GB418979A - Improvements in and relating to electric tachometers - Google Patents
Improvements in and relating to electric tachometersInfo
- Publication number
- GB418979A GB418979A GB10083/33A GB1008333A GB418979A GB 418979 A GB418979 A GB 418979A GB 10083/33 A GB10083/33 A GB 10083/33A GB 1008333 A GB1008333 A GB 1008333A GB 418979 A GB418979 A GB 418979A
- Authority
- GB
- United Kingdom
- Prior art keywords
- magnetic
- disc
- windings
- carrying
- magnet
- 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
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P1/00—Details of instruments
- G01P1/04—Special adaptations of driving means
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Dynamo-Electric Clutches, Dynamo-Electric Brakes (AREA)
Abstract
418,979. Electric speedometers. BENDIX AVIATION CORPORATION, 105, West Adams Street, Chicago, U.S.A. April 4, 1933, No. 10083. Convention date, April 5, 1932. [Class 106 (iii).] A disc or vane forming the indicating member is rotated against a spring control by a magnetic field energized by polyphase current supplied from a generator driven by a member, the speed of which is to be observed. The generator, Figs. 1, 4 and 5, includes a rotor driven by multiplying gear 16 from the spindle 17 and consisting of a non-magnetic block 19 carrying bar magnets 22 and I-shaped compensators 34 made of metal the permeability of which varies with temperature differently from the magnet steel. Polyphase current, the frequency of which is proportional to the speed, is generated in stationary field windings 26 connected by three wires 13 to the indicator instrument 12, shown also in Figs. 8 and 10. A non-conducting casing 38 with a metal magnetic shield 39 encloses a pair of substantially rectangular laminated cores 44, 44<a> carrying windings 45 supplied with the polyphase current, the windings being energized to the saturation point to eliminate the effect of change of voltage so that the indicator is responsive to frequency only. A thin disc 49 preferably of aluminium is mounted within gaps 47, 48 in the core on a spindle 50 carrying a pointer 56 the magnetic drag being opposed by a hair spring 54<a>. The movements of the disc are damped by a permanent horse shoe magnet 58. The disc rotates between the poles of the magnet and the keeper 59. To compensate for permeability changes in the cores 44, 44<a> resulting from temperature changes, magnetic shunts 61 are supported by spacing sleeves 62 across the gaps of the magnetic circuit. Coils 63 of fine wire may be wound on the compensators.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US418979XA | 1932-04-05 | 1932-04-05 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB418979A true GB418979A (en) | 1934-11-05 |
Family
ID=21918935
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB10083/33A Expired GB418979A (en) | 1932-04-05 | 1933-04-04 | Improvements in and relating to electric tachometers |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB418979A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1231039B (en) * | 1959-12-08 | 1966-12-22 | Noris Tachometerwerk G M B H | Speed measuring device |
-
1933
- 1933-04-04 GB GB10083/33A patent/GB418979A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1231039B (en) * | 1959-12-08 | 1966-12-22 | Noris Tachometerwerk G M B H | Speed measuring device |
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