| 摘要 |
1414378 Starting prime movers and subsequently generating BORG-WARNER CORP 24 Jan 1973 [2 Feb 1972] 3664/73 Heading H2H A system for supplying electrical energy comprises an induction machine 10 having a mechanical input shaft 11 and output conductors 13-15 for supplying an A.C. output voltage, a circuit 20 adapted to operate as an inverter during start-up when the induction machine acts as a motor to rotate the input shaft and as a switching system when the induction machine acts as a generator, and an oscillator-and-logic circuit 27 which supplies signals for controlling the switching frequency of switches in the circuit to regulate the frequency or amplitude of the A.C. output of the induction machine. The circuit 20 comprises a thristor inverter which is initially connected to a D.C. source (17), Fig. 7 (not shown), the A.C. output of the inverter supplying excitation to the machine 10 operating as a motor to rotate the shaft 11. The shaft rotates a prime mover (not shown) such as an electric motor, petrol engine or turbine which then drives the induction machine as an A.C. generator. The switching of the thyristors in the circuit 20 is controlled by a knob 28 to regulate the output of the system despite variations in the speed of the shaft 11. During this time, the circuit 20 acts as a switching system to control the periods for which a capacitor 62 is connected to each of the phase lines 13-15. Alternatively, a system is described, Fig. 9 (not shown), in which the switching of the thyristors is automatically controlled by the circuit 20 to regulate the output. The circuit 20 may comprise transistors. |
