US1563110A - Rotor for electrical machines - Google Patents

Description

Nov. 24 1925. 1,563,110

w. REGIELEIN ET AL ROTOR FOR ELECTRICAL mcumns Filed Sept. 15, 1924 9/ 3 s :Fif m/ I I I I F- 207 5 ,9 5

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Patented Nov. 24, 1925.

UNITED STATES earsur orator...

\VILHELM REGELEIN AND RICHARD SAMEITE-E, G MULI-IEIM-ON-THE-RUHR, GER- llrIANY, ASSIGNORS TO THE FIRM THYSSEN 6t 30., AKTIENGE$ELLSCHAFT, O35 MUL- HEIM-ON-THE-RUHR, GERMANY.

ROTUR FOB ELECTRICAL MACHINES.

Application filed September T 0 all whom it may concern Be it known that we, WI HnLM REGELEIN and RICHARD SAMEITH, German citizens, and residing at Mulheim-on-the-Ruhr, Germany, have invented certain new and useful Improvements in a Rotor for Electrical Machines (for which we have made application for patent in Germany on the 5th February, 1923, No. 406,970), of which the following is a specification.

With rotors of electrical machines having coil holders inserted therein, the keying of the rotor was heretofore effected insuch a way that the key was kept wedge-shaped in its longitudinal direction and received a wedge-shaped metallic base (key bar). ith this arrangement, by driving-in the key a tightening of the inserted coil holders in radial as well as in tangential direction of the rotor was obtained, the rotor coil serving as counter-bearing for the key bar. 111 spite of said rotor coil being very carefully made, strongly pressed, and baked in the oven, it is as a constructional element in combination with metallic machine elements never so compact that with a complete drying-out of the insulation between the single sections it could not shrink still further, especially if a strong subsequent pressure is exerted thereon by the keying mentioned. Consequently, with the hitherto known rotor construction the initially firmly fixed coil holders and keys get loose after some time. A further drawback in this respect results from the insulation inserted above and below the coils.

Finally with a strong driving-in of the keys the insulation of the coils serving as a counter-bearing is frequently damaged, whereby contacts between the rotor coils and core are produced.

The present invention has for its object to overcome said drawbacks. To this end, the keys are so shaped and arranged between said coil holders that, together with the outer coil holder heads, they tangentially tighten the rotor circumference and pull the coil holders in radially outward direction, so that the tightening does not increase the pressure on the rotor coils.

The accompanying drawing shows how the invention is put into practice.

Figs. 1 and 2 are fragmentary cross-sec.-

15, 1524.. Serial No. 737,813.

tions of a rotor showing two modifications of the improved arrangement;

Figs. 3, f and 5 are different edge views of parts of said rotor.

Fig. 6 is a top View of one of the keys employed. With the improved arrangement, the keys 1 of hexagonal cross-section, which in their longitudinal direction have parallel upper and lower surfaces (see Figs. 1 and 2), are longitudinally tapered at the four remaining surfaces only (see Fig. 6) and can be driven-in simply by slight hammer strokes. The rotor coils 2 can be secured in position by inserting underlayers 3 known in the art. The coil holders 4, which are anchored in the slotted rotor core R in the ordinary way and provided with heads at theirouter ends, are, by the tangential tightening of the outer rotor circumference produced by driving-in said keys between the heads of adjacent coil holders, pulled in radially outward direction. Thus, the tightening does not increase the pressure on the rotor coils.

The invention gains special value for the wholesale manufacture of electrical machines, because the improved construction does not require the same high. factor of exactness for the manufacture of the single members of the rotor as heretofore. Furthermore, the exact adjustment and machining of each single key and coil holder can be reduced to a minimum. At those places where, instead of the coils, iron pole-pieces 5 (Figs. 2 and 3) are located, the keys 1 can further be tightened in radially outward direction by means of pressure-screws 6.

To equalize inexactnesses in the wholesale manufacture of the keys and coil holders, insertions 8 of appropriate material may be provided (Fig. 2).

To mount the keys 1, it is not necessary to drive all of them in by hammer strokes, but this may be done with some of them only, particularly at the iron pole-pieces 5, while at the coils 2 the corresponding keys indicated by 1 in Figs. 1 and 2 can first be loosely put in place only. The tightening action of the keys 1 driven-in at the iron pole-pieces 5 is then distributed in tangential direction over the whole rotor circumafter finished insertion of the keys 1 and finally act also to pull the coil holders in radially outward direction. Thereby, a further simplification in the mounting of the rotor is obtained by the number of the keys to be driven-in being essentially reduced.

A. particularly reliable tightening in all rotor cross-sectional planes, independently from the rotor length and from non-um formities of the single rotor elements, can be obtained with the improved rotor construction by subdividing in the longitudinal direction of the rotor and in a way known in the art the keys 1 (1) (Figs. 4c and The length of the sections of said keys corresponds preferably to the length of the respective coil holders. The tightening of said sections can be effected either by pressure-screws 6 (Fig. l) or by wedge-like connection (Fig. 5).

What we claim, is:

1. In a rotor for electrical machines: the combination with a slotted core, coils on the periphery thereof, and coil holders inserted in said slots having heads at their outer ends, of means extending between the heads of adjacent coil holders comprising keys so shaped and arranged that together with the outer heads of the coil holders they tangentially tighten the rotor circumference and pull the coil holders in radially outward direction without increasing the pressure on the rotor coils, substantially as set forth.

2. In a rotor as specified in claim 1: equalizing insertions between said keys and said coil holders.

In testimony whereof we have hereunto set our hands.

WILHELM REGELEIN. RICHARD SAMEITH.

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