US843489A - Parallel running of dynamo-machines. - Google Patents

Description

No. 848,489. PATENTED FEB 5, 1907. C. A. PARSONS & G. G. STONEY.

PARALLEL RUNNING OF DYNAMO MACHINES.

APPLICATION FILED JULY 25, 1905.

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No. 848,489. PATENTED FEB. 5, 1907. O. A. PARSON$ & G. G. STONLY. PARALLEL RUNNING OF DYNAMO MACHINES.

APPLICATION FILED JULY 25,1905.

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PATENTED FEB. 5, 1907. G. A. PARSONS & G. G. STONEY. PARALLEL RUNNING 0F DYNAMO MACHINES.

APPLICATION FILED JULY 25,1905

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- flra/W No. 843,489. PATENTED FEB. 5, 1907. 0. A. PARSONS & G. G. STONEY. PARALLEL RUNNING 0F DYNAMO MACHINES.

APPLICATION FILED JULY 25, 1905.

4 SHEETS-SHEET 4.

CHARLES ALGERNOX PARSONS AND GEORGE GERALD STONEY, OF

.NEWCASTLE-L'PON-TYN E, EN GLAND TO SAID PARSONS.

; SAID STONEY ASSIGNOR- PARALLEL RUNNING OF DYNAIVlO-IVIACHINES.

Specification of Letters Patent.

Patented Feb. 5, 1907.

' Application filed July 25, 1905. Serial No. 271,248.

Be it known that we, CHARLES ALGnnNon PARSONS anl GEORGE GERALD STONEY, subjccts of theKingol' Great Britain and Ireland and residing at lleaton Works, Newcastleupon'ly11e,ln the county ol Nort hum berland, England, have invented certain new and useful improvements Relating to the Parallel Running of Dynamo.\lachines, of which the following is a specification.

()ur invention relates to the parallel run ning of continuous-current lynamo-machines which are compensated for armature reaction. In such machines We have found in certain instances dilllculty in running in parallel with other dynamos when the limbs of the magl'iets have had compounding coils iitted. it is also possible that such dilliculty might arise in the case of plain shunt-wound machines titted with our compensating coils. \Ve are aware that equalizing-wires have been used in the case of the compound windings on dynamos to obtain stability of load when two or more machines are run in parallel; but we have found that such an arrangement is not sui'licient in some cases to obtain stability when using our compensating winding.

The object of this. invention is to enable dynamos which are compensated for armature reaction to run in parallel, automatically dividing the load between them.

The invention consists in cross-connecting part of the compensating coils as well as part or the whole of the compounding coils by an equalizing wire or wires, so as to obtain stability of running under all conditions.

Referring to the accompanying diagrammatic drawings, Figure 1 shows one method of applying our invention. Fig. 2 shows another modification. Fig. 3 shows a variation of the arrangement shown in Fig. 2. Fig. 4 illustrates a modification in which a combined compensating and reverse comnoundii'lg coil is used. Fig. 5 shows the applicatiorrof the invention to machines having a Deri serics compensating winding, while Fig. 6

shows our invention appliczl to machines having a series compensating coil which at the same time gives compounding or overco1npoundin Fig. 7 diagrannnat t-ally illustrates the connections of the compensating coil according to one form.

In the arrangements illustrated two dynamos are arranged in parallel, (1 (I bring the armatures and Z) Z) the shunt field-coils. In the modification shown in Fig. 1 we cross connect by an equalizingavire (a at points intcrmediate between the brushes 0 c of the dynamos and the points f f, where the compensating windings (Z (Z are connected to the compounding coils g g. The compensating windings consist of current-carrying conductors connected in series with the armature, fixed around, but not attached to, the armature periphery-for example, by embedding them in the polar faces and carrying them be tween the poles on suitable non-magnetic segments. This is diagraml'i'iatically represented in Fig. 7 ,wherein the coil 1, shown thus for clearness arranged around the armature space and partly carried by nonmagnetic scgments 2, is connected in series with the ordinary compound winding 3. The polar plane of the compensating winding preferably coincides with the plane of commutation at no load, yet in some cases it is preferred to place it at an an gle thereto by suitably disposing the winding in. order to secure in some classes of machine a minimum of sparking at all intermediate loads to full or over load. For example, in Fig. 7, which may for this case be considered as an eX- planation of Fig. 4, the plane of commutation at no load is represented by the line UVVV and the plane of the compensating winding by XVY, the angle between them being UVX. It will be seen that the effect of this method of connection is that with varying load part of the compensating coils have a constant excitation equal to the mean output of the machines coupled in parallelthat is to say, suppose, for example, a heavier current were lowing in the lower coil (Z between 0 and 0 than in the upper coil (Z be tween 0 and c then current would flow through c in an upward direction, according to thediagram, the eilcct being that the current in the parts of both the lower and upper coils between 6 andwould be equal and of a value equal to the mean output of the machines, as stated. Thus the equalizing wire or wires are so placed that the whole of the compounding coils and parts-namely, cfof the compensating coils pass the mean current, while the other parts namely, 6, eof the compensating coils pass the current delivered by the individual machine.

