| 摘要 |
PURPOSE:To realize stable control even when torque current fluctuates or even in low frequency operational region by performing compensation so that d-axis induced voltage will be zero and employing an angular frequency proportional to q-axis induced voltage as a flux axis. CONSTITUTION:A divider 67 in an angular frequency operating circuit 60 operates an angular frequency omega0 according to a formula omega0=ed/PHI. Since an exciting current id is feedback controlled, the flux amplitude PHI follows up a command value PHI*. The divider 67 operates omega0=ed/PHI based on the command value PHI* of the flux amplitude. In order to operate the angular frequency omega0 accurately according to the formula omega0=ed/PHI, q-axis component of flux PHIq=0 must be satisfied. In order to satisfy the condition by bringing the d=axis component ed of induced voltage to zero, the angular frequency omega0 is compensated by the output of an amplifier 66. |
