Product Description:

The R43HCNA-R2-NS-NV-00 is a servo motor built by Pacific Scientific within the R Servomotors series. It converts electrical power into controlled rotary motion for positioning and speed regulation tasks in automated machinery, CNC stages, and similar industrial axes. When paired with a compatible drive, it supports precise closed-loop motion on equipment that requires accurate response during starting, stopping, and speed changes.

Its continuous stall torque is 3.9 Nm, allowing the shaft to hold load at zero speed without overheating. The rotor inertia of 0.22 kg·m² × 10⁻³ supports fast acceleration while helping the control loop remain stable during command changes. Torque is produced by rare earth (samarium cobalt) magnets, which retain flux at high temperature and resist demagnetization. The motor uses a NEMA Face mounting interface, so it fits common gearheads or machine plates. A rated speed of 3700 rpm supports high-speed axis operation and can be paired with ballscrews without requiring large ratio reduction. The housing uses the standard style, and the 3-inch stack length provides the thermal capacity associated with this frame. Because the unit is supplied without a holding brake, stopping energy must be managed by the drive or by an external brake. The shaft end has no seal, so the installation area must remain free from coolant spray or oil.

For dynamic events, the motor can reach 10.4 Nm of peak torque for brief intervals, which helps with static friction breakaway and rapid index moves. Position feedback comes from a frameless resolver, transmitter type, size 21, and this analog device tolerates shock better than optical encoders. The enclosure footprint is a 4.25" square, making it compatible with other motors in the same size class. The windings use a High Speed design, which lowers inductance so current rises quickly when command changes occur. No secondary feedback device is present, so cabling remains simpler while the resolver handles closed-loop position feedback.