Linear electric motor

• US 7,015,613 B2
• Filed: 04/03/2002
• Issued: 03/21/2006
• Est. Priority Date: 04/04/2001
• Status: Expired due to Fees

• Current Assignee: Empresa Brasileria de Compressors S/A Embraco
• Original Assignee: Empresa Brasileria de Compressors S/A Embraco
• Inventors: Lilie, Dietmar Erich Bernhard, Vollrath, Ingwald
• Primary Examiner(s): LE, DANG D
• Application Number:
  US10/474,272
• Publication Number:
  US 20040145247A1
• Time in Patent Office: 1,448 Days
• Field of Search: 310 12- 39, 310/156.01, 310/156.08, 310/156.12, 310/156.13, 310/156.68, 310/263, 310/156.66, 310/156.71, 417/410.1, 417/415, 417/416, 417/417
• US Class Current: 310/156.01
• CPC Class Codes: F04B 35/045 using solenoids
• CPC Class Codes: H02K 33/02 with armatures moved one way by energisation of a single coil system and returned by mechanical force, e.g. by springs

Abstract

A linear electric motor, capable of producing reciprocation of a piston within a cylinder to compress refrigerant gas. The coil of the linear electric motor is mounted to the internal wall of a block that forms the cylinder of the compressor, and a support for the magnets is mounted to an outwardly extending base flange of the piston. The support is formed by a base plate mounted to the base flange with a plurality of “L” shaped finger plates spaced around and affixed to the base plate, with the edges of the long legs of the finger plates extending radially of the piston'"'"'s central axis. Arcuated shaped permanent magnet are fitted between the opposite flat sides of each pair of the long legs of the finger plates to form a stable and rigid toroidal shaped magnet assembly positioned between the external wall of the cylinder and the coil.

Claims

1. A linear electric motor, for driving a movable member in a reciprocating motion comprising:

a coil fixedly mounted and receives an electric current;

an assembly of magnets mounted to a support structure;

a movable member comprising a support having a plurality of finger plates having a first end and a second end wherein the first end is mounted to the movable member, and a magnet of arcuate shape mounted between each pair of adjacent finger plates to form a toroidal assembly of magnets wherein the second end is mounted only to the magnet.

2. A linear electric motor as claimed in claim 1, used in a compressor having a piston as the movable member that is to be reciprocated in a cylinder to compress gas, wherein the support structure is mounted to the piston and reciprocates with the piston.

3. A linear electric motor as claimed in claim 2, wherein each finger plate is formed of a flat material, with an edge being disposed radially aligned in relation to the central axis of the piston.

4. A linear electric motor as claimed in claim 3, wherein the support has a base plate mounted to the piston and to which the finger plates are affixed.

5. A linear electric motor as claimed in claim 3, wherein the piston has a base flange to which the finger plates are affixed.

6. A linear electric motor as claimed in claim 3, wherein the piston has a base flange and the support has a base plate to which the finger plates are mounted, the base plate being mounted to the base flange of the piston.

7. A linear electric motor as claimed in claim 6, wherein the finger plates are bent to form an “

L”

shape with a tab that is attached to the base plate and with a long leg to which is attached the magnet.

8. A linear electric motor as claimed in claim 6, wherein the compressor has a block with an internal wall to which the coil is attached and in which the cylinder is formed, wherein the toroidal assembly of magnets is positioned and moves linearly between the external wall of the cylinder and the coil.

9. A linear electric motor as claimed in claim 7, wherein the compressor has a block with an internal wall to which the coil is attached and in which the cylinder is formed, wherein the toroidal assembly of magnets is positioned and moves linearly between the external wall of the cylinder and the coil.

10. A linear electric motor, for driving a movable member in a reciprocating motion comprising:

a coil fixedly mounted and receives an electric current;

a support structure having a plurality of “

L”

shaped finger plates, a base plate, and a free end, wherein the base plate is mounted to the movable member;

an assembly of magnets mounted to the support structure; and

a magnet of arcuate shape mounted between each pair of adjacent finger plates to form a toroidal assembly of magnets.

11. A linear electric motor, for driving a movable member in a reciprocating motion comprising:

a coil fixedly mounted and receives an electric current;

a support structure having a plurality of finger plates with only one end connected to the movable member and the other end free to allow for direct attachment to magnets;

an assembly of magnets mounted to the support structure; and

a magnet of arcuate shape mounted between each pair of adjacent finger plates to form a toroidal assembly of magnets.