Rotating electric machine and stator assembly for a rotating electric machine

Abstract

The utility model provides a kind of rotary electric machine and the stator assembly of rotary electric machine.The rotary electric machine includes the rotor with multiple rotor teeth and one or more stators.At least one of the one or more stators includes a magnetically conductive core, which includes a core body, multiple protrusions extending away from the center of a stator arc segment formed by at least one of the one or more stators, and multiple finger portions extending from the core body toward the center of the stator arc segment.At least one of the one or more stators also includes permanent magnets and excitable coils, each permanent magnet and each excitable coil is connected to one of the multiple finger portions.When an alternating current is applied in the excitable coil in a magnetic flux switching mode, torque is applied to the multiple rotor teeth.

Description

Technical Field

[0001] This utility model generally relates to permanent magnet electric motors, and more specifically to large-diameter rotary motor bearings driven by a flux-switching motor topology. Background Technology

[0002] The flux-switching motor topology employs a stator with permanent magnets and coils (through which alternating current is applied) and an internal rotor containing magnetically conductive material. When alternating current is applied to the coils of the stator, the change in magnetic flux in the stator generates torque on the rotor.

[0003] In large direct-drive applications, there is significant interest in minimizing the amount of magnetic material used in the motor structure and how to mount the magnets, given the relatively high cost of magnets and their mounting mechanisms. In some applications, even motion requirements in terms of torque or power may not necessitate it, particularly for large permanent magnet motors where the motor's geometry requires magnetic material to surround / form the entire 360-degree rotation angle, necessitating the use of permanent magnets larger than required and expensive mounting equipment. This leads to increased cost, weight, and complexity of the motor assembly.

[0004] Various improvements to the features related to the above aspects exist. Other features can also be incorporated into the above aspects. These improvements and additional features can exist individually or in arbitrary combinations. For example, the various features discussed below related to any of the examples shown can be incorporated into any of the above aspects individually or in any combination. Utility Model Content

[0005] In one aspect, a rotary electric motor is provided. The rotary electric motor includes a rotor comprising a rotatable bearing having an outer bearing surface and a plurality of rotor teeth circumferentially positioned around the outer bearing surface. The rotary electric motor also includes one or more stators. At least one of the one or more stators includes a magnetically conductive core comprising a core body, a plurality of protrusions extending from the core body away from the center of a stator arc segment formed by at least one of the one or more stators, and a plurality of fingers extending from the core body toward the center of the stator arc segment. At least one of the one or more stators also includes a permanent magnet and an excitable coil, each permanent magnet and each excitable coil being coupled to one of the plurality of fingers. Each of the one or more stators is mounted separately from the rotor and positioned relative to the rotor such that the plurality of rotor teeth are radially proximate to the permanent magnets of the one or more stators, enabling interaction between the rotor teeth and the one or more stators. When alternating current is applied in a flux-switching mode in the excitable coil, torque is applied to the plurality of rotor teeth.

[0006] On the other hand, a stator assembly for a rotating electric machine is provided, comprising one or more stators. At least one of the one or more stators includes a magnetically conductive core, the magnetically conductive core including a core body, a plurality of protrusions extending from the core body away from the center of a stator arc segment formed by at least one of the one or more stators, and a plurality of fingers extending from the core body toward the center of the stator arc segment. At least one of the one or more stators also includes a permanent magnet and an excitable coil, each permanent magnet and each excitable coil being coupled to one of the plurality of fingers. Attached Figure Description

[0007] The following figures form part of this specification and are included to further illustrate certain aspects of this disclosure. A better understanding of this disclosure can be achieved by referring to one or more of these figures in conjunction with the detailed description of specific embodiments given herein.

[0008] Figure 1 This is a perspective view of a portion of an exemplary rotary electric motor.

[0009] Figure 2 This is a schematic cross-sectional view of an exemplary flux-switching motor.

[0010] Figure 3A This is a schematic cross-sectional view of a flux-switching motor in the example starting position, showing the magnetic flux lines generated in the motor.

[0011] Figure 3B This shows the subsequent position after the rotor has rotated, and... Figure 3A The same schematic diagram is shown.

[0012] Figure 4 This is a top perspective view showing an exemplary set of laminated rotor teeth.

[0013] Figure 5 This is an illustration of a patient in a computed tomography (CT) scanner.

[0014] Figure 6 This is a perspective view of a portion of another exemplary rotary motor.

