Product Description:

Pacific Scientific manufactures the PMA55R-00100-00 as a brushless servo motor within the PMA Brushless Motors series. The unit belongs to the PMA Brushless Servomotors family and is intended to drive precision axes in automated machinery where rapid acceleration and stable velocity control are required. By combining electronic commutation with integrated feedback, it supplies closed-loop motion while eliminating brush wear, making it suitable for continuous-duty positioning tasks on conveyors, packaging equipment, and material-handling gantries. It is also well suited to motion systems that require repeatable starts, stops, and speed changes over long operating cycles.

The motor has a continuous stall torque of 17.0 Nm, allowing it to hold loads without additional gearing or overheating under steady-state conditions. For rapid indexing, it can deliver a peak torque of 51.5 Nm, giving short bursts of three times the continuous rating. The rotor’s reflected inertia is 3.06 kgm² × 10⁻³, a moderate value that supports fast torque transients while minimizing overshoot in servo loops. The winding has a nominal stall current of 11.0 ARMS, and its voltage class is 240-480 V AC, enabling connection to mid- or high-bus PWM drives without rewinding.

The square frame measures 142 mm on each side and uses stack length code 5 to balance torque density against overall size. The housing has a mass of 15.0 kg, which adds thermal capacity and slows temperature rise during heavy cycles. Feedback is supplied by a resolver, providing position signals in harsh electromagnetic environments. Power enters through a right-angle 6PP, or 6-pin, connector, and the signal lines share that orientation for compact cable routing. The output end uses a smooth shaft, and the motor is delivered without a brake, so external holding devices are needed when power is removed.