US3398302A - Electrical impulse generator - Google Patents

Electrical impulse generator Download PDF

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Publication number
US3398302A
US3398302A US495605A US49560565A US3398302A US 3398302 A US3398302 A US 3398302A US 495605 A US495605 A US 495605A US 49560565 A US49560565 A US 49560565A US 3398302 A US3398302 A US 3398302A
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Prior art keywords
armature
energy store
electrical impulse
impulse generator
housing
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Expired - Lifetime
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US495605A
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Harnau Hans-Dieter
Backstein Gunter
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Essex Wire Corp
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Essex Wire Corp
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K39/00—Generators specially adapted for producing a desired non-sinusoidal waveform

Definitions

  • the invention relates to an electrical impulse generator, in particular for igniting the propellant or explosive charge in a projectile, in which on movement of an armature by means of an energy store a permanent-magnet circuit is opened and an electrical impulse is produced in an induction coil, and which has an actuating member in the form of a cap engaged over the front end of the housing of the electrical impulse generator.
  • An example of such a generator is found in British patent specification No. 913,896.
  • the present invention concerns a further improvement to an electrical impulse generator of that form in which, by simplification of the construction, easier and thus more economic manufacture is made possible together with greater reliability of operation.
  • An electrical impulse generator is characterised by the fact that the energy store is arranged within the cap-like actuating member and acts by way of a plunger on the armature, which consists, in a known manner, of a cylindrical piston.
  • This construction allows the generator to be assembled from turned and moulded parts which are comparatively simple and cheap to produce, thus rendering manufacture particularly economic.
  • means stop, pins or similar
  • the actuating member ensures the discharge of the energy store and thus the opening of the permanent magnet circuit by mechanical means. An electrical impulse is even produced with certainty, therefore, if the energy store should fail, as is quite possible.
  • the housing 1 of the electrical pulse generator consists substantially of a tube into which a thread is cut at both ends in order to fix the individual components of the electrical impulse generator.
  • an annular permanent magnet 2 Inside the housing 1 is arranged an annular permanent magnet 2, with its pole surface in contact with soft iron pole plates 3 and 4.
  • Inside the annular magnet 2 is situated an induction coil 5 wound on a former 6 made of non-magnetic material.
  • the upper pole plate 3 has a tubular extension 3a which projects into the former 6 for about half the length of the latter.
  • an armature 7 in the form of a cylindrical piston is arranged so that it is longitudinally displacea ble and fits with its end face against the annular surface of the extension 311 of the pole plate 3 forming a surface 21.
  • the lower pole plate 4 has a tubular extension 4a which projects into the space formed by the distance piece 10 and serves to guide the armature 7.
  • the housing 1 is closed, at its upper end, by a caplike actuating member 11 which consists of a pressure plate 11a, which is guided on the housing 1 by means of a tubular extension 11b of the plate. Movement of member 11 which is described later is helped by two circlips 12 fitted externally on the housing 1. A further circlip 13 is positioned on the lower end of the tubular section 11b and prevents the cap being lifted off the housing. A recess 14 is provided on the housing 1 to enable this circlip to be fitted.
  • a plunger 15 made of non-magnetic material, and guided for movement by the extension 3a of the pole plate 3.
  • the plunger 15 rests on the armature 7.
  • the plunger carries a spring disc 16 between which and the pressure plate 11a is arranged an energy store in the form of a spiral spring 17.
  • a further spiral spring 18 serving as a return spring is compressed between the annular disc 8 and the pressure plate 11a.
  • the return spring 18 also guides the actuating member 11 back into its rest position. In this way, electrical impulses of constant strength are produced in quick succession.
