Product Description:

The PMA42M-00100-00 is a brushless servo motor produced by Pacific Scientific and belongs to the PMA Brushless Motors series. As a permanent-magnet rotary actuator, it converts drive current into controlled torque and speed for positioning tasks in CNC stages, pick-and-place heads, and other closed-loop automation axes. Integration is simplified because the motor houses a resolver for feedback and a smooth output shaft that couples directly to precision gearheads or load elements.

During continuous operation, the motor can hold a torque of 4.1 Nm without overheating. This is the maximum static load it can sustain at stall while staying within the allowed insulation temperature rise. For dynamic moves, its electromagnetic system delivers up to 14.6 Nm peak, giving sufficient reserve for acceleration and impact loads. The rotor inertia is kept to 0.36 kg·m² × 10⁻³, so velocity transients occur quickly and servo tuning remains responsive. At the electrical interface, the windings draw a nominal stall current of 2.7 ARMS, a value used by drive amplifiers to size current loops and protective circuitry. These windings are intended for a 240–480 V AC class, enabling direct connection to mid-voltage bus drives common in multi-axis machinery.

The square flange measures 115 mm on a side, allowing direct mounting to standard NEMA 42 frames while preserving alignment with linear guides. Despite this footprint, the motor weighs only 6.2 kg, which helps reduce the load on moving axes where mass can affect cycle time. Cabling exits through a right-angle housing, and power is carried on a 6PP six-pin connector, both of which help route conductors inside tight machine envelopes. The unit is built without a mechanical brake, incorporates a resolver sensor, uses a stack length of 2, and has a smooth shaft for couplings that rely on compression clamps.