US3711762A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyphase transformer for a variable speed constant frequency system
Assignee: Bendix Corp
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Filing: 1971-03-02
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Granted: 1973-01-16
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Expires: 1991-03-02
Abstract
Abstract A transformer provides n phase outputs from m phase input voltages and comprises a core of magnetically permeable material having two shells connected by symmetrically arranged teeth. The number of teeth is a multiple of m, the number of phase voltages and of n the number of phase outputs. Wound on the teeth are m primary windings symmetrically arranged and each primary winding is energized by a phase voltage. n secondary windings are arranged on the core so that an output voltage is induced in each secondary winding and the secondary windings are positioned relative to one another in accordance with the desired phase angle separation of the outputs.
Inventors
- 👤 R Eckenfelder
- 👤 R Kautz
- 👤 A Compoly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:33
CPC Classifications
H; H01; H01F; H01F30/00; H01F30/06; H01F30/12; H01F30/14
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
179 words
A transformer for providing n phase outputs from m phase voltages where m > OR = 2n, comprising a core of magnetically permeable material having two shells connected by spaced teeth therebetween, the number of teeth being a multiple of m the number of phase voltages and of n the number of phase outputs, m primary windings wound on the teeth and each primary winding being energized by a phase voltage, the primary windings being arranged on the teeth to induce flux in the core corresponding to the vector sum of the voltages, and n secondary windings wound on the core and each secondary winding subtending a number of teeth equal to the number of teeth divided by n the number of secondary windings and each tooth being subtended by only one secondary winding, the secondary windings being relatively positioned on the core in accordance with the desired phase angle separation of the outputs and each secondary winding providing an output corresponding to the vector sum of the flux in the portion of, the core subtended by the winding.
Claim 2
Dependent Claim
179 words
A transformer for providing n phase outputs from m phase voltages where m > OR = 2n, comprising a core of magnetically permeable material having two shells connected by spaced teeth therebetween, the number of teeth being a multiple of m the number of phase voltages and of n the number of phase outputs, m primary windings wound on the teeth and each primary winding being energized by a phase voltage, the primary windings being arranged on the teeth to induce flux in the core corresponding to the vector sum of the voltages, and n secondary windings wound on the core and each secondary winding subtending a number of teeth equal to the number of teeth divided by n the number of secondary windings and each tooth being subtended by only one secondary winding, the secondary windings being relatively positioned on the core in accordance with the desired phase angle separation of the outputs and each secondary winding providing an output corresponding to the vector sum of the flux in the portion of, the core subtended by the winding.
Claim 3
Dependent Claim
21 words
A transformer as described in claim 1 in which the core is circular and the shells are separated by the teeth.
Claim 4
Dependent Claim
20 words
A transformer as described in claim 2 in which the teeth are positioned substantially radially and the shells are concentric.
Claim 5
Dependent Claim
29 words
A transformer as described in claim 1 in which the number of teeth equal m the number of phase voltages and a primary winding is wound on each tooth.
Claim 6
Dependent Claim
28 words
A transformer as described in claim 1 in which the core has apertures between the teeth and the primary windings are wound about the teeth through the apertures.
Claim 7
Dependent Claim
33 words
A transformer of the kind described in claim 1 in which the shells are continuous and magnetic flux is induced in the shells by energization of the primary windings by the phase voltages.
Claim 8
Dependent Claim
29 words
A transformer as described in claim 2 in which the cross sectional area of the one shell is substantially equal to the cross sectional area of the other shell.
Claim 9
Dependent Claim
19 words
A transformer as described in claim 7 in which the induced magnetic flux in the shells is substantially equal.
Claim 10
Dependent Claim
33 words
A transformer of the kind described in claim 7 in which the shell cross sectional area is substantially twice the cross sectional area of a tooth so that the flux density is balanced.
Claim 11
Dependent Claim
25 words
A transformer as described in claim 9 in which the induced magnetic flux in the shells is approximately twice the flux in any one tooth.
Claim 12
Dependent Claim
34 words
A transformer as described in claim 2 in which the secondary windings are wound on the core about one of the shells and are arranged in accordance with the phase separation of the outputs.
Claim 13
Dependent Claim
32 words
A transformer as described in claim 1 in which the secondary windings are wound on the core and subtend a number of teeth corresponding to the phase angle separation of the outputs.
Claim 14
Dependent Claim
45 words
A transformer as described in claim 5 in which the core is circular and the secondary windings are wound about one of the shells through the apertures and the windings are arranged on the core in accordance with the phase angle separation of the outputs.
Claim 15
Dependent Claim
45 words
A transformer as described in claim 5 in which the core is circular and each secondary winding is wound on the core through two apertures angularly spaced from one another in accordance with the angular phase separation of the outputs and subtend the teeth therebetween.
Claim 16
Dependent Claim
45 words
A transformer as described in claim 5 in which the core is triangular and each secondary winding is wOund on the core through two apertures angularly spaced from one another in accordance with the angular phase separation of the outputs and subtend the teeth therebetween.
Claim 17
Dependent Claim
28 words
A transformer as described in claim 1 in which the shells are substantially triangular and are positioned substantially parallel to one another and are separated by the teeth.
Claim 18
Dependent Claim
18 words
A transformer as described in claim 16 in which the teeth are positioned substantially perpendicularly to the shells.
Claim 19
Dependent Claim
14 words
A transformer as described in claim 16 in which the shells are substantially identical.
Claim 20
Dependent Claim
19 words
A transformer as described in claim 18 in which the induced magnetic flux in the shells is substantially equal.
Claim 21
Dependent Claim
18 words
A transformer as described in claim 1 in which the primary windings are symmetrically distributed on the core.
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) | 1976-01-16 | 1976-07-17 | 1977-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-16 | 1980-07-17 | 1981-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-16 | 1984-07-17 | 1985-01-16 | $7700.00 | Window Closed / Lapsed |