Meaning
High precision motion platforms utilize electromagnetic force to drive the position of an inspection head or a laser tool. The linear motor gantry provides faster acceleration and higher accuracy than traditional belt or screw driven systems. This configuration is standard in high speed optical inspection and semiconductor packaging equipment.
Motion Control
Direct drive technology eliminates the backlash and friction associated with mechanical couplings. A linear motor gantry relies on a feedback loop from high resolution encoders to maintain sub micron positioning. The controller adjusts the current to the coils to achieve smooth and rapid movement across the workspace.
Thermal Management
Heat generated by the coils can cause the support structure to expand and distort. A linear motor gantry often incorporates liquid cooling channels to stabilize the temperature of the magnets and the rails. Keeping the system cool is essential for maintaining the calibration of the optics over a long production shift.
Accuracy Specification
Positioning repeatability is measured under specific load and speed conditions to define the system capability. The linear motor gantry is evaluated for its ability to return to the same coordinate within a few nanometers. This performance level allows for the assembly of extremely small electronic components and high density interconnects.
Environmental factors such as floor vibration and air temperature are also controlled to ensure the certificate of accuracy remains valid.
