GB1164270A - Apparatus for Electrical Measurement of the Speed of Rotation of a Machine. - Google Patents
Apparatus for Electrical Measurement of the Speed of Rotation of a Machine.Info
- Publication number
- GB1164270A GB1164270A GB5643666A GB5643666A GB1164270A GB 1164270 A GB1164270 A GB 1164270A GB 5643666 A GB5643666 A GB 5643666A GB 5643666 A GB5643666 A GB 5643666A GB 1164270 A GB1164270 A GB 1164270A
- Authority
- GB
- United Kingdom
- Prior art keywords
- rotor
- frequency
- machine
- stator
- voltage
- 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
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/42—Devices characterised by the use of electric or magnetic means
- G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
- G01P3/48—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/42—Devices characterised by the use of electric or magnetic means
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Tests Of Circuit Breakers, Generators, And Electric Motors (AREA)
- Synchronous Machinery (AREA)
Abstract
1,164,270. Measuring rotational speed, electrically. BROWN BOVERI & CO. Ltd. Dec. 16, 1966 [Dec,18, 1965], No. 56436/66. Heading G1N. An apparatus for the measurement or control of the speed of a rotary asynchronous machine Fig. 1 produces an alternating output voltage having speed-dependent frequency and speed independent constant amplitude. The apparatus comprises an A. C. generator 2, coupled to a shaft of the machine 1, and having separately excited rotor 3 fed through slip rings 5 from an A. C. source 6 with a square waveform voltage a Fig. 2 of constant amplitude at a frequency f h , which is relatively high compared with the rotational frequency of the rotor 3 and machine 1, and a three phase armature 4 which is stationary, or in an alternative embodiment Fig. 3 (not shown) may be rotated by a separate drive. The rotor field induces in the stator sinusoidally modulated A.C. voltages b Fig. 2 where the envelope frequency is proportional to rotor speed na. Demodulator means are provided for removing from the armature output voltage the component at frequency f h to produce a constant amplitude signal at the rotational frequency. The rate of change of flux produced in the stator windings by the rotor rotation is small compared with the rate of change of flux due to the alternating voltage from source 6 and hence the voltage amplitude of the stator output is substantially constant. In an alternative embodiment Figs. 4 and 5 (not shown) the generator 2 has a stationary three phase stator and a three phase rotor, and the rotor is energized by an auxiliary A. C. source the output waveforms each phase of which are similar to that shown in Fig. 2, that is a square wave voltage at f h modulated by a low frequency voltage. In a further arrangement, Fig. 3 (not shown), the stator is driven by a synchronous machine (9) while the rotor is driven by an asynchronous machine(1) connected to the same three phase source as machine (9). If the stator is driven in the same direction as the rotor than the filter unit (7) produces an output at the slip frequency of the asynchronous machine.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE1965B0085037 DE1266548B (en) | 1965-12-18 | 1965-12-18 | Device for electrical measurement of the speed of machines |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1164270A true GB1164270A (en) | 1969-09-17 |
Family
ID=6982727
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB5643666A Expired GB1164270A (en) | 1965-12-18 | 1966-12-16 | Apparatus for Electrical Measurement of the Speed of Rotation of a Machine. |
Country Status (5)
| Country | Link |
|---|---|
| CH (1) | CH456998A (en) |
| DE (1) | DE1266548B (en) |
| FR (1) | FR1505739A (en) |
| GB (1) | GB1164270A (en) |
| SE (1) | SE303543B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9198156B2 (en) | 2004-08-23 | 2015-11-24 | Telefonaktiebolaget L M Ericsson (Publ) | Paging mobile stations in a hybrid network |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE357530C (en) * | 1919-05-18 | 1922-08-21 | Siemens Schuckertwerke G M B H | Device for measuring the speed of machines by electrical means |
| BE521713A (en) * | 1952-08-02 | |||
| DE1015245B (en) * | 1956-03-26 | 1957-09-05 | Licentia Gmbh | Procedure for measuring and displaying small speeds |
-
1965
- 1965-12-18 DE DE1965B0085037 patent/DE1266548B/en active Pending
-
1966
- 1966-12-16 FR FR87704A patent/FR1505739A/en not_active Expired
- 1966-12-16 GB GB5643666A patent/GB1164270A/en not_active Expired
- 1966-12-16 SE SE1730266A patent/SE303543B/xx unknown
- 1966-12-16 CH CH1809266A patent/CH456998A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| DE1266548B (en) | 1968-04-18 |
| SE303543B (en) | 1968-09-02 |
| CH456998A (en) | 1968-05-31 |
| FR1505739A (en) | 1967-12-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PLNP | Patent lapsed through nonpayment of renewal fees |