Product Description:

The PMB31D-00100-03 brushless servomotor belongs to the PMB Brushless Servomotors series manufactured by Pacific Scientific. Intended for tightly controlled motion in industrial automation, it converts three-phase drive power into accurate rotary displacement for indexing, tension control, and coordinated multi-axis positioning tasks. When paired with a compatible drive controller, the unit supplies repeatable torque and rapid response without the maintenance associated with brushed designs. Electronic commutation supports smooth operation across changing load conditions, which is useful for equipment that must start, stop, and reverse frequently. This operating style suits production machinery that needs stable speed and position through long duty cycles.

The motor uses a NEMA Size 34 frame, which provides a 3.4-inch square face and a standardized pilot for mounting to gearheads or machinery plates. The stator has a nominal stall current of 5.4 ARMS, which helps size the matching power stage and thermal protection. Rotor position is reported by a resolver, allowing continuous feedback even under electrical noise or vibration. That feedback method remains useful in industrial settings where robust signal transmission is important during rapid motion changes. Cable management is simplified by flying leads with AMP connectors, which reduce extra termination work during installation. A front-end shaft seal helps block oil splash, dust, and cutting fluids from moving along the shaft toward the bearings.

The motor also includes a PTC thermistor in the winding package so the drive can respond to excessive temperature before heat buildup affects normal operation. Torque is transferred through a shaft with a flat, which gives set screws a positive seating surface during coupling. With a stack length multiple of 1, this version uses the shortest magnetic stack and keeps the overall motor length compact for confined equipment spaces. This shorter body can be useful where guards, slides, or adjacent components limit available axial room. Compatibility with supplies up to 240 VAC allows use on common servo power systems while keeping insulation demands within standard limits. The combination of thermal monitoring, compact packaging, and direct feedback supports precise motion control in enclosed machine layouts.