[0015] Figure 7A This is a front view of another exemplary stator.

[0016] Figure 7B yes Figure 7A The rear view of the stator shown.

[0017] Figure 7C yes Figure 7A The right view of the stator shown.

[0018] Figure 7D yes Figure 7A Left view of the stator shown.

[0019] Figure 7E yes Figure 7A The top view of the stator shown.

[0020] Figure 7F yes Figure 7A The stator shown is in its bottom view.

[0021] Figure 7G yes Figure 7A The perspective view of the stator shown.

[0022] Figure 8A It has such Figure 7A Another example of a motor stator shown, along as... Figure 7E The sectional view shown is a section view with section lines 8A-8A.

[0023] Figure 8B yes Figure 8A An enlarged view of a portion of the stator shown.

[0024] Figure 8C It shows Figure 8A The simulated magnetic flux of the motor shown.

[0025] Figure 8D yes Figures 1-3B and Figure 6 A cross-sectional view of a portion of the motor shown.

[0026] Figure 8E It shows Figure 8D The motor shown has mounting holes.

[0027] Figure 9 Another exemplary stator is shown.

[0028] In the various views of the accompanying drawings, corresponding reference numerals denote corresponding parts. Although specific features of various examples may be shown in some drawings but not in others, this is merely for convenience. Any feature in any drawing may be referenced or claimed in conjunction with any feature in any other drawing. Unless otherwise stated, the drawings are not drawn to scale. Detailed Implementation

[0029] The following detailed description and examples illustrate preferred materials, components, and procedures used according to this invention. However, this description and these examples are provided by way of example only, and nothing contained herein should be considered as limiting the overall scope of this disclosure.

[0030] For clarity, certain terms are used to describe the disclosed systems and methods when referring to and describing relevant components within this disclosure. Where possible, common industry terms are used in a manner consistent with their generally accepted meaning. Unless otherwise stated, such terms should be given a broad interpretation consistent with the context of this application and the scope of the appended claims.

[0031] Traditional electric motors have magnets on the rotor and energized coils on the stator. Assembling the multiple rotor components, mounting the magnets onto the rotor, and installing the rotor into the motor are complex and labor-intensive processes. In contrast, in the rotating electric motor described herein, utilizing a flux-switching topology, the magnets are removed from the rotor and incorporated into the stator. Removing the magnets from the rotor is advantageous for handling and installation because the rotor bearings can be made from a relatively small number of parts, and the step of mounting the magnets onto the rotor is eliminated. Due to the relatively low utilization rate of the magnets, flux-switching motors require a larger magnet volume than conventional motors. Therefore, it is necessary to reduce the magnet volume to decrease cost, weight, and complexity, especially for motors with relatively large diameters.

[0032] There are many applications where mechanical components rotate around a large internal space, such as computed tomography (CT) scans. Figure 5 This is a schematic diagram showing a patient being examined in a CT scanner 500. During the CT scan, the patient lies supine on a platform that slides into a tunnel containing scanning equipment, such as a radiation source 10, which rotates along a circular track of diameter (D) around the patient. The diameter (D) is sufficient to allow sufficient clearance across / through the patient's entire shoulder-to-shoulder width. In some embodiments, the radiation source may be coupled to an annular bearing rotated by a motor (not shown).

[0033] The systems and components described herein provide a low-cost rotary electric motor particularly suitable for applications where the flux-switching rotor can be manufactured as an integral part of the bearing ring, and the stator can have a reduced arc length (i.e., forming an angle of less than 360 degrees around the rotor). As used herein, the arc length of the stator refers to the angular span defined by stator arc segments of the stator. For example, the stator is formed as stator arc segments. The arc length of the stator is the angle between the radii extending from the center of the stator arc segment to the edge of the stator. The reduction in the circumferential length of the stator is particularly advantageous in large-diameter motor applications because the amount of magnetic material used in the stator is particularly reduced. The amount of magnetic material can be further reduced by providing protrusions on the stator. Protrusions, especially those with transition surfaces forming obtuse angles with the outer body surface or the outer edge of the magnet, also have the advantage of providing resistance to leakage flux generated by air in the space between the protrusions, thereby reducing the reduction in motor performance due to the reduction in magnet volume.

