Product Description:

The PMA21B-00100-00 brushless servomotor is produced by Pacific Scientific as part of the PMA Brushless Motors series. With a smooth shaft and resolver feedback, it delivers closed-loop motion for pick-and-place gantries, small index tables, and other automated axes that require repeatable positioning. The unit ships without a holding brake, which suits drives that maintain position electrically or through external mechanical restraint. It belongs to stack length 1 within the product range, giving it a compact overall length and reduced weight for installations where space and inertia must be minimized.

The motor develops a continuous stall torque of 0.63 Nm, supplying stable low-speed force whenever the load demands holding or slow indexing under maximum current. For short moves or acceleration bursts, it can reach 2.3 Nm, allowing the axis to overcome inertia spikes before settling into steady operation. That torque is produced with a nominal stall current of 2.7 ARMS, so the drive must accommodate this current to avoid saturation. The windings are rated for a maximum of 240 V AC, matching common single-phase or three-phase servo inverters in moderate-power cells. All of this performance is packaged in a 70 mm square frame that integrates easily into standardized mounting patterns.

Dynamic behavior is influenced by a rotor inertia of 0.022 × 10⁻³ kg·m², enabling rapid velocity changes without excessive drive effort. The motor itself weighs 1.7 kg, which adds only a small amount of mass to cantilevered or mobile stages. Cabling exits through a right-angle connector orientation that keeps the harness flush with the machine frame, and power is delivered through a 6PP 6-pin plug that mates directly with Pacific Scientific drive leads. The servomotor uses a standard configuration for general-purpose motion axes within the PMA range, and it remains suited to compact motion systems that benefit from low inertia and straightforward cable routing.