| 摘要 |
PURPOSE:To obtain a driver circuit which can enhance performance of a motor as high as possible by providing an inference unit which executes fuzzy inference by inputting a frequency of an input pulse and its variation and outputs a phase current command value. CONSTITUTION:A microcomputer 30 calculates a speed of an input pulse based on data of a period of the pulse obtained by a built-in timer counter and stores data in a predetermined address as the speed. A fuzzy inference for comparing a speed of the input pulse calculated this time with a speed calculated at previous time to calculate a change amount of the pulse, then inputting an input pulse speed and a speed change and outputting a phase current command value. However, the correlation among a variation in the frequency of the pulse, noise generated in phase windings of a motor 10 and a level of a counterelectromotive force is previously prepared, optimum torque is generated in any state to enhance performance of the motor as high as possible to reduce influences of the noise, the counterelectromotive force. |
