US4358697A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two-pole permanent magnet synchronous motor rotor
Assignee: Siemens Energy and Automation Inc
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Filing: 1981-08-19
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Granted: 1982-11-09
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Expires: 2001-08-19
Abstract
Abstract A permanent magnet rotor configuration which produces two magnetic poles. Two pairs of axial slots are provided in which permanent magnets are arranged about the rotor shaft. A third, diametrically opposed pair of slots is provided which extend radially outwardly and in which permanent magnets are disposed. Off-axis magnetic bridges are formed on either side of the third slots, separating them from the first and second sets of slots.
Inventors
- 👤 Joseph C. Liu
- 👤 Paul D. Wagner
- 👤 John J. Keuper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:51
CPC Classifications
H; H02; H02K; H02K1/00; H02K1/06; H02K1/22; H02K1/27; H02K1/2706; H02K1/272; H02K1/274; H02K1/2753; H02K1/276; H02K1/2766; H02K21/00; H02K21/46
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
226 words
A two pole rotor for a permanent magnet synchronous motor comprising: a plurality of magnetic laminations aligned to form a rotor body, said laminations having openings which align to define (i) a set of rotor bar slots disposed about the periphery of the rotor body; (ii) a central opening extending axially through said rotor body to define a shaft opening; (iii) first and second pairs of magnet slots disposed symmetrically about said central opening, the slots of each pair being separated by a bridge of magnetic material formed integrally with said laminations, said bridges being 180° apart, each of said magnet slots comprising at least two straight segments disposed generally parallel to lines tangent to the periphery of said central opening, and (iv) a third pair of magnetic slots lying along a common diametrical line displaced 90° from said magnetic bridges, each one of said third pair of slots extending radially outwardly to a point close to the periphery of said rotor body and inwardly to a point between the ends of the magnet slots of said first and second pair of slots; and a plurality of permanent magnets disposed in said magnet slots, said bridges aligning with the direct axis of a motor stator when rotor is placed therein and said third pair of magnet slots is aligned with the quadature axis of said stator.
Claim 2
Dependent Claim
226 words
A two pole rotor for a permanent magnet synchronous motor comprising: a plurality of magnetic laminations aligned to form a rotor body, said laminations having openings which align to define (i) a set of rotor bar slots disposed about the periphery of the rotor body; (ii) a central opening extending axially through said rotor body to define a shaft opening; (iii) first and second pairs of magnet slots disposed symmetrically about said central opening, the slots of each pair being separated by a bridge of magnetic material formed integrally with said laminations, said bridges being 180° apart, each of said magnet slots comprising at least two straight segments disposed generally parallel to lines tangent to the periphery of said central opening, and (iv) a third pair of magnetic slots lying along a common diametrical line displaced 90° from said magnetic bridges, each one of said third pair of slots extending radially outwardly to a point close to the periphery of said rotor body and inwardly to a point between the ends of the magnet slots of said first and second pair of slots; and a plurality of permanent magnets disposed in said magnet slots, said bridges aligning with the direct axis of a motor stator when rotor is placed therein and said third pair of magnet slots is aligned with the quadature axis of said stator.
Claim 3
Dependent Claim
43 words
A rotor according to claim 1, wherein said inwardly-extending ends of said third pair of magnetic slots are spaced from the adjacent ends of magnet slots to define a pair of magnetic bridges disposed at an acute angle to said common diametrical line.
Claim 4
Dependent Claim
33 words
A rotor according to claim 2, wherein the sides of the inner ends of said third pair of slots converge toward a point disposed radially inwardly of said first and second magnet slots.
Claim 5
Dependent Claim
23 words
A rotor according to claim 3, wherein said portion of said third pair of slots having converging walls is filled with cast metal.
Claim 6
Dependent Claim
14 words
A rotor according to claim 4, wherein said cast metal exhibits low magnetic permeability.
Claim 7
Dependent Claim
29 words
A rotor according to claim 5, wherein each one of said third pair of slots contains at least two generally rectangular permanent magnets of a common size and shape.
Claim 8
Dependent Claim
30 words
A rotor according to claim 1, further comprising at least two holes extending axially therethrough and disposed in an area between said third magnet slots and a rotor bar slot.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-11-08 | 1986-05-10 | 1986-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-08 | 1990-05-10 | 1990-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-08 | 1994-05-10 | 1994-11-09 | $7700.00 | Window Closed / Lapsed |