CN110784048A

CN110784048A - Stator assembly

Info

Publication number: CN110784048A
Application number: CN201910682373.4A
Authority: CN
Inventors: 黄豪; 贾小川
Original assignee: GE Aviation Systems LLC
Current assignee: GE Aviation Systems LLC
Priority date: 2018-07-27
Filing date: 2019-07-26
Publication date: 2020-02-11
Anticipated expiration: 2039-07-26
Also published as: CN110784048B

Abstract

A permanent magnet generator includes a cylindrical rotor assembly having a set of circumferentially spaced permanent magnets disposed at an outer radius of the rotor assembly and spaced from each other by a non-magnetic spacing element, and a stator assembly configured to coaxially house the rotor assembly. The stator assembly includes: a cylindrical stator core; a circumferentially spaced set of posts extending from the stator core and defining a set of stator slots between adjacent posts; a set of electrically conductive windings wound around the stator slots.

Description

Stator assembly

Cross Reference to Related Applications

This application claims priority and benefit of U.S. provisional patent application No.62/703,922, filed 2018, 7, month 27, which is incorporated herein by reference in its entirety.

Technical Field

The invention relates to a stator assembly.

Background

An aircraft primary electric generator includes a primary generator, an exciter, and a Permanent Magnet Generator (PMG). The PMG is used to power the stator of the exciter. In addition to this main motor-generator PMG, it is also possible to use another PMG to power the airborne aircraft flight computer. Traditionally, each such PMG is in its own mechanical package and separate from the main motor-generator in order to achieve the desired tolerance and redundancy for the manned aircraft. This separation adds weight and takes up space within the aircraft.

Disclosure of Invention

In one aspect, the present disclosure is directed to a stator assembly comprising: a cylindrical stator core; a circumferentially spaced set of posts extending from the stator core and defining a set of stator slots between adjacent posts; a first set of electrically conductive windings wound around a first subset of the stator slots in a first continuous circumferential portion of the stator core; a second set of electrically conductive windings wound around a second subset of the stator slots in a second continuous circumferential portion of the stator core, and wherein the second continuous circumferential portion is different from the first continuous circumferential portion.

In another aspect, the present invention relates to a permanent magnet generator comprising a cylindrical rotor assembly having a set of circumferentially spaced permanent magnets arranged at an outer radius of the rotor assembly and spaced from each other by a non-magnetic spacing element, and a stator assembly configured to coaxially house the rotor assembly. This stator module includes: a cylindrical stator core; a circumferentially spaced set of posts extending from the stator core and defining a set of stator slots between adjacent posts; a first set of electrically conductive windings wound around a first subset of the stator slots in a first continuous circumferential portion of the stator core; a second set of electrically conductive windings wound around a second subset of the stator slots in a second continuous circumferential portion of the stator core, and wherein the second continuous circumferential portion is different from the first continuous circumferential portion. The permanent magnet generator is configured to generate at least a first electrical power output from the first set of electrically conductive windings and a second electrical power output from the second set of electrically conductive windings as the rotor assembly rotates relative to the stator assembly.

Drawings

In the drawings:

FIG. 1 is a perspective view of a gas turbine engine having an electrical generator in accordance with various aspects described herein.

Fig. 2 is a perspective view of an exterior of the generator of fig. 1, in accordance with various aspects described herein.

Fig. 3 is a schematic cross-sectional view of the generator of fig. 2 having a main machine, an exciter, and a Permanent Magnet Generator (PMG) assembly, in accordance with various aspects described herein.

Fig. 4 is a schematic axial view of a PMG assembly and a winding pattern of the generator of fig. 2, in accordance with various aspects described herein.

Fig. 5 is a schematic diagram of a set of vector diagrams of the PMG component of fig. 4, in accordance with various aspects described herein.

Fig. 6 is a schematic diagram of a set of vector diagrams of another PMG component in accordance with various aspects described herein.

Detailed Description

Aspects of the present disclosure may be implemented in any environment, apparatus, or method for arranging, maintaining, constructing, manufacturing, or operating a Permanent Magnet Generator (PMG) assembly, such as in a generator, motor, or the like.

