Product Description:

The R46HSNA-TS-MN-VS-02 is a brushless servo motor manufactured by Pacific Scientific as part of the R Servomotors series. Designed for closed-loop control in automated assembly lines, packaging stations, and material-handling axes, it converts drive current into precise rotary motion for positioning and speed regulation. An internal rare-earth samarium cobalt magnet set and a high-speed winding give the motor strong torque density while keeping the 4-inch-class frame compact enough for crowded machinery. The motor is suited to applications that require repeatable starts, stops, and speed changes under closed-loop control.

The frame measures 4.25" square, so the motor fits standard NEMA-class mounting plates, and its stack length is 6 inches, which sets the overall installation depth. The rotor can maintain a continuous stall torque of 7.6 Nm, which allows it to hold load at zero speed without overheating during normal continuous duty. For rapid indexing, the electromagnetic circuit produces up to 20.2 Nm of peak torque, giving additional acceleration capacity during short-duration demands. A reflected rotor inertia of 0.40 kg·m² × 10⁻³ helps the axis respond quickly while still maintaining stable motion under changing load conditions. This balance helps the servo amplifier maintain smooth correction during acceleration and deceleration.

The housing follows Pacific Scientific’s standard style and uses a smooth cylindrical body that helps simplify mounting and external cleaning. Because the unit is supplied with no brake, static holding during power loss must be provided by an external clamp or by drive-produced holding torque where appropriate. Speed feedback is provided by a Tachsyn resolver-tachometer, which supplies an analog signal compatible with many legacy and modern drive systems. A Viton shaft seal protects the output bearings from dust and coolant entry, which helps preserve lubrication at the shaft interface during operation. The seal material is also well suited to environments where oils or cleaning fluids may contact the shaft area.