Rotor assembly
阅读说明:本技术 转子组件 (Rotor assembly ) 是由 约翰·S·米尔斯 奥斯丁·迈克尔·科伯特 托德·埃里克·鲁克 于 2020-03-10 设计创作,主要内容包括:一种用于电机的转子组件,包括:圆柱形转子芯;从转子芯径向向外延伸的一组柱,在相邻柱之间限定一组槽;由缠绕在该组槽中的导线形成的一组绕组,其具有轴向延伸超过转子芯的端匝;和覆盖端匝的保持壳体。(A rotor assembly for an electric machine comprising: a cylindrical rotor core; a set of posts extending radially outward from the rotor core, a set of slots being defined between adjacent posts; a set of windings formed of wire wound in the set of slots, having end turns extending axially beyond the rotor core; and a retention housing covering the end turns.)
1. A rotor assembly for an electric machine, comprising:
a cylindrical rotor core defining a radially facing seat;
a set of posts extending radially outward from the rotor core, a set of slots being defined between adjacent posts;
a set of windings formed from wire wound in slots having end turns extending axially beyond the rotor core; and
a retention housing defining a first retention portion radially covering the end turn and a second retention portion axially covering at least the axially facing portion of the end turn, and wherein the retention housing is received by the seat;
wherein the guidance of the retention housing to the seat prevents imbalance of the set of windings during rotation of the rotor assembly.
2. The rotor assembly of claim 1 wherein the second retention portion axially covers a predetermined axially facing portion of the end turn such that the end turn does not move axially outward from the rotor assembly on the second retention portion.
3. The rotor assembly of claim 1 wherein the rotor core further comprises end laminations defining the radially facing seats.
4. The rotor assembly of claim 1 wherein an end of the first retaining portion is received by the seat.
5. The rotor assembly of claim 4 wherein the end of the first retaining portion is distal from the second retaining portion.
6. The rotor assembly of any one of claims 1-5 wherein the guidance of the retention housing to the seat at a first circumferential location prevents radial imbalance of the set of windings at diametrically opposite portions of the rotor assembly.
7. The rotor assembly of any one of claims 1-5 further comprising a longitudinal axis of rotation defined by the rotor core, and wherein the inner surface portion of the first retention portion defines a surface having an offset angle relative to the longitudinal axis.
8. The rotor assembly of claim 7 wherein the inner surface portion is angled to include a radial dimension that increases along the inner surface portion while moving away from the rotor core.
9. The rotor assembly of claim 8 wherein the inner surface portion provides for a convergence of the end turns at another radius due to centripetal acceleration experienced by the end turns during rotation of the rotor assembly.
10. The rotor assembly of claim 7 wherein the inner surface portion defines a normal force vector experienced by the end turn during rotation of the rotor assembly, wherein the normal force vector comprises a radial force vector component and an axial force vector component.
Technical Field
The present disclosure relates generally to electric machines and, more particularly, to a retention mechanism for preventing imbalance in an electric machine during operation.
Background
Electric machines, such as motors or generators, are used for energy conversion. In the aircraft industry, it is common to find an electric motor having a combination of motor and generator modes, wherein the electric motor is used in motor mode for starting the aircraft engine, and according to which mode the electric motor is also used as a generator for powering the power supply of the aircraft systems. Regardless of the mode, an electric machine typically includes a stator having windings that works with a rotor that also has windings and is driven in rotation by a rotating source, which may be a gas turbine engine for a generator or a stator for an electric motor.
Disclosure of Invention
In one aspect, the present disclosure relates to a rotor assembly for an electric machine, comprising: a cylindrical rotor core defining a radially facing seat; a set of posts extending radially outward from the rotor core, a set of slots being defined between adjacent posts; a set of windings formed of wire wound in the set of slots, having end turns extending axially beyond the rotor core; and a retention housing defining a first retention portion radially overlying the end turn and a second retention portion axially overlying at least the axially facing portion of the end turn, and wherein the retention housing is received by the seat. The guidance of the retention housing to the seat prevents imbalance of the set of windings during rotation of the rotor assembly.
Drawings
In the drawings:
fig. 1 is an isometric view of a rotor assembly in accordance with various aspects described herein.
