| 摘要 |
Method for high-precision regulation of three-phase machines (8) without a mechanical transmitter, such as a position sensor or tachogenerators, functioning under any operational conditions including low rotational speeds and dwelling, wherein only measurable variables of the intermediate circuit (zk), such as the intermediate circuit current (Izk) or the intermediate circuit voltage (Uzk), are measured. MTo this end, the relation between phase current rises and the induced current are detected by using the actual switching state of the converter, which corresponds to the flow or rotor position of the three-phase machine (8). A converter (1) is supplied by an alternating current power system on its optional alternating current input (2). The D.C. side (3) is connected to the converter (4) having the semiconductor valve (5) by the intermediate circuit (zk). The intermediate circuit current (Ukz) is fed by means of a capacitor (6) and the measuring and control unit (7) is fed by a resistor (R) of the intermediate circuit current (Izk). The actual switching state of the converter (I) is also detected by the measuring and control unit (7). The three-phase machine to be regulated is connected on the bridge circuit of the semiconductor valve (5). The converter (4) is controlled by means of the calculated control signals (9). |
