US1358736A - Commutator-cylinder - Google Patents

Description

R. E. HELLMUND.

COMMUTATOR CYLINDER.

APPLICATION FILED SEPT. 10, 1917.

1,358,736. Patented Nov. 16,1920,

RUDOLF E. HELLMUND, OF SWISSVALE, PENNSYLVANIA, ASSIGNOR TO WESTING- HOUSE ELECTRIC & MANUFACTURING COMPANY, A

SYLVANIA.

CORPORATION OF PENN-.

COMMUTATOR-CYLINDER.

Specification of Letters Patent. P t t N0 1 1920 Application filed September 10, 1917. Serial No. 190,504.

T 0 all whom it may concern:

Be it known that I, 'RUnoLF E. HELLMUND, a citizen of the German Empire, and a resident of Swissvale, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Commutator-Cylinders, of which the following is a specification.

My invention relates to commutator cylinders for dynamo electric machines, and it has special relation to means for connecting armature conductors to the conducting bars of such cylinders.

The object of my invention is to provide a novel form of commutator cylinder in which a larger number of conducting bars may be embodied in a commutator cylinder of a given diameter than has been possible with previous constructions.

The apparatus disclosed in this application is an improvement upon that described in the co-pending application of Vero M. Allen, Serial No. 199,627, filed Nov. 1, 1917, assigned to the W. E. & Mfg. Co.

As heretofore constructed, a commutator conducting bar comprises a longitudinal portion, which is so placed as to extend parallel to the machine axls, and a radially extending portion at right angles thereto, usually known as the neck, to which the armature conductors are electrically connected. The number of bars in a commutator cylinder of a given diameter is not limited by the widths of the bars, which may be made relatively narrow, but by the combined widths of the necks, the armature leads at the points where they are connected and the insulation between adjacent necks. This limitation has given rise to some difficulty in designing commutator cylinders havin a large number of bars, without unduly 1ncreasing the diameter, for instance, in commutator cylinders for use in high-voltage direct-current machines.

In the accompanying drawing, Figure 1 is a view, partially in elevation and partially in section, of a commutator constructed in accordance with my invention. Fi 2 is a sectional View of the commutator s own in Fig. 1, taken along the line 11-11 thereof. Fig. 3 is a sectional view of a commutator embodying a modification of my invention, and F 1g. 4 is a sectional view of the commutator shown in Fig. 3, taken along the line IV-IV thereof.

Referring more particularly to Figs. 1 and 2, the commutator cylinder comprises two sets of conducting bars 1 and 2 which are circumferentially arranged upon a suitable supporting member. The bars 1 are provided with necks 3 to which armature leads 4 are electrically connected. The necks 3 of the bars 1 are longitudinal projections from the bars and are a relatively short distance from the axis of the shaft of the machine. Conducting bars 2 of the other set are provided with necks 5 to which armature leads 6 are electrically connected. The necks 5 of the bars 2 project radially from the bars and. are a relatively greater distance from the axis of the shaft than the necks 3. The bars 1 and 2 are alternately arranged around the commutator cylinder so that the armature leads of various bars will not interfere with each other on account of the necks of the alternate bars being at different distances from the commutator axis. The necks of the conducting bars 1 and 2 may be welded into slots in the bars.

In Figs. 3 and 4 I show a commutator comprising alternately arranged sets of con ducting bars 7 and 8, the bars 7 being provided with necks 9 and the bars 8 being provided. with necks 10. The necks 9 of the bars 7 are situated at a greater distance from the axis of the shaft than the necks 10 of the bars 8.

The bars 7 and 8 are insulated from each other by strips of insulating material 11 and each of the bars 7 is provlded with a narrow portion 12 which serves as a bracing member for the neck 10. In like manner, each of the bars 8 is provided with an upwardly extending narrow portion 13 which serves as a bracing member for the necks 9 of the bars 7.

By assembling a commutator cylinder in the manner described, so that the necks of the alternate bars are at different distances from the axis of the shaft of the machine, a larger number of bars may be used than would otherwise be possible, as previously pointed out.

While I have shown my invention in a plurality of forms, it will be obvious to those skilled in the art that it is not so limited but is susceptible of various minor changes and modifications without departing from the spirit thereof, and I desire, therefore, that only such limitations shall be placed from the cylinder axis.

8. In a dynamo electric machine, a comutator cylinder comprising two sets of alternately (IllSPOSQCl bars, the necks of one 7 set of pro ecting longitudinally and those of the other setprojecting radially.

l. in a dynamo-electric machine, a com- 'niutator cylinder comprising two sets of alternately disposed bars provided With necks, the neclrs of the two sets being;- Vdisposed at different radial and also different longitudinal distances from said cylinder.

In testimony whereof, I have hereunto subscribed my name this 20th day of August 191 RUDOLF n. HELLMUN D.

Images