While a "set" of various elements will be described, it should be understood that a "set" can include any number of the corresponding elements, including only one element. As used herein, the term "axial" or "axially" refers to a dimension along a longitudinal axis of a generator or along a longitudinal axis of a component (e.g., a rotor) disposed within a generator. As used herein, the term "radial" or "radially" refers to a dimension that extends between a central longitudinal axis, an outer periphery, or a circular or annular component disposed within the generator. Use of the terms "proximal" or "proximally" refer to a component that is relatively closer to a reference element than another component. The term "forward" used in conjunction with "axial" or "axially" refers to movement in a first direction toward the "front" of the component, while the term "aft" used in conjunction with "axial" or "axially" refers to the opposite direction toward the "rear" of the component.

All directional references (e.g., radial, axial, up, down, left, right, lateral, front, back, top, bottom, above, below, vertical, horizontal, clockwise, counterclockwise) are only used for identification purposes to aid the reader's understanding of the present disclosure, and do not create limitations, particularly as to their position, orientation, or use. Unless otherwise indicated, connection references (e.g., attached, coupled, connected, and engaged) are to be construed broadly and may include intermediate members between a collection of elements and relative movement between elements. Thus, joinder references do not necessarily infer that two elements are directly connected and in fixed relation to each other.

Although terms such as "voltage," "current," and "power" may be used herein, it will be apparent to those skilled in the art that these terms may be related when describing various aspects of circuits or circuit operations. The exemplary drawings are for illustrative purposes only, and the dimensions, locations, order and relative sizes reflected in the drawings may vary.

FIG. 1 illustrates a gas turbine engine 10 having an Accessory Gearbox (AGB)12 and a generator 14 according to one aspect of the present disclosure. The AGB 12 may be mechanically coupled to a turbine shaft (not shown) of the gas turbine engine 10 via a mechanical power take off 16. Gas turbine engine 10 may be any suitable gas turbine engine used in modern commercial and military aviation or it may be a variety of other known gas turbine engines, such as a turboprop or turboshaft engine. The type and details of the gas turbine engine 10 are not germane to this disclosure and are not further described herein. It should be understood that while one aspect of the present disclosure is shown and described with reference to an aircraft environment, the present disclosure is not so limited and finds general application to power systems in non-aircraft applications, such as other mobile applications and non-mobile industrial, commercial, and residential applications. Although a generator 14 is described, aspects of the present disclosure may include a generator, a motor, or any conductor, wire, or set of conductive windings for a commercial or residential appliance.

FIG. 2 more clearly illustrates a non-limiting example of the generator 14 and its housing 18, which may include a clamping interface 20 for clamping the generator 14 to the AGB 12. A plurality of electrical connections may be provided external to the generator 14 to provide for the transmission of electrical power to and from the generator 14. The electrical connections may be connected by cables to a power distribution node of an aircraft having the gas turbine engine 10 to power various items on the aircraft, such as lights and seat back monitors.

A non-limiting example of the interior of the generator 14 is best seen in fig. 3, which is a cross-sectional view of the generator 14 of fig. 2. The rotatable shaft 40 is located within the generator 14 and is the primary structure for supporting the various components. The diameter of rotatable shaft 40 may be fixed or vary along the length of rotatable shaft 40. Rotatable shaft 40 is supported by spaced

apart bearings

42 and 44. Several components of the generator 14 have a stationary component and a rotating component, with the rotating component being disposed on a rotatable shaft 40. Examples of such components may include a main machine 50, an exciter 60, and a PMG assembly 70, wherein the respective rotating components include a main machine rotor 52, an exciter rotor 62, and a PMG rotor assembly 72, respectively, and the respective stationary components include a main machine stator 54, an exciter stator 64, and a PMG stator assembly 74. In this manner, the main machine rotor 52, exciter rotor 62, and PMG rotor assembly 72 may comprise the rotatable shaft 40. The securing member may be mounted to any suitable portion of the housing 18. Each of the main machine stator 54, exciter stator 64, and PMG stator assembly 74 define an interior through which the rotatable shaft 40 extends.

It should be appreciated that each of the main machine rotor 52, exciter rotor 62, and PMG rotor assembly 72 may have a plurality of rotor poles, and each of the main machine stator 54, exciter stator 64, and PMG stator assembly 74 may have a plurality of stator poles, such that a magnetic field may be generated by the various components. In turn, the generator 14 may be operable to generate electrical power through the interaction of a magnetic field and a current carrying conductor located in a rotating or stationary component through rotation of the rotatable shaft 40 relative to the stationary component. For example, in at least one of the rotor poles and the stator poles may be formed from a core having a post and wire wound around the post to form a winding or a set of windings, wherein the set of windings has at least one end turn.

