R46GSNA-R2-NS-NV-02 Pacific Scientific
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The Pacific Scientific R46GSNA-R2-NS-NV-02 is a servo motor from the R Servomotors series with a frame size of 4.25 inches and a stack length of 6 inches. It provides a continuous stall torque of 7.6 Nm and peak torque of 20.2 Nm, with rare earth samarium cobalt magnets. The motor features a frameless resolver for primary feedback and does not include a holding brake or shaft seal.
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Product Description:
The R46GSNA-R2-NS-NV-02 is a brushless servo motor manufactured by Pacific Scientific and listed in the R Servomotors series. The unit is intended for closed-loop industrial automation tasks that require consistent speed and position control, such as coordinated pick-and-place arms or web-tension stations. It interfaces with a matched drive to translate electrical commands into controlled torque, supporting repeatable motion cycles on production lines. Electronic commutation eliminates the mechanical wear associated with brushes and allows the drive to regulate motor current in response to changing loads.
The motor delivers a continuous stall torque of 7.6 Nm, allowing it to hold a stationary load without overheating when adequate cooling is provided. During rapid acceleration or short overloads, the electromagnetic design supports a peak output of 20.2 Nm, giving machinery the torque needed to overcome inertia during startup. The rotor inertia is 0.40 kg·m² × 10⁻³, so the motor can change speed quickly while damping small disturbances. The 4-inch-class frame has a 4.25-inch-square housing, allowing the motor to fit common NEMA-style mounting patterns. Torque density is improved through the use of rare-earth samarium-cobalt magnets, which maintain high magnetic flux at elevated winding temperatures. The housing style and winding type use the standard configuration for this model.
The control loop uses a size 21 frameless resolver that returns absolute rotor position to the drive without optical components. This feedback method provides resistance to dust and oil while supporting accurate commutation and closed-loop motion control. The motor has an axial stack length of 6 inches, which helps it fit within compact machine assemblies and gearbox arrangements. Because the design includes no brake, an external holding device is required when a load must remain stationary after power is removed. The motor also has no shaft seal, so additional protection is necessary in installations exposed to liquids or contaminants. There is no secondary feedback device, leaving the resolver as the sole position sensor for the drive.
