Hardware interpolator which consists of the DDA integrators can generate high speed by external clock and small position error. However, it has low efficiency when it generatrs small distance.
In this thesis, the method which can be improved efficiency linear and circular interpolation is presented. The hardware interpolator is designed and manufactured based on this method and software algorithm to be driven the interpolator by computer is developed. Because the interpolator emits a sequence of pulses, it is interfaced to the step motor which drives the milling machine to test performance.
To compose a DC motor control system, the position controller using the feedforward compensator is designed and it is interfaced to the drive unit which contains an internal control loop consisting of the power amplifier, dc motor, and the tachometer. Performance is tested by the X-Y recorder which is drived by analog input voltage.
