Direct drive is an electric machine directly converting electromagnetic energy into linear or rotary movement.
From the engineering viewpoint the direct-drive motor is an electromagnetic system deployed within Cartesian dimensioning and inducing stationary or traveling magnetic field.
Controlling the forces of magnetic interaction between the spatial field of the system’s mobile element and the field of the stationary element enables travel to be effected of the mobile element along any possible path within the first or the second system of coordinates.
The direct drive systems can be subdivided into the linear and rotary motors (platforms). In a classically linear motor the armature fed from an AC source is displaced above a stator consisting of a steel plate and permanent magnets (the so-called magnetic track) through the alternating field of the armature interacting with the static field of the stator.
A linear drive is understood as a device consisting of a transducer of linear bearing motion and a linear AC motor. The direct drive implements a gearless transmission of force and motion to the effector, thus eliminating the need for bushings, shafts or other parts of mechanical gearing.
Elimination of the parts common for ordinary mechanical drive is clearly useful in applications having high dynamics and precision of movement. It can therefore be concluded that direct dcrive is not only the optimal converter of electrical energy into mechanical motion, but also technically the most reliable electrical motor.
Applications of linear drive in various technologies, particularly in machine tools:
- operation within widely adjustable high-response .
electric actuators and in linear feed gears of NC metal-cutting machines;
- Laser cutting installations;
- Electroerrosion operations.
Manufacturing the semiconductor and electronic components:
- Installations for micro wire welding;
- Machine tools for drilling circuit boards;
- Installations for assembling electromechanical units; ;
-Installations for cutting wafers of silicon, glass, and ceramics
Systems for moving objects:
- Sorting machines;
- Conveyor systems.
- High-precision micromanipulators;
- Automatic laboratory equipment;
- Microscopes with coordinate tables.