Power generator, power generator set and power generation system

Patent metadata

Field	Value
Publication number	US-10291107-B2
Application number	US-201414907026-A
Country	US
Kind code	B2
Filing date	Jul 23, 2014
Priority date	Jul 24, 2013
Publication date	May 14, 2019
Grant date	May 14, 2019

Abstract

A power generator 100 includes a power generating unit 10 and a supporting member 20 for supporting the power generating unit 10 . The power generating unit 10 constitutes a two-degree-freedom vibration system including a first vibration system having a coil assembly 40 and a first spring portion 64 for coupling the coil assembly 40 with a housing 20 and a second vibration system having a magnet assembly 30 and a second spring portion 65 for coupling the magnet assembly 30 with the coil assembly 40 . The power generating unit 10 is configured so that each of a first natural frequency ω 1 of the first vibration system and a second natural frequency ω 2 of the second vibration system is in the range of 14 to 42 Hz.

First claim

What is claimed is:

1. A power generator to be used in a state that the power generator is fixedly attached to an air-conditioning duct, the power generator comprising:
a power generating unit for generating electric power by utilizing vibration of the air-conditioning duct; and
a supporting member for supporting the power generating unit,
wherein the power generating unit constitutes a two-degree-freedom vibration system including a first vibration system having a first mass portion and a first spring portion for coupling the first mass portion with the supporting member and a second vibration system having a second mass portion and a second spring portion for coupling the second mass portion with the first mass portion,
wherein a second mass m 2 [kg] of the second mass portion is smaller than a first mass m 1 [kg] of the first mass portion, and
wherein the power generating unit is configured so that each of a first natural frequency ω 1 of the first vibration system and a second natural frequency ω 2 of the second vibration system is in the range of 14 to 42 Hz by adjusting the first mass m 1 [kg] of the first mass portion, a first spring constant k 1 [N/m] of the first spring portion, the second mass m 2 [kg] of the second mass portion and a second spring constant k 2 [N/m] of the second spring portion,
wherein the second mass portion includes a permanent magnet provided so that the permanent magnet can be displaced along a magnetization direction thereof,
wherein the first mass portion includes a coil provided on the outer peripheral side of the permanent magnet so as to surround the permanent magnet,
wherein the first mass portion further includes a holding member for holding the coil, and
wherein the holding member is formed of a resin material containing non-magnetic metallic particles.

2. The power generator claimed in claim 1 , wherein the power generator is configured so that each of the first natural frequency ω 1 of the first vibration system and the second natural frequency ω 2 of the second vibration system is in the range of 14 to 38 Hz.

3. The power generator claimed in claim 1 , wherein a first natural angular frequency Ω 1 =(k 1 /m 1 ) 1/2 of the first vibration system is in the range of 200 to 250 rad/S, a second natural angular frequency Ω 2 =(k 2 /m 2 ) 1/2 of the second vibration system is in the range of 60 to 120 rad/S and a mass ratio μ=m 2 /m 1 of the first mass portion and the second mass portion is in the range of 0.4 to 1.

4. The power generator claimed in claim 1 , wherein when a power generation amount of the power generator at a first resonance frequency of the power generator is defined as “A 1 ” [mW/100 mG] and a power generation amount of the power generator at a second resonance frequency of the power generator is defined as “A 2 ” [mW/100 mG], the power generator is configured so that “A 1 ” and “A 2 ” satisfy a relationship of 0.9A 2 ≤A 1 ≤1.1A 2 .

5. The power generator claimed in claim 4 , wherein when a minimum power generation amount of the power generator in a frequency band between the first resonance frequency and the second resonance frequency is defined as “A 3 ” [mW/100 mG], the power generator is configured so that “A 3 ” is equal to or more than 0.25[(A 1 +A 2 )/2] [mW/100 mG] but less than 0.8[(A 1 +A 2 )/2] [mW/100 mG].

6. The power generator claimed in claim 4 , wherein when a minimum power generation amount of the power generator in a frequency band between the first resonance frequency and the second resonance frequency is defined as “A 3 ” [mW/100 mG], the power generator is configured so that “A 3 ” is equal to or more than 0.8[(A 1 +A 2 )/2] [mW/100 mG] but equal to or less than 0.9[(A 1 +A 2 )/2] [mW/100 mG].

7. The power generator claimed in claim 4 , wherein the power generator is configured to satisfy the relationship of the power generation amounts by setting damping coefficients C 2 of the second vibration system respectively corresponding to the first natural frequency and the second natural frequency.

8. The power generator claimed in claim 7 , wherein the damping coefficient C 2 corresponding to the first natural frequency is in the range of 6 to 10 [N/(m/s)] and the damping coefficient C 2 corresponding to the second natural frequency is in the range of 6 to 10 [N/(m/s)].

9. The power generator claimed in claim 1 , wherein the second mass portion further includes a magnetic member fixed to the permanent magnet,
the magnetic member is formed of a magnetic material having a specific weight equal to or more than 7, and
the permanent magnet is coupled with the second spring portion through the magnetic member.

10. A power generator set comprising:
the power generator defined in claim 1 ; and
a weight for adjusting a power generation amount of the power generator.

11. A power generation system comprising:
the power generator defined in claim 1 ; and
an air-conditioning duct to which the power generator is fixedly attached through the supporting member.

12. A power generator to used in a state that the power generator is fixedly attached to an air-conditioning duct, the power generator comprising:
a power generating unit for generating electric power by utilizing vibration of the air-conditioning duct; and
a supporting member for supporting the power generating unit,
wherein the power generating unit constitutes a two-degree-freedom vibration system including a first vibration system having a first mass portion and a first spring portion for coupling the first mass portion with the supporting member and a second vibration system having a second mass portion and a second spring portion for coupling the second mass portion with the first mass portion,
wherein a second mass m 2 [kg] of the second mass portion is smaller than a first mass m 1 [kg] of the first mass portion, and
wherein the power generating unit is configured so that each of a first natural frequency ω 1 of the first vibration system and a second natural frequency ω 2 of the second vibration system is in the range of 14 to 42 Hz by adjusting the first mass m 1 [kg] of the first mass portion, a first spring constant k 1 [N/m] of the first spring portion, the second mass m 2 [kg] of the second mass portion and a second spring constant k 2 [N/m] of the second spring portion,
wherein the second mass portion includes a permanent magnet provided so that the permanent magnet can be displaced along a magnetization direction thereof,
wherein the first mass portion includes a coil provided on the outer peripheral side of the permanent magnet so as to surround the permanent magnet,
wherein the second mass portion further includes a magnetic member fixed to the permanent magnet, and
wherein the permanent magnet is coupled with the second spring portion through the magnetic member.

Assignees

• Mitsumi Electric Co Ltd

Inventors

• Furukawa Kenichi
• Yamada Kensuke

Classifications

• H02K35/02 Primary

  with moving magnets and stationary coil systems · CPC title

• H02K7/1876

  with reciprocating, linearly oscillating or vibrating parts · CPC title

• H02N1/08

  with conductive charge carrier, i.e. capacitor machines · CPC title

• H02K35/00 Primary

  Generators with reciprocating, oscillating or vibrating coil system, magnet, armature or other part of the magnetic circuit (arrangements for handling mechanical energy structurally associated with generators H02K7/00, e.g. H02K7/06) · CPC title

• H02N2/185

  using fluid streams · CPC title