R911273044 (MDD090C-N-030-N2L-130GA2)

At standstill, that torque ensures the motor can resist external loads (e.g. holding a load without drifting) without slipping, enabling precise positioning. It also determines sizing of mechanical components (gears, belts) to avoid overspecification or underperformance.

The holding brake allows the motor shaft to be locked mechanically when de-energized, preventing unintended motion—which is crucial for safety during power loss or maintenance. It adds extra weight and cost, and requires reliable actuation circuitry (often 24 V DC to release) and periodic check-ups to ensure proper holding force.

The centering diameter is critical for mounting interfaces and coupling alignment. A standard 130 mm diameter helps ensure compatibility with machine flanges, reducing need for custom adapters—but misalignment tolerance diminishes as diameter increases, so precision in the housing assembly becomes more important.

Standard balancing (often class R or N per DIN) ensures vibration is within acceptable limits for typical speeds. For very high-speed or precision applications (spindles, optics, aerospace), higher balance classes reduce centrifugal vibration and extend bearing life.

A plain shaft provides backlash-free torque transmission when using clamping couplings or shrink sleeves, which improves positional accuracy and repeatability. However, it may require more expensive coupling hardware, and in high radial loads a keyway version might offer better form-fit for resisting torque pulses or shear.