| 摘要 |
PROBLEM TO BE SOLVED: To obtain good response by correcting an input amount based on deviation between an output of a digital PI current compensating device and an output of voltage limiter, and a control constant of the digital PI current compensating device. SOLUTION: When an input is eid(k) and an output is Vd' (k) and a condition amount of integrator is xid(k) at a certain sampling time in a digital PI current compensating device 21, a current deviation input eid(k) is equal to the value before correction of energizing current ids* (k) in a current corrector 24. Here, when a limit value of a voltage limiter 23 is ± Vdmax, correction amount Δeid(k) which results in Vds(k)=Vdmax is obtained for the current deviation input eid (k) in order to avoid generation of wind-up phenomenon by saturated manipulation amount. The condition amount xid' (k+1) which results in Vds' (k)=Vdmax is calculated again using the corrected current command idscmd(k) and it is then used at the time of the next sampling time. Accordingly, good response characteristic can be attained. |