  • a buffer cap 20 made of resilient material and supported against a buffer spring 19 is provided in the space provided by the distance piece 10. The armature which is accelerating downwards after pulling away from the gap surface 21 is thereby brought resiliently to rest.
  • the buffer spring 19 and buffer cap 20 are covered over by a plastic tube 22 which separates them from the surrounding space 23 which contains the leads to and from the induction coil and is also filled with an insulating and sealing mass.
  • a buffer disc 24 is provided which is held by the annular disc 8.
  • a further spring 25 initiates and ensures the return of the spring disc 16 with plunger 15.
  • the spring 25 is supported against the upper pole plate 3 and is dimensioned so that its pre-loading is equal to or slightly less than that of the energy store spring 17. This also ensures that the plunger, in the rest position, fits on the armature 7 without loading it by means of the pre-loading of the energy store spring 17.
  • pin 26 does not normally meet the spring disc when the electrical impulse generator is actuated as described previously.
  • the compression spring 17 acting as an energy store is for this purpose so dimensioned that the travel of the spring until the holding force of the magnet is [reached is less than the distance between the pin 26 and the spring disc 16.
  • An electrical impulse generator comprising in combination a housing containing a normally-closed magnetic circuit, an induction coil located within the magnetic circuit, a movable armature forming part of said magnetic circuit, an actuating cap fitted over said housing and movable relatively to said armature, an energy store located in the actuating cap and operable on movement of said actuating cap and an actuating plunger linking said energy store to said armature whereby initial movement of the actuating cap first stores energy in said energy store until the force existing between the actuating cap and the anmature is equal to the magnetic force between the armature and the magnetic circuit when further movement of the actuating cap separates the armature from the magnetic circuit, the energy stored in said energy store serving to accelerate the armature away from the magnetic circuit, and a return device for the actuating cap located within the latte-r.
  • An electrical impulse generator comprising in combination a housing containing a normally-closed magnetic circuit, an induction coil located within the magnetic circuit, a movable armature forming part of said magnetic circuit, an actuating cap fitted over said housing and movable relatively to said armature, an energy store located in the actuating cap and operable on movement of said actuating cap and an actuating plunger linking said .energy store to said armature whereby initial movement of the actuating cap first stores energy in said energy store until the force existing between the actuating cap and the armature is equal to the magnetic force between the armature and the magnetic circuit when further movement of the actuating cap separates the armature from the magnetic circuit, the energy stored in said energy store serving to accelerate the armature away from the magnetic circuit, and a projection on said actuating cap, which ensures release of energy stored in said energy store and mechanical separation of said armature and said magnetic circuit.
  • An electrical impulse generator comprising in combination a housing containing a normally-closed magnetic circuit, an induction coil located within the magnetic circuit, a movable armature forming part of said magnetic circuit, an actuating cap fitted over said housing and movable relatively to said armature, an energy store located in the actuating cap and operable on movement of said actuating cap and an actuating plunger linking said energy store to said armature whereby initial movement of the actuating cap first stores energy in said energy store until the force existing between the actuating cap and the armature is equal to the magnetic force between the armature and the magnetic circuit when further movement of the actuating cap separates the armature from the magnetic circuit, the energy stored in said energy store serving to accelerate the armature away from the magnetic circuit, and resilient means acting on said armature in a sense opposite to that in which said energy store acts on said armature to relieve the latter, when in its initial position, of the etfect of the energy store.

