US 8,427,092 B2Granted

High voltage DC electric power generating system with permanent magnet generator protection

AssigneeHamilton Sundstrand Corporation

InventorsGregory I. Rozman, Steven J. Moss

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Abstract

A permanent magnet generator system provides protection from fault conditions. The system includes a permanent magnet generator having a first, second, and third winding wherein each winding has a first end and a second end. During the normal mode of operation, the first ends of the windings are shorted to a first neutral point and alternating current (AC) voltage developed in the first, second and third windings is provided to a primary output associated with the second ends of the windings. In response to a fault condition on the primary output side of the system, the second ends of the windings are shorted together to a second neutral point and the first ends of the windings are disconnected from the first neutral point. During the backup mode, AC voltage developed in the windings is provided to a secondary output associated with the first ends of the windings.

Claims20

Dependent claims

An electric power generation system comprising:

a permanent magnet generator (PMG) having at least one permanent magnet and a first winding, a second winding, and a third winding for developing and alternating current (AC) voltage in response to a magnetic field provided by the at least one permanent magnet, the first winding, the second winding and the third winding each have a first end and a second end;
a primary output connected to the second end of the first, second and third windings to receive the AC voltage developed in the first, second, and third windings of the PMG during a normal mode of operation;
a secondary output connected to the first end of the first, second and third windings to receive the AC voltage developed in the first, second, and third windings of the PMG during a backup mode of operation;
a first pair of contactors including a first contactor connected between the first end of the first winding and the first end of the second winding, and a second contactor connected between the first end of the second winding and the first end of the third winding;
a second pair of contactors including a third contactor connected between the second end of the first winding and the second end of the second winding, and a fourth contactor connected between the second end of the second winding and the second end of the third winding;
a controller for selectively operating the PMG system in either a normal mode or operation or a backup mode of operation, wherein during the normal mode of operation the controller closes the first pair of contactors to connect the first ends of the first, second and third windings to a first neutral point, and opens the second pair of contactors to supply the AC voltage developed in the first, second and third windings to the primary output;
and
wherein during the backup mode of operation the controller closes the second pair of contactors to connect the second ends of the first, second and third windings to a second neutral point, and opens the first pair of contactors to supply the AC voltage developed in the first, second and third windings to the secondary output.

5 more elements

A method of operating a permanent magnet generator system that includes a permanent magnet generator having a first, second and third winding, each winding having a first and second end, the method comprising:

operating in a normal mode of operation in which a first pair of contactors is closed to connect the first ends of the first, second and third windings to a first neutral point, wherein alternating current (AC) voltage developed on the first, second and third windings is provided via the second ends of the first, second and third windings to a primary output;
and
operating in a backup mode of operation in response to a detected fault condition in which a second pair of contactors is closed to connect the second ends of the first, second and third windings to a second neutral point and the first pair of contactors is opened, wherein voltage developed on the first, second and third windings is provided via the first ends of the first, second and third windings to a secondary output.

A high-voltage direct-current (DC) electric power generating system comprising:

a permanent magnet generator (PMG) having at least one permanent magnet and a first winding, a second winding, and a third winding for developing and alternating current (AC) voltage in response to a magnetic field provided by the at least one permanent magnet, the first winding, the second winding and the third winding each have a first end and a second end;
a primary converter connected to the second end of the first, second and third windings that converts the AC voltage developed in the first, second and third windings to a direct-current (DC) voltage during a normal mode of operation;
a secondary converter connectable to the first end of the first, second and third windings that converts the AC voltage developed in the first, second and third windings to a DC output voltage provided during a backup mode of operation;
a first pair of contactors including a first contactor connected between the first end of the first winding and the first end of the second winding, and a second contactor connected between the first end of the second winding and the first end of the third winding;
a second pair of contactors including a third contactor connected between the second end of the first winding and the second end of the second winding, and a fourth contactor connected between the second end of the second winding and the second end of the third winding;
a third pair of contactors including a fifth and sixth contactor connected between the DC output voltage of the secondary converter and a load;
a fourth pair of contactors including a seventh and eight contactor connected between the DC output of the primary converter and a load;
a controller for selectively operating the system in either a normal mode or operation or a backup mode of operation, wherein during the normal mode of operation, the controller closes the first and fourth pair of contactors and opens the second and third pair of contactors such that AC voltage developed on the first, second and third windings is provided to the primary converter and the DC output voltage of the primary converter is provided to the load;
and
wherein during a backup mode of operation, the controller opens the first and fourth pair of contactors and closes the second and third pair of contactors such that AC voltage developed on the first, second and third windings is provided to the secondary converter and the DC output voltage of the secondary converter is provided to the load.

7 more elements

Dependencies are inferred from the claim text.

Facts

Application: 12/906,824Filed 18 Oct 2010
Published: US 2012/0091939 A119 Apr 2012
Granted: 23 Apr 2013
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

H02K 3/28
Windings characterised by the conductor shape, form or construction, e.g. with bar conductors: layout of windings or of connections between windings
H02K 11/33
Structural association with control circuits or drive circuits: drive circuits, e.g. power electronics
H02P 29/032
Providing protection against overload without automatic interruption of supply: preventing damage to the motor, e.g. setting individual current…
H02K 2213/06
Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00: machines characterised by the presence of fail…