Hey there! When I'm picking servo motors for high-acceleration applications, I've learned the hard way that some specs get overlooked but can really make or break performance. Here are the most commonly missed ones that can cause premature failure or bottlenecks:

First up is bearing life under acceleration loads. Most people check static bearing ratings, but high acceleration creates dynamic forces that dramatically reduce bearing lifespan. The constant start-stop cycles in acceleration applications put tremendous stress on bearings that standard ratings don't account for.

Thermal capacity during acceleration bursts is another big one. Servo motors can handle peak torque for short periods, but repeated acceleration cycles generate significant heat buildup. If the motor's thermal time constant isn't adequate, you'll get thermal shutdowns or permanent magnet demagnetization over time.

Rotor inertia matching gets overlooked too. While everyone checks the torque-to-inertia ratio, they often miss how the motor's own rotor inertia affects system response. A heavy rotor might have great torque, but it can't accelerate itself quickly, creating a performance bottleneck.

Torque ripple and cogging torque are sneaky problems in high-acceleration applications. At low speeds during acceleration, these torque variations can cause vibration and positioning errors that standard specs don't reveal. Smooth motion requires minimal torque ripple, especially when you're trying to accelerate precisely.

Finally, cable and connector specifications for high-acceleration environments are often an afterthought. The constant flexing and vibration in acceleration applications can destroy standard cables, leading to intermittent connections and system failures.

These are the specs I always double-check now to avoid those frustrating performance issues down the road!