Description

O -l 4 SR bLHKbH nuuw:
FIP85U2 OR 3398302 Aug. 20, 1968 HANS-DIETER HARNAU ET AL 3,3
ELECTRICAL IMPULSE GENERATOR Filed Oct. 13, 1965 Inventors Q DLE%I- Hamau 5y VZZEf- Buckskin United States Patent 3,398,302 ELECTRICAL IMPULSE GENERATOR Hans-Dieter Harnau, Gevelsberg, and Giinter Backstein,
Hattingen (Ruhr), Germany, assignors to Essex Wire Corporation, Fort Wayne, Ind., a corporation of Michigan Filed Oct. 13, 1965, Ser. No. 495,605 Claims priority, application Germany, Oct. 13, 1964,
38,996 3 Claims. (Cl. 31014) ABSTRACT OF THE DISCLOSURE An electrical impulse generator in which a housing contains a magnetic support together with an induction coil in the support with a movable armature. An actuating cap fits over the housing and is moveable relative to the armature and an energy store is located in the cap.
The invention relates to an electrical impulse generator, in particular for igniting the propellant or explosive charge in a projectile, in which on movement of an armature by means of an energy store a permanent-magnet circuit is opened and an electrical impulse is produced in an induction coil, and which has an actuating member in the form of a cap engaged over the front end of the housing of the electrical impulse generator. An example of such a generator is found in British patent specification No. 913,896.
The present invention concerns a further improvement to an electrical impulse generator of that form in which, by simplification of the construction, easier and thus more economic manufacture is made possible together with greater reliability of operation.
An electrical impulse generator according to the present invention is characterised by the fact that the energy store is arranged within the cap-like actuating member and acts by way of a plunger on the armature, which consists, in a known manner, of a cylindrical piston. This construction allows the generator to be assembled from turned and moulded parts which are comparatively simple and cheap to produce, thus rendering manufacture particularly economic.
As a subsidiary feature of the invention, means (stop, pins or similar) are provided on the actuating member, which in the end position of the actuating member ensure the discharge of the energy store and thus the opening of the permanent magnet circuit by mechanical means. An electrical impulse is even produced with certainty, therefore, if the energy store should fail, as is quite possible.
By way of example only, an embodiment of the invention will now be described in greater detail with reference to the accompanying single figure of the drawing which is in section through the embodiment.
The housing 1 of the electrical pulse generator consists substantially of a tube into which a thread is cut at both ends in order to fix the individual components of the electrical impulse generator. Inside the housing 1 is arranged an annular permanent magnet 2, with its pole surface in contact with soft iron pole plates 3 and 4. Inside the annular magnet 2 is situated an induction coil 5 wound on a former 6 made of non-magnetic material. The upper pole plate 3 has a tubular extension 3a which projects into the former 6 for about half the length of the latter. In the free space in the former an armature 7 in the form of a cylindrical piston is arranged so that it is longitudinally displacea ble and fits with its end face against the annular surface of the extension 311 of the pole plate 3 forming a surface 21. The pole plates 3 and 4and thus the annular magnet 2 and the induction coil 7 3,398,302 Patented Aug. 20, 1968 "ice 5are held in the housing 1 between an annular disc 8 screwed into the housing and a distance piece 10 held in place by a cover disc 9 also screwed into the housing. The lower pole plate 4 has a tubular extension 4a which projects into the space formed by the distance piece 10 and serves to guide the armature 7.
The housing 1 is closed, at its upper end, by a caplike actuating member 11 which consists of a pressure plate 11a, which is guided on the housing 1 by means of a tubular extension 11b of the plate. Movement of member 11 which is described later is helped by two circlips 12 fitted externally on the housing 1. A further circlip 13 is positioned on the lower end of the tubular section 11b and prevents the cap being lifted off the housing. A recess 14 is provided on the housing 1 to enable this circlip to be fitted.
Into the free space between the upper annular disc 8 and the pressure plate 11a projects a plunger 15 made of non-magnetic material, and guided for movement by the extension 3a of the pole plate 3. The plunger 15 rests on the armature 7. At its upper end, the plunger carries a spring disc 16 between which and the pressure plate 11a is arranged an energy store in the form of a spiral spring 17. In addition, a further spiral spring 18 serving as a return spring is compressed between the annular disc 8 and the pressure plate 11a.
When the actuating member 11 is depressed, the force of the spiral spring 17 acts, by way of the plunger 15, on the armature 7 and the spiral spring 17 is compressed until the force stored in the spring exceeds the magnetic holding force of the armature 7 at the annular surface 21 of the extension 3a, whereupon the armature pulls away. The intensity of the magnetic flux is suddenly altered by the resulting air gap and an electric impulse is induced in the induction coil 5. The armature accele- -rates downward, to return again quickly into its initial position, so that the plunger 15 with spring disc 16 is also returned to its initial position.
The return spring 18 also guides the actuating member 11 back into its rest position. In this way, electrical impulses of constant strength are produced in quick succession.
