Product Description:

The R21GENA-R1-NS-NV-01 is a servo motor produced by Pacific Scientific and assigned to the R Servomotors series. It provides electromechanical power for industrial automation axes by translating commanded current into rotary motion that can be precisely closed-loop controlled by the drive. The model uses a standard housing and a compact cylindrical profile, giving machine builders a space-saving option for light pick-and-place, labeling, or metering stations. Its compact form also suits installations where available mounting space is limited and axis response must remain consistent.

Its continuous stall torque is 0.3 Nm, meaning the motor can supply this sustained level without overheating when the shaft is locked or moving slowly. The diameter of the stator body is 2.0 in OD, so it fits into tight envelopes and matches clamping hardware sized for small round servomotors. Rotor inertia is 0.01 kg·m² × 10⁻³, and the low mass lets the drive accelerate and decelerate quickly with modest control gains. Rated speed reaches 4000 rpm, and at this speed the voltage constant and winding design allow continuous operation within thermal limits. Magnetic flux is generated by rare-earth poles made from samarium cobalt, which offers high energy density and stable characteristics over a wide temperature range.

During transients, the motor can develop a peak output of 0.88 Nm, giving extra headroom for overcoming static friction or brief load spikes. Position and speed are reported to the controller by a frameless transmitter-type resolver in size 15, and no secondary feedback device is installed. Mechanical attachment follows the English mounting convention, which suits equipment built around inch-based patterns. The magnetic stack is 1 inch long, so axial space requirements remain minimal. The unit is delivered without a holding brake, includes no shaft seal, and uses a standard winding for balanced thermal performance under its intended duty cycle.