Product Description:

The PMB21D-30114-00 is a brushless servomotor produced by Pacific Scientific as part of the PMB Brushless Servomotors series. This NEMA-frame unit functions as an electromechanical actuator that delivers controlled torque and velocity when commanded by a servo drive. By providing rapid acceleration and repeatable positioning, it supports packaging, electronics assembly, and other mid-power automation axes. Its brushless architecture minimizes maintenance compared with brushed designs, making it suitable for continuous duty in production lines.

Mechanical registration starts with the frame designation of NEMA Size 23, which uses a 2.25-inch square mounting face common to compact machinery. Wiring is handled through flying leads with AMP connectors, allowing quick plug-in to panel harnesses without a dedicated terminal block. Feedback is generated by a digital encoder with commutation, so the drive receives both rotor position data and commutation signals without external sensors. The incremental track inside the encoder resolves to 2048 ppr, which is suitable for fine positioning when paired with interpolation in modern controllers. Under worst-case stall conditions at 240 VAC, the motor draws 5.4 A RMS, which is useful when selecting a drive with adequate continuous current capacity.

Coupling is simplified by a 0.25-inch round shaft that accepts setscrew or clamp-style hubs without keyways. The lamination stack uses a length multiplier of 1, which indicates the shortest active core offered in the series and helps keep rotor inertia low for fast accelerations. It is supplied as a standard motor, so no custom windings or special seals change its thermal or dimensional profile. This combination suits compact axes that need responsive starts and stops in a limited installation space. The motor remains part of the Pacific Scientific PMB product line and uses the mechanical footprint associated with this family.