[0034] Figure 1 This is a perspective view of a portion of an exemplary rotary motor 100 using a flux-switching topology. The rotary motor 100 includes a rotor 101. The rotor 101 includes an annular rotor bearing 102 with an inner diameter suitable for applications such as CT scanning, for example, having a diameter of 0.5 meters to 2 meters, and adapted to rotate about a central axis. The bearing 102 includes an outer bearing surface 107 and an inner bearing surface 109 opposite to the outer bearing surface 107. The illustrated rotor bearing 102 can be implemented as a one-piece molded or cast steel component, including raceways 104, 106 for housing ball bearings and a plurality of alternating protrusions and retractors, such as 108, circumferentially positioned around the outer bearing surface 107, wherein the protrusions are referred to as “teeth”. In other embodiments discussed further below, the teeth are not an integral part of the rotor, but can be implemented as laminated portions made of steel that can be mounted onto a portion of the bearing 102. The number and spacing of the teeth are determined according to the design of the stator 110 of the motor. The rotor teeth and rotor bearing are formed as a single unit.

[0035] The motor 100 also includes one or more stators 110. The stators 110 are arranged to surround and circumscribe at least a portion of the rotor's outer surface with a small air gap (e.g., < 1 cm) between them. The stator arc segments form angles significantly less than 360 degrees, such as 90 to 270 degrees, or even less than 90 degrees. In some embodiments, multiple stators may also be used; for example, two stators may be used, each forming an angle of 150 degrees. However, since the torque provided by the motor 100 is proportional to the stator arc length, some applications may require smaller or larger arc lengths, and the stator 110 may include any stator arc length where the stator arc segments form angles up to 360 degrees.

[0036] The stator 110 includes a set of permanent magnets, such as permanent magnets 112 arranged along the arc length of the stator, which can be embedded in a housing. The permanent magnets are made of rare-earth magnetic materials, but can also be made of other magnetic materials. A set of conductive coils, such as 114, are arranged around the stator laminations. In a flux-switching motor, the permanent magnets, such as 112, are arranged with alternating polarities, which generate a first flux mode called "field flux." Furthermore, an alternating current is applied to the coils, such as 114, which in turn generates a second flux mode called "armature flux." During operation, the flux lines generated by the interaction of the field flux and the armature flux attempt to close through the magnetic material of the rotor teeth, thereby generating torque on the rotor.

[0037] Figure 2This is a schematic cross-sectional view of an exemplary flux-switching motor, showing the interlacing relationship between rotor teeth and stator permanent magnets. A rotor 101, including teeth (e.g., 202-1, 202-2, 202-3), is located below a stator 110, which includes permanent magnets (e.g., 112-1, 112-2, 112-3) and coil portions (e.g., 114-1, 114-2, 114-3) located between the permanent magnet portions. The permanent magnets 112-1, 112-2, 112-3 and the coils are embedded in a back iron housing, which may include laminated steel portions.

[0038] As shown in the figure, the rotor teeth 202-1, 202-2, and 202-3 are positioned closer to the permanent magnet regions 112-1, 112-2, and 112-3 on the stator, preventing adjacent teeth from aligning with adjacent permanent magnets. For example, as... Figure 2 As shown, rotor teeth 202-2 are aligned with permanent magnet 112-2, but teeth 202-1 and 202-3 are not aligned with the corresponding permanent magnets 112-1 and 112-3. In this way, the teeth and magnets are considered to be interleaved. This interleaving relationship helps to generate torque in the rotor, as further referenced. Figure 3A and Figure 3B As shown. However, in other embodiments, the stator permanent magnet portion can be positioned closer than the rotor teeth, in which case the interleaving is reversed.

[0039] Figure 3AThis is another schematic cross-sectional view of a flux-switching motor in an exemplary starting position, showing the magnetic flux lines generated in the motor. The permanent magnet portion (e.g., 112 in this example) includes a magnet portion polarized along the horizontal or radial direction of the permanent magnet 112—a direction perpendicular to the radius of the stator arc segment. Magnetic flux lines emerging from the poles of the various portions attempt to close or terminate at poles of opposite polarity. The proximity of the rotor, made of magnetic material, affects the flux distribution, leading to variations in the magnetic force on the rotor. As shown, rotor teeth 202-1 are approximately aligned with permanent magnet 112-1 in region 312, where magnetic flux lines from the permanent magnet close and pass through the material of rotor teeth 202 to reach the other side of the magnet. However, in the air gap region 314 between the adjacent permanent magnet 112-2 on the left and the rotor tooth 202-2, the rotor tooth 202-2 is located to the right of the portion aligned with the permanent magnet 112-2. The magnetic flux lines cannot close through the rotor tooth; instead, they are compressed, thus increasing the magnetic flux density in region 314. This change in relative magnetic flux density generates a force on the rotor to move the rotor tooth 202-2 to the left to align with the magnet 112-2. A similar force acts on the next adjacent rotor tooth in region 316 to exert a force to the left and downward. Together, these forces exert a counterclockwise torque on the rotor. The length of the stator arc segment and all the specific geometries and materials of the components, such as magnets, steel laminations, windings, rotor structural features, etc., are configured to provide specific rotor torque and speed for any given application.

