IP Library › Granted Patent US 12683448
Granted Patent B2
US 12683448 · App. 18/629,515 · Granted Jul 14, 2026

Motor inner iron assembly for a reciprocating compressor

Inventor: Gregory William Hahn (Mt. Washington, KY)
Assignee: Haier US Appliance Solutions, Inc.
H02K1/34H02K15/03
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Quick Facts
Patent No.
US 12683448
App. No.
18/629,515
Granted
Jul 14, 2026
Kind
B2
Abstract

A motor assembly for a linear compressor defines an axial direction and a radial direction and includes an inner iron lamination assembly comprising a plurality of laminations stacked along the axial direction, a permanent magnet assembly attached to the inner iron lamination assembly, a front ring assembly attached to a first end of the inner iron lamination assembly, a back ring assembly attached to a second end of the inner iron lamination assembly, a plurality of bosses mounted to the first end and the second end of the inner iron lamination assembly, and a planar spring assembly attached to the plurality of bosses of the inner iron lamination assembly.

Claims (38)

1 . A motor assembly for a linear compressor defining an axial direction and a radial direction, the motor assembly comprising:

an inner iron lamination assembly comprising a plurality of laminations stacked along the axial direction;

a permanent magnet assembly attached to the inner iron lamination assembly;

a front ring assembly attached to a first end of the inner iron lamination assembly;

a back ring assembly attached to a second end of the inner iron lamination assembly;

a plurality of bosses mounted to the first end and the second end of the inner iron lamination assembly; and

a planar spring assembly attached to the plurality of bosses of the inner iron lamination assembly.

2 . The motor assembly of claim 1 , wherein the permanent magnet assembly is epoxied to an outer radial surface of the inner iron lamination assembly.

3 . The motor assembly of claim 1 , wherein an outer radial surface of the inner iron lamination assembly defines a radial recess and the permanent magnet assembly is seated within the radial recess.

4 . The motor assembly of claim 3 , wherein a maximum diameter of the inner iron lamination assembly is substantially equal to an outer diameter of the permanent magnet assembly.

5 . The motor assembly of claim 1 , wherein the inner iron lamination assembly defines a front annular slot at the first end and a back annular slot at the second end, the motor assembly further comprising:

a front metal ring that is press fit into the front annular slot; and

a back metal ring that is press fit into the back annular slot.

6 . The motor assembly of claim 1 , wherein the front ring assembly and the back ring assembly are welded or brazed directly to the inner iron lamination assembly.

7 . The motor assembly of claim 1 , wherein the planar spring assembly is bolted to the bosses.

8 . The motor assembly of claim 1 , further comprising:

an outer iron lamination assembly positioned outside the inner iron lamination assembly along the radial direction.

9 . The motor assembly of claim 8 , wherein the planar spring assembly maintains an airgap between the inner iron lamination assembly and the outer iron lamination assembly.

10 . The motor assembly of claim 1 , wherein the bosses are mounted to the front ring assembly and the back ring assembly.

11 . The motor assembly of claim 10 , wherein the bosses are resistance welded to the front ring assembly and the back ring assembly.

12 . The motor assembly of claim 1 , wherein the back ring assembly defines internal threads, the motor assembly further comprising:

a piston flex mount attached to the back ring assembly using the internal threads.

13 . A method of assembling a motor assembly for a linear compressor, the method comprising:

stacking a plurality of laminations stacked along an axial direction to form an inner iron lamination assembly;

attaching a front ring assembly to a first end of the inner iron lamination assembly;

attaching a back ring assembly to a second end of the inner iron lamination assembly;

attaching a permanent magnet assembly to an outer radial surface of the inner iron lamination assembly;

mounting a plurality of bosses to the first end and the second end of the inner iron lamination assembly; and

attaching a planar spring assembly to the plurality of bosses of the inner iron lamination assembly.

14 . The method of claim 13 , wherein the front ring assembly and the back ring assembly are welded or brazed directly to the inner iron lamination assembly.

15 . The method of claim 13 , wherein the outer radial surface of the inner iron lamination assembly defines a radial recess and the permanent magnet assembly is seated within the radial recess.

16 . The method of claim 13 , further comprising:

positioning an outer iron lamination assembly outside the inner iron lamination assembly along a radial direction, wherein the planar spring assembly maintains an airgap between the inner iron lamination assembly and the outer iron lamination assembly.

17 . The method of claim 13 , wherein the inner iron lamination assembly defines a front annular slot at the first end and a back annular slot at the second end, the method further comprising:

press fitting a front metal ring into the front annular slot; and

press fitting a back metal ring into the back annular slot.

18 . The method of claim 13 , wherein the back ring assembly defines internal threads, the method further comprising:

attaching a piston flex mount to the back ring assembly using the internal threads.