In order to protect the housing, during operation of the electrical impulse generator, from hard knocks and jolts, which might lead to damage and distortion of the armature, a buffer cap 20 made of resilient material and supported against a buffer spring 19 is provided in the space provided by the distance piece 10. The armature which is accelerating downwards after pulling away from the gap surface 21 is thereby brought resiliently to rest.
The buffer spring 19 and buffer cap 20 are covered over by a plastic tube 22 which separates them from the surrounding space 23 which contains the leads to and from the induction coil and is also filled with an insulating and sealing mass. In addition, for the resilient stopping of the spring disc 16, a buffer disc 24 is provided which is held by the annular disc 8. A further spring 25 initiates and ensures the return of the spring disc 16 with plunger 15. The spring 25 is supported against the upper pole plate 3 and is dimensioned so that its pre-loading is equal to or slightly less than that of the energy store spring 17. This also ensures that the plunger, in the rest position, fits on the armature 7 without loading it by means of the pre-loading of the energy store spring 17.
Almost complete reliability of operation of the electrical impulse generator just described is achieved in the event of failure of the energy store spring 17 due to weakening or breakage. In that event, when the pressure plate is actuated, a pin 26 provided on the latter meets the spring disc 16, thereby pushing the armature away from the gap surface 21 by way of the plunger 15. The
pin 26 does not normally meet the spring disc when the electrical impulse generator is actuated as described previously. The compression spring 17 acting as an energy store is for this purpose so dimensioned that the travel of the spring until the holding force of the magnet is [reached is less than the distance between the pin 26 and the spring disc 16.
We claim:
1. An electrical impulse generator comprising in combination a housing containing a normally-closed magnetic circuit, an induction coil located within the magnetic circuit, a movable armature forming part of said magnetic circuit, an actuating cap fitted over said housing and movable relatively to said armature, an energy store located in the actuating cap and operable on movement of said actuating cap and an actuating plunger linking said energy store to said armature whereby initial movement of the actuating cap first stores energy in said energy store until the force existing between the actuating cap and the anmature is equal to the magnetic force between the armature and the magnetic circuit when further movement of the actuating cap separates the armature from the magnetic circuit, the energy stored in said energy store serving to accelerate the armature away from the magnetic circuit, and a return device for the actuating cap located within the latte-r.
2. An electrical impulse generator comprising in combination a housing containing a normally-closed magnetic circuit, an induction coil located within the magnetic circuit, a movable armature forming part of said magnetic circuit, an actuating cap fitted over said housing and movable relatively to said armature, an energy store located in the actuating cap and operable on movement of said actuating cap and an actuating plunger linking said .energy store to said armature whereby initial movement of the actuating cap first stores energy in said energy store until the force existing between the actuating cap and the armature is equal to the magnetic force between the armature and the magnetic circuit when further movement of the actuating cap separates the armature from the magnetic circuit, the energy stored in said energy store serving to accelerate the armature away from the magnetic circuit, and a projection on said actuating cap, which ensures release of energy stored in said energy store and mechanical separation of said armature and said magnetic circuit.
3. An electrical impulse generator comprising in combination a housing containing a normally-closed magnetic circuit, an induction coil located within the magnetic circuit, a movable armature forming part of said magnetic circuit, an actuating cap fitted over said housing and movable relatively to said armature, an energy store located in the actuating cap and operable on movement of said actuating cap and an actuating plunger linking said energy store to said armature whereby initial movement of the actuating cap first stores energy in said energy store until the force existing between the actuating cap and the armature is equal to the magnetic force between the armature and the magnetic circuit when further movement of the actuating cap separates the armature from the magnetic circuit, the energy stored in said energy store serving to accelerate the armature away from the magnetic circuit, and resilient means acting on said armature in a sense opposite to that in which said energy store acts on said armature to relieve the latter, when in its initial position, of the etfect of the energy store.
References Cited UNITED STATES PATENTS 3,035,520 2/1962 Koeppen 310-12 3,116,428 12/1963 Blodgett et a1. 310--15 3,130,332 4/1964 Zehfeld et a1. 310-15 3,132,268 5/1964 Abel et a1. 31015 3,153,735 10/1964 Branagan et al. 310-15 3,259,769 7/1966 Stoltt 31014 MILTON O. HIRSHFIELD, Primary Examiner.
D. F. DUGGAN, Assistant Examiner.
UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. 3 398 302 August 20 i968 Hans-Dieter Harnau et a1.
It is certified that error appears in the above identified patent and that said Letters Patent are hereby corrected as shown below:
In the heading to the printed specification, lines 4 to 6, "assignors Fort Wayne, Ind. a corporation of Michigan" to Essex Wire Corporation,
Dusseldorf Germany should read assignors to Firma Rheinmetall G.m.b.H.
(SEAL) Attest:
WILLIAM E. SCHUYLER, JR.
Commissioner of Patents Edward M. Fletcher, Jr.
Attesting Officer
US495605A 1964-10-13 1965-10-13 Electrical impulse generator Expired - Lifetime US3398302A (en)

