Product Description:

The R21HENA-R1-NS-NV-01 is a brushless servo motor manufactured by Pacific Scientific and supplied as part of the R Servomotors series. Designed for tightly controlled motion tasks, the motor couples to precision gearboxes or direct-drive loads and feeds real-time position data back to the drive for closed-loop operation. Its 2-inch round frame and English mounting pattern let machine builders retrofit or upgrade compact pick-and-place heads, indexing tables, and similar automation axes without altering existing hardware.

At stall, the rotor can deliver 0.3 Nm continuously, which indicates the maximum static load the axis can support without overheating. For rapid index moves, the electromagnetic system permits a peak output of 0.88 Nm for short duty cycles, giving extra acceleration when starting or reversing. A winding optimized for minimal flux loss supports a rated mechanical speed of 11000 rpm, allowing high throughput when the motor is coupled directly to small-diameter pulleys or spindles. The round housing measures 2.0 in OD, so the motor fits within tight envelopes found in laboratory automation or vision stages. Rotor inertia is only 0.01 kg·m² × 10⁻³, which reduces servo lag and lets the drive system settle quickly after direction changes.

Torque density is aided by the use of rare-earth samarium cobalt magnets that produce high surface flux while resisting demagnetization under elevated temperatures. The electromagnetic core is assembled with a 1 inch stack length, balancing axial space with thermal dissipation. A dedicated High Speed winding minimizes copper losses at elevated electrical frequencies and works with the drive to keep phase currents within limits when the rotor approaches maximum rpm. Position feedback is provided by a frameless resolver size 15, giving analog sine-cosine signals that withstand electrical noise and allow absolute position computation without a secondary sensor.