Examples of servo system design

• Servo positioner using laser interferometer feedback for controlling multi-axis stages for testing hard disk components.
• Compact servoamplifier for microscope fine-focus drive accepts bipolar analog input and produces micro-stepper output.
• Single-axis air-bearing stage with 6-foot travel driven by 3-phase brushless DC linear motor commutated via laser interferometer feedback using PMAC DSP motion controller.
• Servomotor controller for a 3-phase air-bearing spindle (spins hard disk stacks up to 25,000 rpm with less than 2 ppm velocity jitter).
• Motion controllers implemented with a combination DSPs and FPGAs using firmware written in a combination of assembly, C, C++ and Anagram (Parser Generator).
• Failsafe dynamic brake for high-mass rotating system driven by 3 phase brushless motor. Constant current sink is powered by rectified back EMF and provides constant torque braking.
• Four axis servo system with laser interferometer position feedback and DC servomotors for a photoresist ablation tool using an excimer laser.