As can be seen in FIG. 3, the main machine stator 54 includes a stator core 89 having at least one post. A set of stator windings 90 is formed when a conductor or wire is wound around a post or core 89. The set of windings 90 may also include a winding segment that extends across the front or back of the core 89 forming at least one end turn 92.

During power generating operations, rotatable rotor 40 is mechanically pushed, driven, or rotated about axis of rotation 41 by a force (such as the mechanical energy of engine 10). Relative rotational movement of the rotatable rotor 40 and the co-rotating component (including at least the main machine rotor 52) with respect to the stationary or stationary stator component (including at least the main machine stator 54) generates electrical power in the set of stator windings 90 due to the interaction of the magnetic fields of the generator 14. The electrical power generated in the set of stator windings 90 may be conductively connected to and further transmitted to at least one electrical load. In one non-limiting aspect, the generator 14 may provide power to a power distribution system or distribution network.

Non-limiting aspects of the generator 14 may be any combination of known generators. For example, the main machine 50 may be a synchronous or asynchronous generator. In addition to the aspects described herein, additional components, devices, etc. may be included to provide operation or functionality of the secondary generator 14. For example, in one non-limiting aspect of the present disclosure, the generator 14 may include electromechanical accessories or other accessories driven by the rotation of the rotatable shaft 40, including but not limited to oil pumps, fluid compressors, hydraulic pumps, and the like.

Further non-limiting aspects of the generator 14 may also include an oil cooling or oil cooling system for controlling oil supply to the oil cooling system. The cooling oil may be used to dissipate heat generated by the electrical and mechanical functions of the generator 14. The oil system may also provide lubrication of the generator 14. In one non-limiting example, the cooling system 80 may also include, for example, a cooling fluid reservoir and various cooling channels. The rotatable shaft 40 may provide one or more flow channels or paths for the main machine rotor 52, exciter rotor 62, and PMG rotor 72. In one non-limiting exemplary aspect of cooling system 80, a flow of cooling oil (as indicated by arrow 85) may be received through a first port (e.g., 84 or 82), which may be provided to rotatable shaft 40 via generator interior 51 or coolant reservoir 86, to shaft outlet port 91.

In a dry cavity generator, the cooling oil is not allowed to contact the insulation system used in the generator 14. This dry chamber approach improves reliability over typical wet chamber designs, which allow oil to contact non-metallic materials (e.g., generator insulation systems). In the dry cavity approach, the insulation system is not degraded because there is no direct impingement of hot oil on the windings. Operation of the Generator 14 with a liquid cooled dry chamber system is known in the art and includes the disclosure in US 7,687,928 entitled Dual-Structured Aircraft Engine Starter/Generator, entitled 3, 30 days 2010, which is incorporated herein by reference. Aspects of the present disclosure are applicable to either dry or wet cavity generator 14 systems.

In the aircraft generator described above, the PMG assembly 70 is used to power the stator 64 of the exciter 60. In addition to this PMG component 70, other PMG components 70 are used to power the onboard aircraft flight computer. Traditionally, each such PMG is in its own mechanical package and separate from the main motor-generator in order to achieve the desired tolerance and redundancy for the manned aircraft. This separation adds weight and takes up space within the aircraft.

Fig. 4 shows a schematic axial facing view of the PMG assembly 70. As shown, the PMG rotor assembly 72 is coaxially housed within the PMG stator assembly 74. The PMG rotor assembly 72 may include a circumferentially spaced set of similar or co-oriented permanent magnets 130, the permanent magnets 130 being fixedly disposed at an outer radius of the PMG rotor assembly 72 and spaced apart from one another by non-magnetic spacing elements 134. In one non-limiting example, for weight saving or weight reduction purposes, for example, the PMG rotor assembly 72 may include a core 71, the core 71 including a non-magnetic material.

The PMG stator assembly 74 includes a number of inwardly facing (relative to the axis of rotation 41) and circumferentially spaced apart sets of posts 73, the posts 73 separating slots 75 between the sets of posts 73. At least a subset of the slots 75 may be wound with a set of conductive windings 77, as described herein. At least a different subset of the slots 106 may be left empty or, for example, filled with a non-conductive material.