Fig. 2 is an exploded view of the rotor assembly of fig. 1 in accordance with various aspects described herein.
Fig. 3 is a cross-sectional view of the rotor assembly of fig. 1 taken along line III-III of fig. 1, in accordance with various aspects described herein.
Fig. 4 is an enlarged cross-sectional view of a retention housing of the rotor assembly of fig. 1 in accordance with various aspects described herein.
Fig. 5 is another cross-sectional view of the rotor assembly of fig. 1, in accordance with various aspects described herein.
Fig. 6 is an axial cross-sectional view of the rotor assembly of fig. 1 in accordance with various aspects described herein.
Detailed Description
Aspects of the present disclosure may be implemented in any rotor or motor assembly having a set of wound rotor slots. For purposes of description, the rotor assembly is described with respect to an electric machine, an electric machine assembly, a generator, or the like, which is intended to clarify that one or more stator/rotor combinations may be included in the electric machine. Non-limiting aspects of the electric machine may include a generator, a motor, a starter/generator, and the like.
Although 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 terms "axial" or "axially" refer to a dimension along the longitudinal axis of a reference component or along the longitudinal axis of a component disposed relative to a respective axis.
As used herein, the term "radial" or "radially" refers to a dimension extending between a central longitudinal axis of a respective component or a central longitudinal axis of a circular or annular component disposed relative to the respective 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 the position, orientation, or use of the disclosure. Unless otherwise specified, 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. As such, joinder references do not necessarily infer that two elements are directly connected and in fixed relation to each other.
The exemplary drawings are for illustrative purposes only and the dimensions, locations, order and relative dimensions reflected in the accompanying drawings may vary.
Fig. 1 shows a
Also shown is a
Fig. 2 shows an axial exploded view of the
Fig. 3 illustrates a cross-section of the
A set of
As used herein, "guide" or "guiding" may refer to the configuration or adaptation of the components described to ensure that the components maintain position relative to each other. For example, the first retaining portion 36 is radially supported by the seat 46 and the
The set of holding
At least a portion 40 of the radially facing inner surface of the first retaining portion 36 also includes an angled surface, wherein the angle of the surface of the portion 40 is offset relative to the longitudinal axis. As shown, the angle of portion 40 may result in an increase in the radial dimension along surface portion 40 while moving away from the axial center of
In another non-limiting example, the angled surface portion 40 may further include a layer, coating, or the like, schematically represented as layer 42, disposed on the angled surface portion 40 or between the surface portion 40 and the set of
Turning now to fig. 4, an enlarged view of the second retaining
Fig. 5 shows a cross-sectional view similar to fig. 3, but taken at a different cross-section through the
Fig. 6 shows an axial sectional view of the
Additionally, fig. 6 illustrates that the set of winding
As described herein, aspects of the present disclosure may also include methods of forming the
The present disclosure contemplates many other possible aspects and configurations in addition to those shown in the above figures. In addition, the design and arrangement of the various components are rearranged such that numerous different configurations may be implemented.
Aspects disclosed herein provide a rotor assembly configured or adapted to retain the set of rotor windings during rotation of the rotor assembly. The technical effect is that the above aspects enable the set of rotor windings to be maintained or maintained in a predetermined radial and axial envelope. One advantage that may be realized in the above-described aspect is that the above-described aspect enables the guide features to keep the rotor set or rotor windings, the retention housing, etc. centered relative to the rotor core material and also relative to the longitudinal axis. Conventional rotor assemblies may be radially offset in operation. Such misalignment may lead to imbalance problems and potential friction of the rotor assembly relative to another annular component (e.g., the housing or stator). The guiding aspect includes slight interference with the rotor core end laminations during installation. The end laminations can properly guide and support the stack of holding shells by a guiding aspect.
Another advantage of the present disclosure may include a
Yet another advantage of the present disclosure may include: the inner diameter of the retention housing design has built-in angled features or surfaces that maintain the axial positioning of the retention housing during operation. The rotor windings are compressed into the recessed area, thereby maintaining an axially inward force on the retention housing (e.g., toward the rotor core). In addition, the greater the centrifugal load on the rotor windings, the greater the force acting on the belt, thereby holding it inside. This prevents the retention housing from moving axially out of the rotor assembly or the seat.
