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

• US 7,952,238 B2
• Filed: 03/17/2009
• Issued: 05/31/2011
• Est. Priority Date: 06/14/2002
• Status: Expired due to Fees

• Current Assignee: Sunyen Company Limited
• Original Assignee: Sunyen Company Limited
• Inventors: Tu, Yu-Ta, Yeh, Show-Jong
• Primary Examiner(s): Le; Dang D
• Application Number:
  US12/382,431
• Publication Number:
  US 20100289347A1
• Time in Patent Office: 805 Days
• Field of Search: 310/12.01, 310/12.12, 310/12.13, 310/12.24
• US Class Current: 310/12.24
• 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 linear electric generator, comprising:

a stator comprising a plurality of windings aligned along an axis 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,

a magnetic body made up of at least four magnetic pole structures, each magnetic pole structure including a north pole and a south pole, said magnetic pole structures abutting each other such that north poles of first and second said magnetic pole structures face each other to form a north pole of said armature, a south pole of said second magnetic pole structure and a south pole of a third said magnetic pole structure face each other to form a south pole of said armature, and respective additional poles at ends of said armature form additional south and north poles of said armature to provide at least two north poles (N) and two south poles (S) of N-S alternating polarities arranged in series.

2. A linear electric generator as claimed in claim 1, wherein said at least one additional stationary magnet structure includes two said stationary magnet structures.

3. A linear electric generator as claimed in claim 1, wherein said at least one additional stationary magnet structure includes multiple serially connected dipole magnets.