US1326328A

US1326328A - Regulator for variable-speed generators.

Info

Publication number: US1326328A
Authority: US
Inventors: John B Dyer
Original assignee: Westinghouse Electric and Manufacturing Co
Current assignee: CBS Corp
Priority date: 1917-11-07
Filing date: 1917-11-07
Publication date: 1919-12-30
Anticipated expiration: 1936-12-30

Description

' J. B. DYER. REGULATOR FOR VARIABLE SPEED GENERATORS.

APPLICATION FILED NOV. 7'. HH 7. I

Patented Dec; 30,1919.

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WITNESSES: INVENTOR WM 175/70 509w UNITED. STATES PATENTOFFICE.

JOHN B..IDYER, OF PITTSBURGH, PENNSYLVANIA, ASSIG-NOR TO WESTINGHOUSE ELECTRIC AND MANUFACTUBING- COMPANY, A CORPORATION OF IfENNSYL- VAN IA.

REGULATOR FOB VARIABLE-SPEED GENERATORS.

To all whom it may concern."

Be it known that-I, JOHN B. DYER, a citizen of the United States, and a resident of Pittsburgh, in the county of Allegheny 6 and State of Pennsylvania, have invented a new and useful Improvement in Regulators for Variable-Speed Generators, of which the following is a specification.

My invention relates to an automatic regulator for the field excitation of a variable speedgenerator such, for instance, as a generator that 1s mounted upon an automob le or other vehicle and is adapted to supply current to a storage battery and to other deing within the structure of the generator in connection with which it is used.

My invention is illustrated in the accom} zslpanying'drawing, Figure 1 of which is a view in side elevation of a regulator em-- bodying the same; Fig. 2 is-a plan view of the regulator; and Fig. 3 is a simple diagram illustrating its circuit connections.

The regulator comprises an electromagnet having a U-shaped magnetizable member 1 that provides the outer legs of the electromagnet, and a central cylindrical leg or member 2 that is threaded in the member 1 and is provided in its threaded end with a slot for the reception of a screw-driver for effecting adjustment of the operation of the regulator. The threaded end of the central leg 2 is also provided with a lock nut 3 for securing the member in its adjusted position.

The other end of the central leg 3 is somewhat enlarged so as to constitute the main pole'of the electromagnet. The central leg 2 is surrounded by a main energizingcoil 4 that is connected in 'shuntto the armature of the generator 28 in connection with which the regulator is used. In some cases, it may be preferable or desirableto employ a small serles coil-6 also which is adapted to be connected in series with the armature 5, as

shown in Fig. 3, and preferably arranged to oppose the coil 4.

Attached to the ends of the U -shaped 4 and 6 areconnectedi The core member Specification of Letters Patent. I Patented Dec. 30, 1919.,

' v y (p Application filed November 7, 1917. Serial Nfo. 200,663. I

plate 9. The armature 11 is restrained from I engagement withthe end of the member 2 by means of two

plate springs

13 and 14 that are ivoted thereto at one end, the free end of the Spring 13 engaging a stop or lug 15 that constitutes a part of the plate 9. The

. spring 13 is bi-metallic, that is, it is composed of two different metals, such as nickel and steel, that have difierenttemperature eXpansion-co-eflicients, for a reason which will be more fully explained hereinafter.

The free end of the spring 13 is separated somewhat from the spring 14 in order that it may serve as the main restraining means for themovements of the armatureunder normal conditions.

Attached to the, spring l4 is a contact' member 17 that 1s adapted to engage and disengage a cooperating contact member 18 carried by another plate spring 19, one ,end'

of which is rigidly attached to the 'U-shaped magnetizable core by means of the. rivets 8,

insulating pieces 21, however, being em -ployed to insulate the bracket from'the other parts of the regulator. The bracket 20 is .also provided with an ear or lug 22 to per mit of connecting the same to the circuit to be controlled by the regulator. Attached to the free end of the spring 19 on the side opposite the contact member 18 is a fiber, or

other suitable wear piece, 23'that is adapted to engage a cam or eccentric 24 mounted upon or driven by the shaft of the generatortheie'xcitation of which iscontrolled by the regulator. When the generator speed and voltageattain predetermined values the armature 11 is attracted and the, contact member 17 is raised slightly. The cam 01' eccentric 24 then serves to vibrate the contact member 18- into and out of engagement with the member 17 at a rate proportionate to and dependent upon the speed of the generator. The plate 9 is provided with a lug or car 25 to which theends of the coils the device being connected to ground, the

terminals of the coils and the contact member 17 are thus grounded.

The contact member 18 is connected to a suitable point in a resistor 26 a portion of which is .included in series with the shunt field magnet winding 27 of the generator and disengagement of the

contact members

17 and 18. The position of the contact member 17 depends upon the degree of excitation of the electromagnet produced by the coils 4 and 6 which are connected in opposition to each other. Thus, as the voltage of the generator increases, the contact member 17 is caused to recede from the terminal 18 so that the eflective value of the resistance in the field circuit will be somewhat increased .to efiect a reduction in the excitation of the field magnet winding and,'therefore, of the voltage of the generator. Likewise, as the current delivered by the generator increases, the current in the coil- 6 increases correspondingly. Since the magnetizing eifect of this coil is opposed to that of the coil 4, the pull upon the armature is somewhat decreased so as to permit of a reduction in the effective value of the resistance of the resistor 26, and, therefore, of an increase in the excitation of the field magnet winding which increases the voltage to enable the generator to carry the increased load without'substantial reduction in its voltage.