[0040] Figure 3B Showing a later time with Figure 3A The same view, but with the rotor having rotated several degrees counterclockwise. As shown, the torque acting on the rotor teeth has pulled rotor teeth 202-2 closer to align with permanent magnet 112-2, and the magnetic flux lines in region 314 begin to close through rotor teeth 202-2. Figure 3A In contrast, the magnetic flux density in region 316 is increased, thereby increasing the force required in that region to align the rotor teeth 202-3 with the permanent magnet 112-3. Simultaneously, the rotational motion of the rotor has displaced the rotor teeth 202-1 from alignment with the permanent magnet 112-1.

[0041] It should be noted that one advantage of the flux-switching topology is that all flux-generating components are located in a fixed stator, which greatly simplifies rotor design. As mentioned above, the length of the stator arc segments, as well as all specific geometries and component materials, such as magnets, steel laminations, windings, rotor structural features, etc., are optimized for any given use case or application. For example, the rotor teeth involved in the magnetic circuit can be laminated / stacked according to the specific application. The rotor teeth may include laminated layers. Figure 4This is a top perspective view of an exemplary rotor portion including laminated teeth. It can be seen that each tooth consists of a stack of thin laminated steel portions (e.g., 402, 404 arranged axially).

[0042] As described above, in some embodiments, the laminated rotor teeth may not be integrally formed with the rotor bearing components, but may be mounted on the surface of a motor bearing suitable for receiving the rotor teeth. Figure 6 It shows Figure 1 An alternative embodiment of the rotary electric motor shown includes a separate rotor tooth 202 inserted into and mounted on a receiving surface 608 of the rotor bearing 102. The receiving surface is positioned directly below the stator 110 to allow interaction between the rotor tooth 202 and the stator elements.

[0043] Although flux-switched topologies offer the advantage of simpler rotor structures, where the rotor does not require any permanent magnets, they are susceptible to high temperatures affecting eddy current losses in the steel sections of the stator or rotor. This can be mitigated by factors such as... Figure 4 The overlapping of the interacting rotor sections shown in the diagram largely mitigates these drawbacks.

[0044] In CT scanning applications, airflow is typically maintained within the equipment during the examination. Because the airflow passes closest to the stator windings and magnets, it can provide sufficient cooling to offset the heat generated by the stator components during operation. Airflow and / or other cooling methods can also be used in a variety of other "large-diameter" applications, where the large diameter of the rotor bearings provides ample space for airflow.

[0045] Figures 7A-7G Another exemplary stator 110-p in motor 100 is shown. Figure 7A This is the front view of stator 110-p. Figure 7B This is the rear view of stator 110-p. Figure 7C This is the right view of stator 110-p. Figure 7D This is the left view of stator 110-p. Figure 7E This is a top view of stator 110-p. Figure 7F This is a bottom view of stator 110-p. Figure 7G This is a perspective view of stator 110-p.

[0046] Figures 8A-8C It shows Figures 7A-7G The portion of stator 110-p shown. Figure 8A Including a portion of stator 110-p along Figure 7E The cross-sectional view shown is along section lines 8A-8A. A portion of rotor 101 is also included. Figure 8A middle. Figure 8B yes Figure 8AAn enlarged view of a portion of the stator 110-p shown. Figure 8C It shows Figure 8A The simulated magnetic flux lines of a portion of the motor 100 shown.

[0047] In an exemplary embodiment, the motor 100 includes a rotor 101 and one or more stators 110-p. The stators 110-p are formed as stator arc segments. The motor 100 may include one stator 110-p or multiple stators 110-p. Figures 1-3B and Figure 6 Compared to the stator 110 shown, the stator 110-p includes multiple protrusions 802. As further described below, the protrusions 802 help to reduce the size of the magnets while limiting the impact on the performance of the motor 100.

