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US 12,057,800 B2Granted
Generator systems
AssigneeHamilton Sundstrand Corporation
InventorsFrank Z. Feng, Timothy R. Pieper
Life of this patent
Estimating the term…
Abstract
A generator system can include a dual stator generator comprising a first stator and a second stator, a first rectifier operatively connected to the first stator to receive AC from the first stator, a second rectifier operatively connected to the second stator to receive AC from the second stator, and a first DC output line and a second DC output line. The first rectifier and the second rectifier can be connected in parallel to the first DC output line and a second DC output line without an inter phase transformer (IPT) to output DC to the first DC output line and the second DC output line.
Claims11
A generator system, comprising:
- a dual stator generator comprising a first stator and a second stator;
- a first rectifier operatively connected to the first stator to receive alternating current (AC) from the first stator;
- a second rectifier operatively connected to the second stator to receive AC from the second stator;
- and
- a first direct current (DC) output line and a second DC output line, wherein the first rectifier and the second rectifier are connected in parallel to the first DC output line and the second DC output line without an inter-phase transformer (IPT) to output DC to the first DC output line and the second DC output line, wherein the first stator and the second stator are sized to have a predetermined generator commutation inductance (GCI) to allow parallel DC connection without the IPT;
- wherein the first stator and the second stator each have three phases;
- wherein the first rectifier and the second rectifier have a 30° phase shift therebetween;
- wherein the GCI is selected to be approximately equal to or above a critical commutation inductance Lc;
- and
- wherein the critical commutation inductance Lc is defined as:
- Lc
- =
- 9
-
- (
- 2
-
- 3
- -
- 3
- )
- 3
-
- 2
-
- π
- 2
- ·
- v
-
- a
-
- c
- 2
- (
- 1
- -
- k
- )
- ·
- P
- ·
- f
- ,
- wherein vac is an AC-line-to-neutral-fundamental-component-RMS voltage of the dual stator generator, P is DC output power, f is a frequency of the generator, and k is a waveform factor.
42 more elements
A dual stator generator for an aircraft, comprising:
- a first rectifier operatively connected to a first stator to receive alternating current (AC) from the first stator;
- a second rectifier operatively connected to a second stator to receive AC from the second stator;
- and
- a first direct current (DC) output line and a second DC output line, wherein the first rectifier and the second rectifier are connected in parallel to the first DC output line and the second DC output line without an inter-phase transformer (IPT) to output DC to the first DC output line and the second DC output line, wherein the first stator and the second stator are sized to have a generator commutation inductance (GCI) approximately equal to or above a critical commutation inductance Lc defined as:
- Lc
- =
- 9
-
- (
- 2
-
- 3
- -
- 3
- )
- 3
-
- 2
-
- π
- 2
- ·
- v
-
- a
-
- c
- 2
- (
- 1
- -
- k
- )
- ·
- P
- ·
- f
- ,
- wherein vac is an AC-line-to-neutral-fundamental-component-RMS voltage of the dual stator generator, P is DC output power, f is a frequency of the generator, and k is a waveform factor;
- and
- wherein a weight of the generator is minimized to increase the GCI while maintaining a desired output DC 12-pulse power quality without the IPT.
38 more elements
A method comprising;
- manufacturing a multi-stator generator system to have a minimized size and/or weight by reducing a size and/or weight of each stator by constraining a generator commutation inductance (GCI) to be approximately equal to or above a critical commutation inductance Lc;
- wherein the multi-stator generator system comprises:
- a first stator and a second stator;
- a first rectifier operatively connected to the first stator to receive alternating current (AC) from the first stator;
- a second rectifier operatively connected to the second stator to receive AC from the second stator;
- and
- a first direct current (DC) output line and a second DC output line, wherein the first rectifier and the second rectifier are connected in parallel to the first DC output line and the second DC output line without an inter-phase transformer (IPT) to output DC to the first DC output line and the second DC output line;
- wherein the critical commutation inductance Lc is defined as:
- Lc
- =
- 9
-
- (
- 2
-
- 3
- -
- 3
- )
- 3
-
- 2
-
- π
- 2
- ·
- v
-
- a
-
- c
- 2
- (
- 1
- -
- k
- )
- ·
- P
- ·
- f
- ,
- wherein vac is an AC-line-to-neutral-fundamental-component-RMS voltage of the first stator and the second stator, P is DC output power, f is a frequency of the generator, and k is a waveform factor;
- and
- wherein the multi-stator generator system does not include the IPT between the first rectifier and the second rectifier.
42 more elements
A generator system, comprising:
- a dual stator generator comprising a first stator and a second stator;
- a first rectifier operatively connected to the first stator to receive alternating current (AC) from the first stator;
- a second rectifier operatively connected to the second stator to receive AC from the second stator;
- and
- a first direct current (DC) output line and a second DC output line, wherein the first rectifier and the second rectifier are connected in parallel to the first DC output line and the second DC output line without an inter-phase transformer (IPT) to output DC to the first DC output line and the second DC output line, wherein the first stator and the second stator each have three phases, wherein the first rectifier and the second rectifier have a 30° phase shift therebetween, wherein a generator commutation inductance (GCI) is selected to be approximately equal to or above a critical commutation inductance Lc, wherein the critical commutation inductance Lc is defined as:
- Lc
- =
- 9
-
- (
- 2
-
- 3
- -
- 3
- )
- 3
-
- 2
-
- π
- 2
- ·
- v
-
- a
-
- c
- 2
- (
- 1
- -
- k
- )
- ·
- P
- ·
- f
- ,
- wherein vac is an AC-line-to-neutral-fundamental-component-RMS voltage of the dual stator generator, P is DC output power, f is a frequency of the generator, and k is a waveform factor.
37 more elements
Dependencies are inferred from the claim text.