Vibration power generator with elastic members fixed to a housing and coils poistioned between magnets

Patent metadata

Field	Value
Publication number	US-10811949-B2
Application number	US-201715443412-A
Country	US
Kind code	B2
Filing date	Feb 27, 2017
Priority date	Jun 20, 2016
Publication date	Oct 20, 2020
Grant date	Oct 20, 2020

Abstract

According to one embodiment, a vibration power generator includes a housing, an elastic member, a mover, and a coil. The elastic member is fixed to the housing. The mover is supported by the elastic member and able to vibrate in a first direction. The coil is positioned inside the mover. The mover includes a first magnet, a second magnet, a third magnet, and a first magnetic yoke. The second magnet is placed to be aligned with the first magnet in the first direction so as to repel each other. The third magnet is placed annularly with respect to the first magnet and the second magnet. The first magnetic yoke surrounds the first magnet, the second magnet and the third magnet. The coil is positioned between the third magnet, and both the first magnet and the second magnet.

First claim

What is claimed is:

1. A vibration power generator comprising:
a housing;
a first elastic member fixed to the housing;
a second elastic member fixed to the housing;
a mover supported by being held by the first elastic member and the second elastic member, and able to vibrate in a first direction; and
a coil positioned inside the mover, wherein
the mover includes
a first magnet,
a second magnet placed to be aligned with the first magnet in the first direction so as to repel each other,
a third magnet placed annularly with respect to the first magnet and the second magnet,
a fourth magnet aligned with the third magnet in the first direction,
a first magnetic yoke surrounding the first magnet and the third magnet, and
a third magnetic yoke facing the first magnetic yoke and surrounding the second magnet and the fourth magnet,

the coil is positioned between both the first magnet and the second magnet, and both the third magnet and the fourth magnet,
a center of an upper surface of the first magnetic yoke is connected to the first elastic member near a central axis of the housing in the first direction, and
a center of a bottom surface of the third magnetic yoke is connected to the second elastic member near the central axis of the housing in the first direction.

2. The vibration power generator according to claim 1 , wherein the mover further includes a second magnetic yoke between the first magnet and the second magnet.

3. The vibration power generator according to claim 1 , wherein the third magnet has magnetic poles in the second direction.

4. The vibration power generator according to claim 1 , further comprising:
a first magnetic shield and a second magnetic shield placed in contact with facing surfaces of the first magnet and the second magnet respectively so as to have a gap between the first magnetic shield and the second magnetic shield.

5. A vibration power generating unit comprising:
the vibration power generator according to claim 1 ; and
at least one of a power storage and an output circuit.

6. A vibration power generating module comprising:
the vibration power generating unit according to claim 5 ; and
at least one of a communication device and an external load.

7. An electrical device comprising:
the vibration power generating module according to claim 6 ; and
a circuit board with electronic components mounted.

8. The vibration power generator according to claim 1 , wherein
the first magnet and the second magnet pass a magnetic flux through in a second direction intersecting the first direction, and
the coil is supported by the housing from the second direction.

9. The vibration power generator according to claim 8 , further comprising:
a coil fixing member fixed to an internal side surface of the housing;
wherein the coil is fixed to a lateral surface of the coil fixing member.

10. The vibration power generator according to claim 9 , wherein
the third magnet and the fourth magnet have magnetic poles in the second direction, and
respective magnetic poles of the third magnet and the fourth magnet on the side facing the coil are the same magnetic pole.

11. The vibration power generator according to claim 9 , wherein
the third magnet and the fourth magnet have magnetic poles in the first direction, and
respective magnetic poles of facing surfaces of the third magnet and the fourth magnet are the same magnetic pole to repel each other.

Assignees

• Toshiba Kk

Inventors

• Oonishi Atsuro
• Ogawa Akihito
• Takahashi Hiroshi
• Enamito Akihiko
• Ooga Junichiro

Classifications

• H02J1/00

  Circuit arrangements for DC mains or DC distribution networks · CPC title

• H02J50/00

  Circuit arrangements or systems for wireless supply or distribution of electric power · CPC title

• H02J50/001

  Energy harvesting or scavenging · CPC title

• H02J7/34

  Parallel operation in networks using both storage and other DC sources, e.g. providing buffering (H02J7/14 takes precedence) · CPC title

• H02K35/02 Primary

  with moving magnets and stationary coil systems · CPC title