Unlike conventional PMGs in electric machines, the PMG stator assembly 74 in the present disclosure may include three different sets of PMG stator windings, shown as a first set of PMG stator windings 100, a second set of PMG stator windings 120, and a third set of PMG stator windings 110. Each respective set of PMG stator windings 100,110,120 may be wound around a finite continuous circumferential portion of the PMG stator assembly 74, a subset of finite continuous (e.g., contiguously adjacent) slots 75, or between a subset of finite continuous (e.g., contiguously adjacent) columns 73. For example, as shown, the first set of PMG stator windings 100 is wound around a finite continuous circumferential first portion 102 of the PMG stator assembly 74, the second set of PMG stator windings 120 is wound around a finite continuous circumferential first portion 122 of the PMG stator assembly 74, and the third set of PMG stator windings 110 is wound around a finite continuous circumferential first portion 112 of the PMG stator assembly 74. In one non-limiting example, the PMG rotor assembly 72 may include a retaining ring, such as the retaining ring 132 shown as Inconel (Inconel), to ensure fixation of the magnet 130 relative to the PMG rotor assembly 72.

Each of the first, second and third PMG stator windings 100,110,120 may be spaced apart by a different subset of finite contiguous (e.g., contiguously adjacent) slots 75, or between a subset of finite contiguous (e.g., contiguously adjacent) posts 73. For example, as shown, each of the PMG stator windings 100,110,120 are spaced apart from one another by a finite continuous circumferential portion 104 of an empty or non-conductive material slot 106. In this sense, each of the PMG stator windings 100,110,120 are mechanically isolated from each other (e.g., the first set of PMG stator windings 100 are mechanically separated from the second set of PMG stator windings 120 by at least empty or non-conductive material slots 106), and are magnetically isolated from each other (e.g., the circumferential first portion 102 is circumferentially spaced from the circumferential second portion 122). Thus, a failure of one of the PMG power outputs (e.g., the power output of the first set of PMG stator windings 100) will not affect or impact the other PMG power output (e.g., the power output of the second or third set of PMG stator windings 120, 110).

Also shown in FIG. 4 is a winding diagram 140 illustrating a non-limiting example of the set of stator windings 100,110,120 of the illustrated PMG stator assembly 70. The winding map 140 is arranged by numbering the horizontally arranged slots 144 and shows the respective phase windings of each respective set of PMG stator windings 100,110, 120. For purposes of understanding, "filled" slots 148 include arrows indicating the winding pattern, while "unfilled," "empty," or "nonmagnetic material filled" slots 146 are not shown with arrows.

In one non-limiting example,

slots

1,4,7, and 10 may be wound with a first phase winding of a first set of PMG stator windings 100 (e.g., PMG 1A with a line pattern 150, where "a" is a phase indication). As described above, the "up" arrow may indicate a first winding direction (e.g., rearward from the axial direction of the PMG stator assembly 74), while the "down" arrow may indicate a second, opposite winding direction (e.g., rearward from the axial direction of the PMG stator assembly 74). It will be appreciated that the direction of the windings may be varied in an alternating pattern. In another example,

slots

3,6,9, and 12 may be wound with a second phase winding of the first set of PMG stator windings 100 (e.g., PMG1B with line pattern 152, where "B" is the phase indication) and

slots

2,5,8, and 11 may be wound with a third phase winding of the first set of PMG stator windings 100 (e.g., PMG 1C with line pattern 154, where "C" is the phase indication).

For the sake of brevity, each winding and slot combination will not be described. The second set of PMG stator windings 120 may include PMG phase 2A with line patterns 156, PMG phase 2B with line patterns 158, and PMG phase 2C with line patterns 160. Similarly, the third set of PMG stator windings 110 may include a PMG phase 3A with a line pattern 162, a PMG phase 3B with a line pattern 164, and a PMG phase 3C with a line pattern 166.

Thus, in the example shown, each respective set of PMG stator windings 100,110,120 may include respective three-phase power (a, B, and C) at the winding power output. As used herein, the phase designations "a", "B", and "C" are used merely to indicate the different phases of a respective set of PMG stator windings (e.g., the first set of PMG stator windings 100). The phases of the different sets of PMG stator windings are not meant to be common to the same step, arrangement, offset, output, etc. For example, PMG 2B 158 does not indicate any similarity in arrangement, construction, etc. with respect to PMG 3B 164. In one non-limiting example, each phase of a respective set of PMG stator windings 100,110,120 may be offset from each other by 120 degrees. In further non-limiting examples, the offset may be determined based on the number of groups, slots, etc. of the PMG stator windings.

