Product Description:

Pacific Scientific manufactures the R21HSNT-TS-NS-VS-02, a member of the R Servomotors series. The unit serves in industrial automation as a compact rotary actuator that links directly to belt drives, small index tables, or miniature spindles. By translating precision current commands from a digital drive into tightly controlled angular motion, it supports rapid start-stop profiles where cycle time and positional accuracy are critical to throughput.

The electromagnetic core is rated for a continuous stall output of 0.3 Nm, ensuring steady tension or force while the shaft is locked at zero speed. For acceleration bursts, the motor can deliver up to 0.88 Nm without exceeding thermal limits, giving machinery a usable torque reserve of nearly three times the continuous figure. A special winding optimized for high-speed duty allows sustained operation at 11,000 rpm, so linear tooling can maintain high surface speed without gear multiplication. Despite this speed capability, the stator sits inside a 2.0-inch outer diameter cylindrical frame, which lowers mass moment and allows the housing to fit into tight manifold or pick-and-place nests with minimal redesign.

A reflected rotor inertia of only 0.01 kg·m² × 10⁻³ pairs with the flux density of samarium cobalt magnets to sharpen servo response and limit energy stored during reversals. Motion feedback is generated by an integrated Tachsyn resolver that sends velocity and direction data to the amplifier, and no secondary encoder is installed, which reduces connector count. A Viton shaft seal blocks lubricants and fine particulates from the bearing cavity, supporting long service intervals even in coolant mist environments. The assembly ships without a holding brake and uses a 1-inch stack length, choices that further trim weight for axes where external mechanical locks or dynamic motor torque maintain load position when power is removed.