Product Description:

The PMB31D-10101-01 is a brushless servomotor produced by Pacific Scientific as part of the PMB Brushless Servomotors series. Designed for closed-loop positioning and speed regulation, the unit converts electrical energy into rotary motion with high dynamic response. It is chosen for pick-and-place modules, indexing tables, and other automation equipment that must repeat moves accurately under varying load. The brushless design supports consistent servo performance without the brush wear found in mechanically commutated motors.

With a continuous stall torque of 2.1 Nm, the motor can hold loads at zero speed without thermal overload. Producing that torque requires a nominal stall current of 5.4 A RMS from a 240 VAC drive, and this value must match the amplifier rating. The electromagnetic circuit is fed from a DC bus that can reach 320 V DC, giving voltage margin for fast acceleration. Because the stator has a line-to-line inductance of 5.2 mH, current ripple is reduced and control loops stay stable. The frame meets NEMA Size 34, so the bolt pattern fits common gearheads in the same class. A round shaft eases coupling, and the stack length multiple of 1 indicates the shortest rotor stack in this model group.

For high-speed positioning tasks, the rotor can spin to 8400 rpm under no load, while the overall body length is only 134.1 mm, supporting compact machine layouts. Position feedback is obtained from a built-in Hall sensor, allowing six-step commutation in cost-sensitive servo axes. Installation is simplified by flying leads terminated with AMP connectors, so no additional junction boxes are needed. A factory-installed shaft seal resists coolant splash along the production line, and the smooth shaft has a diameter of 12.695 mm for use with standard clamp or set-screw couplings without keys. The cable exit and sealed shaft area help the motor fit enclosed stations where space around the drive end is limited.