US4780659A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High-power, high-voltage direct current power source
Assignee: Sundstrand Corp
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Filing: 1987-04-01
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Granted: 1988-10-25
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Expires: 2007-04-01
Abstract
Abstract A high-power, high-voltage DC power supply includes a plurality of AC generators, each of which includes a rotor and one or more sets of armature windings wherein the rotors are linked together. A plurality of rectifiers are connected together in series and the armature windings are connected to the rectifiers such that each rectifier produces a fractional voltage which is combined with the fractional voltage developed by other rectifiers to develop a combined output voltage across all of the rectifiers. The armature windings are placed relative to one another such that a plurality of equally-spaced ripple peaks appear in the combined output voltage for each 360° of each armature winding voltage. This in turn minimizes ripple magnitude leading to a desirable decrease in the overall power supply size and weight.
Inventors
- 👤 Madan L. Bansal
- 👤 Alexander Krinickas, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:01
CPC Classifications
H; H02; H02K; H02K19/00; H02K19/16; H02K19/34; H02J; H02J1/00; H02J1/02; H02K16/00; H02K21/00; H02K21/48; H02P; H02P25/00; H02P25/16; H02P25/22; H02P9/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
151 words
A DC generator, comprising: N AC generators each having a rotor which develops a magnetic field and a stator having M stator windings, the rotors being mechanically linked to rotate together in response to motive power supplied by a prime mover to thereby induce AC voltages in the M×N stator windings; and M×N series-connected rectifiers coupled to the outputs of the M×N stator windings, each rectifier developing a fractional voltage which is added to the fractional voltages developed by the other rectifiers to generate a combined output voltage, wherein the rectifiers include a midpoint connected to ground potential so that the combined output voltage is substantially centered about ground potential; whereby the stator windings are physically disposed with respect to one another such that an integer multiple of M×N equally-spaced ripple peaks appear in the combined output voltage for each 360 degrees in the AC voltage induced in a stator winding.
Claim 2
Dependent Claim
151 words
A DC generator, comprising: N AC generators each having a rotor which develops a magnetic field and a stator having M stator windings, the rotors being mechanically linked to rotate together in response to motive power supplied by a prime mover to thereby induce AC voltages in the M×N stator windings; and M×N series-connected rectifiers coupled to the outputs of the M×N stator windings, each rectifier developing a fractional voltage which is added to the fractional voltages developed by the other rectifiers to generate a combined output voltage, wherein the rectifiers include a midpoint connected to ground potential so that the combined output voltage is substantially centered about ground potential; whereby the stator windings are physically disposed with respect to one another such that an integer multiple of M×N equally-spaced ripple peaks appear in the combined output voltage for each 360 degrees in the AC voltage induced in a stator winding.
Claim 3
Dependent Claim
67 words
The DC generator of claim 1, wherein the rectifiers may be of either the full-wave or half-wave type and each induced stator winding voltage is displaced an integer multiple of 360/(M×Z) electrical degrees with respect to the induced voltage in the other stator windings of the same generator, where Z equals 1 or 2 depending upon whether the rectifiers are of the half-wave or full-wave type, respectively.
Claim 4
Dependent Claim
14 words
The DC generator of claim 2, wherein the rectifiers are of the full-wave type.
Claim 5
Dependent Claim
72 words
The DC generator of claim 1, wherein each stator winding of each AC generator corresponds to a stator winding of the other AC generators and wherein the voltage induced in each stator winding is displaced an integer multiple of 360/(M×N×Z) electrical degrees with respect to the induced voltage in the corresponding stator windings, where Z equals 1 or 2 depending upon whether the rectifiers are of the half-wave or full-wave type, respectively.
Claim 6
Dependent Claim
145 words
A DC generator, comprising: N AC generators each having a rotor which develops a magnetic field and a stator having M stator winding sets, the rotors being mechanically linked to rotate together in response to motive power supplied by a prime mover to thereby induce AC voltages in the M×N stator winding sets wherein each stator winding set includes P phase windings; and M×N series-connected rectifiers coupled to the outputs of the M×N stator winding sets, each rectifier developing a fractional voltage which is added to the fractional voltages developed by the other rectifiers to generate a combined output voltage; whereby the stator winding sets are physically disposed with respect to one another such that an integer multiple of M×N×P equally-spaced ripple peaks appear in the combined output voltage for each 360° of the AC voltage induced in a phase winding of a winding set.
Claim 7
Dependent Claim
145 words
A DC generator, comprising: N AC generators each having a rotor which develops a magnetic field and a stator having M stator winding sets, the rotors being mechanically linked to rotate together in response to motive power supplied by a prime mover to thereby induce AC voltages in the M×N stator winding sets wherein each stator winding set includes P phase windings; and M×N series-connected rectifiers coupled to the outputs of the M×N stator winding sets, each rectifier developing a fractional voltage which is added to the fractional voltages developed by the other rectifiers to generate a combined output voltage; whereby the stator winding sets are physically disposed with respect to one another such that an integer multiple of M×N×P equally-spaced ripple peaks appear in the combined output voltage for each 360° of the AC voltage induced in a phase winding of a winding set.
Claim 8
Dependent Claim
68 words
The DC generator of claim 5, wherein the rectifiers may be of either the full-wave or half-wave type and the voltage induced in each phase winding is displaced an integer multiple of 360/(M×P×Z) electrical degrees with respect to the voltage induced in corresponding phase windings of the same generator, where Z equals 1 or 2 depending upon whether the rectifiers are of the half-wave or full-wave type, respectively.
Claim 9
Dependent Claim
14 words
The DC generator of claim 6, wherein the rectifiers are of the full-wave type.
Claim 10
Dependent Claim
75 words
The DC generator of claim 5, wherein each phase winding of each winding set corresponds to a phase winding of the other generators and wherein the voltage induced in each phase winding is displaced an integer multiple of 360/(M×N×P×Z) electrical degrees with respect to the induced voltage in the corresponding phase windings of the other generators, where Z equals 1 or 2 depending upon whether the rectifiers are of the half-wave or full-wave type, respectively.
References Cited (Backward Citations)
US2945141A
Cited
US3340448A
Cited
US3421071A
Cited
US3558904A
Cited
US3459980A
Cited
US3784894A
Cited
US4339704A
Cited
US4663581A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1991-10-25 | 1992-04-25 | 1992-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-10-25 | 1996-04-25 | 1996-10-25 | $3760.00 | Window Closed / Lapsed |
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