GB1228004A - - Google Patents
Info
- Publication number
- GB1228004A GB1228004A GB1228004DA GB1228004A GB 1228004 A GB1228004 A GB 1228004A GB 1228004D A GB1228004D A GB 1228004DA GB 1228004 A GB1228004 A GB 1228004A
- Authority
- GB
- United Kingdom
- Prior art keywords
- signal
- network
- capacitor
- frequency
- varied
- 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
- 239000003990 capacitor Substances 0.000 abstract 4
- 230000010355 oscillation Effects 0.000 abstract 2
- 230000005294 ferromagnetic effect Effects 0.000 abstract 1
- 230000001939 inductive effect Effects 0.000 abstract 1
- 238000005339 levitation Methods 0.000 abstract 1
- 238000012986 modification Methods 0.000 abstract 1
- 230000004048 modification Effects 0.000 abstract 1
- 230000000087 stabilizing effect Effects 0.000 abstract 1
- 230000003068 static effect Effects 0.000 abstract 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C32/00—Bearings not otherwise provided for
- F16C32/04—Bearings not otherwise provided for using magnetic or electric supporting means
- F16C32/0406—Magnetic bearings
- F16C32/044—Active magnetic bearings
- F16C32/0444—Details of devices to control the actuation of the electromagnets
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F7/00—Magnets
- H01F7/06—Electromagnets; Actuators including electromagnets
- H01F7/08—Electromagnets; Actuators including electromagnets with armatures
- H01F7/18—Circuit arrangements for obtaining desired operating characteristics, e.g. for slow operation, for sequential energisation of windings, for high-speed energisation of windings
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F7/00—Magnets
- H01F7/06—Electromagnets; Actuators including electromagnets
- H01F7/20—Electromagnets; Actuators including electromagnets without armatures
- H01F7/206—Electromagnets for lifting, handling or transporting of magnetic pieces or material
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Mechanical Engineering (AREA)
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
- Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
Abstract
1,228,004. Levitation apparatus. NATIONAL RESEARCH DEVELOPMENT CORP. 27 Aug., 1969 [27 May, 1968], No. 25265/68. Addition to 1,165,704. Heading H2A. [Also in Division G3] In a system as described in Specification 1,165,704 a subsidiary, stabilizing circuit is provided to damp out undesired oscillations. The energizing coil 13 of electromagnet 11 and capacitor 14 are arranged to be sufficiently removed from resonance of the A.C. frequency that ferro-magnetic load 12 is stabilized at a predetermined distance from the magnet. Due to the slow response of the system, oscillations may occur and these are damped out by deriving a signal from current transformer 17 and either using the signal directly or after phase advance in network 19 to modulate the carrier 21, which may be at the mains frequency. Alternatively, the frequency of the A.C. supplied to 13, 14 may be varied by applying the signal from network 19 to a signal generator (22), Fig. 6 (not shown), feeding a variable frequency static inverter (15). In a further modification, Fig. 7 (not shown), the signal from network 19 controls a series of Schmitt triggers (29) which switch further capacitors (26) across capacitor 14. The effective inductive reactance in the circuit may be varied, Fig. 8 (not shown), by employing a saturable reactor (32) in series with capacitor 14, the reactor being controlled by a D.C. amplifier (33) fed with the signal from network 19.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2526568 | 1968-05-27 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1228004A true GB1228004A (en) | 1971-04-15 |
Family
ID=10224911
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1228004D Expired GB1228004A (en) | 1968-05-27 | 1968-05-27 |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1228004A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3638093A (en) * | 1971-04-19 | 1972-01-25 | Rohr Corp | Magnetic suspension and propulsion system |
| FR2370661A1 (en) * | 1976-11-16 | 1978-06-09 | Goeppinger Magnetfabrik | TRANSPORT FACILITY |
| EP1439012A1 (en) * | 1997-09-24 | 2004-07-21 | Mitsubishi Heavy Industries, Ltd. | Automatic plate bending system using high frequency induction heating |
| EP1594211A3 (en) * | 2004-05-06 | 2006-01-11 | ROLLS-ROYCE plc | Electromagnetic bearing with two power sources having distinct voltage; Demagnetising permanent magnets upon failure in an electrical machine |
-
1968
- 1968-05-27 GB GB1228004D patent/GB1228004A/en not_active Expired
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3638093A (en) * | 1971-04-19 | 1972-01-25 | Rohr Corp | Magnetic suspension and propulsion system |
| DE2219154A1 (en) * | 1971-04-19 | 1972-11-09 | Rohr Corp., Chula Vista, Calif. (V.StA.) | Magnetic levitation and drive device |
| FR2370661A1 (en) * | 1976-11-16 | 1978-06-09 | Goeppinger Magnetfabrik | TRANSPORT FACILITY |
| EP1439012A1 (en) * | 1997-09-24 | 2004-07-21 | Mitsubishi Heavy Industries, Ltd. | Automatic plate bending system using high frequency induction heating |
| EP1594211A3 (en) * | 2004-05-06 | 2006-01-11 | ROLLS-ROYCE plc | Electromagnetic bearing with two power sources having distinct voltage; Demagnetising permanent magnets upon failure in an electrical machine |
| US7138739B2 (en) | 2004-05-06 | 2006-11-21 | Rolls-Royce Plc | Magnetic bearing |
| US7215054B2 (en) | 2004-05-06 | 2007-05-08 | Rolls-Royce Plc | Magnetic bearing |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PE | Patent expired |