| 摘要 |
A system for producing properly timed gate signals and gate-cathode power for the silicon controlled rectifiers of a cycloconverter network, through which the phase windings of a three-phase alternating current motor are cyclically energized from an alternating current supply potential alternator, having two groups of three silicon controlled rectifiers for each motor phase winding. The properly timed gate signals are produced by a rotor position sensor including six circumferentially arranged phototransistors, each of which corresponds to a group of cycloconverter silicon controlled rectifiers, an axially aligned and spaced light-emitting diode corresponding to each phototransistor, a shutter disposed therebetween and rotated by the motor rotor of a configuration such that pairs of phototransistors are alternately exposed to and masked from the corresponding light-emitting diodes and three gate signal light-emitting diodes connected in series with each phototransistor across a direct current potential source. When any pair of phototransistors is exposed to the corresponding light-emitting diodes, a circuit is completed for the three gate signal light-emitting diodes in series with each. Each gate signal light-emitting diode produces a gate signal for a respective silicon controlled rectifier of the group to which the phototransistor with which it is connected in series corresponds. The gate-cathode circuit of each cycloconverter silicon controlled rectifier of each group is transformer coupled to a different phase output winding of a gate power three-phase alternating current alternator, mechanically coupled to and operated by the alternating current supply potential alternator, which produces a gate-cathode power potential which leads the alternating current supply potential alternator potential by a selected electrical angle. Included in each cycloconverter silicon controlled rectifier gate-cathode circuit are a light actuated silicon controlled rectifier, optically coupled to a corresponding gate signal light-emitting diode, and a gate-cathode circuit silicon controlled rectifier which are triggered conductive, respectively, by the light emitted by the corresponding gate signal light-emitting diode and the output signal of a zero crossover switch in the same gate-cathode circuit to complete the gate-cathode circuit for the corresponding cycloconverter silicon controlled rectifier.
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