EP0218477A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Rotors for A.C. synchronous motors
Assignee: Johnson Electric Industrial Manufactory Ltd
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Filing: 1986-10-02
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Granted: —
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Expires: 2006-10-02
Abstract
Abstract A permanent-magnet rotor for a a.c. synchronous electric motor, comprises at least one pair of diametrically opposed poles mounted on a rotor shaft (21). The or each pair of poles is constituted by two individual pole members (11, 12) and are held in diametrically opposed and preferably non-abutting relationship by one or more non-magnetic, preferably plastics, holding members (28, 29).
Inventors
- 👤 Georg Srobl
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 12:10
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: 14
Claim 1
Independent Claim
218 words
A permanent-magnet rotor for an a.c. synchronous electric motor, comprising at least one pair of diametrically opposed poles (11, 12) mounted on a rotor shaft (21), the or each pair of poles (11, 12) being constituted by two individual pole members (11, 12), and either a single non-magnetic holding member (16) or a pair of non-magnetic holding members (28, 29); holding the pole members (11, 12) in diametrically opposed relationship to one another, each of said pair of holding members (28, 29) or each of two parts of the single holding member (16), which two parts lie on opposite sides of an imaginary plane extending through the rotor (21) in a direction transverse to the axis thereof and midway between the ends thereof, having first, second and third integral portions, the first portions being inner portions (17; 31) which are mounted on the rotor shaft and which extend axially from respective ends of the rotor towards one another, the second portions being end portions (18) which are at opposite ends of the rotor, respectively, and which extend radially to locate the pole members (11, 12) axially relative to the shaft (21), and the third portions being peripheral portions (20; 25, 26; 30) which support the pole members (11, 12) against radially outward movement relative to the shaft (21).
Claim 2
Dependent Claim
218 words
A permanent-magnet rotor for an a.c. synchronous electric motor, comprising at least one pair of diametrically opposed poles (11, 12) mounted on a rotor shaft (21), the or each pair of poles (11, 12) being constituted by two individual pole members (11, 12), and either a single non-magnetic holding member (16) or a pair of non-magnetic holding members (28, 29); holding the pole members (11, 12) in diametrically opposed relationship to one another, each of said pair of holding members (28, 29) or each of two parts of the single holding member (16), which two parts lie on opposite sides of an imaginary plane extending through the rotor (21) in a direction transverse to the axis thereof and midway between the ends thereof, having first, second and third integral portions, the first portions being inner portions (17; 31) which are mounted on the rotor shaft and which extend axially from respective ends of the rotor towards one another, the second portions being end portions (18) which are at opposite ends of the rotor, respectively, and which extend radially to locate the pole members (11, 12) axially relative to the shaft (21), and the third portions being peripheral portions (20; 25, 26; 30) which support the pole members (11, 12) against radially outward movement relative to the shaft (21).
Claim 3
Dependent Claim
95 words
The rotor of Claim 1, wherein there is a single holding member (16), the first portions are constituted by a central holloiw core (17) receiving the rotor shaft and radial arms (19) extending from the core (17) to the periphery of the rotor (10) and separating the pole members (11, 12) of the rotor (10) from one another, and the third portions are constituted by circumferentially extending parts (30; 25, 26) joined to the radially outermost end of each radial arm (19) and extending at least part way round the circumference of the rotor (10).
Claim 4
Dependent Claim
23 words
The rotor of Claim 2, wherein the circumferentially extending parts are joined to one another (3.0) to surround the pole members (11, 12).
Claim 5
Dependent Claim
64 words
The rotor of Claim 2, wherein the outer surface of each circumferentially extending part (25, 26) has a radius of curvature equal to that of the outer surface of each pole member (11, 12) and wherein the pole members (11, 12) have projections (24) along two opposite longitudinal edges which projections projections (24) are received in coresponding grooves (27) of the circumferentially extending parts.
Claim 6
Dependent Claim
28 words
The rotor of anyone of Claims 2-4, wherein the central core of the holding member (16) has a radial flange (18) at each end constituting said second portions.
Claim 7
Dependent Claim
55 words
The rotor of Claim 1, wherein there are two holding members (28, 29) in the form of end caps having cylindrical skirts (30; 30a) constituting said third portions, which fit over opposite ends, respectively, of the pole members (11, 12), and central tubular bosses (31) constituting said first portions and receiving the rotor shaft (21).
Claim 8
Dependent Claim
42 words
The rotor of Claim 6, wherein a diametrically extending fillet (39) is mounted on the rotor shaft (21) and wherein the fillet (39) and end caps (30) have interengagable means (38, 41) for preventing axial separation of the two end caps (30).
Claim 9
Dependent Claim
24 words
The rotor of Claim 7, wherein the interengageable means comprises notches (41) in the fillet (39) and claws (38) on the end caps (30).
Claim 10
Dependent Claim
33 words
The rotor of anyone of Claims 6-8, wherein the skirts (30a) of the end caps (28, 29) meet at the outer periphery of the rotor (10) to enclose the pole members (11, 12).
Claim 11
Dependent Claim
26 words
The rotor of anyone of the preceding claims, wherein a non-magnetic shroud (34) is provided on the rotor (10) to surround the pole members (11, 12).
Claim 12
Dependent Claim
47 words
The rotor of Claim 6, wherein the skirts (30) of the two end caps (28, 29) are spaced from one another and wherein a non-magnetic shroud (34) is interposed between the skirts (30) of the two end caps (28, 29) and surrounds the pole members (11, 12).
Claim 13
Dependent Claim
24 words
The rotor of anyone of the preceding claims, wherein the holding member or members (16, 28, 29)hold the pole memberS(11, 12) in non-abutting relationship.
Claim 14
Dependent Claim
16 words
An a.c. synchronous electric motor having a rotor (10) according to anyone of the preceeding claims.
References Cited (Backward Citations)
No citation records indexed.
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