LINEAR ELECTRICAL MACHINE FOR ELECTRIC POWER GENERATION OR MOTIVE DRIVE

• US 20070108850A1
• Filed: 11/17/2006
• Published: 05/17/2007
• Est. Priority Date: 11/17/2005
• Status: Abandoned Application

• Current Assignee: Tiax, LLC
• Original Assignee: Tiax, LLC
• Inventors: Chertok, Allan
• Application Number:
  US11/561,215
• Publication Number:
  US 20070108850A1
• Time in Patent Office: Days
• US Class Current: 310/15
• CPC Class Codes: H02K 1/145 having an annular coil, e.g. of the claw-pole type
• CPC Class Codes: H02K 33/16 with polarised armatures moving in alternate directions by reversal or energisation of a single coil system
• CPC Class Codes: H02K 35/02 with moving magnets and stationary coil systems

Abstract

A linear electrical machine may function as an alternator or a motor. Three annular magnets may be provided that move relative to a core. The magnets may all have a different magnetic orientation. Two magnets may have a north pole oriented in a direction parallel to an axis along which the magnets move relative to the core. Another magnet may have a north pole oriented in a direction perpendicular to the axis. The core may include a plurality of ferromagnetic core elements; and a support structure composed of a composite material defining plural spaces, each for receiving one of the plurality of core elements. The core may further include a core shield disposed on the support structure substantially following a perimeter of the support structure defining an opening through which a reciprocating element can pass. Furthermore, the magnets may be supported in a reciprocating element having a low reluctance ferromagnetic frame there being a clearance gap between the machine core and the reciprocating element, the frame having a thicker section adjacent the gap, so as to desirably increase magnet flux linkage with an armature coil.

Claims

1. A hybrid core for an electric machine, comprising:

a plurality of ferromagnetic core elements; and

a support structure composed of a composite material defining plural spaces, each for receiving one of the plurality of core elements.

2. The core of claim 1, wherein the ferromagnetic core elements each comprise:

a core lamination stack including plural layers of a high permeability soft ferromagnetic sheet material.

3. The core of claim 1, wherein the support structure further comprises:

a shell defining the plural spaces and further defining together with the core elements a cavity for receiving a coil.

4. The core of claim 1, wherein the composite material further comprises:

a high permeability soft ferromagnetic material.

5. The core of claim 1, wherein the composite material further comprises:

a filled resin having high thermal conductivity and strength.

6. The core of claim 5, wherein the filled resin comprises glass-filled nylon.

7. The core of claim 5, wherein the filled resin comprises glass-filled epoxy.

8. The core of claim 1, wherein the support structure further comprises:

a plurality of generally wedge-shaped segments defining the plural spaces between faces of adjacent core elements and further defining together with the core elements a cavity for receiving a coil.

9. The core of claim 8, wherein the composite material further comprises:

a high permeability soft ferromagnetic material.

10. The core of claim 8, wherein the composite material further comprises:

a filled resin having high thermal conductivity and strength

11. The core of claim 10, wherein the filled resin comprises a glass-filled nylon.

12. The core of claim 10, wherein the filled resin comprises a glass-filled epoxy.

13. The core of claim 1, further comprising:

a core shield disposed on the support structure substantially following a perimeter of the support structure defining an opening through which a reciprocating element can pass.

14. The core of claim 1, further comprising:

a reciprocating element passing through the opening ferromagnetic frame supporting at least one magnet, there being a clearance gap between the machine core and the reciprocating element, the frame using a thicker section adjacent to the gap, so as to desirably increase magnetic flux linkage with an armature coil supported within a cavity defined by the support structure.

15. A core for an electric machine, comprising:

a ferromagnetic shell having a first cavity defined therein for receiving a coil, and having a second cavity defined therein by a perimeter and through which a moving element can pass; and

a core shield disposed on the shell substantially following the perimeter of the second cavity and displaced on the shell away from the second cavity.

16. A movable element for an electric machine, comprising:

a reciprocating element including a low reluctance ferromagnetic frame supporting at least one magnet for reciprocation within a cavity formed in a machine core, there being a clearance gap between the machine core and the reciprocating element, the frame having a thicker section adjacent the gap, so as to desirably increase magnet flux linkage with an armature coil.