US5410203A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reluctance motor with yoke saturation
Assignee: US Philips Corp
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Filing: 1994-02-25
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Granted: 1995-04-25
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Expires: 2014-02-25
Abstract
Abstract The invention relates to a reluctance motor having a ferromagnetic stationary member (3) and a ferromagnetic member (5) which is movable relative thereto, which exhibit an air gap (4) between spaced-apart pole faces (3c, 5c) of salient pole parts (3b, 5b), one of the members being provided with excitation coils, which surround ferromagnetic cores (3a, 5a) providing a ferromagnetic coupling between the pole parts of this member, the ferromagnetic cores being dimensioned to have such cross-sections that during the magnetisation of these cores by the excitation current the cores are magnetically saturated at the same time as the salient pole parts.
Inventors
- 👤 Peter Lurkens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:28
CPC Classifications
H; H02; H02K; H02K19/00; H02K19/02; H02K19/04; H02K19/06; H02K19/10; H02K19/103
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
137 words
A reluctance motor having a ferromagnetic stationary member and a ferromagnetic movable member, the ferromagnetic stationary and movable members each comprising two salient pole parts and a core providing a magnetic flux path between the two salient pole parts, one of the members being provided with excitation coils for receiving an excitation current to generate magnetic flux, the salient pole parts of the members becoming momentarily aligned with each other during movement of the movable member so as to momentarily form a ferromagnetic coupling for the generated magnetic flux to flow through both members in a closed path, characterized in that the cores and salient pole parts are dimensioned to have such cross-sections that during the ferromagnetic coupling of the members the cores and the salient pole parts all become magnetically saturated at substantially a same time.
Claim 2
Dependent Claim
137 words
A reluctance motor having a ferromagnetic stationary member and a ferromagnetic movable member, the ferromagnetic stationary and movable members each comprising two salient pole parts and a core providing a magnetic flux path between the two salient pole parts, one of the members being provided with excitation coils for receiving an excitation current to generate magnetic flux, the salient pole parts of the members becoming momentarily aligned with each other during movement of the movable member so as to momentarily form a ferromagnetic coupling for the generated magnetic flux to flow through both members in a closed path, characterized in that the cores and salient pole parts are dimensioned to have such cross-sections that during the ferromagnetic coupling of the members the cores and the salient pole parts all become magnetically saturated at substantially a same time.
Claim 3
Dependent Claim
18 words
A reluctance motor as defined in claim 1 wherein the stationary member is provided with the excitation coils.
Claim 4
Dependent Claim
47 words
A reluctance motor as defined in claim 2 wherein the movable member is a rotor, the stationary member is a stator, the core of the stationary member is at least one yoke of the stator, and the salient pole parts are teeth of the rotor and stator.
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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) | 1998-04-24 | 1998-10-24 | 1999-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-04-24 | 2002-10-24 | 2003-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-04-24 | 2006-10-24 | 2007-04-25 | $7700.00 | Window Closed / Lapsed |