Vibration power generator

Patent metadata

Field	Value
Publication number	US-10840790-B2
Application number	US-201816226171-A
Country	US
Kind code	B2
Filing date	Dec 19, 2018
Priority date	Dec 25, 2017
Publication date	Nov 17, 2020
Grant date	Nov 17, 2020

Abstract

A vibration power generator includes a coil attached to a frame and a moving body that is supported on the frame through a spring and has a magnet facing the coil, and relatively moves the moving body with respect to the coil to generate electric power. The moving body has the magnet, a yoke material that is attached to the magnet and forms a magnetic circuit, and a weight member. Average specific gravity of the moving body is 8 g/cm3 or more.

First claim

What is claimed is:

1. A vibration power generator comprising:
a coil attached to a frame; and
a moving body that is supported on the frame through a spring and has a magnet facing the coil,
the vibration power generator relatively moving the moving body with respect to the coil to generate electric power,
wherein the moving body has
the magnet,
a yoke material that is attached to the magnet and forms a magnetic circuit, and
a weight member,

wherein average specific gravity of the moving body is 8 g/cm 3 or more,
wherein the yoke material is disposed on a side of the magnet opposite to the coil, and
wherein a magnetic path on the coil side of the magnet is an open magnetic path.

2. The vibration power generator according to claim 1 ,
wherein the weight member contains a substance having specific gravity of 8 g/cm 3 or more.

3. The vibration power generator according to claim 2 ,
wherein the weight member is formed of a resin containing a powder of the substance having specific gravity of 8 g/cm 3 or more.

4. The vibration power generator according to claim 2 ,
wherein the substance having specific gravity of 8 g/cm 3 or more is tungsten.

5. The vibration power generator according to claim 2 ,
wherein the moving body has at least two weight members, and the at least two weight members are attached to the yoke material so as to interpose the magnet therebetween as viewed along a direction in which the coil and the magnet face each other.

6. The vibration power generator according to claim 2 ,
wherein the moving body has at least two weight members, and the at least two weight members are attached to the yoke material so as to interpose the yoke material therebetween in a direction in which the coil and the magnet face each other.

7. The vibration power generator according to claim 1 ,
wherein the magnet includes a first magnet and a second magnet,
wherein the first magnet and the second magnet are disposed side by side along a movement direction when the moving body relatively moves with respect to the coil,
wherein in the first magnet, an N pole side is oriented to the coil side and an S pole side is in contact with the yoke material, and
wherein in the second magnet, the S pole side is oriented to the coil side and the N pole side is in contact with the yoke material.

8. The vibration power generator according to claim 1 ,
wherein the spring has a first tension coil spring and a second tension coil spring that are connected to the frame and elastically support the moving body from mutually opposite directions, and
wherein Vickers hardness of the frame is equal to or less than 700.

9. The vibration power generator according to claim 1 ,
wherein the spring elastically supports the moving body such that a gap is formed between the moving body and the coil.

10. The vibration power generator according to claim 9 ,
wherein the spring has a first tension coil spring and a second tension coil spring that are connected to the frame and elastically support the moving body from mutually opposite directions.

11. The vibration power generator according to claim 1 , wherein the coil is an air-core coil.

12. The vibration power generator according to claim 1 ,
wherein the magnet is attached at a position shifted from an axial line of the spring, and
wherein the weight member adjusts a position of the center-of-gravity of the moving body.

13. The vibration power generator according to claim 12 ,
wherein the weight member is a high specific gravity material having higher specific gravity than the magnet.

14. The vibration power generator according to claim 12 ,
wherein the yoke material has a first surface on which the magnet is attached, and a second surface that is oriented to a side opposite to the first surface and on which the weight member is attached and is provided on the axial line of the spring.

15. The vibration power generator according to claim 1 , further comprising:
a circuit that is fixable on a surface of the frame facing the magnet and includes a magnetic body,
wherein the magnet is movable in an expansion and contraction direction of the spring, and
wherein the circuit is fixed such that the magnetic body is located outside a range where a movable range of the magnet is projected onto the surface.

16. The vibration power generator according to claim 15 ,
wherein the circuit is a rectifier circuit that converts generated AC power into DC power and adjusts a voltage of the DC power.

17. A vibration power generator comprising:
a coil attached to a frame; and
a moving body that is supported on the frame through a spring and has a magnet facing the coil,
the vibration power generator relatively moving the moving body with respect to the coil to generate electric power,
wherein the moving body has
the magnet,
a yoke material that is attached to the magnet and forms a magnetic circuit, and
a weight member,

wherein average specific gravity of the moving body is 8 g/cm 3 or more,
wherein the spring has a first tension coil spring and a second tension coil spring that are connected to the frame and elastically support the moving body from mutually opposite directions, and
wherein Vickers hardness of the frame is equal to or less than 700,
wherein the frame has a vibration input surface to which a vibration is input, a first connecting portion to which the first tension coil spring is connected, and a second connecting portion to which the second tension coil spring is connected, and
wherein the vibration input surface is connected with the first connecting portion and the second connecting portion on the frame by a material having Young's modulus that is equal to or larger than 40 GPa.

18. The vibration power generator according to claim 17 , further comprising:
a first connecting member that connects the first tension coil spring to the frame in the first connecting portion; and
a second connecting member that connects the second tension coil spring to the frame in the second connecting portion,
wherein the first connecting member and the second connecting member are formed of the material having Young's modulus that is equal to or larger than 40 GPa.

19. A vibration power generator comprising:
a coil attached to a frame; and
a moving body that is supported on the frame through a spring and has a magnet facing the coil,
the vibration power generator relatively moving the moving body with respect to the coil to generate electric power,
wherein the moving body has
the magnet,
a yoke material that is attached to the magnet and forms a magnetic circuit, and
a weight member,

wherein average specific gravity of the moving body is 8 g/cm 3 or more,
wherein the magnet is attached at a position shifted from an axial line of the spring,
wherein the weight member adjusts a position of the center-of-gravity of the moving body,
wherein the moving body is suspended by at least four springs,
wherein two springs of the four springs extend from the moving body in a first direction and remaining two springs extend from the moving body in a second direction which is a direction opposite to the first direction, and
wherein the weight member adjusts a position of the center-of-gravity of the moving body so as to be located inside a space obtained by offsetting by a diameter of the spring in a racial direction of the spring with respect to a plane formed by connecting attachment portions of the four springs with respect to the frame.

Assignees

• Futaba Denshi Kogyo Kk

Inventors

• Kudo Shotaro

Classifications

• H02N2/186

  Vibration harvesters · CPC title

• H02K35/02 Primary

  with moving magnets and stationary coil systems · CPC title

• H02K7/02

  Additional mass for increasing inertia, e.g. flywheels · CPC title

• F03G7/08

  recovering energy derived from swinging, rolling, pitching or like movements, e.g. from the vibrations of a machine · CPC title

• H02K2213/03

  Machines characterised by numerical values, ranges, mathematical expressions or similar information · CPC title