Electromechanical device with outer stator and inner coil

Abstract

The rotating electric machine comprises a stator, a central rotating shaft and a rotor mounted on the central rotating shaft, the rotor being axially aligned with the stator and radially inward of the stator, with a radial air gap between the stator and the rotor, an annular coil having an outer radius and an inner radius and concentric with the central rotating shaft, and the radial air gap being at a predetermined air gap radius. The inner radius of the annular coil is smaller than the predetermined air gap radius. The rotating electric machine may be constructed without permanent magnets and operate as a switched reluctance machine, or constructed with alternating polarity magnets and operate as a synchronous machine, or constructed with permanent magnets all of the same polarity and parallel orientation and operate as a switched reluctance machine using alternating current that imparts a reduced RMS value.

Description

Technical Field

[0001] The present invention generally relates to a rotating electrical machine including a motor and a generator, wherein the torque of the motor or the generator is generated by a transverse magnetic flux flowing in the axial plane, and the coils of each phase are annular and arranged around the motor shaft.

[0002] (Related Application) This application claims the benefit of priority of U.S. Provisional Patent Application No. 63 / 530,268, filed on August 2, 2023, the content of which is hereby incorporated by reference in its entirety.

Background Art

[0003] Several types of electric machines are commonly used in industry. These electric machines are characterized by size, output torque or force, maximum speed, efficiency, and other characteristics. An important characteristic of an electric motor is the output of maximum continuous torque or force for a given motor size and weight.

[0004] There are many types of motors used in industry. Examples include AC induction motors, synchronous rotating motors, switched reluctance motors, and synchronous switched reluctance motors.

[0005] The torque output utilized by these motors is generated by a variable magnetic flux across an air gap provided between the magnetic elements of the rotor and the stator. Generally, the stator surrounds the rotor and the coils are wound around the stator. The air gap is located at a position Ra from the shaft axis, which is referred to herein as the air gap radius. Therefore, the coils are wound outside the air gap radius Ra to provide space for the rotation of the rotor.

[0006] The torque output of the motor is the product of the tangential force generated in the air gap and the air gap radius. Therefore, it is desirable to design a motor having the largest possible air gap radius.

[0007] Certain types of motors exist, primarily lateral flux motors and axial flux motors, which have annular coils fixed to a stator around a motor shaft. One advantage of these motors is that they require fewer coils, regardless of the number of poles, i.e., one coil per phase. Examples of such rotary motors are shown in U.S. Patent No. 5,543,674 by Koehler, U.S. Patent No. 9,252,650B2 by Villaret, International Publication No. 2022 / 229957A1 by Villaret et al., International Publication No. 2021 / 044426 by Villaret, and U.S. Patent No. 7,750,529B2 by Tajima et al.

[0008] In these patents, the annular coil has an inner diameter larger than the air gap diameter to allow the rotor to rotate freely. An exception is U.S. Patent No. 9,252,650B2 by Villaret, which shows an annular coil inside the air gap diameter, where the air gap is an axial air gap. A smaller coil diameter results in shorter winding lengths for the same cross-sectional area, leading to lower coil resistance and improved motor efficiency.

[0009] However, Villaret's patent is designed to have an axial air gap. The axial air gap fluctuates during motor operation due to the various thermal expansions of the motor's components. Furthermore, the construction of the motor according to Villaret's U.S. Patent No. 9,252,650B2 is highly complex because the magnetic elements need to be divided into several parts and inserted / fixed to the rotor, while the surrounding coils need to be fixed to the stator. [Overview of the project]

[0010] The objective of this embodiment is to provide a lateral magnetic flux type electric machine, which is either a motor or a generator, that combines the advantages of a) having a radial air gap, b) being a stationary annular coil with an inner diameter smaller than the air gap diameter, and c) having a simple structure.

[0011] This embodiment is based on the idea that if the diameter of the annular coil is small, the wire becomes shorter, and as a result the resistance can be lower. Therefore, since the total length of wire wound around the coil is short, the electrical resistance of the coil becomes relatively small. On the other hand, magnetic circuit excitation is the number of turns multiplied by the current in the coil (NI). Therefore, since the Joule heat loss in the motor is proportional to the resistance of the coil, a small coil diameter is advantageous for a given NI.

