US838605A

US838605A - Dynamo-electric machine.

Info

Publication number: US838605A
Application number: US30813006A
Authority: US
Inventors: Bernard A Behrend
Original assignee: Allis Chalmers Corp
Current assignee: Allis Chalmers Corp
Priority date: 1906-03-26
Filing date: 1906-03-26
Publication date: 1906-12-18
Anticipated expiration: 1923-12-18

Description

PATENTED DEG.18. 1906."

B.A. BEHRBND. DYNAMO ELECTRIC MACHINE.

AP?LIOATIOH 1ILED MAB. 26,1906.

.TNVE'NTURI \A/imsssss:

THE uomus ms-rsas cm, wasnmoran. u. c.

' UNITED sTA'pEs PATENT oFFioE.

BERNARD A. BEHREND, OF NORWOOD, OHIO, ASSIGNOR TO ALLIS- OHALMERS COMPANY, A CORPORATION OF NEW JERSEY, AND THE BULLOCK ELECTRIC MAN UFAOTURING COMPANY, A COR- PORATION OF OHIO.

DYNAlVlO-ELECTFHC MACHINE.

Specification of Letters Patent.

Patented Dec. 18, 1906.

Application filed March 26,1906. Serial No. 308,130.

To all whom it may concern:

Be it known that I, BERNARD ARTHUR BEHREND, a citizen of the United States, residing at N orwood, in the county of Hamiltonand State of Ohio, have invented certain new and useful Improvements in Dynamo- Electric Machines, of which the following is a full, clear, and exact specification.

My invention relates to dynamo-electric machines, and particularly to the means for retaining the conductors in open slots in laminated stationary or rotary cores.

The cores of dynamo-electric machines, both of the rotary and stationary members, usually consist of laminae, which are arranged in groups, the groups being spaced apart by ventilating segments or separators. The separators are usually provided with spacingribs, which not only hold the groups of laminae predetermined distances apart, but in the rotary cores act as fan-vanes to create an outward flow of air to cool not only the core and coils of the rotor, but also the core and coils of the stator. If the core is provided at its periphery with open slots for the reception of conductors, the latter are held in place by socalled sticks orwedges of non-magnetic material, which engage grooves at the outer ends of the teeth. Usually the depths of the grooves which receive the wedges are small as compared with the width of the teeth measured circumferentially, or the distance between adjacent slots. In some machines, however, the slots are very closely arranged, leaving narrow teeth. The result is that the grooves for the wedges on the opposite side of each tooth closely approach each other, and when the wedges are in place only a very narrow opening is left between the wedges. It is seen that in this construction if the ordinary coil-retaining wedges are employed the outward circulation of air is seriously interfered with.

The object of my invention is to provide coil-retaining wedges for cores in which the slots are closely arranged, which will not interfere with the flow of air in the ventilatingspaces.

In carrying out my invention I- provide coil-retaining wedges in which the portions bridging the ventilating-spaces are of less width than the remaining portions. The

width of the wedges at the ventilating-spaces is preferably less than'the width of the slots, so that the wedges do not in the slightest degree restrict the size of the ventilating-openings in the periphery of the core nor interfere with the outward flow of air.

For a better understanding of my invention reference is had to the accompanying drawings, in which Figure 1 is a partial vertical transverse section through the core of a rotor, the section being taken through the ventilating passage-way; Fig. 2 is a plan view of a small portion of the core, and Fig. 3 is an elevation of one of the coil-retaining wedges.

I have illustrated my invention as applied to a rotary member but it is to be understood that it may be applied with equal advantage to the core of the stator. Mounted on the shaft 10 are the core-laminae 11.

, These laminae are, as in the usual construction, arranged in groups, which are spaced apart by separators 12, forming circumferential ventilating passage-ways 13. The groups are held apart by the radial ribs 14:, which act as fanblades in the rotary cores to create air-currents, which pass radially outward, cooling both the rotor and the stator. The periphery of the core is provided with closelyarranged open slots 15., leaving teeth 16, which are narrow measured in a circumferential direction, or, in other words, leaving very short spaces between the slots. The ribs ld'extend outward almost to the ends of the teeth, so that the latter are well braced. Located in the slots are the usual coil-conductors 17, which are well insulated, as shown, and are retained in place by non-mag netic wedges 18 of peculiar construction, which wedges engage grooves or slots 19 near the outer ends of the teeth.

