Rotationally stabilized guidable projectile and method for guiding the same

Patent metadata

Field	Value
Publication number	US-9360286-B2
Application number	US-201214130635-A
Country	US
Kind code	B2
Filing date	Jun 26, 2012
Priority date	Jul 7, 2011
Publication date	Jun 7, 2016
Grant date	Jun 7, 2016

Abstract

The invention relates to a rotationally stabilized projectile ( 1 ) for launching from a barrel, which projectile ( 1 ) comprises a front projectile part ( 22 ), a rear projectile part ( 20 ) comprising a rotating band ( 4 ), and an intermediate projectile part ( 21 ) comprising a freely rotatable middle section ( 2 ) arranged with guide wings ( 3 ) for improving the gliding capability and guidance capability during the gliding phase and end phase of the projectile. The guide wings ( 3 ) are arranged extensibly on the freely rotatable middle section ( 2 ), and the intermediate projectile part ( 21 ) also comprises a regulator device ( 14 ) for regulating the rotation of the middle section ( 2 ). The invention also relates to a method for guiding a rotationally stabilized projectile.

First claim

The invention claimed is:

1. A rotationally stabilized projectile which is to be launched from a barrel, and wherein said projectile comprises
a front projectile part,
a rear projectile part-comprising a rotating band, and
an intermediate projectile part comprising a freely rotatable middle section arranged with at least two radially extendable guide wings,
wherein the guide wings are arranged extensibly on the freely rotatable middle section and are located in front of the rotating band, and wherein the intermediate projectile part also comprises a regulator device for regulating the rotation of the middle section.

2. The projectile according to claim 1 , wherein the regulator device is of the electromagnetic type comprising permanent magnets coaxially arranged on the inner side of the rotatable middle section concentrically around an electrical winding disposed on the intermediate projectile part, wherein the number and sizes of the permanent magnets are chosen such that a rotation of the middle section induce a magnetic field in the electrical winding, so that an electric current is generated in an electrical resistance connected to the electrical winding, which electric current manifests as a braking force upon the rotating middle section.

3. The projectile according to claim 1 , wherein the regulator device is of the electromagnetic type comprising an electrical winding coaxially arranged on the inner side of the rotatable middle section concentrically around permanent magnets disposed on the intermediate projectile part, wherein the number and sizes of the permanent magnets are chosen such that a rotation of the middle section induce a magnetic field in the electrical winding, so that an electric current is generated in an electrical resistance connected to the electrical winding, which electric current manifests as a braking force upon the rotating middle section.

4. The projectile according to claim 2 , wherein the electrical winding will be variably loaded via the connection of different electrical resistances for generation of a variable brake force in the middle section.

5. The projectile according to claim 1 , wherein the regulator device is of the electromagnetic type comprising permanent magnets coaxially arranged on the inner side of the rotatable middle section concentrically around an electrical winding disposed on the intermediate projectile part for the creation of variable rotational force on the middle section by virtue of the fact that the number and sizes of the permanent magnets are chosen such that a static magnetic field oppositely directed to a variable magnetic field created by the electrical winding which has been variably energized from a separate electrical energy storage unit.

6. The projectile according to claim 1 , wherein the regulator device is of the electromagnetic type comprising an electrical winding coaxially arranged on the inner side of the rotatable middle section concentrically around permanent magnets disposed on the intermediate projectile part for the creation of variable rotational force on the middle section by virtue of the fact that the number and sizes of the permanent magnets-are chosen for the creation of a static magnetic field oppositely directed to a variable magnetic field created by the electrical winding which has been variably energized from a separate electrical energy storage unit.

7. The projectile according to claim 5 , wherein the separate electrical energy storage unit is a chargeable capacitor.

8. The projectile according to claim 5 , wherein the separate electrical energy storage unit is a chargeable battery.

9. The projectile according to claim 5 , wherein the separate electrical energy storage unit is a fuel cell.

10. The projectile according to claim 1 , wherein the middle section comprises two extensible guide wings oppositely placed relative to each other on either side of the projectile.

11. The projectile according to claim 1 , wherein the middle section comprises four extensible guide wings evenly distributed around the projectile.

12. The projectile according to claim 1 , wherein the middle section is rotatably mounted on the intermediate projectile part with slide bearings.

13. A method for guiding a projectile during the gliding and end phase of the projectile, which projectile comprises
a front projectile part,
a rear projectile part comprising a rotating band, and
an intermediate projectile part comprising a middle section rotatable relative to the projectile and arranged with at least two radially extendable guide wings, wherein the guide wings are located in front of a rotating band, and
wherein the projectile is guided towards a projectile target by extension of the guide wings and by virtue of the fact that the rotation of the rotatable middle section via a regulator device, in response to control signals from a control unit, is regulated to the correct position relative to the projectile.

14. The method according to claim 13 , wherein the rotation of the middle section is controlled electromagnetically by the regulator device by resistive loading of the electrical winding on the intermediate projectile part, via the connection of various electrical resistances.

15. The method according to claim 13 , wherein the rotation of the middle section is controlled electromagnetically by the regulator device by energization of the electrical winding on the intermediate projectile part, via a separate electrical energy storage unit.

16. The projectile according claim 3 , wherein the electrical winding will be variably loaded via the connection of different electrical resistances for generation of a variable brake force in the middle section.

17. The projectile according to claim 6 , wherein the separate electrical energy storage unit is a chargeable capacitor.

18. The projectile according to claim 6 , wherein the separate electrical energy storage unit is a chargeable battery.

19. The projectile according to claim 5 , wherein the separate electrical energy storage unit-is a fuel cell.

20. The projectile according to claim 2 , wherein the middle section comprises two extensible guide wings oppositely placed relative to each other on either side of the projectile.

Assignees

• Pettersson Thomas
• Brohede Daniel
• Bae Systems Bofors Ab

Inventors

• Pettersson Thomas
• Brohede Daniel

Classifications

• F42B10/26 Primary

  using spin (F42B10/04, F42B10/12, F42B10/14, F42B10/24, F42B14/02 take precedence) · CPC title

• F42B10/64

  of fins · CPC title

• F42B10/54

  Spin braking means · CPC title

• F42B10/14 Primary

  using fins spread or deployed after launch, e.g. after leaving the barrel · CPC title