[0012] According to one aspect of this embodiment, stator and, A central rotating shaft and a rotor attached to the central rotating shaft, wherein the rotor is axially aligned with the stator and radially inward of the stator, and a defined radial gap exists between the stator and the rotor. An annular coil having an outer radius and an inner radius, concentric with a shaft, wherein the radial air gap is located at a predetermined air gap radius, and the inner radius of the annular coil is smaller than the predetermined air gap radius, and A rotating electric machine is provided that includes the following features.

[0013] In this embodiment, the rotor comprises a plurality of U-shaped yokes, each U-shaped yoke oriented such that the opening of the U faces radially outward, and the annular coil is housed at least partially within the opening of the rotor yoke.

[0014] In this embodiment, the stator comprises a plurality of U-shaped yokes, each U-shaped yoke oriented such that the opening of the U faces radially inward, and the annular coil is partially housed within the opening of the stator yoke.

[0015] In this embodiment, the stator is fixed to the external housing, and the annular coil is held from the external housing via a radially inward pressing element.

[0016] The embodiment may have a single phase or multiple phases, for example, three phases, each phase having a stator and rotor aligned in the axial direction and each annular coil.

[0017] Embodiments may provide a switch reluctance machine, particularly when the yoke is provided without a permanent magnet.

[0018] Alternatively, embodiments may include permanent magnets. In one example, permanent magnets of alternating polarity may be attached to the ends of each rotor yoke, thereby providing a machine that is a synchronous machine.

[0019] Alternatively, to provide another method of synchronous machines, alternating polarity permanent magnets may be attached to the ends of each stator yoke.

[0020] This machine has a magnetic circuit that extends between the stator and rotor for each phase, and the magnetic circuit extends through the radial air gap between the stator and rotor.

[0021] This machine may be equipped with permanent magnets of the same polarity arranged within the magnetic circuit. This is a method for creating a switched reluctance machine using alternating current.

[0022] In this embodiment, permanent magnets of the same polarity are inserted into the base of each stator yoke.

[0023] The machine may be equipped with wedges fitted between each stator yoke for each phase, the wedges being pressed radially inward to push each stator yoke apart.

[0024] According to a second aspect of the present invention, a method for manufacturing a rotating electric machine is provided. This method is The step of arranging a plurality of U-shaped stator yokes around an annular coil, with each U-shaped opening facing radially inward and covering the coil; The step of inserting a shaft into the center defined by the annular coil; The step of fixing a plurality of U-shaped rotor yokes to the shaft within the annular coil, where each U-shaped opening faces radially outward and the annular coil is arranged together with the openings, and fixing the plurality of U-shaped rotor yokes to the shaft within the annular coil; The step of temporarily fixing the stator yoke to the annular coil by temporary fastening; The step of arranging the stator yoke together with the annular coil, rotor yoke, and shaft within the housing; The step of fixing the stator yoke to the housing; The step of fixing the annular coil to the housing by removing the temporary fastening to the annular coil; including.

[0025] According to a third aspect of the present invention, for each at least one phase, there is provided an annular coil concentric with a central shaft, and a radial air gap between an outer stator and an inner rotor at an air gap radius that defines the spread in the outer diameter direction of the rotor. The annular coil is at least partially placed within the opening facing the outside of the rotor such that the inner radius of the annular coil is smaller than the air gap radius. [[ID=2)]

[0026] Unless otherwise defined, all technical and / or scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. Methods and materials similar or equivalent to those described herein can be used in the practice and testing of embodiments of the present invention, but exemplary methods and / or materials are described below. In case of conflict, the specification of the present invention, including definitions, will control. In addition, the materials, methods, and examples are illustrative only and not intended to be limiting.