In the usual machines in which the slots are comparatively far apart the depth of the grooves which are engaged by the wedges is small as compared with the space between the slots or the width of the teeth. In those machines, however, in which the slots of the cores are closely arranged, as in the core shown in the drawings, the wedge-retaining grooves on the opposite sides of each tooth closely approach each other, leaving a comparatively narrow opening between the coilwedges when the parts are assembled. If in. such machines the ordinary wedges, which have a uniform width throughout their length, were employed, the ventilating-openings at the periphery of the core would be very much restricted. The ventilating passage-ways are further restricted by the outer ends of the ribs 14 of the spacing members, which ribs, as is shown in Fig. 1, extend outward between the wedges 18.

In order that I may obtain a free How of air through the passage-ways in the core, I provide coil-retaining wedges or sticks, having notched or cut-away portions 20 at each side, which notched portions, when the wedges are in place, occur at the ventilatingspaces. Thus the portions of the wedges which bridge the ventilating-spaces are of less width than the remaining portions which engage the grooves. The width of the wedges at the ventilating-spaces should be not greater than the width of the slot, and I prefer to make the width of the wedges at these points less than the width of the slots, as is shown in the drawings.

WVith this construction it is seen that no matter how closely the slots are arranged nor how deep the Madge-retaining slots are made the outward flow of air through the ventilating-spaces is not restricted to the slightest degree by the coil-retaining wedges.

I aim in my claims to cover all modifications which do not involve a departure from the spirit and scope of my invention.

that I claim as new, and desire to secure by Letters Patent, is

1. In a dynamo-electric machine, comprising a laminated core, the lamime being arranged in groups spaced apart forming ventilating-spaces and having peripheral slots and teeth, coils in said slots, and coil-retaining sticks or wedges engaging grooves in the outer ends of the teeth, the portions of the sticks or wedges bridging the ventilating-spaces being of less width than the remaining portions.

2. In a dynamo-electric machine, a core having circumferential ventilating-spaces, and peripheral slots and teeth, means for creating. an outward flow of air through the ventilating-spaces, conductors in the slots of the core, grooves at the outer ends of the teeth for receiving coil-retaining wedges, and wedges in said grooves, the portions of the wedges bridging the ventilating-spaces being of less width than the remaining portions so as not to interfere with the outward flow of air.

3. In a dynamo-electric machine, a laminated armature, the laminae being arranged in. groups, ventilating-segments between the groups to hold the latter apart so as to permit an outward flow of air through the spaces between the groups, said core having closelyarranged peripheral slots forming teeth, the teeth having grooves near their outer end, conductors in said notches, and means for retaining said conductors in place comprising wedges engaging the grooves at the'outer ends of the teeth, the portions of the wedges over the ventilating-spaces being notched or cut away so as not to interfere with the outward l low of air.

l. A rotary armature, consisting of lamina: arranged in groups, separators or spacers between the groups, said separators having radial ribs for holding the groups predetermined distances apart to form ventilating passage-ways and for creating an outward flow of air through the passage-ways, said lamime having closely-arranged open slots and teeth, said teeth having undercut portions near their outer ends forming when assembled grooves, coils in said slots, and means for retaining said coils in place comprising wedges having portions engaging the grooves in. the teeth, the portions of the wedges bridging the ventilating-spaces having a width not greater than the width of the slots.

In a dynamo-electric machine, a core comprising laminae arranged in groups, means for spacing apart the groups of lami me, said core having closely-arranged pcripheral open slots forming narrow teeth, coils in said slots, and means for retaining the coils in place comprising wedges or sticks engaging grooves at the outer ends of the teeth, the portions of the wedges or sticks bridging the ventilating-spaces being of less width than. the width. of the slots.

In testimony whereof I atlix my signature in the presence of two witnesses.

BERNARD A. BEHREND.

itnesses ARTHUR F. Kwrs, FRED J. KINsEY.