Abstract
This paper proposes a new algorithm for V-F transformation and it is applied to a numerical controller. Unlike the existing models which operate with a fixed frequency, the frequency of pulse series produced by the numerical controller can be freely changed according to real-time velocity requirements by adopting the proposed method. Moreover, acceleration of the controller can also be controlled within the range of the motor system. Therefore, wind-up of the system caused by exceeding acceleration can be avoided. Structure and parameters of the numerical controller are thoroughly described in this paper, and method of adjusting the parameters of the controller to adapt to the servo system's torque - frequency characteristic is also introduced. At last, effectiveness of velocity and acceleration control using the proposed V-F transformation method is demonstrated by simulation results.