"As the generator temperature increases, due to its operation under load, the'increased temperature is communicated to the bimetallic plate spring 13 and, owing to the different rates of expansion of the two metalsv which compose it, the restraining force of the springupon the, armature is somewhat decreased in accordance with the increase in the temperature of the generator structure. The efiect of the decreased restraining force of the spring is to make it possible for a smaller current in the series coil 6 to cause an increase in the efiective value of the resistance in the field circuit sothat the generator will tend to carry less. load after it has become heated than when cool. The resistances of the regulator. coils 5 and 6 will also change with changes in temperature, and the bi-metallic spring 13 also operates to compensate for such changes. Similarly, the operation of the regulator will be effected by atmospheric temperature so that, when the weather is warm the regulator will cause the generator to deliver less current at a given speed than when the weather is cold.

The structure of the electromagnet may also be employed in other devices than regulators, such, for instance, as cut-out devices employed for controlling the connections of a generator to a battery that is adapted to be charged thereby when the voltage of the generator exceeds the voltage of. the battery.

. I claim as my invention:

1. A regulator for dynamo-electric machines comprising an electromagnet having an energizing winding, an armature therefor that ispivoted at one end, a plate spring attached to the armature and extending beyond its free end, a stop with which the said spring engages, a pair of cooperating contact members one of which is actuated by the armature, another plate spring on one end of which the other contact member is mounted and the other end of which is rigidly supported, and means for actuating the latter spring,

2. A regulator for dynamo-electric machines comprising an electromagnet having an energizing winding, an armature therefor that is pivoted at one.end,- a lei-metallic plate spring attached to the armature and 9 extending beyond its free end, a stop with which the said spring engages, a pair of cooperating contact members one of which is actuated by the armature, another plate spring on one end of which the other con- 9 tact member is mounted and the other end of which is rigidly supported, and means for actuating the latter spring. v 3. A regulator for dynamo-electric machines comprising an electromagnet having 1 an armature pivoted at one end, a plate spring attached to the armature and extending beyond its free end, a stop with which the said spring engages, a pair of cooperating contact members one of which is'actuated by the armature, another plate spring on one end of which the other contact member is'mounted and the other end of which is rigidly supported, a wear piece attached to the latter spring, and a cam that engages the said wear piece and is actuated by the dynamo-electric machine.

.4. A regulator for a dynamo-electric machine comprising a U-sh-aped magnetizable member, a central adjustable leg therefor, I

an energizing winding surrounding the saidcentral leg, an armature pivoted to one of the outer legs of the magnetizable member and extending adjacent to the central leg,

a plate spring attached to thearmature and 1 extending beyond its free end, a stop with which the said spring engages, .a pair'of cooperating contact members one ofwhich is actuated .by the armature, another ,plate spring upon one end of which the other conj tact member is mounted and the other end of which is rigidly supported, and a cam driven by the dynamo-electric machine for actuating the latter spring. 1

'5. A regulator for a dynamo-electric inaj chine comprising a U-shaped magnetizable member, an adjustable central leg therefor, an energizing winding surrounding the central leg, an armature that is pivoted to one of the outer legs of the magnetizable memher and extends adjacent to the central leg, two superposed plate springs one of which is bi-metallic,'at tached to the armature and extending beyond its free end, a stop with which the said springs engage, a pair of cooperating contact members one of which is actuated by the armature, another plate spring upon one end of which the other contact member is mounted and the other end of which is rigidly supported, and a cam driven by the dynamo-electric machine for actuating the latter spring.

6. A regulator for a dynamo-electric machine comprising a U-shaped magnetizable member, an adjustable central leg therefor, an energizing winding surrounding the central leg, a non-magnetizable plate attached to the ends of the legs of the magnetizable member, an armature that is pivoted to said plate and extends across the end of the said central leg, a bi-metallic plate spring attached to the armature and extending beyond its free end and engaging a portion of the said non-magnetizable plate, a pair of cooperatingcontact members one of which is actuated by the armature, another plate spring upon one end of which the other contact member is mounted and the other end of which is rigidly attached to but insulated from the non-magnetizable plate, and a cam driven by the dynamo-electric machine for actuating the latter spring.

7 An electromagnetic device comprising a U-shaped magnetizable member, a central adjustable core leg mounted in the said member, an energizing winding surrounding the said central leg, an armature pivoted to on of the outer legs of the magnetizable member and extending adjacent to the central leg, aplate spring attached to the armature and extending beyond its free end, a stop with which the said spring engages and a pair of cooperating contact members one of which is actuated by the armature.

8. An electromagnetic device comprising a U-shaped magnetizable member, a central longitudinal adjustable core leg mounted in the said member, an energizing winding surrounding the said central leg, a non-magnetizable plate attached to the ends of the legs of the magnetizable member, an armature that is pivoted to the said plate and extends adjacent the end of the said central leg, a plate spring attached to the armature and extending beyond its free end and engaging a portion of the said magnetizable plate, and a pair of cooperating contact members one of which is actuated by the armature.

In testimony whereof, I have hereunto subscribed my name this 30th day of Oct.,

JOHN B. DYER.