Patent US4355252A successfully refreshed from Google Patents.
US4355252A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synchronous motor
Assignee: Siemens Building Technologies AG
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Filing: 1980-05-27
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Granted: 1982-10-19
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Expires: 2000-05-27
Abstract
Abstract In a self-starting unidirectional synchronous motor which includes a stator, an exciting coil at least partly disposed within the stator, a permanent magnet type rotor which has a plurality of rotor poles and is at least partly disposed within the coil, and wherein a space is defined between the rotor and the coil, and the stator includes groups of unshaded main poles and groups of shaded auxiliary poles alternating with each other, and respective end zones are defined between adjacent groups, and each pole generates a corresponding magnetic field, the poles comprise pole arms extending into the space and include half poles disposed at least near the end zones, respectively, and wherein the groups of shaded poles are displaced with respect to the groups of non-shaded poles by respective spatial electrical angles, and the magnetic fields of groups of shaded poles are shifted with respect to groups of non-shaded poles by respective phase angles.
Inventors
- 👤 Hubert Lechner
- 👤 Benedikt Steinle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:00
CPC Classifications
H; H02; H02K; H02K21/00; H02K21/12; H02K21/14; H02K21/145; H02K2201/00; H02K2201/12
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
163 words
In a self-starting unidirectional synchronous motor including a stator, an exciting coil being at least partly disposed within said stator, a permanent magnet rotor having a plurality of rotor poles being at least partly disposed within said coil, a space being defined between said rotor and said coil, said stator including a plurality of poles, said poles including groups of unshaded main poles and groups of shaded auxiliary poles alternating with each other, respective end zones being defined between adjacent groups, each pole generating a corresponding magnetic field, said poles comprising pole arms extending into said space and including one half pole in each of said groups disposed at said end zones, respectively, and wherein groups of shaded poles are displaced with respect to groups of non-shaded poles by respective substantially equal spatial electrical angles, and the magnetic fields of groups of shaded poles are shifted with respect to the magnetic fields of groups of non-shaded poles by respective substantially equal phase angles.
Claim 2
Dependent Claim
163 words
In a self-starting unidirectional synchronous motor including a stator, an exciting coil being at least partly disposed within said stator, a permanent magnet rotor having a plurality of rotor poles being at least partly disposed within said coil, a space being defined between said rotor and said coil, said stator including a plurality of poles, said poles including groups of unshaded main poles and groups of shaded auxiliary poles alternating with each other, respective end zones being defined between adjacent groups, each pole generating a corresponding magnetic field, said poles comprising pole arms extending into said space and including one half pole in each of said groups disposed at said end zones, respectively, and wherein groups of shaded poles are displaced with respect to groups of non-shaded poles by respective substantially equal spatial electrical angles, and the magnetic fields of groups of shaded poles are shifted with respect to the magnetic fields of groups of non-shaded poles by respective substantially equal phase angles.
Claim 3
Dependent Claim
26 words
A synchronous motor as claimed in claim 1, wherein each pole comprises two pole arms which have an electrical center-to-center distance of about 90 electrical degrees.
Claim 4
Dependent Claim
40 words
A synchronous motor as claimed in claim 1, wherein said stator includes first and second end portions and wherein each end portion includes one half of said plurality of poles, one end portion being similar to the other end portion.
Claim 5
Dependent Claim
78 words
A synchronous motor as claimed in claim 1, wherein said groups of unshaded main poles comprise a first number of h main pole pairs, and said group of shaded auxiliary poles comprise a second number of s auxiliary pole pairs, and wherein the spatial angle is denoted by α, and the phase angle is denoted at ψ, said spatial angle being defined by α=arc cos (-h/s), said phase angle being defined by ψ=arc cos (=h/s), and wherein h<s.
Claim 6
Dependent Claim
17 words
A synchronous motor as claimed in claim 2, wherein each pole arm has a substantially circular cross-section.
Claim 7
Dependent Claim
33 words
A synchronous motor as claimed in claim 1, wherein each pole arm has a free end, and wherein the cross-section of the other end is greater than the cross-section of said free end.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-10-18 | 1986-04-19 | 1986-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-10-18 | 1990-04-19 | 1990-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-10-18 | 1994-04-19 | 1994-10-19 | $7700.00 | Window Closed / Lapsed |