Product Description:

The PMB33E-20116-03 is a brushless servomotor produced by Pacific Scientific in the PMB Brushless Servomotors series. It converts electrical energy into controlled rotary motion for positioning axes, indexing tables, and other automation tasks that require repeatable speed and torque. By using a permanent-magnet rotor with electronic commutation, the motor provides quick response and avoids the brush wear associated with conventional brushed designs. That operating style makes it suitable for packaging, semiconductor, and material-handling equipment where steady motion control is required over many cycles.

Its mechanical envelope follows the NEMA Size 34 mounting pattern, so it fits standard 3.4-inch square flanges without requiring adapter plates. Under locked-rotor conditions at 240 VAC, the winding draws 7.4 ARMS, which helps determine drive capacity and conductor sizing. High-resolution feedback is provided by an optical encoder with 4096 ppr quadrature output, and the integrated digital encoder with commutation also supplies the commutation tracks needed by the drive. Factory-terminated flying leads with AMP connectors extend from the stator, allowing straightforward electrical connection while helping preserve signal quality in electrically noisy machinery.

The output shaft uses a square key so torque can be transferred to pulleys or couplings without slip during normal operation. The motor can also be ordered with a shaft seal and PTC thermistor, which help limit contaminant entry and provide temperature-sensitive protection for the drive system. Torque density is increased by a stack length multiple of 3, meaning the core uses three lamination segments to increase magnetic volume without changing the frame footprint. This arrangement supports higher torque from the same mounting size while keeping the motor compatible with standard mechanical layouts.