Patent GB-190607889-A (GB)
Title: Improvements in Dynamo Electric Machines for Rotation at High Speeds
Inventor: TINGLEY EGBERT MOORE
Filed: 1906-04-02
Granted: 1906-08-09
Abstract: 7889. Tingley, E. M. April 10, 1905, [date applied for under Patents Act, 1901]. Armatures; field magnets. - Relates to the construction of rotary laminated core-structures for dynamo-electric machines operated at high speeds. The laminµ are spaced apart to obtain adequate ventilation, and the core - structures are provided with speciallyarranged slots for the reception of exciting and damping windings, which are also of special construction. In the twopole field magnet shown in Fig. 1, the main portion of the core comprises groups 1 of laminµ 4 mounted on the shaft 2 and separated by spacing- rings 3. Each lamina is provided with alternate sets of deep radial slots 5, Fig. 5, for the reception of the exciting-windings, and with shallow slots 6 for the short - circuited damping-windings, with ventilating-apertures 7, and with apartures 8 for bolts 9. The end disks 10, Fig. 3, of each group are provided with bent-up portions 11 and strips 12 which act as additional spacing-pieces, and the openings 13 therein for the bolts 9 are made sufficiently wide to receive the narrowed ends 16 of separating-pieces 15 surrounding the bolts 9, Fig. 1. The end portions of the core are built up of groups 20 of laminµ separated by preferably non-magnetic disks 21, Fig. 4, resting upon rings 22 on the shaft 2. Circumferential slots 45, 46 are provided on the periphery of the rotary member between the groups 20, the outer peripheries of the disks 21 forming the bottoms of the slots. Each group 20 comprises, as shown in Fig. 4, two disks 23 of the form shown in Fig. 7, a ring 24 mounted on the shaft 2, a spacing-disk 25, Fig. 9, formed with projections 30, and a disk 26 similar to the disks 23, the whole being riveted or otherwise secured together. The disks 23, 25, 26 have the middle slot 27 of one of the sets of slots 6 preferably made of the same depth as the slots 5. This deep slot carries the connexions between the coils in adjacent circumferential slots. The bolts 9, Fig. 4, are provided with bushings 32, the smaller ends of which fit in apertures in the disks 25, 26, and the large portions in the disks 21. The core groups are clamped between end plates 34, 35, Fig. 1, the former of which rests against a shouldor 36 on the shaft, and the latter against a collar 37 screwthreaded upon the shaft. The apertures 7 in the laminae produce longitudinal ventilating-passages through the core which communicate with the transverse passages provided by the spacing-pieces. The winding is composed of folded L-shaped pieces 38, Fig. 11, of thin pliable conducting-strips which are placed in the slots one above the other with their ends overlapping until conductors of the desired thickness have been produced, strips of insulating-material being placed between the proper conducting - strips to separate the turns of the conductor. To compensate for the double thickness at the corners, the end portions 39, 40 are caused to overlap, or straight strips 41, Fig. 12, are applied to fill the spaces between the folded portions 'and the ends of the strips. The pressure of the strips upon one another due to centrifugal force effects good electrical connexion between them. In applying the winding to the core, the straight portions of the conductors are placed in the longitudinal slots 5 of the laminµ 4 and the curved portions in the circumferential slots 45, 46 of the end laminµ, connexion being made with the collecting-ring 47 by means of a conductor 48 supported in an insulating block 51 which is located in the apertures 28 in the laminae 23, 25, 26 and disks 21. Connexions between the coils in adjacent circumferential slots are made by mears of doubly-folded conducting strips 52, Fig. 13, the portions 53 between the folds being located in the slots 27 in the core laminµ 23, 25, 26, or in the slots 5 if the deep slots 27 are dispensed with. When the core is fully wound, insulating-material and metal-protecting strips 55 are inserted in the slots, the whole being retained in position by wedges 56 inserted in the grooves 57. The field-magnet polar extremities are surrounded by short-circuited damping-coils 18 of grid shape consisting of longitudinal portions 58 located in the radial slots 6 and connected at their ends by one or more curved segments 59 located in circumferential slots 17. The slots 17 are formed by cutting away the teeth between the slots 6 of some of the outer laminµ 4. The damping-coils are retained in position by means of the wedges 56, additional damping action being provided by the metallic protecting-strips 55.