| 摘要 |
Power supply control system for an asynchronous motor fed from AC mains via a speed controller (10); the speed controller including a rectifier bridge (11) linked to the mains, an intermediate DC circuit (12) (Vbus) equipped with a capacitor (16), an inverter (13) equipped with switches controlled by a control circuit (20), and linked to the phase windings of the motor, characterised in that it comprises a structure (24) with regulations in cascade equipped with a frequency regulator (25), with a current limiter (27) and with a current regulator (26) driving the control circuit (20); the frequency regulator being linked to the input of a ramp generator supplying the starting speed of the motor, and to the output of the current limiter (27), the latter being linked, on the output side, to the current limiter (26). The structure (24) with regulations in cascade is associated with the intermediate circuit in order to limit the DC voltage (Vbus) of the capacitor (16) by virtue of the current limiter. <IMAGE> |
