§
Luxuse
Patent Intelligence
Sign In
← Back to Patent Explorer
US4918831A Expired / Lapsed US ⏱️ 0.0 years remaining

Method of fabricating composite rotor laminations for use in reluctance, homopolar and permanent magnet machines

Assignee: General Electric Co
•
Filing: 1989-10-20
•
Granted: 1990-04-24
•
Expires: 2009-10-20
📄 Original PDF 🌐 Google Patents 🔄 Sync Now

Abstract

Abstract In a homopolar, switched reluctance, or interior permanent magnet motor, formed rotor laminations are employed to reduce eddy current losses in the pole faces and body of the rotor. The homopolar and switched reluctance motor lamination is comprised of a magnetic portion having a plurality of pole pieces extending generally radially outward from the core portion and forming a plurality of interpole spaces. Non-magnetic, high resistance segments are bonded between the pole pieces to minimize windage losses and increase strength. The non-magnetic segments may be thinner in the axial direction than the magnetic portion to prevent contact between stack laminations. Additionally, a gap may be left between the interior core portion and the non-magnetic segment to facilitate use of automated welding techniques. In the interior permanent magnet motor lamination, the non-magnetic segments perform the function of circumferential bridges, with or without restraining ligaments, to increase the rotor strength and speed capability and increase specific torque.

Inventors

  • 👤 Gerald B. Kliman

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-30 06:09
CPC Classifications
H; H02; H02K; H02K19/00; H02K19/02; H02K19/10; H02K19/103; H02K1/00; H02K1/06; H02K1/22; H02K1/24; H02K1/246; H02K15/00; H02K15/02; H02K15/03; H02K19/16; H02K19/18; H02K19/20; H02K2205/00; H02K2205/12; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49009; Y10T29/49012; Y10T29/49826; Y10T29/49895; Y10T29/49901; Y10T29/53; Y10T29/5313; Y10T29/53143

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 174 words
A method for constructing a disk lamination for the rotor of a homopolar or switched reluctance magnetic machine comprising: (a) providing a magnetic portion of a disk lamination having an interior core portion of uniform thickness and a plurality of pole pieces extending generally outward therefrom along respective radial lines so as to define an outer circumferential disk edge and form an interpole space, respectively, between each adjacent pair of said pole pieces, respectively; (b) inserting the magnetic portion in a jig, the jig comprising a plurality of tables corresponding geometrically in location and configuration to the plurality of interpole spaces; (c) positioning the magnetic portion such that the pole pieces are position®d between the plurality of tables; (d) guiding a non-magnetic segment, respectively, into each interpole space, respectively, by sliding said segment along the top of the table until angularly opposed edges of the non-magnetic segment abut respective adjacent edges of the pole pieces adjacent thereto; and (e) bonding the edges of the pole pieces to the abutting edges of the non-magnetic segments.
Claim 2
Independent Claim 174 words
A method for constructing a disk lamination for the rotor of a homopolar or switched reluctance magnetic machine comprising: (a) providing a magnetic portion of a disk lamination having an interior core portion of uniform thickness and a plurality of pole pieces extending generally outward therefrom along respective radial lines so as to define an outer circumferential disk edge and form an interpole space, respectively, between each adjacent pair of said pole pieces, respectively; (b) inserting the magnetic portion in a jig, the jig comprising a plurality of tables corresponding geometrically in location and configuration to the plurality of interpole spaces; (c) positioning the magnetic portion such that the pole pieces are position®d between the plurality of tables; (d) guiding a non-magnetic segment, respectively, into each interpole space, respectively, by sliding said segment along the top of the table until angularly opposed edges of the non-magnetic segment abut respective adjacent edges of the pole pieces adjacent thereto; and (e) bonding the edges of the pole pieces to the abutting edges of the non-magnetic segments.
Claim 3
Dependent Claim 30 words
The method of claim 1 wherein the step of bonding comprises joining the edges of the pole pieces to the abutting edges of the non-magnetic segments by laser beam welding.
Claim 4
Dependent Claim 29 words
The method of claim 1 wherein the step of bonding comprises joining the edges of the pole pieces to the abutting edges of the non-magnetic segments by electron-beam welding.
Claim 5
Dependent Claim 30 words
The method of claim 1 wherein the step of bonding comprises joining the edges of the pole pieces to the abutting edges of the non-magnetic segments by robotic index welding.
Claim 6
Dependent Claim 27 words
The method of claim 1 wherein the thickness of the non-magnetic segments is less than the thickness of the magnetic portion, as measured in the axial direction.

References Cited (Backward Citations)

US4597172A Cited
US4472651A Cited
US4729160A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1993-04-23 1993-10-23 1994-04-24 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1997-04-23 1997-10-23 1998-04-24 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2001-04-23 2001-10-23 2002-04-24 $7700.00 Window Closed / Lapsed

Assigned Categories & Tags

No categories assigned to this patent yet.

Assign Category Tag