| 摘要 |
<p>The present invention relates to a method of controlling power to an electric machine (10) and a controller device for performing such method. At least one semiconductor switch (41) is provided per phase (31, 32, 33) of a machine AC power (30), the semiconductor switches (40) supplying the machine AC power to the electric machine. The method comprises the steps of supplying an incoming AC power (20) comprising an incoming voltage (24) and an incoming current, to the semiconductor switches, measuring a voltage and current in the machine AC power (30) supplied by the semiconductor switches to the electric machine (10), estimating a present flux vector (51, 52) based on the measured voltage and current to the electric machine, calculating a reference flux vector (71) based on the estimated present flux vector (51, 52) and a desired operating state (61) of the electric machine, and defining time instants (101) for changing the state of the semiconductor switches (40) based on the reference flux vector (71) and the incoming voltage (24). The time instants (101) correspond to a behavior of the semiconductor switches such that a new measured voltage with a resulting current to the electric machine is predicted to achieve a new estimated flux vector corresponding to the reference flux vector.</p> |
