GB365139A - Improvements in and relating to electric measuring instruments - Google Patents
Improvements in and relating to electric measuring instrumentsInfo
- Publication number
- GB365139A GB365139A GB27405/30A GB2740530A GB365139A GB 365139 A GB365139 A GB 365139A GB 27405/30 A GB27405/30 A GB 27405/30A GB 2740530 A GB2740530 A GB 2740530A GB 365139 A GB365139 A GB 365139A
- Authority
- GB
- United Kingdom
- Prior art keywords
- flux
- path
- shunt
- sept
- alternating
- Prior art date
- 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.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R5/00—Instruments for converting a single current or a single voltage into a mechanical displacement
- G01R5/14—Moving-iron instruments
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Reciprocating, Oscillating Or Vibrating Motors (AREA)
Abstract
365,139. Current and pressure meters. BRITISH THOMSON-HOUSTON CO., Ltd., Crown House, Aldwych, London.-(Assignees of St. Clair, B. W. ; 18, Verona Street, Lynn, Massachusetts, U.S.A.) Sept. 13, 1930, No. 27405. Convention date, Sept. 13, 1929. [Class 37.] An alternating-current ammeter or voltmeter is compensated for frequency variations by providing the polepiece structure with a shunt path for the magnetic flux in parallel with the main flux path, the shunt path having an air-gap and being surrounded by a shortcircuited coil. As shown, an alternating- current ammeter of the moving-vane type has auxiliary polepieces 14, 15 provided with short-circuited coils 16, the arrangement being such that as the frequency increases the total flux decreases but the torque-producing flux is increased owing to the increased reluctance of the shunt flux path. Damping is effected by a vane 27 movable across symmetrically disposed poles 25 of a permanent magnet.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US365139XA | 1929-09-13 | 1929-09-13 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB365139A true GB365139A (en) | 1932-01-13 |
Family
ID=21889003
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB27405/30A Expired GB365139A (en) | 1929-09-13 | 1930-09-13 | Improvements in and relating to electric measuring instruments |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB365139A (en) |
-
1930
- 1930-09-13 GB GB27405/30A patent/GB365139A/en not_active Expired
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