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DER38996A DE1263174B (en) 1964-10-13 1964-10-13 Impulse generator

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DE (1) DE1263174B (en)
GB (1) GB1067887A (en)
NL (1) NL6513274A (en)

Cited By (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3500086A (en) * 1966-02-05 1970-03-10 Max Baermann Magneto - electric pulse generator especially for igniting gas-operated devices
US3693033A (en) * 1971-06-24 1972-09-19 Electromechanisms Inc Key operated pulse generating device
US3718828A (en) * 1971-08-11 1973-02-27 Guardian Electric Mfg Co Push button pulse signal generator
US3766399A (en) * 1972-10-19 1973-10-16 M Demetrescu Combustion engine driven generator including spring structure for oscillating the inductor at the mechanical resonant frequency between power strokes
US3772669A (en) * 1972-07-14 1973-11-13 Westinghouse Electric Corp Magnetic pulse generator
US3774058A (en) * 1972-06-30 1973-11-20 Permawick Co Force transducer
US3781836A (en) * 1972-07-14 1973-12-25 Westinghouse Electric Corp Self-powered wireless intrusion alarm system
US3855488A (en) * 1972-03-31 1974-12-17 Guardian Electric Mfg Co Push button pulse signal generator
US3937992A (en) * 1974-11-18 1976-02-10 Stackpole Carbon Company Pulse keyboard switch
US3984707A (en) * 1973-07-13 1976-10-05 Mcclintock Richard D Spring return linear signal generator
US4574323A (en) * 1981-10-20 1986-03-04 Kabushiki Kaisha Suwa Seikosha Flexible magnetic disk drive
US5038061A (en) * 1990-05-25 1991-08-06 Olsen John H Linear actuator/motor
US20050035600A1 (en) * 2001-05-22 2005-02-17 Andre Albsmeier Inductive voltage generator
US20050230974A1 (en) * 2004-04-15 2005-10-20 Brett Masters Vibration based power generator
US20050230973A1 (en) * 2004-04-15 2005-10-20 Fripp Michael L Vibration based power generator
US20060175052A1 (en) * 2005-02-08 2006-08-10 Tips Timothy R Flow regulator for use in a subterranean well
US20060175838A1 (en) * 2005-02-08 2006-08-10 Tips Timothy R Downhole electrical power generator
US20060266513A1 (en) * 2005-05-31 2006-11-30 Welldynamics, Inc. Downhole ram pump
US20070034385A1 (en) * 2005-08-15 2007-02-15 Tips Timothy R Pulse width modulated downhole flow control
US20070158945A1 (en) * 2006-01-06 2007-07-12 Aerodyne Research, Inc. System and method for controlling a power generating system
US20070158947A1 (en) * 2006-01-06 2007-07-12 Annen Kurt D System and method for controlling a power generating system
US20070158946A1 (en) * 2006-01-06 2007-07-12 Annen Kurt D Power generating system
US20110030483A1 (en) * 2009-08-07 2011-02-10 Halliburton Energy Services, Inc. Annulus vortex flowmeter
WO2016186797A1 (en) * 2015-05-19 2016-11-24 Deak David Sr Hollow magnetic metal core pulse energy harvesting generator
US9574556B1 (en) 2008-11-20 2017-02-21 Aerodyne Research, Inc. Free piston pump and miniature internal combustion engine
US9923443B2 (en) 2014-06-07 2018-03-20 David Deak, SR. Hollow magnetic metal core pulse energy harvesting generator
US10581355B1 (en) * 2015-12-18 2020-03-03 United States Of America As Represented By The Administrator Of National Aeronautics And Space Administration Double-fed induction linear oscillating alternator
US11251007B2 (en) 2017-10-30 2022-02-15 Wepower Technologies Llc Magnetic momentum transfer generator
US11837936B2 (en) * 2012-05-22 2023-12-05 Minebea Mitsumi, Inc. Vibrator generator having swing unit, frame and elastic member
USRE49840E1 (en) 2012-04-06 2024-02-13 Wepower Technologies Llc Electrical generator with rotational gaussian surface magnet and stationary coil

