Product Description:

The R21HENA-R1-NS-VS-01 is a servo motor produced by Pacific Scientific within the R Servomotors series. Designed for closed-loop motion axes in packaging lines, pick-and-place heads, and small gantries, the unit converts commanded current into rotational motion with tight speed and position control. In industrial automation systems, it mates with a compatible drive controller to position loads quickly and repeatably, favoring compact installations where high rotational speed is required.

Its winding is optimized for high-speed operation, enabling a rated velocity of 11,000 rpm while maintaining thermal limits. Under continuous stall conditions, the shaft can hold 0.3 Nm, which is the maximum steady load the motor can support without motion. For rapid index moves, the electromagnetic design supports a peak output of 0.88 Nm for short bursts during acceleration or deceleration. A rotor inertia of 0.01×10⁻³ kg·m² allows quick reversals because less torque is required to change speed. The 1-inch stack length keeps the magnetic path short, reducing copper loss at high-frequency excitation. An English mounting interface simplifies alignment to inch-based gearheads or brackets, and the standard housing dissipates heat by convection. Position feedback is provided through a frameless size-15 resolver, and there is no secondary feedback channel.

Mechanical construction uses a round frame with a 2.0-inch outer diameter, which fits easily into tight spaces while maintaining concentric rotor balance. Torque density is increased by rare-earth samarium cobalt magnets that retain high flux even at elevated temperatures. Environmental protection is provided by a Viton shaft seal, which helps keep lubricant in and particulate out during high-speed rotation. Because the motor is supplied with no holding brake, any static load must be restrained by the drive or an external clamp. Omitting the brake removes residual drag and allows faster coast-down after power removal.