Brief Description of the Drawings

[0027] [Figure 1] This is a diagram of one phase of a motor according to a switched reluctance embodiment of the present invention. [Figure 2] This is a diagram of a three-phase motor, where each phase is according to the embodiment shown in Figure 1. [Figure 3] This is an axial cross-sectional view of the phase shown in Figure 1. [Figure 4] This figure shows the stacking direction of the U-shaped rotor yoke in the embodiment shown in Figure 1 and in other embodiments. [Figure 5] This figure shows the stacking direction of the U-shaped stator yoke in the embodiment of Figure 1 and other embodiments. [Figure 6a] Figure 1 is a simplified schematic diagram showing the coil fixing components for the embodiment and other embodiments of the present invention. [Figure 6b] Figure 6a is a perspective view of the coil fixing component. [Figure 7] This is a cross-sectional view of a rotor constructed with laminates and a U-shaped yoke according to the embodiment shown in Figure 1. [Figure 8] This is a simplified schematic diagram of the implementation of a synchronous motor phase according to an embodiment of the present invention, in which magnets are arranged on the rotor. [Figure 9] This is a simplified schematic diagram of the implementation of a synchronous motor phase according to an embodiment of the present invention, in which magnets are arranged on the stator. [Figure 10] This is a simplified schematic diagram showing the implementation of a switched reluctance motor phase according to an embodiment of the present invention, in which a magnet is inserted into a magnetic circuit formed by a yoke. [Figure 11] This is a simplified diagram showing a structure for fixing the rotor winding core around the shaft according to an embodiment of the present invention. [Figure 12] This flowchart shows the manufacturing method of the machine according to this embodiment. [Modes for carrying out the invention]

[0028] This embodiment may provide an electric rotating machine having a shaft-concentric annular coil and a radial air gap, wherein the inner radius of the annular coil is smaller than the air gap radius. The magnetic circuit of the electric machine is formed by a U-shaped rotor yoke and a U-shaped stator yoke surrounding a portion of the annular coil. The electric machine may be constructed without permanent magnets and operate as a switched reluctance machine, or it may be constructed using magnets of alternating polarity and operate as a synchronous machine, or it may be constructed using permanent magnets of the same polarity and parallel orientation and be a switched reluctance machine using alternating current that imparts a reduced RMS value.

[0029] The electric machine according to this embodiment may be of several types, such as a synchronous motor having magnets of alternating polarity between the motor poles, a switched reluctance motor without magnets, or a switched reluctance motor having magnets of the same polarity on all poles. In a motor with magnets, the magnets may be attached to the rotor or to the stator.

[0030] The electrical machine according to this embodiment may include multiple phases, most commonly three phases.

[0031] One phase of the electromachine according to this embodiment may include an annular coil arranged around a motor shaft and fixed to a stator housing. The one phase also includes a U-shaped rotor yoke and a U-shaped stator yoke. The U-shaped rotor yoke faces the U-shaped stator yoke in the radial air gap. The U-shaped stator yoke and U-shaped rotor yoke surround the annular coil in the axial direction, forming a magnetic circuit that surrounds a portion of the coil. The U-shaped rotor yoke may be fixed to the shaft in the axial direction, that is, it may be fixed to the shaft in the axial direction such that a U shape is formed in a plane containing the shaft axis and the opening of the U shape faces outward. Many rotor yokes and stator yokes are arranged around the shaft.

[0032] In the embodiment, the U-shaped yoke is made of a magnetic material and / or permanent magnets (PM). The permanent magnets may be included in the rotor yoke and / or stator yoke.

[0033] In one embodiment, several U-shaped stator yokes are fixed to the motor or machine housing and are distributed circumferentially around the rotor yoke. The U-shaped stator yokes are oriented axially, and the U-shaped openings face inward.

[0034] As the rotor rotates, several rotor yokes and stator yokes face each other at several angular positions, preferably with a small air gap at their U-shaped ends, forming a magnetic circuit that surrounds a portion of the annular coil.

[0035] In one embodiment, the number of stator yokes and rotor yokes are equal, but an unequal number of rotor yokes and stator yokes may also be used, for example, to smooth out motor torque fluctuations during rotation. When the angular position of the rotor yoke coincides with the position of the stator yoke during rotation, high inductance occurs / exists in the coil. When the angular position of the rotor yoke is such that it is away from the angular position of the stator yoke, low inductance occurs / exists in the coil.

[0036] When current flows through the coil, magnetic flux is induced in the rotor yoke and stator yoke, generating torque that tends to rotate the rotor towards the position with higher magnetic energy.

