US1047821A - Dynamo-electric machine. - Google Patents

Description

J. G. MAGFARLANE & H. BURGB. DYNAMO ELECTRIC MACHINE. APPLICATION FILED FEB.17',1911( Patented De0.17,1912.

UNITED STATES PATENT OFFICE.

JAMES Ci MACFARLANE AND HARRY BURGE, OF CHELMSFORD, ENGLAND, ASSIGNORS TO THE FIRM OFCROMPTON & COMPANY LIMITED, 01'! CHELMSFOB-D, ENGLAND.

DYNAMO-ELECTRIC MACHINE.

Specification of Letters Patent.

Patented Dec. 1'7, 1912.

Application filed February 17, 1911. Serial No. 609,129.

MACFARLANE and HARRY BURGE, subjects of the King of Great Britain, residing at Arc Works, Chelmsford, in the county of Essex, England, have invented certain new and useful Improvements Relating to Dyna-mo- Electric Machines, of which the following is a specification.

This invention has reference to improvements relating to multipolar dynamo-electric machines and it has for object an improved construction of dynamo or motor of lighter and more accessible design than hitherto.

Bi-polar dynamo electric machines are known in which the yoke is arranged longitudinally of the armature spindle and forms part of the magnetic circuit of the machine, besides forming supports for the armature bearings, but the distribution of the flux in a multi-polar machine constructed in this manner is entirely different to that in a bipolar machine, and moreover in a multipolar machine the polepieces are capable of being arranged so as to be withdrawn from the machine without disturbing the armature whereas in a bi-polar machine they cannot be so withdawn.

In the herein described multi-polar machine the magnetic circuit from a north to a south pole, both of which are above the armature or both of which are below the armature, takes place as is usual in a plane perpendicular to the armature axis whereas the magnetic circuit from a north pole situated above the armature to a south pole situated below the armature or vice versa takes place in planes parallel to the armature axis and vertical planes perpendicular thereto. A portion of the return flux therefore is carried by a magnetic circuit partly parallel to the armature spindle and partly perpendicular thereto and the iron of which such circuit is composed can therefore be used as a support for the armature bearings.

The appearance of the machine is that of a box having a top, a bottom and two ends, the sides of which have been removed, the poles being removably attached to the top and bottom and the armature being mounted in bearings carried by the ends.

If the pole pieces are mounted in a' ring shaped yoke, the plane of such ring instead of being arranged-perpendicular to the armature axis is arranged in the plane of the armature axis and supports the armature bearings.

One constructional form of the invention 1s illustrated in perspective in the accompanying drawings, the armature shaft being omitted forv the sake of clearness.

The field magnets A, A, and B, B, and armature (not shown) are embraced by a frame consisting of a substantially U-shaped pedestal portion C having superimposed thereon and magnetically connected thereto an inverted substantially U-shaped upper portion D, the armature spindle being mount ed in bearings carried at E, E, by the sides of said frame which lies in the longitudinal vertical plane of the armature. One pair of pole pieces B, B, is carried upon the pedestal portion C and the other pair A, A, is carried upon the upper inverted U-shaped portion D of the frame, each pole piece being mounted within the frame so as to be capable of removal therefrom laterally of the machine without dismantling any other portion of the machine. The lower pair of pole pieces B, B, may be attached to the pedestal portion G, by means of bolts, not shown, and the upper pair of pole pieces A, A, may be removably secured to the upper portion D of the frame by means of bolts F; the yoke being raised or tilted until the bolts holding the pole pieces B, B, become accessible and can be unscrewed, after which said pole pieces are withdrawn laterally. Normally, the sides of the machine are completely open, but if desired protecting side covers may be det-achably mounted upon the frame at each side. pole pieces and field coils may easily be withdrawn from the machine for rewinding of the coils or for repairs without removing the 'ari'nature, and when this is done the armature may be re-woundl'in aim without further dismantling the machine, and the brush gear and commutator are all readily 100 accessible through the open sides of the fran'ie. Further since the frame forms part of the magnetic circuit of the machine, and also forms a support for the armature bearings, the weight efficiency of the machine is 105 increased. Moreover the construction con duces to better ventilation of the armature.

What we claim is In a multi-polar dynamoelectric machine,

a. two-part yoke consisting of a pair of mu- 110 By means of such'a construction the tua'fiy opposed verhically arrangfi U-shaped members connected together detachably and magnetically, a pair of pole pieces mounted within each of said U-shaped members, the connection between said members being out of the line of magnetic flux 0f the pole pieces, each of said pole pieces being withdrawable laterally cutward of the structure without interference with any other part means to connect saici U-shaped members, and means accessible exizernally of the structure to c0nnect each of said pole pieces with said U- shaped members.

In testimony whereof we have hereunto JAMES C. MACFARLANE. HARRY 3URGrE.

Witnesses:

F. W. MARTIN, C. S. CAss.

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