| Abstract |
Cycloconverters and current-source-inverters both have proved performance for drives in the MW-range. They operate best in combination with a synchronous motor. The cycloconverter drive has very low torque ripple from zero start-up until a relatively small frequency, while the current-source-inverter causes high torque ripple disturbing only at low frequencies and it's maximum frequency is much higher than that of the cycloconverter . This paper describes the synthesis of both systems. The same circuit operates as a cycloconverter at start-up and low speeds of the motor, corresponding to low frequencies, and as a current-source-inverter at high speeds. Special attention is paid to the switch over between the two different modes of operation. First experiments show successfull switch over from one operating mode to the other. |
