US4164705A — Brushless exciter fault indicator system

Claim 1

Independent Claim 211 words

In a synchronous dynamoelectric machine with brushless excitation, the combination comprising: a main machine rotor member having field coils connected together to form a main rotor field winding, an alternating current exciter having a stator field member and a plurality of salient stator poles thereon, stator field coils disposed on said salient poles and connected together to form a stator exciter field winding, an exciter armature member rotatable with said main rotor field winding and having an armature winding thereon, said exciter armature winding being coupled magnetically with said exciter stator field winding for developing an alternating current excitation signal within said armature winding, rectifier means interconnecting said exciter armature winding and said main rotor field winding to provide direct current excitation to said main rotor field winding, said rectifier means being rotatable with said armature, a sensing coil disposed around a selected one of said salient stator poles of said exciter for developing an alternating electrical signal in response to changes in the magnetic flux wave linking said rotating exciter armature member and the field coil of said selected salient pole, including changes due to faults in said armature winding and in said rectifier means, and means connected to said sensing coil to indicate variations in said alternating electrical signal.

Claim 2

Dependent Claim 211 words

In a synchronous dynamoelectric machine with brushless excitation, the combination comprising: a main machine rotor member having field coils connected together to form a main rotor field winding, an alternating current exciter having a stator field member and a plurality of salient stator poles thereon, stator field coils disposed on said salient poles and connected together to form a stator exciter field winding, an exciter armature member rotatable with said main rotor field winding and having an armature winding thereon, said exciter armature winding being coupled magnetically with said exciter stator field winding for developing an alternating current excitation signal within said armature winding, rectifier means interconnecting said exciter armature winding and said main rotor field winding to provide direct current excitation to said main rotor field winding, said rectifier means being rotatable with said armature, a sensing coil disposed around a selected one of said salient stator poles of said exciter for developing an alternating electrical signal in response to changes in the magnetic flux wave linking said rotating exciter armature member and the field coil of said selected salient pole, including changes due to faults in said armature winding and in said rectifier means, and means connected to said sensing coil to indicate variations in said alternating electrical signal.

Claim 3

Dependent Claim 103 words

A synchronous dynamoelectric machine as defined in claim 1, said exciter armature member including a cylindrical core having winding slots disposed about the circumference of said core, said armature winding including a plurality of coils constituting each phase of said winding, said coils being disposed in said core slots and being angularly displaced with respect to one another, said coils being electrically connected together in parallel within each phase of said armature winding, said rectifier means including a plurality of series connected diode and fuse pairs, at least one series connected diode-fuse pair being connected in series with each said parallel-connected phase coil.

Claim 4

Dependent Claim 201 words

In brushless exciter apparatus, the combination comprising: a shaft, a rotatable armature member disposed on said shaft, said armature having an armature winding electrically connected with a rectifier assembly that is rotatable with said armature, a stator member with a plurality of salient poles that are concentrically disposed about and spaced apart from said armature, a stator field coil disposed on each said salient pole, said stator field coils being connected together to constitute a stator field winding; a sensing coil disposed on a selected one of said salient stator poles for developing an alternating electrical signal in response to changes in the magnetic flux linking said armature winding with the field coil of said selected salient pole, including changes due to faults in said armature winding and in said rectifier assembly, said field coils each encircling one of said poles in a first plane parallel to the axis of said shaft, said sensing coil encircling said selected salient pole in a second plane parallel to said first plane and being located radially inward of the associated field coil relative to the axis of said shaft; and means connected to said sensing coil to indicate variations in said alternating electrical signal.

Claim 5

Dependent Claim 201 words

In brushless exciter apparatus, the combination comprising: a shaft, a rotatable armature member disposed on said shaft, said armature having an armature winding electrically connected with a rectifier assembly that is rotatable with said armature, a stator member with a plurality of salient poles that are concentrically disposed about and spaced apart from said armature, a stator field coil disposed on each said salient pole, said stator field coils being connected together to constitute a stator field winding; a sensing coil disposed on a selected one of said salient stator poles for developing an alternating electrical signal in response to changes in the magnetic flux linking said armature winding with the field coil of said selected salient pole, including changes due to faults in said armature winding and in said rectifier assembly, said field coils each encircling one of said poles in a first plane parallel to the axis of said shaft, said sensing coil encircling said selected salient pole in a second plane parallel to said first plane and being located radially inward of the associated field coil relative to the axis of said shaft; and means connected to said sensing coil to indicate variations in said alternating electrical signal.

Claim 6

Dependent Claim 22 words

The combination defined in claim 3, said indicating means comprising an oscilloscope having its sweep synchronized with the rotation of said armature.

Claim 7

Dependent Claim 36 words

The combination defined in claim 3, including a layer of electrical insulation disposed intermediate of said selected one of said salient field poles and the associated field coil, said sensing coil being disposed within said insulation.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1982-08-13	1983-02-12	1983-08-14	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1986-08-13	1987-02-12	1987-08-14	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1990-08-13	1991-02-12	1991-08-14	$7700.00	Window Closed / Lapsed

Brushless exciter fault indicator system

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