EP0160522A2
Expired / Lapsed
EP
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Magnetic-pole cores for electrorotary machines
Assignee: Watanuki Takao
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Filing: 1985-04-25
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Granted: —
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Expires: 2005-04-25
Abstract
Abstract A magnetic-pole core for an electrorotary machine, such as a DC or AC motor, has pole sections (17) which extend over the side of a coil (4) from base sections (10,11). Each pole section (17) has two sub-sections or pole pieces (20 and 21) and one of these pole pieces (20) has an extended section (22) which extends circumferentially of the coil. This structure prevents the formation of a start-up dead-point by enabling the centre of the magnetic poles of the armature (which include the pole core) to deviate circumferentially from the centre of the poles, or the mid-point between poles, of a field magnet around the armature. The core also permits uniform rotation. There may also be a third pole piece (3) between the first and second pole pieces (21,22) and all the pole pieces may be integral with the base section (10,11) from which they extend.
Inventors
- 👤 Fumito Komatsu
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 14:58
CPC Classifications
H; H02; H02K; H02K21/00; H02K21/12; H02K21/14; H02K21/145; H02K21/22; H02K21/227; H02K29/00; H02K29/06; H02K29/08; H02K29/14; H02K2201/00; H02K2201/12
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
75 words
A magnetic-pole core (10,11) for an electrorotary machine having a base section (16) and a plurality of magnetic-pole sections (17) on the base section (16); characterised in that at least some of the magnetic-pole sections (17) have two subsections forming first (20) and second (21) magnetic-pole pieces, and each of the first (20) and/or second (21) such magnetic-pole pieces (20,21) has an extended section (22) extending in the circumferential direction of the base section (16).
Claim 2
Dependent Claim
75 words
A magnetic-pole core (10,11) for an electrorotary machine having a base section (16) and a plurality of magnetic-pole sections (17) on the base section (16); characterised in that at least some of the magnetic-pole sections (17) have two subsections forming first (20) and second (21) magnetic-pole pieces, and each of the first (20) and/or second (21) such magnetic-pole pieces (20,21) has an extended section (22) extending in the circumferential direction of the base section (16).
Claim 3
Dependent Claim
26 words
A magnetic-pole core according to claim 1, wherein the first (20) and second (21) magnetic-pole pieces have substantially the same height from the base section (16).
Claim 4
Dependent Claim
29 words
A magnetic-pole core according to claim 1 or claim 2, wherein the extended section (22) is approximately at the mid-point of the magnetic-pole piece to which it is connected.
Claim 5
Dependent Claim
26 words
A magnetic-pole core according to any one of claims 1 to 3, wherein the first (20) and second (21) magnetic-pole pieces are at different radial positions.
Claim 6
Dependent Claim
25 words
A magnetic-pole core according to any one of the preceding claims, having third magnetic-pole pieces (23) between the first (20) and second (21) magnetic-pole pieces.
Claim 7
Dependent Claim
31 words
A magnetic-pole core according to claim 5, wherein the third magnetic-pole pieces (23) are connected to the corresponding first (20) and second (21) magnetic-pole pieces and to the base section (16).
Claim 8
Dependent Claim
19 words
A magnetic-pole core according to claim 5, wherein the third magnetic-pole pieces are connected to a corresponding extended section.
Claim 9
Dependent Claim
19 words
A magnetic-pole core according to any one of the preceding claims, having further magnetic-pole sections which are substantially rectangular.
Claim 10
Dependent Claim
24 words
A magnetic-pole core according to any one of the preceding claims, wherein the base section (16) is integral with its corresponding magnetic-pole sections (17).
Claim 11
Dependent Claim
28 words
A magnetic-pole core according to any one of claims 1 to 8 wherein the base section (16) and its corresponding magnetic-pole sections (17) are separate pieces attached together.
Claim 12
Dependent Claim
76 words
A magnetic-pole core assembly for an electrorotary machine, having two magnetic-pole cores (10,11) according to any one of the preceding claims, with the base sections (16) of each core (10,11) on opposite sides of a concentrically-wound coil such that the magnetic-pole sections (17) of each core (10,11) extend over the outer face of the coil (14) and the magnetic-pole sections (17) of one core (10) alternate with the magnetic-pole sections (17) of the other core (11).
Claim 13
Dependent Claim
13 words
An electrorotary machine including a magnetic-pole core assembly according to claim 11. ,
References Cited (Backward Citations)
No citation records indexed.
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