 is a three phase synchronous motor produced by B & R Automation as part of the 8MS Three Phase Synchronous Motors series. It features self-cooling, a smooth shaft end, a rated nominal speed of 3000 rpm, and has a large relative rated torque. The motor uses a multi-turn EnDat encoder with 512 lines of resolution and can recognize up to 4096 revolutions.
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Product Description:
B & R Automation manufactures the 8MSA5L.E1-B400-1, a three-phase synchronous motor in the 8MS series. Intended for integration with AC servo drives, the unit converts electrical power into precise mechanical rotation for CNC axes, pick-and-place gantries, and packaging lines. Its synchronous design keeps the rotor aligned with the rotating stator field, which supports repeatable motion under changing load conditions. That makes it suitable for coordinated axes that need predictable speed and position response during rapid starts, stops, and reversals.
B & R Automation lists the nominal speed at 3000 rpm, which suits many standard servo applications without requiring added reduction stages. Thermal energy is removed through a self-cooling method that relies on surface convection instead of external blowers. Power and feedback connectors exit on the B-side, which supports orderly cable routing when the size 5 frame is mounted from the flange. The motor uses length code L, giving it a longer active stack within the standard 8MS housing envelope. Relative rated torque is listed as large, indicating greater stall capability than smaller variants in the same family. The output uses a smooth shaft, so torque must be transmitted through a clamp-style or press-fit coupling. The motor is supplied without a holding brake and without an oil seal, so any static holding or fluid protection must be provided elsewhere in the machine.
The integrated feedback package is built around an optical disk that outputs 512 lines per revolution and remains accurate within ±60 arcseconds of mechanical angle error. EnDat communication carries the position data over a serial pair, and the system can track up to 4096 revolutions for absolute position recovery after power loss. The encoder chain has a frequency limit of 100 kHz at -3 dB, which supports responsive servo loops at higher operating speeds. Multi-turn counting reduces the need for homing after restart, and the lack of a holding brake lets the axis coast freely when power is removed.
Frequently Asked Questions about 8MSA5L.E1-B400-1:
Q: What type and precision of encoder does the 8MSA5L.E1-B400-1 motor use?
A: This model features a multi-turn EnDat encoder with a precision of ±60".
Q: What is the rated speed of the 8MSA5L.E1-B400-1 synchronous motor?
A: The motor has a nominal rated speed of 3000 rpm for consistent operation.
Q: Does the 8MSA5L.E1-B400-1 motor come with a holding brake?
A: A holding brake is not equipped on the 8MSA5L.E1-B400-1 motor.
Q: What type of shaft end is provided on the 8MSA5L.E1-B400-1 motor?
A: The shaft end of this motor is smooth, with no keyway or threads.
Q: What cooling mechanism does the 8MSA5L.E1-B400-1 motor utilize?
A: Self-cooling is used for maintaining temperature in the 8MSA5L.E1-B400-1.