Fig. 5 shows a schematic diagram of a set of vector diagrams 200 for the PMG component 70 of fig. 4. As shown, winding vector diagram 210 may illustrate one example arrangement for determining the configuration of slots 144. For example, as shown, the vector diagram of the first set of PMG stator windings 100 shows PMG 1A phases 150 wound in

slots

1,4,7, and 10. This example corresponds to the example equation shown in winding vector diagram 210 and is defined by vector 2206i +1 and opposing 6i + 4. For example, when i equals zero, winding

slots

1 and 4 are identified with respect to vector 220 (six times zero plus one equals one, six times zero plus four equals four). Similarly, when i equals 1, relative vectors 220 identify winding slots 7 and 10 (six times one plus one equals seven, six times one plus four equals ten). The winding vector map 210 may be used to identify or determine the slot 144 winding configuration shown in the winding map 140 for each respective phase and group of the illustrated PMG stator winding 100,110,120 combination. For the sake of brevity, not all of the group winding slots and the equation results will be described.

Fig. 5 also identifies an "unfilled", "empty" or "non-magnetic material filled" slot 146 or an empty or non-conductive material slot 106 as a "removed" slot 230.

Fig. 6 shows a schematic diagram of a set of vector diagrams 300 of another PMG component (not shown). The PMG assembly represented by the set of vector diagrams and fig. 6 may include only the first set of PMG stator windings 301 and the second set of PMG stator windings 321 (compare the three sets of PMG stator windings 100,110,120 in fig. 4 and 5). Also in this example, the first set of PMG stator windings 301 is larger than the set of PMG stator windings 100,110,120 of fig. 4 and 5, the first set of PMG stator windings 301 including additional phase windings PMG 1a 350, PMG1B 352 and PMG 1C 354. In this sense, the first set of PMG stator windings 301 may be configured or adapted to produce a greater electrical output from the windings 301. Additionally, the circumferential portion of the PMG stator assembly 74 may be larger than the circumferential portion 102,112,122 of fig. 4 and 5.

In comparison to the aspects of fig. 4 and 5, the arrangement or configuration of the second set of PMG stator windings 321 (and phases PMG 2a 356, PMG 2B 358, and PMG 2C 360) may be similar in size, circumferential portion, power output, or combinations thereof. The mechanical and magnetic separation between the first set of PMG stator windings 301 and the second set of PMG stator windings 321 may be similar to that shown in fig. 4 and 5 (e.g., "empty" or "non-magnetic material filled" slots 146,346,330 are shown without arrows in the illustration of slots 144 as compared to "filled" slots 340).

As shown, winding vector diagram 310 may illustrate one example arrangement for determining the configuration of slots 144. For example, as shown, the vector diagram of the first set of PMG stator windings 301 shows PMG 1A phases 350 wound in

slots

1,4,7,10,13,16,19,22,25, and 28, as indicated by vectors 320. For the sake of brevity, not all of the group winding slots and the equation results will be described.

Non-limiting examples of the present disclosure may be included in which at least a subset of the electrical power output from the respective set of PMG stator windings 100,110,120,301,321 may be preselected, predetermined or otherwise "distributed" to a particular electrical load or for a particular electrical purpose. For example, one power output from a respective set of PMG stator windings 100,110,120,301,321 may be configured to control synchronous operation of the generator 14, such as providing the power output to the exciter stator 64. In another non-limiting example, the different power outputs from the respective sets of PMG stator windings 100,110,120,301,321 may be configured to power a particular load (e.g., a primary or flight critical load, including but not limited to a Vehicle Management System (VMS), a Flight Computer (FC), or a combination thereof). In yet another example, any permutation of power outputs may power a particular electrical load, a combination of particular electrical loads, or one or more particular electrical purposes. In this sense, any number of PMGs may be tailored or configured according to design to supply a particular power output. Accordingly, aspects of the present disclosure may be applicable to the design, construction, arrangement, manufacture, or operation of the PMG 70, wherein a particular set of PMG stator windings, or power output thereof, may be specifically allocated to a predetermined or preselected electrical load or purpose.

The components of the generator 14 may be any combination of known generators. For example, the main machine 50 may be a synchronous or asynchronous generator. There may be other components in addition to the accessories shown in this aspect that need to be operated for a particular application. For example, in addition to the electric motor accessories shown, there may be other accessories driven from the same rotatable shaft 40, such as a liquid coolant pump, a fluid compressor, or a hydraulic pump.

