8Msa5s.R0-V401 B & R Automation
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The B & R Automation 8Msa5s.R0-V401 is a three phase synchronous motor from the 8MS series with a rated power of 2.45 kW and a rated speed of 4500 min-1. The motor features a resolver encoder with BRX technology and has a peak torque of 19.8 Nm and a rated torque of 5.2 Nm. It weighs 7.5 kg without brake and has a thermal time constant of 45 minutes.
Internal Product Review
The 8Msa5s.R0-V401 is a B & R Automation three-phase synchronous motor with 2.45 kW rated power and 5.2 Nm rated torque. Resolver feedback with ±1 angular minute non-linearity supports accurate commutation and stable servo response. Strong dynamic headroom from 19.8 Nm peak torque makes the motor an excellent fit for demanding motion applications.
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Product Description:
The 8Msa5s.R0-V401 is a three-phase synchronous motor produced by B & R Automation for the 8MS Three Phase Synchronous Motors series. In automated production cells, this motor couples to an ACOPOS inverter and converts drive current into rotary motion that positions tooling, feeds material, or indexes conveyors. Its compact size-5 housing and resolver feedback allow precise torque generation without an internal brake, making it suitable for dynamic axes that rely on external holding mechanisms.
The machine delivers a continuous output of 2.45 kW. At the rated operating point, the shaft turns at 4500 rpm and produces 5.2 Nm of torque, while the inverter must supply 5.2 A per phase. Short overloads are supported by a peak torque of 19.8 Nm that draws up to 32 A. The electromagnetic circuit provides a stall torque of 6.6 Nm, and the motor has a torque constant of 1.03 Nm per ampere. A back EMF of 62 V is generated for every 1000 rpm, so the required drive voltage margin rises linearly with speed. The rotor has an inertia of 4 kg cm², balancing fast acceleration with mechanical stability, and the complete motor weighs 7.5 kg. Its frame-5 stator geometry provides a compact form for high-cycle positioning tasks.
The motor has an electrical time constant of 6.73 ms, based on a stator inductance of 13.8 mH and a winding resistance of 2.05 Ω. This relationship governs current rise and affects the torque response to step commands. Thermal behavior is represented by a 45-minute thermal time constant, allowing intermittent overloads while helping the motor remain within its insulation temperature limits. Position feedback comes from a BRX resolver, whose nonlinearity remains within ±1 angular minute. Its overall precision remains within ±10 angular minutes, providing the controller with accurate absolute angle data during high-speed reversals. The resolver signal also supports stable commutation and closed-loop position regulation across the motor’s operating range.
