US470785A - Dynamo - Google Patents
Dynamo Download PDFInfo
- Publication number
- US470785A US470785A US470785DA US470785A US 470785 A US470785 A US 470785A US 470785D A US470785D A US 470785DA US 470785 A US470785 A US 470785A
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- current
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- 230000000875 corresponding Effects 0.000 description 8
- LTMHDMANZUZIPE-PUGKRICDSA-N Digoxin Chemical compound C1[C@H](O)[C@H](O)[C@@H](C)O[C@H]1O[C@@H]1[C@@H](C)O[C@@H](O[C@@H]2[C@H](O[C@@H](O[C@@H]3C[C@@H]4[C@]([C@@H]5[C@H]([C@]6(CC[C@@H]([C@@]6(C)[C@H](O)C5)C=5COC(=O)C=5)O)CC4)(C)CC3)C[C@@H]2O)C)C[C@@H]1O LTMHDMANZUZIPE-PUGKRICDSA-N 0.000 description 4
- 230000003247 decreasing Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 230000001105 regulatory Effects 0.000 description 2
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
- H02P9/14—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K19/00—Synchronous motors or generators
- H02K19/16—Synchronous generators
- H02K19/26—Synchronous generators characterised by the arrangement of exciting windings
Definitions
- My present invention relates to dynamos constructed on the principle described in that patent; and it consists in a dynamo with two pairs of brushes, one brush of the positive pair connected to the positive terminal of a circuit of which a portion of the field-coil and translating devices form a part, and the corresponding brush of the negative pair connected to the negative terminal of that circuit, the other brushes of the positive and negative pairs being connected, respectively, to the positive and negative terminals through portions of the field-coil, which always carry less'current than those portions of the fieldcoil which carry the same current as the translatiug devices, the numberof turns of wirein those portions of the field-coil with the smaller current being so proportioned to the number of turns of wire in the corresponding portions with the constant current as to produce equality of ampere-turns at full load, notwithstanding the reduced current in the regulating portions of the coil and the constant current in the other portions of the coil.
- B indicates the comm utator; B, the armature, and D D a positive and negative brush connected with the terminals T T of the circuit which includes portions A A of the fieldcoil and the translating devices.
- the other brushes D D connect, respectively, with the terminals T and T through the coils A and A and the number of turns of wire in these coils A and A is such with relation to the number of turns in the coils A A that while, say, ten amperes through coils A A will give a certain number of ampere-turns half that number of amperes through coils A A will give the same number of ampere-turns.
- any increase of resistance in the work-circuit would tend to instantly decrease the current in that circuit were it not that the diameter of commutation shifts in such a way as to decrease the current through D and D and increase the current through D and D which increases the ampere-turns energizing pole S, and so strengthens the whole field as to keep the current substantially c011- stant.
- ⁇ Vhat I claim as my invention is- In a constant-current dynamo, two pairs of brushes of like sign, as D D and D D one brush of each pair, as D, connected to the corresponding brush of the other pair, as D, by a circuit of which portions A A of the fieldcoils and translating devices form a part, the
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Windings For Motors And Generators (AREA)
Description
(No Model.)
W. H. ELKI-NS. 'DYNAMO.
No. 470,785. Patented Mar. 15, 1892.
PATENT OFFICE,
\VILLIAM H. ELKINS, OF CAMBRIDGE, MASSACHUSETTS.
DYNAMO.
SPECIFICATION forming part of Letters Patent N 0. 470,785, dated March 15, 1892.
Application filed July 11, 1891' Serial No. 399,235. (No model.)
To all whom it may concern.-
Be it known that I, YVILLIAM HENRY EL- KINS, of Cambridge, in the county of MiddleseX and State of Massachusetts, have invented an Improvement in Dynamos, of which the following is a specification, reference being had to the accompanying drawing, which isa diagram illustrating my invention.
In my patent, No. 460,372, dated September 29, 1801, application filed November 28,1890, I have described a dynamo the current in which is kept constant by dividing the circuit into two portions and carrying one of these portions through a part of the field-coil. My present invention relates to dynamos constructed on the principle described in that patent; and it consists in a dynamo with two pairs of brushes, one brush of the positive pair connected to the positive terminal of a circuit of which a portion of the field-coil and translating devices form a part, and the corresponding brush of the negative pair connected to the negative terminal of that circuit, the other brushes of the positive and negative pairs being connected, respectively, to the positive and negative terminals through portions of the field-coil, which always carry less'current than those portions of the fieldcoil which carry the same current as the translatiug devices, the numberof turns of wirein those portions of the field-coil with the smaller current being so proportioned to the number of turns of wire in the corresponding portions with the constant current as to produce equality of ampere-turns at full load, notwithstanding the reduced current in the regulating portions of the coil and the constant current in the other portions of the coil.
B indicates the comm utator; B, the armature, and D D a positive and negative brush connected with the terminals T T of the circuit which includes portions A A of the fieldcoil and the translating devices. The other brushes D D connect, respectively, with the terminals T and T through the coils A and A and the number of turns of wire in these coils A and A is such with relation to the number of turns in the coils A A that while, say, ten amperes through coils A A will give a certain number of ampere-turns half that number of amperes through coils A A will give the same number of ampere-turns. These figures are taken for the reason that the brushes may be so adjusted that if ten amperes be assumed as the current desired in the Work-circuit five will flow through brushes .D and D" and five through brushes D and D making ten through the work-circuit and coils AA, but only five through coils A A Hence coils A A in this example of my invention, will comprise twice as many turns as do the coils A A; therefore the total number of ampere-turns which is suitable for full load.
On any decrease of resistance in the work circuit (as by cutting out one or more lamps) the current in that circuit wouldinstantlyincrease were it not that the diameter of commutation shifts, thereby increasing the current through D and D and decreasing the current through D and D and also decreasing the number of ampere-turns energizing pole S. This so weakens the field that the total current remains nearly constant. Conversely, when the dynamo is running at a minimum load, any increase of resistance in the work-circuit (as by introducing one or more lamps) would tend to instantly decrease the current in that circuit were it not that the diameter of commutation shifts in such a way as to decrease the current through D and D and increase the current through D and D which increases the ampere-turns energizing pole S, and so strengthens the whole field as to keep the current substantially c011- stant.
Of course an ammeteror its equivalent will be used in practice in the usual way, and proper appliances, either worked by hand or automatic, may also be used to more closely regulate the current; but these are matters so familiar to all skilled in the art that they need no description.
\Vhat I claim as my invention is- In a constant-current dynamo, two pairs of brushes of like sign, as D D and D D one brush of each pair, as D, connected to the corresponding brush of the other pair, as D, by a circuit of which portions A A of the fieldcoils and translating devices form a part, the
other two brushes of each pair, as D and D connected to the terminals T T of that circuit through other portions A A of the fieldcoils, the constant current at full load flowing through the main coils A A and a smaller current flowing through the regulating-coils A A and the number of turns of Wire in the regulating-coils being materially greater than the nuinber of turns in the corresponding portions of the main coils, all substantially as described.
NV. H. ELKINS.
Witnesses: I
J. E. MAYNADIER, EDWARD S. BEACH.
Publications (1)
Publication Number | Publication Date |
---|---|
US470785A true US470785A (en) | 1892-03-15 |
Family
ID=2539645
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US470785D Expired - Lifetime US470785A (en) | Dynamo |
Country Status (1)
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- US US470785D patent/US470785A/en not_active Expired - Lifetime
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