Product Description:

The PMA57S-11100-00 is a rotary servomotor built by Pacific Scientific and supplied under the PMA Brushless Motors series. As a brushless unit intended for closed-loop motion platforms, it converts drive commands into controlled angular displacement and torque for positioning tables, pick-and-place heads, or packaging axes in industrial automation lines. Resolver feedback supplies analog position data to the drive so rotor position can be tracked during closed-loop operation. This operating role suits repeatable starts, stops, and direction changes on automated axes.

At the mechanical level, the motor develops a continuous stall torque of 22.0 Nm, allowing it to hold position without overheating when energized but stationary. For rapid indexing moves, it can reach a peak torque of 69.0 Nm, supplying short bursts of acceleration before thermal limits intervene. These torque levels are generated at a winding nominal stall current of 22.0 ARMS, which guides drive sizing and cable selection. The rotor’s reflected mass moment, measured at 4.21 × 10⁻³ kg·m², affects how quickly the axis can reverse direction. The winding is designed for a 240–480 V AC bus, so the motor can be paired with common three-phase servo amplifiers. It uses the standard configuration for this motor family.

The unit ships with a 24 V brake that clamps the shaft during power loss for vertical or load-holding duties. Power enters through a right-angle arrangement of the 6PP connector, which helps reduce rear clearance requirements and supports compact cable routing. The 142 mm body square and seven-stack lamination package provide the volume needed for the magnetic circuit, while total mass is held to 19.0 kg for easier handling during installation. A closed keyway shaft with the key fitted simplifies alignment with mating components and supports direct connection to keyed couplings or hubs.