| 摘要 |
An electric drive system includes a slip-ring induction motor (1), the stator winding (2) of which is supplied via a machine-commutated static converter (4) from a direct-current source, which may comprise a diode rectifier bridge (6) connected to an alternating-current mains. The rotor is direct-current excited and requisite excitation current when the system is operating under load is supplied to the rotor winding (3), by the fact that thou rotor winding with its slip-rings (11) is connected to the direct-current source (6) in series with the static converter (4). The direct current (I) supplied to the static converter (4) therewith also passes through the rotor winding (3), and provides requisite rotor excitation when the system operates under load. Requisite no load excitation is obtained either by connecting a condenser bank (13) to the stator winding (2) or via a diode rectifier bridge (14) having its direct-current terminals connected across the rotor winding (3) and its alternating-current terminals connected to an alternating-current source (15). |
