Product Description:

The PMB31B-10214-00 brushless servomotor is produced by Pacific Scientific as part of the PMB Brushless Servomotors series. It delivers closed-loop torque and velocity for indexing tables, pick-and-place axes, and other repetitive motion stages used in industrial automation cells. By combining a permanent-magnet rotor with electronic commutation, the motor provides precise positioning while eliminating brush wear. Its three-phase design interfaces directly with modern servo drives and supports smooth acceleration, reversal, and settling during repetitive motion. That brushless arrangement also reduces routine wear points, which helps maintain consistent response over long cycle counts in automated equipment.

The mechanical outline follows the NEMA Size 34 frame, giving a 3.4-inch square mounting face that aligns with standard gearheads and brackets. When the shaft is locked, the winding draws a maximum of 2.7 A RMS of stall current at 240 VAC, so the connected drive must be sized for that thermal demand. Position feedback is generated by a 2048 ppr incremental encoder, yielding 8192 quadrature counts per revolution after x4 decoding. That feedback density helps the drive correct small position errors during low-speed moves and short indexing sequences. A built-in digital encoder with commutation track lets the controller perform sensor-based startup without separate Hall devices. Connection to field wiring is handled through flying leads with MS connectors, which allows direct connection to matching cable assemblies and keeps integration straightforward in compact machine layouts.

A round shaft supports clamp or collet couplings without keyseat stress concentrations, which suits light-inertia loads and applications that need precise concentricity. The motor is supplied as a standard motor, meaning it does not include application-specific modifications that would alter its basic configuration. Its lamination pack uses a stack length multiple of 1, which keeps the active length compact while supporting a moderate torque constant for mobile gantry axes and other space-limited mechanisms. This shaft style also works well with common coupling hardware used on similarly sized servo axes. The overall form fits installations that need repeatable servo response without extra mechanical adaptation.