Product Description:

The PMB31B-10200-02 servomotor is produced by Pacific Scientific and belongs to the PMB Brushless Servomotors series. As a brushless AC motor, it is intended for positioning and velocity loops in automated machinery, where compact size and maintenance-free operation support continuous use. Brushless construction eliminates brush wear, which helps maintain consistent performance during repeated duty cycles. It is well suited to machines that cycle often and need repeatable motion without the upkeep associated with brushed motors. When paired with an electronic drive, the motor converts electrical power into controlled rotary motion for linear actuators, indexing tables, and packaging axes that require accurate speed and position control.

The motor has a NEMA Size 34 frame, which matches standard 3.4-inch mounting patterns used on many motion stages. During locked-rotor testing at 240 VAC, the windings draw a nominal stall current of 2.7 ARMS. Rotor position feedback is provided by a resolver, which supplies analog angle signals that remain stable in electrically noisy environments. Field wiring exits as flying leads with MS connectors, allowing sealed cable routing before connection to the control cabinet. Torque is transferred through a round shaft, which suits couplings that do not require a keyed interface. These features make the motor practical for compact servo axes that need reliable feedback and straightforward cable routing.

Thermal protection is provided by a PTC thermistor bonded to the stator windings, so the drive can react if winding temperature rises too far. This sensor lets the control system respond before excessive heat can shorten insulation life during sustained low-speed, high-torque operation. The 1 stack length multiple indicates a single lamination stack, which helps keep rotor inertia low for quick acceleration and deceleration. The compact magnetic stack also helps control overall motor mass in applications that benefit from fast direction changes. That layout is useful on motion axes where responsive speed changes matter more than high rotating inertia.