[0048] In an exemplary embodiment, the stator 110 includes a core 804, an excitable coil 114, and a permanent magnet 112 (see [link to example]). Figure 8B Core 804 is made of a magnetically conductive material, such as steel. Core 804 can be formed by lamination to form stator arc segment 808 (see...). Figure 8A The stator arc segment 808 has an arc center or circle center, and the stator arc segment is part of this circle. The arc center is not shown because the diameter of the stator arc segment is relatively large, and the arc center would be located outside the page. For ease of explanation, the stator arc segment 808 and its center are described as being in a plane orthogonal to the longitudinal axis of the stator 110, for example, Figures 2-3B , Figures 8A-8E and Figure 9 The core 804 includes a core body 806. The core body 806 includes an outer body surface 810 facing away from the center of the arc and an inner body surface 812 disposed opposite to the outer body surface 810 and facing the center of the arc.

[0049] In an exemplary embodiment, the core 804 also includes a protrusion 802 extending from the center of the core body 806 away from the outer body surface 810 and the stator arc segment 808. The protrusion 802 includes an outer protruding surface 816 and a transition surface 818 connecting the outer protruding surface 816 to surfaces between adjacent protrusions 802—such as the outer body surface 810 or the outer edge 826 of the magnet 112 between adjacent protrusions 802. The transition surface 818 includes a top edge 820 connecting the transition surface 818 and the outer protruding surface 816 and a bottom edge 822 connecting the transition surface 818 and the outer body surface 810 or the core body 806. In the depicted embodiment, the outer protruding surface 816, the outer body surface 810, and the transition surface 818 are flat. The outer protruding surface 816, the outer body surface 810, and / or the transition surface 818 may have other shapes that enable the stator 110-p to function as described herein, such as curved, convex, or concave shapes. The transition surface 818 may be inclined away from the outer body surface 810 to which it is connected, wherein the transition surface 818 and the outer body surface 810 form an obtuse angle 824. In some embodiments, the transition surface 818 is directly connected to the core body 806 and forms an obtuse angle with the outer edge 826 of the magnet 112. In other embodiments, the transition surface 818 and the outer body surface 810 or the outer edge 826 of the magnet 112 form a right angle (see...). Figure 9 ) or acute angle (not shown).

[0050] In an exemplary embodiment, core 804 further defines a mounting hole 828 passing through core 804. The mounting hole 828 is sized to accommodate a mounting pin or rod, allowing stator 110-p to be mounted to a structure, such as the structure in CT scanner 500 (see [link to example]). Figure 5 ).

[0051] In an exemplary embodiment, the core 804 includes a plurality of fingers 830. The fingers 830 extend from the core body 806 in a direction opposite to the protrusion 802, wherein the fingers 830 extend toward the center of the stator arc segment 808. Finger holes 832 are defined between adjacent fingers 830 and provide space for receiving the coil 114.

[0052] In operation, magnet 112 is coupled to core 804. Magnet 112 may be coupled between fingers 830. In some embodiments, two fingers 830 of adjacent core segments 834 form a unit, and magnet 112 is positioned in or through these two fingers.

[0053] By placing the winding 836 of coil 114 around magnet 112, coil 114 is coupled to core 804 and magnet 112. Coil 114 is excitable, wherein alternating current flowing through winding 836 in flux-switching mode can be used to excite motor 100 to rotate rotor 101, as described above.

[0054] refer to Figure 8D and Figure 8E , Figure 8D It shows Figures 1-3B and Figure 6 Part of the motor 100 shown, Figure 8E The mounting holes 828 included in the motor 100 are shown. The outer diameter of the stator can be defined as the distance from the center of the stator arc segment 808 to the outermost surface of the stator 110. The outer diameter of the stator 110 is relatively large. An example outer diameter of the stator 110 is 1 meter. For such a large stator, mounting holes 828 are required. To accommodate the mounting holes 828, the stator 110 extends further outward. Instead of... Figure 8E As shown, the magnet 112 extends to the outer diameter of the stator 110, but the magnet 112 in the stator 110-p does not extend to the outermost surface of the stator 110p of the outer protruding surface 816, thereby reducing the radial magnet length 838 of the magnet 112 and reducing the overall magnet volume. Simultaneously, the air in the space 840 between the protrusion 802—particularly a protrusion forming an obtuse angle between at least one transition surface 818 and the outer body surface 810 or the outer edge 826 of the magnet 112—provides resistance to leakage flux, thereby reducing the impact on the performance of the motor 100 caused by the reduction in magnet volume.

