US4358696A
Expired / Lapsed
US
⏱️ 0.0 years remaining
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 four magnetic poles utilizing two sets of symmetrically-disposed permanent magnets. The slots carrying the magnets exhibit a truncated V-shaped configuration, extending from points on the periphery of the rotor to meet the ends of a straight, central portion which lies parallel to a tangent to the rotor shaft. A short magnetic bridge interrupts the center of each slot, the slots being disposed generally symmetrically upon opposite sides of the rotor shaft.
Inventors
- 👤 Joseph C. Liu
- 👤 Paul D. Wagner
- 👤 John J. Keuper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:41
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: 7
Claim 1
Independent Claim
172 words
A four-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 in an arc about the periphery of the rotor body; (ii) a central opening extending axially through said rotor body to define a shaft opening; and (iii) first and second sets of elongae slots disposed symmetrically upon opposite sides of said rotor shaft opening, each elongate slot having a central portion extending parallel to a line tangent to said shaft opening and end portions extending generally along radii of the rotor body and interleaved generally aligned with said rotor bar slots; said central portions of said elongate slots lying parallel to one another and being interrupted by a magnetic bridge extending substantially in the center thereof, each of said bridges being integrally formed with said laminations; and a plurality of rare earth permanent magnets disposed in said central and end portions of said elongate slots.
Claim 2
Dependent Claim
172 words
A four-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 in an arc about the periphery of the rotor body; (ii) a central opening extending axially through said rotor body to define a shaft opening; and (iii) first and second sets of elongae slots disposed symmetrically upon opposite sides of said rotor shaft opening, each elongate slot having a central portion extending parallel to a line tangent to said shaft opening and end portions extending generally along radii of the rotor body and interleaved generally aligned with said rotor bar slots; said central portions of said elongate slots lying parallel to one another and being interrupted by a magnetic bridge extending substantially in the center thereof, each of said bridges being integrally formed with said laminations; and a plurality of rare earth permanent magnets disposed in said central and end portions of said elongate slots.
Claim 3
Dependent Claim
43 words
A rotor according to claim 1 wherein said magnets exhibit a generally rectangular cross section, forming interstices between magnets in said central and said end portions of said elongate slots, and non-magnetic metal disposed in said interstices and in said rotor bar slots.
Claim 4
Dependent Claim
15 words
A rotor according to claim 2 wherein said magnets are all of the same size.
Claim 5
Dependent Claim
19 words
A rotor according to claim 1, wherein said end portions of said elongate slots are disposed substantially 90° apart.
Claim 6
Dependent Claim
33 words
A rotor according to claim 1, wherein said end portions of said elongate slots exhibit a dimension in a radial direction which is longer than the radial depth of said rotor bar slots.
Claim 7
Dependent Claim
17 words
A rotor according to claim 1, wherein all of said magnets are of a single, common size.
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 |