US1789031A

US1789031A - Quick-acting regulator of the vibrating type

Info

Publication number: US1789031A
Application number: US359980A
Authority: US
Inventors: Meyer-Berg Huldreich; Keller Robert
Original assignee: BBC Brown Boveri France SA
Current assignee: BBC Brown Boveri AG Germany; BBC Brown Boveri France SA
Priority date: 1928-05-24
Filing date: 1929-05-02
Publication date: 1931-01-13
Anticipated expiration: 1948-01-13
Also published as: US1822232A

Description

Jan. 13, 1931. H. MEYER-BERG ET AL 3 'QUICK ACTING REGULATOR OF THE VIBRATING TYPE Original Filed May 24, 1928 IN vew Tali Patented Jan. 13, 1931 UNITED STATES PATENT OFFICE HULDREICH MEYER-BERG,

OF BADEN, AND ROBERT KELLER,

O1 ENNETBADEN- BAIDEN, SWITZERLAND QUICK-ACTING REGULATOR THE VIBRATING TYPE Original application filed Kay 24, 1928, Serial 110. 280,287, and in Germany June 1, 1997. Divided and this application filed Kay 2, 1929. Serial No. 359,980.

lator is, that the trembler contacts are subjcct to rapid destruction, owing to their bcin excessively stressed. This is due to the f act that, when the contacts are being opened, there is too great a difference in voltage between the contacts. This difference in voltage is due to the rigid resistance connected up parallel to the trembler contacts. Consequently, each time the contacts are opened an arc is formed, the intensity of which depends on the strength of the excitation current and the drop in voltage. Although by using a resistance having a number of steps the formin of sparks by the contacts is diminished, it is still far too reat when a considerable excitation current ows,

so that in this case as well the life of the vibrating contacts is veryshort. In the case of the carbon compression type regulator, the disadvanta es make themselves felt in this way, that t e ohmic resistance of the carbon column is not constant, but is subject to considerable variations in the course of time according to the structure of the carbon. This interferes seriously with the fine regulation, so that the carbon compression regulator can only be made use of in cases where no very accurate regulation is required.

The present invention has for its object to provide a quick-acting regulator in which 0 the advantages of the mechanical simplicity of the vibrating regulator and of the carbon com ression regulator are fully realized, whil e the electrical disadvantages of the same are avoided. According to the inven- 5 tion a regulable non-inductive resistance is connected up in parallel to the vibrating or tremble contact of a re lator, which resistance can be adjusted tween a minimum and a maximum value. As the re lable resistance a carbon compression IGgLLElZOI is v woul preferably used, which by coacting with the vibrating contact allows of a fine regulation in direct dependence on the excitation of the generator.

In the constructional example shown in our prior application Serial No. 280 287, from which t e present application has een divided out, the vibrating contact and the carbon compression regulator are jointly controlled by the armature of a single electromagnet, but according to the present invention the two may be controlled independently of one another by separate electromagnetic means.

In the constructional example described in our copending application Serial No.

280,287, the vibrating re ulator is mechanically rigidly coupled to t e carbon compression regulator, so that the two are synchronously controlled in dependence on the magnitude of the excitation current of the generator. According to the present invention, instead of the two regulators being mechanically coupled the carbon compression regulator is independently controlled bg electromagnetic means in dependence on t e excitation current of the generator flowing over the vibratin contacts, so that the metallic contacts of t e vibrating regulator are relieved. The invention may be carried into effect as shown in the accompanying drawin wherein a is the generator and b the excitation windin of the same. r is the regulator rovided with an interrupter coil. 0, 0 are t e vibrating contacts lying in the excitation circuit.. In parallel with the vibrating contacts is-the carbon com ression regulator d, the resistance value 0 which is re lated by the pressure of the armature t Wl'llCh is acted on by the electromagnet 8.

Thus, should the entire excitation current flow over the vibrating contacts, the electromagnet s will be strongly energized and the armature t will exert a great pressure on the carbon column of the carbon compression regulator, the resistance value of the latter being consequently reduced. The volta e at the terminals of the generator consequently rise. The vibrating regulator, however, immediately offers a greater are resistance, so that through a correspondin diminution in the attractive force of t e electromagnet the ressure of the armature t on the carbon co umn is reexcitation current duced, and the resistance value of the carbon compression regulator thereby increased. This cycle of operations is re- I in dependence on the owing over the vibrating contacts, so that the vibrating contacts are relieved by the parallel connected carbon compression regulator.

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

1. A quick acting regulator of the vibrating contact type including a pair of vibrating contacts in series with the magnitude to be regulated, an electromagnet for vibrating said contacts, a non-inductive resistance shunted across said vibrating contacts, and a second electromagnet arranged to vary said non-inductive resistance from a minimum to a maximum value in dependence upon the current flowing through the vibrating contacts.

2. A regulator as claimed in claim 1 peated automaticall wherein the said non-inductive resistance is of the compressible carbon In testimony whereof we names to this specification.

HULDREICH MEYER-BERG. ROBERT KELLER.

plla-te type.

ave signed our