Product Description:

The PMB33F-20101-01 brushless servomotor belongs to the PMB Brushless Servomotors series and is built by Pacific Scientific. It provides controlled torque and speed for indexing tables, pick-and-place gantries, and other closed-loop axes in industrial automation. Its permanent-magnet design allows rapid, precise response and eliminates brush maintenance. This arrangement is useful where the motor must accelerate and decelerate frequently without the maintenance associated with brushed designs. The compact aluminum housing keeps mass low while promoting heat dissipation so the motor can be mounted directly on moving machine elements.

This model uses a NEMA Size 34 frame, so the 3.4-inch square face and bolt pattern match standard gearboxes. Power and feedback exit through flying leads with AMP connectors, allowing straightforward cabinet wiring. The motor sustains stall torque while drawing up to 11.0 ARMS at 240 VAC. Rotor position is signaled by an integrated Hall sensor; the three sensors are spaced 120 electrical degrees, giving the inverter clean commutation pulses from zero speed. Mechanical coupling relies on a square-key shaft that resists torsional slip and simplifies pulley alignment. Output capability is increased by a stack length multiple of 3, which adds active magnetic length without changing the mounting footprint. With this extended stack, constant torque is maintained across the intended speed range for most medium-inertia loads.

A shaft seal helps keep liquids or dust from reaching the front bearing. The electrical constants and thermal limits are matched to common PMB drives for normal operation on 240 VAC inverter systems. This configuration is suited to mid-range motion axes where standardized mounting, moderate current demand, and compact dimensions are important. It is well suited to packaging, assembly, and transfer equipment that uses repeated start-stop cycles.