Linear electric generator having an improved magnet and coil structure, and method of manufacture

• US 20080054731A1
• Filed: 09/18/2007
• Published: 03/06/2008
• Est. Priority Date: 06/14/2002
• Status: Active Grant

• Current Assignee: Show-Jong Yeh, Yu-Ta Tu
• Original Assignee: Show-Jong Yeh, Yu-Ta Tu
• Inventors: Tu, Yu-Ta, Yeh, Show-Jong
• Granted Patent: US 7,573,163 B2
• Time in Patent Office: Days
• US Class Current: 310/12
• CPC Class Codes: H01F 7/021 Construction of PM H01F7/0278 takes precedence; PM compositions H01F1/032
• CPC Class Codes: H01F 7/0273 Magnetic circuits with PM for magnetic field generation
• CPC Class Codes: H02K 35/00 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 Class Codes: H02K 35/02 with moving magnets and stationary coil systems
• CPC Class Codes: H02K 39/00 Generators specially adapted for producing a desired non-sinusoidal waveform

Abstract

Linear electric generators include stationary windings and armature magnets arranged to reciprocate axially relative to the windings, or stationary magnet structures and movable windings arranged to reciprocate relative to the stationary magnet structures. The armature magnets or stationary magnet structures are in the form of multiple pole magnets made up of a plurality of individual pole structures, each pole structure including a pair of magnets joined to each other with facing poles of like polarity. In addition, the windings may be in the form of a double winding structure including at least one first clockwise winding and at least one second counterclockwise winding arranged in a multi-layered stacked arrangement.

Claims

1. A magnet structure for a linear electric generator, comprising:

at least one magnetic pole structure having poles of alternating polarities arranged in series,

wherein said magnetic pole structure comprises a pair of parallelepiped shaped dipole magnets having two ends and lateral faces, said dipole magnets in said pairs being joined together at said lateral faces such that like poles face each other, and said pairs being joined together at said ends of said individual dipole magnets to form said magnetic pole structure.

2. A magnet structure as claimed in claim 1, wherein said individual dipole magnets are joined by an adhesive.

3. A magnet structure as claimed in claim 1, wherein said individual dipole magnets are joined by welding or soldering.

4. A magnet structure as claimed in claim 1, wherein said individual dipole magnets are joined by sintering.

5. A magnet structure as claimed in claim 1, wherein said individual dipole magnets are joined by bonding.

6. A magnet structure as claimed in claim 1, wherein at least two said magnetic pole structures are joined by an adhesive.

7. A magnet structure as claimed in claim 1, wherein at least two said magnetic pole structures are joined by sintering.

8. A magnet structure as claimed in claim 1, wherein at least two said magnetic pole structures are joined by bonding.

9. A linear electric generator, comprising:

a plurality of windings aligned along an axis;

a stator comprising a plurality of windings and at least one additional stationary magnet structure positioned outside said windings;

at least one magnetic armature arranged to be moved relative to the windings along the axis upon application of an external force; and

at least one direction-reversing element provided at an end of said axis to apply a force to the magnetic armature in order to reverse its direction of travel,

wherein said magnetic armature includes a magnetic body made up of at least two magnetic pole structures joined together to form at least two north poles (N) and two south poles (S) of N-S alternating polarities arranged in series.

10. A linear electric generator as claimed in claim 9, wherein said at least one additional stationary magnet structure includes two said stationary magnet structures.

11. A linear electric generator as claimed in claim 9, wherein said at least one additional stationary magnet structure includes multiple serially connected dipole magnets.