Product Description:

The R43HENA-R2-NS-NV-0 is a brushless servo motor manufactured by Pacific Scientific and supplied within the R Servomotors series. It operates as the electromechanical actuator in closed-loop positioning systems, converting commanded current from a drive amplifier into precise shaft motion for packaging, pick-and-place, or indexing equipment. By pairing rare-earth magnets with internal position feedback, the unit provides consistent torque production and accurate motion control for industrial automation tasks that require repeatable performance over long duty cycles. Its brushless design also reduces routine wear because there are no brushes to replace during normal operation.

Its continuous stall capacity is 3.9 Nm, allowing the shaft to hold load at zero speed without overheating when the motor is used within its operating limits. A rated speed of 3700 rpm supports fast point-to-point motion, and the motor uses a High Speed winding to suit applications that need higher operating velocity. The motor has a 4.25-inch square frame and a Standard housing style, so it fits English-pattern bolt circles without adapters. Because no factory holding brake is installed, static load retention must come from drive torque or an external clamp. The mounting interface follows the English convention, and the design omits a shaft seal to reduce drag at elevated rotational speeds.

The rotor’s moment of inertia is only 0.22 × 10⁻³ kg·m², which helps the axis accelerate quickly with modest current rise. Short-term overloads are supported by a peak torque of 10.4 Nm, giving additional force during acceleration, rapid reversals, and brief indexing demands. Magnetic flux is supplied by rare-earth (samarium cobalt) magnets, and position feedback comes from a frameless size 21 resolver rather than a secondary transducer. A 3-inch stack length keeps the motor compact while still providing useful thermal mass for repeated motion cycles, and the shorter magnetic stack helps limit overall weight on moving axes.