Yet another advantage of the present disclosure may include the use of shaped ejector pins that retain the rotor windings in the slots. The ejector pin is made of a material much harder than conventional ejector pins and prevents the coil wire from moving in or out of the slot. Aspects of the present disclosure may result in additional rotor windings per slot, or in the rotor assembly rotating at higher speeds without migrating the ram into the rotating air gap between the rotor assembly and the stator component due to centrifugal loading of the rotor windings acting on the ram. The configuration or shape and material combination of the ejector pins described herein prevents movement of the wire under the loading conditions described above.
The different features and structures of the various aspects may be used in combination with each other as desired, insofar as not described. A feature cannot be explained in all aspects and is not meant to be construed as an inability to explain it, but rather to simplify the description. Thus, the various features of the different aspects can be mixed and matched as desired to form new aspects, whether or not such aspects are explicitly described. Combinations or permutations of features described herein are covered by this disclosure.
This written description uses examples to disclose various aspects of the disclosure, including the best mode, and also to enable any person skilled in the art to practice various aspects of 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.
Other aspects of the invention are provided by the subject matter of the following clauses:
a rotor assembly for an electric machine comprising: a cylindrical rotor core defining a radially facing seat; a set of posts extending radially outward from the rotor core, a set of slots being defined between adjacent posts; a set of windings formed from wire wound in the slots, having end turns extending axially beyond the rotor core; and a retention housing defining a first retention portion radially covering the end turn and a second retention portion axially covering at least the axially facing portion of the end turn, and wherein the retention housing is received by the seat; wherein the guidance of the retention housing to the seat prevents an imbalance of the set of windings during rotation of the rotor assembly.
The rotor assembly according to any of the preceding claims, wherein the second retention portion axially covers the predetermined axially facing portion of the end turn such that the end turn does not move axially outward from the rotor assembly on the second retention portion.
A rotor assembly according to any preceding claim, wherein the rotor core further comprises end laminations defining radially facing seats.
The rotor assembly according to any preceding claim, wherein an end of the first retaining portion is received by the seat.
The rotor assembly according to any preceding item, wherein an end of the first retaining portion is distal from the second retaining portion.
The rotor assembly according to any preceding claim, wherein maintaining the guidance of the housing towards the seat at the first circumferential position prevents radial imbalance of the set of windings at diametrically opposite portions of the rotor assembly.
The rotor assembly according to any preceding item, further comprising a longitudinal axis of rotation defined by the rotor core, and wherein the inner surface portion of the first retention portion defines a surface having an offset angle relative to the longitudinal axis.
A rotor assembly according to any preceding item, wherein the inner surface portion is angled so as to include a radial dimension that increases along the inner surface portion while moving away from the rotor core.
The rotor assembly according to any of the preceding claims, wherein the inner surface portion provides for a concentration of the end turns at another radius due to centripetal acceleration experienced by the end turns during rotation of the rotor assembly.
A rotor assembly according to any of the preceding items, wherein the inner surface portion defines a normal force vector experienced by the end turn during rotation of the rotor assembly, wherein the normal force vector includes a radial force vector component and an axial force vector component.
The rotor assembly according to any of the preceding claims, further comprising a layer disposed between the inner surface portion and the end turns, wherein the layer defines an adhesion force between the inner surface portion and the end turns.
A rotor assembly according to any preceding item, wherein the layer is an adhesive, a varnish or an epoxy.
A rotor assembly according to any of the preceding items, wherein the varnish or epoxy is placed between the inner surface portion and the end turns before the varnish or epoxy is fully cured, and then the varnish or epoxy is fully cured, and wherein the adhesion is defined by the varnish or epoxy being fully cured.
A rotor assembly according to any of the preceding, wherein during rotation of the rotor assembly, compression of the end turns towards the inner surface portion generates an axial force directed at least partially axially inwardly towards the rotor core.
The rotor assembly according to any preceding claim, wherein the axial force generated therein ensures that the retention housing remains accommodated by the seat.
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