Method and device for controlling currents of synchronous motor

Details Method and device for controlling currents of synchronous motor Method and device for controlling currents of synchronous motor

2005-02-01

2005-02-01

Ip, Paul (Department: 2837)

Electricity: motive power systems

Induction motor systems

C318S700000, C318S702000, C318S804000

Reexamination Certificate

active

06850030

ABSTRACT:
There are performed converting electric currents Iu, Iv, and Iw flowing through the synchronous motor into a d-axis actual current Idfb and a q-axis actual current Iqfb on rotational coordinate axes which rotate synchronously with a rotor magnetic flux vector, on the basis of an actual position θ of the rotor of the synchronous motor; estimating a d-axis simulated current Idob and a q-axis simulated current Iqob on the basis of the d-axis actual current Idfb, the q-axis actual current Iqfb, a d-axis actual voltage command Vdref, and a q-axis actual voltage command Vqref; generating a d-axis actual voltage command Vdref and a q-axis actual voltage command Vqref on the basis of a d-axis current command Idref, a q-axis current command Iqref, a d-axis simulated current Idob, and a q-axis simulated current Iqob; and converting the d-axis actual voltage command Vdref and the q-axis actual voltage command Vqref into actual voltage commands Vuref, Vvref, and Vwref on the basis of the actual position θ of a rotor of the synchronous motor. As a result, there can be provided a method and apparatus for controlling an electric current of a synchronous motor, which can provide a superior current response characteristic regardless of the influence of temperature.

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