Patent EP0143693A2 successfully refreshed from Google Patents.
EP0143693A2
Expired / Lapsed
EP
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Rotor for electric motor
Assignee: Franklin Electric Co Inc
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Filing: 1984-11-14
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Granted: —
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Expires: 2004-11-14
Abstract
Abstract This disclosure relates to a rotor for a permanent magnet electric motor, including a stack of rotor laminations, the stack being generally cylindrical and adapted to be secured to a rotor shaft. A plurality of arcuate permanent magnets are positioned on the peripheral surface of the stack, the magnets being circumferentially spaced to form gaps between the adjacent side edges of the magnets. Interconnecting anchors between the laminations and the side edges are provided to secure the magnets to the stack of laminations. The rotor is made by utilizing parts that are normally discarded during the construction of the motor stator. The stator includes a stack of stator laminations, each lamination having the centerpiece thereof removed by a stamping operation for the rotor cavity. The removed centerpieces, which are normally discarded, have the rotor laminations stamped from it. After the latter stamping operation, the rotor laminations are stacked, secured to permanent magnets and mounted on a rotor shaft.
Inventors
- 👤 Edward J. Schaefer
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 17:00
CPC Classifications
H; H02; H02K; H02K1/00; H02K1/06; H02K1/22; H02K1/27; H02K1/2706; H02K1/272; H02K1/274; H02K1/2753; H02K1/278
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
82 words
A permanent magnet rotor for an electric motor, comprising a cylindrical stack (21) of rotor laminations (22), a plurality of arcuate permanent magnets (32-35) positioned on the outer periphery of said stack (21), characterized in that said magnets are circumferentially spaced and said spacing results in gaps (41) between adjacent sides of said magnets, and further including anchor means (44) in said gaps and connected to said stack and to said magnets at said sides for securing said magnets to said stack.
Claim 2
Dependent Claim
82 words
A permanent magnet rotor for an electric motor, comprising a cylindrical stack (21) of rotor laminations (22), a plurality of arcuate permanent magnets (32-35) positioned on the outer periphery of said stack (21), characterized in that said magnets are circumferentially spaced and said spacing results in gaps (41) between adjacent sides of said magnets, and further including anchor means (44) in said gaps and connected to said stack and to said magnets at said sides for securing said magnets to said stack.
Claim 3
Dependent Claim
50 words
Apparatus as in Claim 1, wherein said anchor means comprises a slot (31) formed in said stack (21) adjacent each of said gaps (41), each slot (31) generally underlying the associated gap, and means (44) extending into each associated slot and gap and interconnecting said stack with said side edges.
Claim 4
Dependent Claim
14 words
Apparatus as in Claim 2, wherein said last named means comprises a filling material.
Claim 5
Dependent Claim
14 words
Apparatus as in Claim 3, wherein said filling material comprises a cast nonferrous metal.
Claim 6
Dependent Claim
17 words
Apparatus as in Claim 3, wherein said filling material comprises a structural adhesive having void filling properties.
Claim 7
Dependent Claim
22 words
Apparatus as in Claim 2, wherein said last named means comprises a metal strip (61) extending into said slot and said gap.
Claim 8
Dependent Claim
18 words
Apparatus as in Claim 6, wherein said last named means further comprises a filling material in said gap.
Claim 9
Dependent Claim
28 words
Apparatus as in Claim 6, wherein said metal strip includes a plurality of circumferentially extending elastic tabs (63, 64) which interlock with said magnets and with said stack.
Claim 10
Dependent Claim
14 words
Apparatus as in Claim 6, wherein said metal strip further secures together said laminations.
Claim 11
Dependent Claim
18 words
Apparatus as in Claim 2, wherein the radially outer corners of said side edges flare radially and circumferentially.
Claim 12
Dependent Claim
32 words
Apparatus as in Claim 1, wherein said anchor means comprises a projection (78, 97) formed on said stack adjacent each of said gaps, each projection extending radially outwardly into the associated gap.
Claim 13
Dependent Claim
26 words
Apparatus as in Claim 11, wherein said anchor means further comprises filling material (81, 98) in each gap around said projection and against said side edges.
Claim 14
Dependent Claim
17 words
Apparatus as in Claim 12, wherein said filling material comprises a structural adhesive having void filling properties.
Claim 15
Dependent Claim
14 words
Apparatus as in Claim 12, wherein said filling material comprises a cast nonferrous metal.
Claim 16
Dependent Claim
16 words
Apparatus as in Claim 11, wherein said projection is circumferentially enlarged adjacent its radially outer end.
Claim 17
Dependent Claim
24 words
Apparatus as in Claim 1, and further including an adhesive between the outer surface of said stack and the inner surfaces of said magnets.
Claim 18
Dependent Claim
23 words
Apparatus as in Claim 3, wherein said filling material extends axially out of the ends of said slots and overlies the endmost laminations.
Claim 19
Dependent Claim
17 words
Apparatus as in Claim 17, wherein said axially extended filling material further comprises a fan blade 128.
Claim 20
Dependent Claim
17 words
Apparatus as in Claim 17, wherein said filling material further overlies the ends of said permanent magnets.
Claim 21
Independent Claim
102 words
A method of making a motor having a stator and a rotor, comprising the steps of forming a stack (10) of stator laminations by shaping individual stator laminations from a sheet or strip of lamination material and securing said stator laminations together in a stack (10), said shaping of each stator lamination resulting in a centerpiece (13) that is removed to form a rotor cavity (12), characterized by the steps of shaping each centerpiece (13) to produce a rotor lamination (22), arranging said rotor laminations (22) to form a stack (21), and securing permanent magnets (32-35) to said stack of rotor laminations.
Claim 22
Independent Claim
102 words
A method of making a motor having a stator and a rotor, comprising the steps of forming a stack (10) of stator laminations by shaping individual stator laminations from a sheet or strip of lamination material and securing said stator laminations together in a stack (10), said shaping of each stator lamination resulting in a centerpiece (13) that is removed to form a rotor cavity (12), characterized by the steps of shaping each centerpiece (13) to produce a rotor lamination (22), arranging said rotor laminations (22) to form a stack (21), and securing permanent magnets (32-35) to said stack of rotor laminations.
Claim 23
Dependent Claim
20 words
The method of Claim 20, wherein said centerpieces and said rotor laminations are formed by at least one stamping operation.
Claim 24
Dependent Claim
39 words
The method of Claim 20, wherein said magnets are arranged at circumferentially spaced locations to form gaps therebetween, and said magnets are secured to said rotor stack by the step of casting a filling material (44) in said gaps.
Claim 25
Dependent Claim
31 words
The method of Claim 20, wherein said step of shaping said centerpieces and securing said magnets to said rotor stack includes forming anchor means between said rotor stack and said magnets.
References Cited (Backward Citations)
No citation records indexed.
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