[0037] Therefore, the useful torque of a motor or generator can be obtained by applying current to a coil when the generated torque is in a desired direction at an angular position. If the motor according to this embodiment includes multiple phases, the electronic motor drive / inverter can control the current of each phase so that the total torque generated by all phases is equal to a desired value, for example, equal to a command value for all angular positions of the rotor.

[0038] Before describing in detail at least one embodiment of the present invention, it should be understood that the present invention is not necessarily limited in its applications to the structural and arrangement details of the components and / or methods shown in the following description and / or described in the drawings and / or examples. Other embodiments of the present invention are possible, or can be practiced or implemented in various ways.

[0039] In this specification, the following examples illustrate a three-phase embodiment. However, those skilled in the art may consider different numbers of phases. Torque ripple can be reduced by using a number of phases greater than three.

[0040] The following describes an embodiment of the motor, but a similar description applies to an embodiment of the generator.

[0041] Referring now to Figure 1, which is a simplified schematic diagram of the phases of a motor 100 constructed according to one embodiment of the present invention. The motor phases include a rotor having a shaft 101 and U-shaped rotor yokes 103. The U-shaped rotor yokes 103 are distributed circumferentially around the shaft at the same axial position along the shaft. Since these U-shaped rotor yokes 103 are fixed to the shaft in the axial direction, the U-shape is formed in a plane containing the shaft axis, and the opening of the U-shape faces radially outward.

[0042] The motor phase also includes a stator having a stator yoke 102 and a coil 104. A housing (not shown) may enclose the rotor and stator. The coil 104 is fixed concentrically to the shaft in a position that fits within the opening of the U-shaped rotor yoke 103. That is, the coil fits within the U-shape. A small air gap is provided between the surface of the coil and the surface of the rotor yoke, allowing the rotor yoke 103 to rotate freely around the axis of the shaft 101. One of the features of the motor phase according to this embodiment is that the inner diameter of the coil 104 is smaller than the outer diameter of the rotor yoke 103. The following describes how the coil 104 can be mounted in such a position.

[0043] As described above, many U-shaped stator yokes 102 can be distributed circumferentially around the U-shaped rotor yoke 103. The stator yokes are located in the same axial position along the shaft and have inward-facing openings. The U-shaped stator yokes 102 are fixed to a motor housing (not shown). As the rotor rotates, the ends of the U-shaped rotor yoke 103 rotate below the U-shaped stator yokes 102. There is a small air gap 105. When current is passed through the coil 104, an attractive torque is generated at each U-shaped rotor yoke, with a magnitude corresponding to the relative angular position between the U-shaped rotor yoke 103 and the two nearest U-shaped stator yokes 102.

[0044] A current controller may be used to generate a desired torque corresponding to the rotor angle position by applying a calculated current of intensity.

[0045] Referring to Figure 2, a three-phase motor or generator is shown, including three phases similar to phase 100 in Figure 1. The second and third phases have rotor yokes rotated 15 and 30 degrees relative to the first phase, respectively. The three phases are mounted on the same shaft 201 such that the three torques added to the shaft 201 by the three phases are added together to generate a desired torque on the shaft. A motor controller may be used to generate the desired torque by controlling the current and adjusting the current in the three coils 204a, 204b, and 204c.

[0046] The 15-degree and 30-degree rotations represent the 120-degree and 240-degree phase differences of the electrical angle, which is defined by multiplying the mechanical angle by the number of rotor yokes.

[0047] Within the scope of this disclosure, the phase difference between two phases is further defined as the angular difference between two positions on the shaft at the positions where the rotor yoke and stator yoke are aligned for each phase, multiplied by the number of rotor yokes.

[0048] Figure 3 shows a front cross-sectional view of the motor phase in Figure 1. The U-shaped rotor yoke 303 is fixed to a flat receiving region on a part of the shaft 301a, which has an octagonal cross-section 301b. The U-shaped stator yoke 302 is fixed to a cylindrical housing 307. Figure 3 shows the rotor position with the rotor yoke and stator yoke radially aligned. In this position, the rotor yoke and stator yoke are separated by a minimum-sized air gap 305. The phase coil 304 is visible between the U-shaped rotor yokes 303. In Figure 3, it is clear that the inner diameter of the coil 304 is significantly smaller than the diameter of the air gap shown by the dashed line 307. Therefore, because the total length of the wire wound around the coil is short, the electrical resistance of the coil is relatively small with respect to the magnetic circuit excitation, which is the number of turns multiplied by the current in the coil (NI). Therefore, since the Joule heat loss in the motor is proportional to the resistance of the coil, a small coil diameter is advantageous for a given NI.

