| 摘要 |
PROBLEM TO BE SOLVED: To obtain the controller of an AC motor, which can control special, such as reduced field control, constant power factor control, maximum efficiency control, maximum torque control, etc. SOLUTION: Voltage vectors indicating ons/offs of the switching devices of a PWM inverter 3 are stored in a switching table 7. A voltage vector to be selected is determined in the switching table according to a torque deviation ΔT and a flux deviation Δϕ. A flux command value ϕr, which is to be compared with a detection flux |ϕ1|, is determined by an optimum primary flux determining means 13. The flux command value ϕr is updated. |
