| 摘要 |
A computer (28) supplies as output (30) a digital signal representing the cyclic opening RCO relationship tau divided by t of periodic voltage pulses from the windings during successive periods of duration T. The signal is computed from an error signal v provided by a subtractor (26). A power switches (20,22) control circuit (32) processes switch closing signals from RCO value, from sensors (18) giving rotor position, and from synchronizing and frequency signals (34). The computer is designed to modify the start cycle of voltage pulses at the moment of passing from a first operating mode to a second and from a second to the first using a memorized table.. The computer provides a proportional/integral type regulation and the integral term is modified at the moment of passing from one mode to the other. The computer regulates with an integral term int(n) for a sample n of the form int(n) = int(n + 1) + eta n.kj; where k is the coefficient of the integral term and the cyclic start relationship RCO(n) given by: RCO(n) = Kp. eta n + int(n) for, at the moment of 180 degree switching, substitute for the term int(n + 1) another term int(n + 1) which is a function of the speed and of RCO stored in memory (44). |