[0049] Both the stator and rotor U-shaped yokes are exposed to a variable magnetic field during the rotation of the motor / generator. To avoid eddy current losses, both the stator and rotor U-shaped yokes are laminated so that the lamination planes are parallel to the magnetic field. Figures 4 and 5 show the lamination profiles. In Figures 4 and 5, yokes with four layers of thick laminated material are shown, 401a to 401d for the U-shaped rotor yoke and 501a to 501d for the U-shaped stator yoke. For illustrative purposes, only four layers are shown in Figures 4 and 5, but in practice, many more layers are used to avoid eddy currents. Therefore, for example, a typical laminated layer of magnetic material 401a or 501a may be 0.2 mm thick.

[0050] U-shaped yokes can be manufactured at low cost using wound core manufacturing technology. A thin ribbon of magnetized material is wound around a molded part and impregnated to form a closed core. The core is then cut to produce the desired U-shaped yoke.

[0051] The motor phases according to this embodiment may be assembled in a sequence that allows the coils to be placed in the U-shaped opening of the rotor yoke.

[0052] 1: A U-shaped rotor yoke is placed on the coil, 2: The shaft is inserted between the coil center and the rotor yoke. 3. The rotor yoke is fixed to the shaft. At the end of this step, the coil is slightly movable between the rotor yokes due to the air space provided.

[0053] 4: All stator yokes are temporarily secured to the coil by temporary fasteners, which can be removed later. The fastening components used later to secure the coil to the housing are also attached to the coil at this point. At the end of this step, all motor components except the housing are at least temporarily coupled. 5: All the motor components from step 4 are inserted into the motor housing. 6: The stator yoke is fixed to the housing. 7. The coil is secured to the housing by fixed components.

[0054] Referring now to Figures 6a and 6b, Figures 6a and 6b show the coil fixing components used to secure the coil to the housing. Figure 6a is a diagram showing the arrangement of the coil fixing components, and Figure 6b is a perspective view of these components. The coil 601 is shown in an axial cross-section together with two U-shaped stator cores 602a and 602b. Between these two stator cores are two components 603 and 604 which are inserted between the motor housing 606 and the outer surface of the coil.

[0055] Component 604 fits precisely into the opening of component 603. Screw 605 is inserted into a radially provided screw hole in component 603. When the screw is tightened, it pushes down component 604, causing it to slide inside the opening of component 603. Component 603 then pushes the coil 601 radially inward. Several, i.e., at least three, similar fixing components are attached around the coil. In this way, the coil 601 is radially compressed in several positions. The coil 601 is then firmly fixed, and the coil is held firmly in place, while the rotor with the rotor yoke can rotate freely.

[0056] Figure 7 shows a rotor 700 in which the U-shaped radial portion of the yoke is shortened and replaced with a molded ring 705 made of magnetic material. The molded ring 705 is laminated, that is, it is made by stacking thin magnetic foils, each having the shape of a ring 705. There are two molded rings 705 for each rotor, each enclosing the end of the U-shaped yoke. The rotor yoke 703 is then inserted between the molded ring 705 and the shaft surface 701b.

[0057] The rotor arrangement using ring 705 can impart mechanical strength to the rotor, potentially enabling higher rotational speeds. This embodiment can be implemented in several types of motors / generators.

[0058] Referring again to Figure 1, the magnetic circuit formed by the U-shaped rotor yoke and U-shaped stator yoke traverses only magnetic material and two thin air gaps. In this way, the torque between the rotor and stator arises from the attractive force between the rotor yoke and the stator yoke. Therefore, the motor / generator shown in Figure 1 functions as a switched reluctance motor.