[0055] Return to reference Figure 8C In an exemplary embodiment, magnetic flux 842 is formed as a loop or circuit passing through magnet 112 and magnetically conductive material, such as rotor teeth 202, fingers 830, and core body 806. Not all magnetic flux 842 flows through the loop, thus introducing leakage flux 844. Leakage flux 844 may not contribute to the torque generated by motor 100. Air resistance in the space 840 between adjacent protrusions reduces leakage flux 844. Resistance can be increased by increasing or optimizing the space 840 between adjacent protrusions 802. For example, the space 840 between adjacent protrusions 802 having at least one transition surface 818 forming an obtuse angle with the outer body surface 810 or the outer edge 826 of magnet 112 is larger than the space 840 between adjacent protrusions 802 having a transition surface 818 forming a right angle or acute angle with the outer body surface 810 or the outer edge 826 of magnet 112. Therefore, by providing space 840 between the protrusions 802, in addition to reducing the magnet volume, the components and system described herein are also advantageous in improving motor performance compared to flux-switching motors with the same magnet volume. The space 840 between the protrusions 802 also reduces weight and the material required for the core 804. Figures 8A-8C In the embodiment shown, air resistance in space 840 can be increased by aligning the outer edge 826 of magnet 112 with the outer body surface 810.

[0056] In an exemplary embodiment, space 840 can be optimized based on an acceptable trade-off between reducing the magnet volume and decreasing motor performance. For example, a threshold or range for the decrease in motor performance can be selected or predetermined, and parameters can be adjusted to increase the amount of magnet volume reduction or achieve the maximum amount of magnet volume reduction.

[0057] In an exemplary embodiment, the parameters used in the optimization include a radial magnet length 838, a cone angle 846, and / or a flat angle 848. The radial magnet length is the length of the magnet 112 in the radial direction of the stator 110. The cone angle is the angle between radii 825-t extending from the center of the stator arc segment 808 to the top edges 820 of the mutually facing transition surfaces 818. The flat angle is the angle between radii 825-f extending from the center of the stator arc segment 808 to the bottom edges 822 of the mutually facing transition surfaces 818. In some embodiments, the arc formed by the outer protruding surface 816 has a different center than the arc formed by the outer body surface 810 or the core body 806. The cone angle 846 or the flat angle 848 is determined based on the center of the arc formed by the outer protruding surface 816 or the center of the arc formed by the outer body surface 810 or the core body 806, respectively.

[0058] In an exemplary embodiment, given a radial magnet length 838, the cone angle 846 and the flat angle 848 are optimized to limit the decrease in motor torque when the coil 114 is energized. Figure 9 Compared to the stator 110-p shown, the cone angle 846 and the flat angle 848 can be increased to increase the space between the protrusions 802, thereby reducing leakage flux. Figure 9 In the stator 110-p shown, the transition surface 818 is directly connected to the core body 806.

[0059] At least one technical effect of the system and method described herein includes (a) reducing magnet volume; (b) reducing the impact on motor performance due to the reduction in magnet volume by including protrusions on the stator—especially protrusions having at least one transition surface that forms an obtuse angle with the adjacent outer body surface or the outer edge of the adjacent magnet; and (c) a motor with optimized magnet volume and performance achieved through optimized radial magnet length, optimized cone angle, and / or optimized flat angle.

[0060] As used herein, elements or steps described in the singular and beginning with the word "a" or "an" should be understood to not exclude multiple elements or steps unless such exclusion is explicitly stated. Furthermore, references to "an embodiment," "exemplary," or "example" embodiments of this disclosure are not intended to exclude the existence of additional embodiments that also incorporate the described features. Likewise, unless explicitly stated otherwise, limitations associated with "an embodiment" or "embodiment" should not be construed as limitations on all embodiments.

[0061] Unless otherwise stated, disjunctive languages ​​such as the phrase "at least one of X, Y, or Z" are generally intended to disclose an item, term, etc., in the presented context. X, Y, or Z can be any combination thereof (e.g., X, Y, and / or Z). Similarly, unless otherwise stated, connective languages ​​such as the phrase "at least one of X, Y, and Z" are generally intended to disclose at least one of X, at least one of Y, and at least one of Z in the presented context.

