US3214617A

US3214617A - Dynamo-electric machines

Info

Publication number: US3214617A
Application number: US235230A
Authority: US
Inventors: Tudge Joseph
Original assignee: Associated Electrical Industries Ltd
Current assignee: Associated Electrical Industries Ltd
Priority date: 1961-12-01
Filing date: 1962-11-05
Publication date: 1965-10-26
Anticipated expiration: 1982-10-26
Also published as: GB960924A

Description

Oct. 26, 1965 J. TUDGE DYNAMO-ELECTRIC MACHINES Filed Nov. 5, 1962 2 Sheets-Sheet 1 Oct. 26, 1965 J. TUDGE 3,214,617

DYNAMO-ELECTRIC MACHINES Filed Nov. 5, 1962 2 Sheets-Sheet 2 United States Patent 3,214,617 DYNAMO-ELECTRIC MACHINES Joseph Tudge, Walkden, Manchester, England, assignor to Associated Electrical Industries Limited, London, England, a British company Filed Nov. 5, 1962, Ser. No. 235,230 Claims priority, application Great Britain, Dec. 1, 1961, 43,058/ 61 4 Claims. (Cl. 310-54) This invention relates to dynamo-electric machines,

and more particularly to the rotors of turbo-attenuators. U.S. Patent No. 3,046,424 is directed to a method of admitting coolant into a rotor winding. This method According to the present invention the rotor of a dynamo-electric machine comprises a core having slots therein, a winding including conductors located in the slots, there being a plurality of conductors and a feed conductor in each slot, end connections connecting said conductors and feed conductors electrically in series to form coils, said conductors and feed conductors being formed with longitudinal passages, the conductors in each slot being arranged in two stacks and transposed so that each in turn occupies the lowermost position in the slot, insulating liquid connectors between each feed con ductor passage and the said lowermost part of each conductor passage in the same slot and means for passing cooling liquid through all the conductors and feed conductors, of conductors having longitudinal passages for coolant, said plurality of conductors being divided into a first group of conductors which are so transposed that each in turn has a portion which is radially inside the other conductors in that group, and a second group of conductors lying radially inside the first group, electrically insulating connectors adapted to pass coolant between the longitudinal passages of said portions of the conductors in the first group and the longitudinal passages of the conductors in the second group.

In a preferred embodiment the second group of conductors comprises one conductor and each such conductor in the winding is connected either to a coolant supply duct extending axially in the rotor shaft, or to a coolant discharge duct extending axially in the rotor shaft.

The transposition of the rotor conductors may be in the manner employed in so-called Roebel Bars, i.e. the conductors are arranged in the slot in two stacks side by side, the conductors in one stack sloping downwards to a radially innermost position, then bend sideways to form a portion radially inside the other conductors in the bar, and then slope upwards. Thus each of the conductors in turn occupies the radially innermost position in the slot, but at different locations along the slot.

In order that the invention maybe more clearly understood reference Will now be made to the accompanying drawings in which:

FIG. 1 is a perspectived rawing of the conductors of a coil side according to the present invention.

FIGS. 2A, 2B, 2C are sections taken on planes AA, BB, and CC respectively of FIG. 1.

FIG. 3 is a diagrammatic view of six coil sides showing the coolant flow.

In FIG. 1 water is supplied by any suitable means, but preferably by the method disclosed in U.S. Patent No.

3,214,617 Patented Oct. 26, 19 65 2 3,046,424 into the feed inlet conductor 1. From this conductor the water flows through the electrically insulating connectors 2, into the longitudinal passages 3 of the conductors 4. In these longitudinal passages the water flows to the other coil side where it is discharged through electrically insulating connectors into a discharge feed conductor. From this discharge conductor the water is discharged to waste by any suitable means. It will be noted that the conductors 4 are transposed so that each in turn becomes radially innermost. This brings each in turn in close proximity with the inlet conductor 1, which is radially inside all the conductors 4. The connectors 2 lie in oblique grooves 8 milled in the inlet conductor 1.

FIGS. 2A, 2B and 20 show more clearly the arrangement of the electrically insulating connectors. The electrically insulating portion 2 is joined to the inlet conductor 1 by a metal tube 3. This enables a leakproof joint to be made. Irregularities at the top and bottom of the coil-side are smoothed off by the

packers

5, 6 and 7. Packer 7 has been omitted from FIG. 1 to avoid confusion.

