When mechanical designers use conventional servo motors to drive ballscrews or rollerscrews for linear motion, they quickly encounter limits to the speed and precision they can attain.
The basic ballscrew design has many moving parts; bearings, balls, raceways in the nut device, a ground or machined screw surface with critical tolerances, and devices to connect the rotary motor to the shaft of the ballscrew. Even beyond the imprecision due to sheer mechanical complexity, attempting to operate above the ballscrew’s speed limitations leads to “whip” that causes system resonance and potential failure.
Direct drive linear motors provide substantially higher positioning accuracy, repeatability and speed due to their direct action and relative absence of moving parts.
In this Session, you will learn:
- The physics that limit the speed and precision of rotary-to-linear motion devices
- How direct drive linear servo technology allows you to radically improve machine performance
- Considerations for sizing and selecting direct drive linear servo motors in your application
