Precise Control of Step Motor Speed

According to the demand of economical NC machine tool to high accuracy and practicability, three methods for speed control of step motor: ideal curve implementation, left-end curve implementation and right-end curve implementation were discussed. The computer complexity of these methods was compared too. It is proved that the method of left-end curve implementation for speed control of step motor is more simple and practical. Based on this method, the accurate control pulses are generated from the PC timer and used for driving the step motor to realize a wide range speed control smoothly. This new approach can be used in an economical machine tool and a good effect is obtained.