| 摘要 |
The invention relates to a method and structure for operating a 3-phase machine fed by a 3-phase inverter, using a stator flux controller (123) and a slip frequency controller (113), or using a stator flux controller and a torque controller, wherein: a target value ( ?*sl ) fed to the slip frequency controller (113) or the torque controller is limited to a maximum slip frequency value ( ?*sl i max, at the output of 112) or a maximum torque value in order to limit the torque-driving fundamental mode current component of the stator current, that is, the current through the stator of the machine (N); the rate at which the target value (?*s) fed to the stator flux controller (123) changes is limited to a maximum value (??S,max, at the output of 119) in order to limit the flux-driving fundamental mode component of the stator current; the maximum slip frequency value (?*sl_i_max ) or maximum torque value is calculated as a function of a prescribed maximum current value (IS,max) for a fundamental mode stator current level of the stator current, and as a function of a filtered actual value (| iSd |f ) of the flux-driving fundamental mode current components (iSd) of the stator current (iS). |