[0062] The disclosed systems and methods are not limited to the specific embodiments described herein. Rather, components of the system or steps of the method may be used independently of other described components or steps.

[0063] This written description uses examples to disclose various embodiments, including the best mode, to enable those skilled in the art to practice these embodiments, including making and using any device or system and performing any combined methods. The scope of the patent is defined by the claims and may include other examples that would 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 are not different from the literal language of the claims, or if they include equivalent structural elements that are not substantially different from the literal language of the claims.

Claims

1. A rotary electric motor, characterized in that, include: The rotor includes a rotatable bearing having an outer bearing surface, and a plurality of rotor teeth circumferentially positioned around the outer bearing surface. and One or more stators, at least one of the one or more stators comprising: A magnetically conductive core includes a core body, a plurality of protrusions extending from the core body away from the center of a stator arc segment formed by the at least one stator, and a plurality of finger-like portions extending from the core body toward the center of the stator arc segment; permanent magnet; and Each excitable coil, each permanent magnet, and each excitable coil are connected to one of the plurality of fingers. Each of the one or more stators is mounted separately from the rotor and positioned relative to the rotor such that the plurality of rotor teeth are radially close to the permanent magnets of the one or more stators, so that the rotor teeth can interact with the one or more stators, and torque is applied to the plurality of rotor teeth when alternating current is applied in the excitable coil in a flux-switching mode.

2. The rotary motor according to claim 1, characterized in that, The plurality of protrusions include an outer protruding surface and a transition surface, the transition surface connecting the outer protruding surface to the core body.

3. The rotary motor according to claim 2, characterized in that, At least one transition surface forms an obtuse angle with one of the outer body surfaces of the core body or the outer edge of one of the permanent magnets.

4. The rotary motor according to claim 2, characterized in that, The permanent magnet has a radial magnet length, and the magnetic core has a cone angle and a flat angle. At least one of the radial magnet length, the cone angle, and the flat angle is optimized based on a trade-off between reducing the magnet volume and reducing the torque generated by the rotating motor when the excitable coil is energized.

5. The rotary motor according to claim 1, characterized in that, The outer edge of the permanent magnet is aligned with at least one outer body surface of the core body.

6. The rotary electric motor according to claim 1, characterized in that, The magnetic core defines multiple mounting holes.

7. The rotary motor according to claim 1, characterized in that, The bearing includes at least one raceway located on the outer bearing surface for accommodating a ball bearing.

8. The rotary motor according to claim 1, characterized in that, The rotor teeth include laminated layers.

9. The rotary motor according to claim 1, characterized in that, The bearing has an inner bearing surface opposite to the outer bearing surface, and the diameter of the inner bearing surface is greater than or equal to 0.5 meters.

10. The rotary electric motor according to claim 1, characterized in that, The bearing and the rotor teeth are integrally formed into a single unit.

11. The rotary electric motor according to claim 1, characterized in that, The total arc length of the one or more stators is less than 360 degrees.

12. A stator assembly for a rotating electric machine, the stator assembly comprising one or more stators, characterized in that, At least one of the one or more stators includes: A magnetically conductive core includes a core body, a plurality of protrusions extending from the core body away from the center of a stator arc segment formed by the at least one stator, and a plurality of finger-like portions extending from the core body toward the center of the stator arc segment; permanent magnet; and An excitable coil, each permanent magnet and each excitable coil is connected to one of the plurality of fingers.

13. The stator assembly according to claim 12, characterized in that, The plurality of protrusions include an outer protruding surface and a transition surface, the transition surface connecting the outer protruding surface to the core body.

14. The stator assembly according to claim 13, characterized in that, At least one transition surface forms an obtuse angle with one of the outer body surfaces of the core body or the outer edge of one of the permanent magnets.

15. The stator assembly according to claim 13, characterized in that, The permanent magnet has a radial magnet length, the magnetic core has a cone angle and a flat angle, and at least one of the radial magnet length, the cone angle and the flat angle is optimized based on a trade-off between reducing the magnet volume and reducing the torque generated by the rotating motor when the excitable coil is energized.

16. The stator assembly according to claim 12, characterized in that, The outer edge of the permanent magnet is aligned with at least one outer body surface of the core body.

17. The stator assembly according to claim 12, characterized in that, The magnetic core defines multiple mounting holes.

18. The stator assembly of claim 12, wherein, The total arc length of the one or more stators is less than 360 degrees.

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