FIG. 3 which is an explanatory winding diagram shows three coils associated with one pole, and for simplicity each coil side has only seven conductors, six of which are transposed and one of which is an inlet or discharge feed conductor. The connectors from the inlet conductors to the radially innermost portions of transposed conductors are indicated by letters A to R.

The connectors between the discharge conductors and the radially innermost portions of the transposed conductors are indicated by the pairs of letter ab, be etc. By tracing through the circuit it will be noticed that each inlet connector feeds two paths each terminating at a different discharge connector, and each discharge connector is supplied by two paths each originating at a different inlet connector.

It will be noticed from FIG. 3 that the middle coil has oppositely handed cross-overs. The reason for this will be appreciated after tracing out the water circuit for the smallest coil when it will be noticed that the discharge connector gh would be supplied from L instead of from G if the handing were the same throughout. The supply from L however would pass from an inlet to an outlet without having passed through the Roebel Bar at all. This is undesirable and hence each alternate coil is handed oppositely.

What I claim is:

1. In a turbo alternator machine, a rotor comprising a core having slots therein, a winding including conductors located in said slots in said core, there being a plurality of conductors and a feed conductor in each said slot, end connections connecting said conductors and feed conductors electrically in series to form coils, all said conductors and feed conductors comprising longitudinal passages, insulating liquid connectors between each feed conductor passage and each conductor passage in the same slot, and means for passing cooling liquid through all the conductors and feed conductors.

2. In a turbo alternator machine, a rotor comprising a core having slots therein, a winding including conductors located in said slots in said core, there being a plurality of conductors and a feed conductor in each said slot, end connections connecting said conductors and feed conductors electrically in series to form coils, said conductors and feed conductors comprising longitudinal passages, the conductors in each said slot positioned in two stacks and transposed so that each in turn occupies the lowermost position in the slot, insulating liquid connectors between each feed conductor passage and the said lowermost part of each conductor passage in the same slot, and means for passing cooling liquid through all the conductors and feed conductors.

3. In a turbo alternator machine, a rotor comprising a core having slots therein, a winding including conductors located in said slots in said "core, there being a plurality of conductors and a feed conductor in each said slot, end connections jconnecting said conductors and feed conductors electrically in series to form coils, said conductors and inlet conductors comprising longitudinal passages, insulating liquid connectors between each feed con: duct or passage and each conductor passage in the same slot, means for supplying cooling liquid to the feed conductors associated with the conductors forming one side of each coil, and means for discharging cooling liquid from the opposite side of each coil.

v 4. In a turbo alternator machine, a rotor comprising a core having slots therein, a Winding including conductors located in said slots in said core, there being a plurality 0f. conductors and a feed conductor in each slot, end connections connecting said conductors and feed conductors electrically in series to. form cores, said conductors and feed conductors comprising longitudinal passages,

the conductors in each slot positioned in two stacks and transposed so that each in turn occupies the lowermost 4 References Cited by the Examiner UNITED STATES PATENTS 7/62 Tudge 3l061 7/63 Fechheimer .a 31054 MILTON O. HIRSHFIELD, Primary Examiner. DAVID X. SLINEY, Examiner.

Claims

1. IN A TURBO ALTERNATOR MACHINE, A ROTOR COMPRISING A CORE HAVING SLOTS THEREIN, A WINDING INCLUDING CONDUCTORS LOCATED IN SAID SLOTS IN SAID CORE, THERE BEING A PLURALITY OF CONDUCTORS AND A FEED CONDUCTOR IN EACH SAID SLOT, END CONNECTIONS CONNECTING SAID CONDUCTORS AND FEED CONDUCTORS ELECTRICALLY IN SERIES TO FORM COILS, ALL SAID CONDUCTORS AND FEED CONDUCTORS COMPRISING LONGITUDINAL PASSAGES, INSULTATING LIQUID CONNECTORS BETWEEN EACH FEED CONDUCTOR PASSAGE AND EACH CONDUCTOR PASSAGE IN THE SAME SLOT, AND MEANS FOR PASSING COOLING LIQUID THROUGH ALL THE CONDUCTORS AND FEED CONDUCTORS.