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US3035520A (en) * 1955-01-24 1962-05-22 Robert E Koeppen Inertia actuated electric unit
US3116428A (en) * 1961-10-16 1963-12-31 Space Equipment Corp Force responsive electrical impulse generator
US3130332A (en) * 1959-03-19 1964-04-21 Rheinmetall Gmbh Electric impulse generator for the detonation of charges
US3132268A (en) * 1962-03-05 1964-05-05 Force Controls Company Motion e.m.f. generating transducer
US3153735A (en) * 1959-12-14 1964-10-20 Edward F Branagan Inertia electro-magnetic generator
US3259769A (en) * 1964-01-30 1966-07-05 Albert M Stott Electrical pulse generator

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DE897876C (en) * 1944-12-19 1953-11-26 Max Baermann Magnetic electric current generator based on the induction principle
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Patent Citations (6)

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Publication number Priority date Publication date Assignee Title
US3035520A (en) * 1955-01-24 1962-05-22 Robert E Koeppen Inertia actuated electric unit
US3130332A (en) * 1959-03-19 1964-04-21 Rheinmetall Gmbh Electric impulse generator for the detonation of charges
US3153735A (en) * 1959-12-14 1964-10-20 Edward F Branagan Inertia electro-magnetic generator
US3116428A (en) * 1961-10-16 1963-12-31 Space Equipment Corp Force responsive electrical impulse generator
US3132268A (en) * 1962-03-05 1964-05-05 Force Controls Company Motion e.m.f. generating transducer
US3259769A (en) * 1964-01-30 1966-07-05 Albert M Stott Electrical pulse generator

