| 摘要 |
PROBLEM TO BE SOLVED: To enable a vector control system for PM motor to make magnetic flux calculation to a high frequency without compromising the accuracy or shortening digitizing time at the time of estimating the field magnetic flux of a PM motor, by means of the same-dimension magnetic flux observer which is approximately transformed to a digitizing system. SOLUTION: The magnetic flux observer has a constitution that is approximately transformed to the digitizing system which calculates the operation expression of a continuous system at every sampling period. Of the field magnetic flux, the field magnetic flux vector is approximated by approximating the component which is rotated at an angular speed ω by performing rotational coordinate transformation on the composite value of a component which increases or decreases the amplitude of the field magnetic flux and the preceding calculated result of the field magnetic flux by a rotational phase angle Δθwhich is found by multiplying digitizing time ΔT by the angular speed ω and the component which interferes with the stator side from the rotator side by means of the difference between the vectors before and after the rotational coordinate transformation. |
