Product Description:

The R43HENA-R2-NS-VS-02 is a brushless servo motor produced by Pacific Scientific as part of the R Servomotors series. The unit is intended for closed-loop industrial automation axes where precise position, velocity, and torque regulation are required. It has a standard housing and comes without an internal brake, so the drive amplifier or external hardware must provide holding force when the axis is stopped. This arrangement also avoids added brake inertia and keeps the motor suitable for repeatable motion tasks in packaging equipment, pick-and-place gantries, and indexing tables.

Under continuous load, the motor can deliver 3.9 Nm of stall torque, which is the sustained twisting force available for static or low-speed duty cycles. Acceleration headroom is provided by a peak capability of 10.4 Nm, allowing the axis to overcome inertial or frictional surges during brief demand spikes. Rotor inertia is rated at 0.22 kg·m² × 10⁻³, and this low inertia supports fast reversals while helping the servo loop respond quickly to command changes. A high-density winding with rapid electrical time constants supports a rated speed of 3700 rpm, and the design uses a high-speed winding set. Primary feedback comes from a frameless size-21 resolver, so the drive receives position data during rapid transients. That feedback method is also well suited to industrial environments where stable signal tracking is important during repeated starts, stops, and speed changes.

A 4.25-inch square frame conforms to common English mounting patterns, which helps the motor fit machine plates and brackets built around inch-based layouts. The stack length of 3 inches keeps the magnetic path short and helps maintain responsive torque production without adding unnecessary bulk. Rare-earth magnets made of samarium cobalt increase flux density and support a high torque-to-inertia ratio without increasing rotor size. To limit lubricant migration toward the resolver cavity, the output shaft uses a Viton shaft seal, which helps keep contaminants away from internal components during cyclic operation.