Cited By (41)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3500086A (en) * 1966-02-05 1970-03-10 Max Baermann Magneto - electric pulse generator especially for igniting gas-operated devices
US3693033A (en) * 1971-06-24 1972-09-19 Electromechanisms Inc Key operated pulse generating device
US3718828A (en) * 1971-08-11 1973-02-27 Guardian Electric Mfg Co Push button pulse signal generator
US3855488A (en) * 1972-03-31 1974-12-17 Guardian Electric Mfg Co Push button pulse signal generator
US3774058A (en) * 1972-06-30 1973-11-20 Permawick Co Force transducer
US3772669A (en) * 1972-07-14 1973-11-13 Westinghouse Electric Corp Magnetic pulse generator
US3781836A (en) * 1972-07-14 1973-12-25 Westinghouse Electric Corp Self-powered wireless intrusion alarm system
US3766399A (en) * 1972-10-19 1973-10-16 M Demetrescu Combustion engine driven generator including spring structure for oscillating the inductor at the mechanical resonant frequency between power strokes
US3984707A (en) * 1973-07-13 1976-10-05 Mcclintock Richard D Spring return linear signal generator
US3937992A (en) * 1974-11-18 1976-02-10 Stackpole Carbon Company Pulse keyboard switch
US4574323A (en) * 1981-10-20 1986-03-04 Kabushiki Kaisha Suwa Seikosha Flexible magnetic disk drive
US5038061A (en) * 1990-05-25 1991-08-06 Olsen John H Linear actuator/motor
US20050035600A1 (en) * 2001-05-22 2005-02-17 Andre Albsmeier Inductive voltage generator
US7208845B2 (en) 2004-04-15 2007-04-24 Halliburton Energy Services, Inc. Vibration based power generator
US20050230973A1 (en) * 2004-04-15 2005-10-20 Fripp Michael L Vibration based power generator
US7199480B2 (en) 2004-04-15 2007-04-03 Halliburton Energy Services, Inc. Vibration based power generator
US20050230974A1 (en) * 2004-04-15 2005-10-20 Brett Masters Vibration based power generator
US20060175052A1 (en) * 2005-02-08 2006-08-10 Tips Timothy R Flow regulator for use in a subterranean well
US20060175838A1 (en) * 2005-02-08 2006-08-10 Tips Timothy R Downhole electrical power generator
US7242103B2 (en) 2005-02-08 2007-07-10 Welldynamics, Inc. Downhole electrical power generator
US7819194B2 (en) 2005-02-08 2010-10-26 Halliburton Energy Services, Inc. Flow regulator for use in a subterranean well
US20060266513A1 (en) * 2005-05-31 2006-11-30 Welldynamics, Inc. Downhole ram pump
US7785080B2 (en) 2005-05-31 2010-08-31 Welldynamics, Inc. Downhole ram pump
US20070034385A1 (en) * 2005-08-15 2007-02-15 Tips Timothy R Pulse width modulated downhole flow control
US7484566B2 (en) 2005-08-15 2009-02-03 Welldynamics, Inc. Pulse width modulated downhole flow control
US7485977B2 (en) 2006-01-06 2009-02-03 Aerodyne Research, Inc. Power generating system
US7332825B2 (en) * 2006-01-06 2008-02-19 Aerodyne Research, Inc. System and method for controlling a power generating system
US20070158946A1 (en) * 2006-01-06 2007-07-12 Annen Kurt D Power generating system
US7629699B2 (en) 2006-01-06 2009-12-08 Aerodyne Research, Inc. System and method for controlling a power generating system
US20070158947A1 (en) * 2006-01-06 2007-07-12 Annen Kurt D System and method for controlling a power generating system
US20070158945A1 (en) * 2006-01-06 2007-07-12 Aerodyne Research, Inc. System and method for controlling a power generating system
US9574556B1 (en) 2008-11-20 2017-02-21 Aerodyne Research, Inc. Free piston pump and miniature internal combustion engine
US8234932B2 (en) 2009-08-07 2012-08-07 Halliburton Energy Services, Inc. Annulus vortex flowmeter
US20110030483A1 (en) * 2009-08-07 2011-02-10 Halliburton Energy Services, Inc. Annulus vortex flowmeter
USRE49840E1 (en) 2012-04-06 2024-02-13 Wepower Technologies Llc Electrical generator with rotational gaussian surface magnet and stationary coil
US11837936B2 (en) * 2012-05-22 2023-12-05 Minebea Mitsumi, Inc. Vibrator generator having swing unit, frame and elastic member
US9923443B2 (en) 2014-06-07 2018-03-20 David Deak, SR. Hollow magnetic metal core pulse energy harvesting generator
WO2016186797A1 (en) * 2015-05-19 2016-11-24 Deak David Sr Hollow magnetic metal core pulse energy harvesting generator
US10581355B1 (en) * 2015-12-18 2020-03-03 United States Of America As Represented By The Administrator Of National Aeronautics And Space Administration Double-fed induction linear oscillating alternator
US11251007B2 (en) 2017-10-30 2022-02-15 Wepower Technologies Llc Magnetic momentum transfer generator
US11915898B2 (en) 2017-10-30 2024-02-27 Wepower Technologies Llc Magnetic momentum transfer generator

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DE1263174B (en) 1968-03-14
BE670849A (en) 1966-01-31
NL6513274A (en) 1966-04-14
GB1067887A (en) 1967-05-03
AT254981B (en) 1967-06-12

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