Patent EP0017311A2 successfully refreshed from Google Patents.
EP0017311A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Improvements in electric machines
Assignee: Card O Matic Pty Ltd
•
Filing: 1980-02-04
•
Granted: —
•
Expires: 2000-02-04
Abstract
Abstract An electric machine, such as an induction motor, having a rotor (17) and stator core (20) formed of metal strip (21) coiled about a centrally longitudinal axis (38) extending generally normal to the plane of the strip (21), and wherein the strip (21) is provided with depressions (24) on longitudinally spaced locations along the length of the strip so as to enable coiling of the strip about said axis.
Inventors
- 👤 Louis Stanley
- 👤 Jacqualyne Stanley
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 18:53
CPC Classifications
H; H02; H02K; H02K1/00; H02K1/06; H02K1/12; H02K1/16; H02K15/00; H02K15/02; H02K15/021; H02K15/026
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
58 words
A core for an electric machine, said core being formed of a stacked metal strip coiled about a central longitudinal axis which extends generally normal to the plane of the strip, and wherein said strip is deformed at longitudinally spaced locations along the length of the strip so as to enable coiling of the strip about said axis.
Claim 2
Dependent Claim
58 words
A core for an electric machine, said core being formed of a stacked metal strip coiled about a central longitudinal axis which extends generally normal to the plane of the strip, and wherein said strip is deformed at longitudinally spaced locations along the length of the strip so as to enable coiling of the strip about said axis.
Claim 3
Dependent Claim
17 words
The core of claim 1 wherein said deformations are depressions extending from the plane of the strip.
Claim 4
Dependent Claim
41 words
The core of claim 2 wherein said depressions are of a longitudinal width extending in the direction of the strip which decreases towards the radially outer edge of the strip, and are located adjacent the radially inner edge of the strip.
Claim 5
Dependent Claim
27 words
The core of claims 2 or 3 wherein the depressions are equally spaced longitudinally of the strip so that the core is of a generally cylindrical shape.
Claim 6
Dependent Claim
36 words
The core of claims 2 or 3 wherein the depressions are spaced by an increasing distance along the strip so that the strip follows a spiral path and said core is of a generally frusto-conical shape.
Claim 7
Dependent Claim
28 words
The core of claim 5 wherein the depth of said depressions decreases from the smaller radius end of said core to the largest radius end of said core.
Claim 8
Dependent Claim
55 words
A stator for an electric machine, said stator including the core of any one of claims 1 to 6 wherein said core has a plurality of slots on its radially inner peripheral surface, which slots are defined by recesses punched in said strip and aligned on the core, and field windings extending through said slots.
Claim 9
Dependent Claim
37 words
An electric motor having the stator of claim 7, a motor including a core according to any one of claims 1 to 6, and fastening means to retain the stator and rotor cores in a coiled state.
Claim 10
Dependent Claim
11 words
The motor of claim 8 when constructed as an induction motor.
Claim 11
Dependent Claim
66 words
A generator having the stator of claim 7, a rotor having a core according to any one of claims 1 to 6, the rotor core having a plurality of slots on its radially outer peripheral surface, which rotor slots are defined by recesses punched in the strip forming the rotor core and aligned on the rotor core, and an armature winding extending through the rotor slots.
Claim 12
Independent Claim
53 words
A method of forming a core for an electric machine, said method including the steps of: (a) deforming a metal strip at longitudinally spaced locations along the strip to cause the strip to coil about a longitudinal axis generally normal to the plane of the strip; and (b) stacking the coils of strip.
Claim 13
Independent Claim
53 words
A method of forming a core for an electric machine, said method including the steps of: (a) deforming a metal strip at longitudinally spaced locations along the strip to cause the strip to coil about a longitudinal axis generally normal to the plane of the strip; and (b) stacking the coils of strip.
Claim 14
Dependent Claim
31 words
The method of claim 11 wherein the deformations are depressions in the strip formed by punching the strip, and said depressions are formed adjacent the radially inner edge of the strip.
Claim 15
Dependent Claim
32 words
The method of claim 11 wherein said depressions are formed to have a width extending in the direction of the strip, which width decreases toward the radially outer edge of the strip.
Claim 16
Independent Claim
28 words
The method of any one of claims 11 to 13 wherein the deformations are equally spaced along the strip so that the core is substantially of cylindrical shape.
Claim 17
Independent Claim
43 words
The method of any one of claims 11 to 13 wherein the spaces between the deformations continually increase in length to thereby cause said strip to follow a spiral path and so that said core is formed to have a generally frusto-conical shape.
Claim 18
Independent Claim
47 words
The method of any one of claims 11 to 15 further including the step of punching recesses in the strip at spaced locations along the strip so that the recesses align on the coiled core to form longitudinally extending slots on a peripheral surface of the core.
Claim 19
Dependent Claim
33 words
The method of claim 16 wherein the recesses are punched on the radially inner edge of the strip so as to form the slots on the radially inner peripheral surface of the core.
Claim 20
Dependent Claim
34 words
The method of claim 16 wherein the recesses are punched on the radially outer peripheral surface of the strip so as to form the slots on the radially outer peripheral surface of the core.
Claim 21
Dependent Claim
55 words
A method of manufacturing an electric motor, said method including forming a stator having a core manufactured by the method of claim 17 and further including the step of locating field windings in the slots, and also including forming a rotor having a core manufactured by the method of any of claims 11 to 15.
Claim 22
Independent Claim
43 words
A method of manufacturing a generator, said method including forming a stator having a core manufactured by the method of any one of claims 11 to 17, and forming a rotor having a core manufactured by the method of claims 18 and 21.
Claim 23
Dependent Claim
34 words
The method of claim 19 or 20 wherein the rotor core and stator core are formed from a single metal strip, which single strip is divided longitudinally to form the rotor and stator cores.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.