Further, although one set of stator windings 90 is schematically shown, multiple sets of stator windings 90, or multiple sets of stator windings 90 per stator core slot, may be included. For example, in one non-limiting example, at least two sets of stator windings 90 may be stacked, layered, embedded, mounted, or wound around the stator slots 75. Non-limiting aspects of the present disclosure may also be included wherein at least a subset of the stator windings 90 may include an outer layer of electrically insulating material to electrically isolate the set of stator windings 90 from another set of stator windings 90 or the main machine stator or stator core slots 75.

The foregoing aspects of the present disclosure enable or provide a generator 14 having a power output of more than one PMG component. This enables high integration of multiple mechanically decoupled PMGs or multiple decoupled PMG rotor and stator groups with a single shaft into a single PMG and results in significant weight savings, structural simplification, cost reduction and efficiency improvement.

Alternatively, or in addition to the foregoing benefits, the foregoing aspects enable or provide for a generator 14, the generator 14 operating at a higher power density or producing an increased power level. Yet another advantage of aspects of the present disclosure is that due to mechanical and magnetic separation between the arrangements, failure of a single PMG (e.g., the PMG stator windings or their electrical outputs) will not affect, damage, or otherwise alter the operation of the remaining PMGs. Yet another advantage of the present disclosure may be that certain electrical loads or electrical purposes may be "allocated" to a particular PMG power output. This may improve the reliability of electrical loads (e.g., base or flight critical loads) because the PMG power output is less likely to fail even in the event of a power system outage.

Many other possible aspects and configurations, in addition to those shown in the above figures, are contemplated by the present disclosure.

To the extent not described, the different features and structures of the various aspects may be used in combination with each other as desired. A feature cannot be shown in all figures or aspects and is not meant to be construed as absent but is done for clarity of description. Thus, various features of different aspects may be mixed and matched as desired to form new aspects, whether or not the new aspects are explicitly described. The present disclosure encompasses combinations or permutations of features described herein.

This written description uses examples to disclose aspects of the disclosure, including the best mode, and also to enable any person skilled in the art to practice the disclosure, including making and using any devices or systems and performing any incorporated methods. The patentable scope of the disclosure is defined by the claims, and may include other examples that occur to those skilled in the art. Such other examples are intended to be within the scope of the claims if they have structural elements that do not differ from the literal language of the claims, or if they include equivalent structural elements with insubstantial differences from the literal languages of the claims.

Various features, aspects, and advantages of the present disclosure may also be embodied in any permutation of aspects of the present disclosure, including, but not limited to, the following technical solutions defined in the enumerated aspects:

1. a stator assembly, comprising:

a cylindrical stator core;

a circumferentially spaced set of posts extending from the stator core and defining a set of stator slots between adjacent posts;

a first set of electrically conductive windings wound around a first subset of the stator slots in a first continuous circumferential portion of the stator core; and

a second set of electrically conductive windings wound around a second subset of the stator slots in a second continuous circumferential portion of the stator core, and wherein the second continuous circumferential portion is different from the first continuous circumferential portion.

2. The stator assembly according to any of the aspects, wherein the stator assembly is a permanent magnet generator stator assembly.

3. The stator assembly of any of the above aspects, wherein the power output of the first set of electrically conductive windings is preselected to control synchronous operation of an electrical generator comprising a permanent magnet generator stator assembly.

4. The stator assembly according to any of the aspects, wherein the power output of the second set of electrically conductive windings is preselected to be connected to a particular electrical load.

5. The stator assembly according to any of the aspects, wherein the particular electrical load is at least one of a base load, a flight critical load, a vehicle management system, or a flight computer.

6. The stator assembly of any of the above aspects, wherein the electrical power output of the first set of electrically conductive windings is connected to an exciter stator of an electrical generator, the electrical generator comprising a permanent magnet generator stator assembly.

7. The stator assembly according to any of the aspects, wherein the first set of electrically conductive windings further comprises at least two electrically conductive windings wound around the first subset of stator slots in the first continuous circumferential portion and configured to generate respective at least two phases of electrical power at the electrical outputs of the at least two electrically conductive windings.

8. The stator assembly of any of the aspects, wherein the first set of electrically conductive windings comprises three electrically conductive windings wound around the first subset of stator slots and configured to generate three-phase power at respective power outputs of the three electrically conductive windings.

