Product Description:

The PMX1120-A10-BN0-00 is a two-phase stepper motor built by Kollmorgen within the PMX Stepper Motors series. Designed for open-loop positioning, it converts electrical pulse trains into fixed mechanical increments so motion controllers can index loads or maintain static holding torque without feedback devices. The compact construction targets laboratory pipetting systems, miniature XYZ stages, and low-flow pumps where space is restricted and repeatable angular resolution is needed. This operating style suits applications that favor simple control architecture and predictable step response over closed-loop servo regulation.

Electrical connectivity is provided through a four-lead bipolar configuration, enabling standard H-bridge drives to energize the phases in either polarity and reverse magnetic flux as required. The stator uses a bipolar winding, which helps the motor produce higher torque from the same frame size than common unipolar arrangements. Dimensional compliance follows the NEMA 11 mounting pattern, so the motor face can bolt directly into instruments that rely on 0.86-inch square flange geometry. Each electrical pulse advances the rotor by 1.8°, giving 200 full steps per revolution for fine angular resolution. Output capability is enhanced by a laminated iron rotor with a 2-stack length, which increases the active magnetic surface and raises detent and dynamic torque without increasing frame width.

The mechanical interface uses a smooth shaft option, allowing press-fit pulleys or clamping couplings without key slots that can concentrate stress. The motor has no rear shaft, which shortens the overall length and leaves more clearance at the back of the assembly. For clean, low-humidity enclosures, the unit is supplied without a shaft seal, which eliminates seal drag and reduces frictional heat. This layout is well suited to a front-drive configuration where power is taken only from the output end and no back-mounted accessory is required.