US3564312A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Medium frequency inductor generators
Assignee: WZINA DE MASINI ELECTRICE BUCA
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Filing: 1968-10-18
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Granted: 1971-02-16
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Expires: 1988-10-18
Abstract
Abstract The operating characteristics of a medium-frequency generator of the inductor-alternator type are improved without requiring the use of a series condenser for load compensation by constructing a generator so that it includes at least the first two and preferably all of the following structural features: 1. THE NUMBER OF ARMATURE COILS IN THE ARMATURE WINDING OF THE GENERATOR IS SUCH THAT WHEN THE GENERATOR IS OPERATING UNDER OPEN CIRCUIT CONDITIONS, THE MAXIMUM OUTPUT VOLTAGE IS AT MOST EQUAL TO THE NOMINAL OR RATED OUTPUT VOLTAGE; 2. THE WIDTH OF THE PERMEANCE TEETH ON BOTH THE STATOR AND THE ROTOR IS EQUAL TO FROM 0.25T TO 0.4T, WHERE T IS THE PITCH OF THE SLOTS SEPARATING THE TEETH, I.E. THE PERIPHERAL SPACING OF A POINT ON ONE TOOTH FROM THE CORRESPONDING POINT ON THE ADJACENT TOOTH; 3. THE PERMEANCE TEETH ARE GIVEN A PROFILE WHEREBY THE WIDTH THEREOF IS CONSTANT FOR A HEIGHT WHICH IS LESS THAN THE WIDTH AND THEN RAPIDLY INCREASES FOR THE REMAINDER OF THE TOTAL HEIGHT; AND 4. THE ARMATURE WINDING CONDUCTORS, WHICH ARE MOUNTED IN SLOTS DISTRIBUTED ABOUT THE PERIPHERY OF THE STATOR ARE POSITIONED AS CLOSE TO THE AIR GAP AS POSSIBLE IN ORDER TO REDUCE THE LEAKAGE REACTANCE OF THE ARMATURE WINDING.
Inventors
- 👤 Victor Bunea
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:13
CPC Classifications
H; H02; H02K; H02K19/00; H02K19/16; H02K19/22; H02K19/24
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
291 words
An alternating-current generator of the inductor-alternator type comprising in combination: a wound stator and an unwound rotor mounted for rotation within said stator and forming an air gap therebetween; said stator haVing a plurality of field-winding slots, containing a direct current excited field winding, equally distributed about the periphery thereof facing said rotor and only one armature-winding slot located midway between each pair of field-winding slots and dividing the stator periphery therebetween into two equal sectors; each of said sectors having a plurality of equally spaced unwound slots on the periphery thereof facing said air gap, said unwound stator slots being respectively separated by permeance teeth of equal peripheral widths d, said width d, depending on the frequency of operation, being equal to from 0.25 to less than 0.4 times the pitch of said unwound stator slots; the entire periphery of said rotor being provided with equally spaced unwound slots separated by permeance teeth, said unwound rotor and stator slots being of substantially the same shape and having substantially the same angular pitch, and each of said rotor permeance teeth having a peripheral width d which, depending on the frequency of operation, is equal to from 0.25 to less than 0.4 times the pitch of said rotor peripheral slots; said stator permeance teeth being arranged such that when the stator permeance teeth of one of said sectors are aligned with said rotor permeance teeth, the stator permeance teeth on the adjacent sectors are aligned with said rotor slots; and, an armature winding contained in said armature-winding slots, the number of coils of said armature winding being such that the maximum output voltage of said generator when it is operating under open circuit conditions is at most equal to the nominal voltage.
Claim 2
Dependent Claim
291 words
An alternating-current generator of the inductor-alternator type comprising in combination: a wound stator and an unwound rotor mounted for rotation within said stator and forming an air gap therebetween; said stator haVing a plurality of field-winding slots, containing a direct current excited field winding, equally distributed about the periphery thereof facing said rotor and only one armature-winding slot located midway between each pair of field-winding slots and dividing the stator periphery therebetween into two equal sectors; each of said sectors having a plurality of equally spaced unwound slots on the periphery thereof facing said air gap, said unwound stator slots being respectively separated by permeance teeth of equal peripheral widths d, said width d, depending on the frequency of operation, being equal to from 0.25 to less than 0.4 times the pitch of said unwound stator slots; the entire periphery of said rotor being provided with equally spaced unwound slots separated by permeance teeth, said unwound rotor and stator slots being of substantially the same shape and having substantially the same angular pitch, and each of said rotor permeance teeth having a peripheral width d which, depending on the frequency of operation, is equal to from 0.25 to less than 0.4 times the pitch of said rotor peripheral slots; said stator permeance teeth being arranged such that when the stator permeance teeth of one of said sectors are aligned with said rotor permeance teeth, the stator permeance teeth on the adjacent sectors are aligned with said rotor slots; and, an armature winding contained in said armature-winding slots, the number of coils of said armature winding being such that the maximum output voltage of said generator when it is operating under open circuit conditions is at most equal to the nominal voltage.
Claim 3
Dependent Claim
56 words
The combination defined in claim 1 wherein all of said teeth separating said unwound slots have a profile such that the tip portion has a peripheral width d which is constant through a height h equal to from 0.3d to 1.0d and the remainder of the height of said teeth has a rapidly increasing peripheral width.
Claim 4
Dependent Claim
40 words
The combination defined in claim 1 wherein said armature-winding coils are mounted in armature winding said slots as close as possible to the said periphery of said stator member in order to reduce the leakage reactance of said armature winding.
Claim 5
Dependent Claim
56 words
The combination defined in claim 3, wherein the armature-winding coil carrying slots are keyshaped adjacent to said periphery and the permeance teeth bordering on said armature-winding slots have a peripheral width which is greater than said width d, and thin key is mounted in said keyshaped portion for holding the armature-winding coils in said stator member.
Claim 6
Dependent Claim
110 words
The combination defined in claim 3 wherein all of said teeth other than the teeth adjacent said peripheral slots containing said armature-winding coils are shaped so that the tip portion has a peripheral width d which is constant through a height h equal to from 0.3d to 1.0d and which then rapidly increases for the remainder of the total height of said teeth and wherein the teeth bordering on said armature-winding slots have a peripheral width which is greater than said width d of the remaining stator permeance teeth, and which is not constant for said height h but asymmetrical decreases only on the side thereof facing said armature-winding slots.
Claim 7
Dependent Claim
21 words
The combination defined in claim 4 wherein the thickness of said key is approximately equal to the height of said teeth.
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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) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |