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Патент USA US2084527

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June 22, 1937.
‘- -
A.'V. E. c. GUILBERT '
‘ Filed Sept. 21, v1933
Patented June 22, 1937
UNITED vsmrlezs -, PATENT
André Vincent Ernest Cyrille Guilbert, Paris,
Application September 21, 1933, Serial No. 690,402
In France September 24, 1932
3 Claims.
(Cl. 171-313)
The invention relates to improvements in in
stallations employing dynamos of the three-brush
type and in the construction and arrangement of
such dynamos themselves.
Referring to the hitherto proposed arrange
ment of Fig. 1, the normal brushes of the dynamo
are shown at I, the “third” brush at 2, the induc
ing windings at 3, whilst 4 is the consuming cir
Dynamos cf the “three-brush” type possessvthe
well-known property of giving a constant output
current for a relatively wide scale of speeds, on
the condition that the voltage at the terminals is
exactly determined and maintained at a constant
cuit and 5 the battery of accumulators. In the
arrangement according to the invention of Fig. 2,
however, there is provided a second consuming
circuit 6 and in 'seriesgtherewith a compensating
winding ‘I mounted on the ?eld'poles 8, as shown
more particularly in Figs. 3 and 4, ami which is
intended to neutralize the effects of the trans
10 value, such as by means of’ a battery of accumu
lators. This property is obtained by means of a
shunt excitation connected between a normal verse reaction of the armature for the current
brush corresponding to a neutral line and an . ?owing ‘in the second circuit ,8. The brushes I,
auxiliary brush mounted at the same level as a
mounted on the neutral line, and the “third
15 conductor situated beneath'the leading pole tip
of the succeeding pole.
The distortion‘ of the charging magnetic ?ux,
due to the transverse reaction of the armature,
which is variable for a same current in the arma
gi.) ture' with the value of this flux, causes, for a same
voltage at the terminals of the dynamo, a progres
sive reduction in the voltage of the excitation cur
rent when the speed increases, whence the de
sired regulating effect on the output current.
It is thus necessary to obtain equality‘between
M the power of the dynamo, the charging power of
the battery and the power required under perma
nent working conditions.
One object of the present invention is to avoid
30 the use in such installations of a dynamo such as
de?ned above
Other objects and advantages of the present
invention, together with particular constructional
details of various embodiments thereof, will be‘
3;, more clearly understood from the following de
scription given by way of example with reference
to the accompanying drawing, in which:
Fig. 1 represents diagrammatically the- usual
connections employed for “three~brush" dynamos.
Fig. 2 represents diagrammatically the im
proved connections according to the invention.
Fig. 3 represents diagrammatically one form of
realization of the compensating means.
Fig. 4 represents diagrammatically a . second
45 simpli?ed form of realization of the compensating
It will be seen from the following that the in
vention permits of utilizing a dynamo having a
power which is greatly superior to the’charging
50 power of the battery, of obtaining under perma.—
nent operating conditions from the two circuits
the whole of the power which can be furnished by
the dynamo and of only requiring from the latter,
when no consuming device is in use, the charging 55 power of the battery.
brus ” 2 which is out of line with regard to the 15
brushes I, are arranged in the same manner in
Figs. 1 and 2, as well as the inducing windings 3
and the ?rst consuming circuit 4, with which are
mounted in parallel the dynamo and the battery
of accumulators 5, and a make-and-break device
9 is provided for disconnecting the dynamo from '
the circuits] and 6.
As a result of the use of the compensating wind
ing ‘I, no disturbance will occur in the ?rst circuit
with regard to the normal functioning of the
“three-brush” dynamo, due to the fact that the
distribution of the ?eld in the air gap and of the
potentials on the collector remains only a func
tion of the current which ?ows in this ?rst
Theoretically, the compensation is obtained in a
well-known manner by arranging in slots I0 pro
vided in the pole pieces a distribution of ampere
turns which is identical but opposed to that of the
armature. Fig. 3 shows clearly the manner in
which this method of winding is obtained. In
this ?gure, the numerals I, 2, 3, 4, 5, 8, 'I, 8 and 9
indicate the same parts as in Fig. 2. It will be
seen that the compensating winding ‘I is provided
in slots III formed in the faces of the pole pieces
3 adjacent the air gap between the pole pieces 3
and the armature of the dynamo. vThe part ‘II
of the compensating winding is electrically con
nected to the circuit 4 by the conductor II, and
to the part ‘I2 of the winding ‘I by the conductor
I2‘. The part ‘I2 is connected to part ‘I3 by the
conductor I3, the part ‘I3 is connected to part ‘I4
by the conductor I4 and the part ‘I4 is‘connected
to the circuit 8 by the conductor I 5. The arrows
indicate the direction of the currents in the parts
of the compensating winding and in the conduc
tors of the armature.
