Rolls-royce Corporation

Jeffrey Hobday

Stephen Mark Husband

Graham P Bruce

David F Brookes

Electrical systems for connecting rotary electric machines with gas turbine spools are provided. One such electrical system includes: a first rotary electric machine; a second rotary electric machine; a first set of bidirectional converter circuits; a second set of bidirectional converter circuits; and DC outputs for connection with an R-channel network. Each electrical machine is mechanically coupled with a respective gas turbine spool and has an identical even number N&#x2265;4 of phases, each phase having a respective index and including an identical number P&#x2265;1 of coils wound in a P-plex configuration in which adjacent phases are radially separated by 2&#x3c0;/NP mechanical radians. Each of the first and second converter circuits converts AC to and from DC, has a respective index n, and is connected with the P coils in the nth phase of the first and second rotary electric machines, respectively.

Electrical systems

Fault-tolerant electric drive systems including a machine having a rotor and a stator having coils arranged in pairs. Each coil in each pair separated by 180 degrees, a first phase (&#x3d5;A) having one of the coil pairs and a phase drive circuit connected therewith, a second phase (&#x3d5;B) having a second one of the coil pairs and a second phase drive circuit connected therewith, a third phase (&#x3d5;C) having a third one of the coil pairs and a third phase drive circuit connected therewith, and a fourth phase having a fourth one of the coil pairs and a fourth phase drive circuit connected therewith. Further included is a controller connected with the first, second, third and fourth phase drive circuits to control operation thereof.

Electric drive systems

Fault-tolerant four-phase electric drive systems are provided. One such system comprises: a rotary electric machine having a permanent magnet rotor and an alternate-wound stator having eight evenly-spaced coils arranged in pairs, each coil in each pair being separated by 180 degrees; a first phase (&#x3a6;A) comprising a first one of the coil pairs and a first phase drive circuit connected therewith; a second phase (&#x3a6;B) separated by +45 degrees from the first phase and comprising a second one of the coil pairs and a second phase drive circuit connected therewith; a third phase (&#x3a6;C) separated by +90 degrees from the first phase and comprising a third one of the coil pairs and a third phase drive circuit connected therewith; a fourth phase (&#x3a6;D) separated by +135 degrees from the first phase and comprising a fourth one of the coil pairs and a fourth phase drive circuit connected therewith; and a controller connected with the first, second, third and fourth phase drive circuits to control operation thereof.

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Derby, United Kingdom

Jeffrey Hobday