8MSA4M.R0-V4 B & R Automation
Wake Industrial LLC is not an authorized distributor of this product.
The B & R Automation 8MSA4M.R0-V4 is part of the 8MS Three Phase Synchronous Motors series. This motor uses self-cooling and features a resolver encoder technology, specifically a BRX type resolver with a non-linearity of ±1 angular minute and a precision of ±10 angular minutes. It is classified as a medium relative rated torque motor with a size 4 and length M.
Internal Product Review
The 8MSA4M.R0-V4 is a B & R Automation three-phase synchronous motor with self-cooling and medium rated torque. Resolver feedback gives the unit a controlled, technically refined response that fits demanding motion applications. The BRX resolver and ±1 angular minute non-linearity make accuracy a standout feature.
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Product Description:
The 8MSA4M.R0-V4 is a three-phase synchronous motor from B&R Automation that belongs to the 8MS Three Phase Synchronous Motors series. The unit converts electrical power into controlled mechanical rotation, allowing motion axes in packaging machines, assembly stations, and material-handling equipment to remain synchronized with drive commands. Within a closed-loop servo system, it supplies consistent torque across the speed range, enabling accurate positioning and velocity profiles for repeatable industrial automation tasks. Its synchronous design allows the connected drive to regulate shaft motion in response to changing process requirements.
The motor rejects heat through a self-cooling configuration, meaning the housing surface dissipates losses without an additional blower or liquid circuit. This arrangement simplifies installation and reduces cooling-related maintenance in compact equipment. Rotor position is sensed with a resolver, so the drive receives rotor angle data through signals that tolerate electrical noise and the elevated temperatures often present near power electronics. The frame length M provides a moderate axial dimension that balances continuous torque capability with mass and inertia. The motor size 4 stator diameter establishes the mounting geometry shared by other motors in the size-4 group. The unit has a medium relative rated torque, placing its continuous torque output between the low- and high-torque versions of the same series.
The feedback device has a nonlinearity of ±1 angular minute, so its electrical output deviates from a perfect sine-cosine ratio by no more than that value across one mechanical revolution. Its system precision of ±10 angular minutes indicates the maximum cumulative positioning error when the drive electronics interpret the feedback signal. The installed BRX resolver is compatible with drive parameters intended for this sensor type. Resolver feedback supports position and speed regulation without requiring an optical sensing element, making it suitable for industrial environments where vibration, electrical interference, and temperature changes may affect more sensitive feedback devices. The drive uses the resolver signals to monitor shaft movement continuously and correct deviations from the commanded motion profile.