It is known in effect that the transverse re
action of the armature weakens the ?eld in the
air gap under the leading pole tips of the poles 55
. and strengthens it on the contrary under the trail
ing pole tips. In the present case, the zones where
pair of main brushes and a third brush, and hav
ing pole pieces excited by windings shunted across
‘the compensation must be felt are essentially the one of said main brushes and said third brush, a
leading pole tips under which is induced the elec ' ?rst consuming circuit fed by said main brushes
5 tro-motive iorce supplying the excitation. This and containing a source of voltage, a second'con- 5
remark may result in the fact that only a partial suming circuit in parallel with the ?rst but con
localized compensation at the level of the leading taining no source of voltage, and means for neu
pole tips is e?ected. This compensation may also tralizing that portion of the armature re-action
be realized in a simple manner by means of a
which is due to the current ?owing in said second
10 singlewinding I] on the pole, this-winding H, g consuming circuit, said means comprising a com- 10
passing through a single slot I! as represented in 'pensating winding connected in series with said
second circuit and-disposed in slots on the faces
oi said polepieces at least in the region of the
The increase in the ?ux at the level of the trail
Fig. 4.
ing pole tips caused by the
e of the current
I leading pole tips.
2. In combination, a dynamo equipped with a 15
to the absence oi compensation in this place is pair of main brushes and a third brush, and hav
not considerable, even at great speeds, due tothe * ing pole pieces excited by windings shunted across
saturatba ‘ oi the teeth poi
armature under one. or said main brushes and said third brush;
a ?rst consuming circuit ied by said main brushes
these pole tips and the increase in the electro
20 motive force of ‘the dynamo which results there ‘and containing a source of voltage, a second con- 20
from permits of reducing somewhat the vcompen . suming circuit in parallel with the ?rst but con
15 of the second'circuit 6 in the armature and due
sating ampere turns of the windings I] of Fig. 4.
taining no source of voltage, and means for neu
The compensation thus established is thus doubly tralizing that portion of‘ the armature re-action
economical and constitutes an important improve
- 25 ment according to the present invention.
It is
not necessary that compensating windings should
It will be realized that the comparison of the
which is due to the current ?owing in said second
consuming circuit, said means comprising a com 25
pensating, winding connected in series with sai I
second circuit and distributed in slots over th
‘faces oi’ said pole pieces.
partial compensation to a sort of compound con
3. ,In combination,'a dynamo equipped with a
_30 nection only relating \to a traction’ of the pole pair 01 main brushes and a third brush, and hav- 30
piece should be avoided. A classical compound ing pole pieces ‘excited by windings shunted across
connection relating to the whole of the pole has I one of said main brushes and said third brush,
a ?rst consuming circuit ied' by said main brushes
for object to render the functioning of the “three
brush” dynamo theoretically independent of the and containing a source of voltage, a second con
35 current ?owing in the second circuit for a single
‘speed in the neighbourhood of which this last
solution although imperfect may be considered
suming circuit in parallel with the ?rst but con- 35
taining no source of voltage, and a compensating
winding in series with said second circuit. and dis
posed adjacent the air gap between said pole ,
It willbe understood that the embodiments pieces and armature, said compensating winding
40 above described have been given by way of ex
ample and that the invention is only limited inso
being so proportioned and arranged that the 40
' ampere turns due thereto are substantially equal
far as is necessitated by the prior ‘art and the M but opposed to those due to the ?ow of_ the same
current’ in the armature.
spirit of the appended claims.
I claim:—
'45 Llncombinatiomadynamoeqi?ppedwitha‘a
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cvmmm: GUILBERT.
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