In the arrangement shown in Fig. 2 we lit reverse turns of compounding coils 7t It between the compensating coils (I (Z and the forward compoui'iding ccils g g and connect the equalizing-wire c at or near the point where the reverse turns of the compounding 72/ it are joined to the ordinary compounding coils. The action and use of the reverse windings is explained clearly with rclbrence to Fig. 2. It is well known that for two compoundwound machines to run in parallel they must be designed to give a drooping characteristic as the load incrtaises, or else should one take more than its share of load or tend to drive the other as a motor the ordinary compounding turns would continually ii'icreasc the effect until the machine was cut or burned out. Reverse compounding turns it are therefore connected, as shown, between the wire 6 and the machines in order to obtain, as is quite obvious will be obtained, a drooping characteristic, for the reason explained above. In order, however, that the excitation of the machine as a whole shall rise with the load, as with an ordinary compoundnvound machine, forward compounding turns 9 are inserted at a point beyond the equalizing con nection, whereby they do not tend to destroy the satisfactory parallel running of the machines, but yet givethe rising characteristic for the machine as a whole. It is thus seen that the number of forward compounding turns may be either equal or unequal to the number ol" reverse, as required.

In Fig. 3 rever e turns of compounding 7t 72- are placed between the compensating coils (Z (Z, and the brushes (1 c and-the equalizingwire a are attached at the pointsff, where the compensating coils d d join the forward compounding coils g g.

In the modification illustrated in Fig. 4 we combine the con'ipensating coil and the reverse compounding coil in each machine in one equivalent coil 7c, which is similar to the ordinary compensating coil, but the polar axis of which is inclined to the ordinary position of such axis, as stated above, in a reverse direction to the din ction of rotation, as stated above, and we attach the equalizing-wire at the points ff, as shown in the figure.

\Ve may also apply our invention, as above described, to any other arrangements for compensating armature reaction, such as the Dori, in which a winding in series with the armature is used with or without conmmtating-poles, and parallel running of such machines will be thereby improved. Fig. 5 shows such an arrangement as applied to a machine provided with a distributed shunt- 3 winding 1) and a series winding (1, the positions lor the equalizing wire or wires being shown at e, and similarly in such machines by dividing up the series winding into two or more parts the ar 'angements shown in Figs. 1 to 4 may be applied.

In many machines in which a series compensaiing coil is used said coil has been so llllCtl. as at the same time L0 give compounding or overcompounding, as desired. '0 have tound that by placing an equalizing wire or wires (2 (M an iniermediate point between ihe main ierminal of rho series winding d and the brushes c, as shown in Fig. (5, parallel running is improved. We have also found that parallel running is improved by dividing said winding iii-.o iwo parts, one ol' which compcnsaes tor armature reaciion only, while the other gives the desired compounding. Al.erna;ivcly reverse compound ing turns may be hired, or kllUCOlllPGllSZLllllg winding may be so placed as to .increascthc drop of voltage between hill and no load, the equalizing wire or wires in all these cases being arranged in a similar way to that above described.

We do not *ish to be understood as limiting our invention to the particular forms herein shown and described, as we have merely illustrated and described convenient forms of the invention, which may be varied widely with the range of electrical skill wills out departing from the spirit of the invention. For example, instead in one form of an equalizing-wire connecting the junction of torward and reverse compounding turns it may connect points in the compensating windings, or instead of an equalizing-wire connecting the junctions of compensating and compounding turns it may connect points in the com pensaiing windings.

Having thus described our invention, what we claim as new, and desire to secure by Letters Patent, is

1. In combination, a plurality of continuous-current dynamo-macllines having series coils compensating for armature reaction; and an equalizingavire cross-connecting certain points within the compensating windings of the two machines, as and for the purpose described.

2. In combination; a plurality of continuous-current dynamo-marllines having series coils compensating for armature reaction; compounding coils on said dynamo ma chines; and an equalizing-wire cross-connecting certain points within [lie compensaiin'; windings of the two machines as well asthe compounding coils; as and [or the purpose described.

53. In bombinaiion; a plurality of continuous-current dynamo-marllines having series coils compensa'i ing tor armat ure react ion and compounding the machine. said coils being divided llitt) two parts one ol' which compensates lor armature rea :iion, while the other gives the eonipounding, and. an equalizingwiro cross-connecting certain points within the ci'impensaiing windings ol' the two machines, as and for the purpose described.

4. In coinbinazion, a plurality of continu- ICO ens-currerd dyna ino-meehines having series coils eonlpenszn ing for armature reeerion and eoniponndin rhe machine said coils being divided im 0 1W0 pin-is, one of which compenszries l'or urnnnure rezieiion, while the oiher gives the eoinpeuinling, reverse eomponndin; inrns; and an equalizing-wire eross-eonnearing (err inn ponns \Vlllllll the eonipensniring' windings of 'ihe 1W0 machines, as and for ihe purpose described.

5. ln (fUlllhllllhlOll; a plurzrliiy ol eoniinuens-current (lyinnno-imrehines having series eoils eoinpenszn ing for :Lrnniinre l'OllCLlOll and compounding ihe nniehine, szrid coils being divided i111 0 two aris, one of which compensates for {LIIIHUUI'O reaction, while the other gives the roniponnding, reverse compound ing iurns incorporzned wiih szrid compenseh in coils, and :in equalizing-wire erossmonnewline verinin poiins \\i1l1in the compensating windings of ihe 1W0 machines, as and [or rlie purpose. described.

In resiiniony whereol we have signed our names 1o ihis speeilieuiion in the presence of two subscribing nilnesses.

lllllllillh' Alillllllxllx PARSONS. (llllllillll lilllli-llill STUNEY. Witnesses: i i

HENRY Gnixniui DAKYNS, J12, FREDERICK GORDON .lIAY BEDl-ORD.

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