Global Microturbine - Global Energy LLC


Publication Title | United States Patent 191 Hoffman eta1. QUADRATUREAXISFIELDBRUSHLESS EXCITER

Microturbine Search Engine Series

Capstone Turbine Publications search was updated real-time via Filemaker on:

Capstone Turbine Publications | Return to Search List

Search Completed | Title | United States Patent 191 Hoffman eta1. QUADRATUREAXISFIELDBRUSHLESS EXCITER
Original File Name Searched: US4093869.pdf | Google It | Yahoo | Bing



Page Number: 001
Previous Page View | Next Page View

Text | United States Patent 191 Hoffman eta1. QUADRATUREAXISFIELDBRUSHLESS EXCITER | 001



United States Patent [191 Hoffman eta1.

[54] QUADRATUREAXISFIELDBRUSHLESS EXCITER

[75] Inventors: ArthurH.Hoffmann,Monroeville; DaleI.Gorden,NorthVersailles;Lee

A.Kilgore,Export,alofPa.

[73] Assignee: WestinghouseElectricCorp., Pittsburgh,Pa.

[21] Appl.No.: 676,449

[22] Filed: Apr.13,1976

[51] Int.Cl.2..F02N 11/04

[52] US.Cl...290/31;290/46; 290/39;290/49;290/52

[58] FieldofSearch..290/10,22,31,32,

[1] 4,093,869 [45] June6,1978

generator,whichismechanicallycoupledtoagastur bineprimemover,isstartedsynchronouslytobringthe gas turbine up to a speed which exceeds its stall speed under load. The rotor ?eld winding of the synchronous dynamoelectric machine is connected to receive direct current excitation from a rotatable recti?er assembly of a brushless exciter. During starting, a quadrature axis winding disposed around the stator of the brushless exciterisenergizedbysinglephasealternatingcurrent. Alternating current excitation is induced by trans former action within the rotor armature winding of the exciter and is applied to the rotor ?eld winding after beingrecti?edbytherotatablerecti?erassembly.The transformer action operates independently of the rota tion of the rotor member of the synchronous dynamo electric machine so that the brushless exciter develops direct current ?eld excitation for starting purposes when therotorisatrest.Polyphasealternatingcurrent excitationisappliedtothesynchronousdynamoelectric machinestatorwindingtoestablishadynamicmagnetic ?eld which rotates at a speed proportional to the fre quency of the applied excitation. Interaction of the staticmagnetic?eldoftherotorandtherotatingstator ?eld produces the mechanical turning force. The fre quencyofthesynchronouslyappliedstatorexcitationis increased from substantially zero cycles per second to a higher frequency until the rotor member has acceler ated synchronously to the desired speed of rotation.

290/39,46,49.4,52 ReferencesCited

U.S.PATENT DOCUMENTS

3,591,844

3,764,815 10/1973 Habocketa1................290/52 3,908,130 9/1975 Lafuze .............. ...... 290/31 3,908,161 9/1975 Messenger ..290/38

Primary Examiner--Robert K. Schaefer AssistantExaminer-Michael K. Mutter Attorney,Agent,orFirm-G. H.Telfer

[57] ABSTRACT

Method and apparatus for accelerating a large inertia load from rest to a predetermined speed of rotation by means of a synchronous dynamoelectric machine. A synchronousdynamoelectricmachine,suchasaturbine

[56]

7/1971 Schonebeck et a1. .. 290/52

7s

SUPPLEMENTAL I AC POWER

SOURCE

'

AC EXCITER FIELD IQUADRATURE~AXIs

L2.

AC-WINDING) Ir————————-_____

|Paws???“ ARMATURE

FIELD |

I |

3s

T-G FIELD 2° WINDING

Ié= SW5? ~26 [8}

| I____________1

40]

' ' REGULATOR

CONVERTERl5

' 1‘

Io—fI w WINDING ’ '4

p62 I

AC EXCITER FIELD IDIRECT-AXIS

oc-wINoINsI -

Q 2

TURBINE

[80

- CYCLO

g A ._I_

GEINEGATOR s OR

10Claims,4Drawing?gures

Image | United States Patent 191 Hoffman eta1. QUADRATUREAXISFIELDBRUSHLESS EXCITER



united-states-patent-191-hoffman-eta1--quadratureaxisfieldbrushless-exciter
Capstone Turbine For Sale - Microturbine C30 C65 C200 C600 C800 C1000 - Go to microturbine website

Search Engine Contact: greg@globalmicroturbine.com