9. The stator assembly of any of the aspects, wherein the first continuous circumferential portion of the stator core is circumferentially spaced from the second circumferential portion of the stator core by at least one adjacent slot.

10. The stator assembly of any of the aspects, wherein the at least one adjacent slot is one of: at least one empty adjacent slot, or at least one adjacent slot having non-conductive material within the slot.

11. The stator assembly according to any of the aspects, wherein the first set of electrically conductive windings and the second set of electrically conductive windings are electrically isolated from each other.

12. The stator assembly of any of the above aspects, wherein the first set of electrically conductive windings and the second set of electrically conductive windings are magnetically isolated from each other.

13. The stator assembly according to any of the aspects, wherein the first set of electrically conductive windings and the second set of electrically conductive windings are mechanically isolated from each other.

14. The stator assembly of any of the aspects, wherein the first continuous circumferential portion extends around a circumferential portion of the stator core that is larger than the second continuous circumferential portion.

15. The stator assembly of any of the above aspects, wherein the first set of electrically conductive windings is configured to produce a power output greater than a power output of the second electrically conductive windings.

16. A permanent magnet generator comprising:

a cylindrical rotor assembly having a set of circumferentially spaced permanent magnets arranged at an outer radius of the rotor assembly and spaced from each other by non-magnetic spacing elements; and

a stator assembly configured to coaxially house the rotor assembly, and including:

a cylindrical stator core;

a second set of electrically conductive windings wound around a second subset of the stator slots in a second continuous circumferential portion of the stator core, and wherein the second continuous circumferential portion is different from the first continuous circumferential portion;

thus, the permanent magnet generator is configured to generate at least a first electrical power output from the first set of electrically conductive windings and a second electrical power output from the second set of electrically conductive windings as the rotor assembly rotates relative to the stator assembly.

17. The permanent magnet generator according to any of the aspects, wherein the first set of electrically conductive windings further comprises at least two electrically conductive windings having respective at least two electrical power outputs, the at least two electrically conductive windings being wound around a first subset of the stator slots in the first continuous circumferential portion and being configured to generate respective at least two phases of electrical power at the at least two electrical power outputs when the rotor assembly rotates relative to the stator assembly.

18. The permanent magnet generator according to any of the aspects, wherein the first continuous circumferential portion of the stator core is circumferentially spaced from the second circumferential portion of the stator core by at least one adjacent slot.

19. The permanent magnet generator according to any of the aspects, wherein the first continuous circumferential portion extends around a larger circumferential portion of the stator core than the second continuous circumferential portion.

20. The permanent magnet generator of any of the aspects, wherein the first electrical output is greater than the second electrical output.

Claims

1. A stator assembly, comprising:

a cylindrical stator core;

a first set of electrically conductive windings wound around a first subset of stator slots in a first continuous circumferential portion of the stator core; and

2. The stator assembly of claim 1, wherein the stator assembly is a permanent magnet generator stator assembly.

3. The stator assembly of claim 2 wherein the power output of the first set of conductive windings is preselected to control synchronous operation of a generator comprising the permanent magnet generator stator assembly.

4. The stator assembly of claim 3 wherein the power output of the second set of conductive windings is preselected to be connected to a particular electrical load.

5. The stator assembly of claim 4, wherein the particular electrical load is at least one of a base load, a flight critical load, a vehicle management system, or a flight computer.

6. The stator assembly of claim 2 wherein the electrical power output of the first set of electrically conductive windings is connected to an exciter stator of an electrical generator comprising the permanent magnet generator stator assembly.

7. The stator assembly of claim 1, wherein the first set of electrically conductive windings further comprises at least two electrically conductive windings wound around a first subset of the stator slots in the first continuous circumferential portion and configured to generate respective at least two phases of electrical power at electrical power outputs of the at least two electrically conductive windings.

8. The stator assembly of claim 7, wherein the first set of electrical conductive windings comprises three electrical conductive windings wound around a first subset of the stator slots and configured to produce three-phase electrical power at respective power outputs of the three electrical conductive windings.

9. The stator assembly of claim 1, wherein the first continuous circumferential portion of the stator core is circumferentially spaced from the second circumferential portion of the stator core by at least one adjacent slot.

10. The stator assembly of claim 9, wherein the at least one adjacent slot is one of: at least one empty adjacent slot, or at least one adjacent slot having non-conductive material within the slot.