[0059] The advantageous features of such a switched reluctance motor according to this embodiment are a) that high torque is generated at a large air gap diameter, and b) that the electrical resistance of the coil is low due to the small diameter of the coil.

[0060] Referring here to Figure 8, an embodiment of the present invention is schematically shown, which includes permanent magnets 801a, 801b, 802a, and 802b that may be positioned at the ends of a U-shaped rotor yoke. The magnets have alternating polarity or are outward or inward as indicated by the arrows, and two magnets on the same rotor yoke, namely 802a and 802b, have opposite polarity. Thus, magnet 801a has outward polarity, magnet 801b has inward polarity, magnet 802a has inward polarity, magnet 802b has outward polarity, and so on. The stator of the motor in Figure 8 preferably has half the number of poles compared to the rotor. The motor in Figure 8 can function as a synchronous motor having permanent magnets.

[0061] As described above, the advantageous features of such a synchronous motor according to this embodiment are a) relatively high torque is generated at a large air gap diameter, and b) the electrical resistance of the coil is relatively small because the coil diameter is small.

[0062] In the embodiment shown in Figure 8, the magnets may be bonded, for example, to a U-shaped rotor yoke. When high rotational speeds are required, the centrifugal force applied to these magnets can become very large, potentially limiting the speed achievable with this motor / generator. This problem can be solved by placing the magnets on the stator. Referring now to Figure 9, Figure 9 is a simplified schematic diagram illustrating such an embodiment.

[0063] Generally, embodiments using the transverse magnetic flux structure described herein include magnets anywhere in the path of the magnetic circuit, and therefore the magnets may be located on either the rotor or the stator, or both.

[0064] Figure 9 shows an embodiment of a motor phase using magnets on a stator, specifically the main components of a single-phase stator 900 on which the magnets are mounted. The shaft and motor housing are not shown for clarity. The motor phase 900 includes 16 U-shaped stator yokes 902 and an annular coil 906 that traverses around the inwardly facing U-shaped openings of the U-shaped stator yokes. Alternating polarity magnets 903a and 903b are fixed to the U-shaped ends of the stator yokes. The polarity of magnets 903a and 903b is indicated by arrows 905. In Figure 9, only one end of the U-shaped stator yokes 902 is visible, but further magnets such as 903a-903b may be fixed to the other end of the U-shaped stator yokes. The rotor of this motor phase includes a plurality of U-shaped rotor yokes, the number of which may be equal to half the number of U-shaped rotor yokes. A motor having motor phase 900 can function as a synchronous permanent magnet motor.

[0065] The advantageous features of such a motor, as mentioned above, are a) the generation of high torque at large air gap diameters, and b) the low electrical resistance of the coils. In addition, robustness is improved by having magnets in the stator instead of the rotor.

[0066] As described above, the motor / generator phase shown in Figure 1 functions as a switched reluctance motor / generator. The attractive force between the rotor and stator is independent of the direction of the current in the coil. Therefore, this type of switched reluctance motor can be operated with a variable amplitude current flowing in only one direction. In one embodiment, this has the advantage of reducing iron losses due to hysteresis loss and eddy currents. However, in other embodiments, the current has a relatively large average value (or DC component). Therefore, the RMS value of the DC current is high, limiting the achievable efficiency.

[0067] Figure 10 shows an embodiment of a motor / generator 1000 according to an embodiment of the present invention, in which magnets 1002 are inserted into a U-shaped stator yoke 1001. The magnets are all oriented in the same direction, as indicated by arrows 1003, thereby generating magnetic flux in the magnetic circuit formed by the U-shaped rotor yoke and U-shaped stator yoke. The magnetic field generated by these magnets is equivalent to exciting a DC current in coil 1004, so that the motor / generator phase can be operated with an AC current with a lower DC component. Subsequently, the RMS value of the current is reduced, and the efficiency of the motor is improved.

[0068] In Figure 10, the magnet 1002 is inserted outside the stator yoke, but alternatively, it may be inserted at other locations in the magnetic circuit, in the stator, or in the rotor.

[0069] Referring now to Figure 11, Figure 11 shows a structure for fixing the rotor winding core around the shaft.

[0070] In Figure 11, the coil itself is not shown for clarity. During rotor assembly, the U-shaped wound core 113 is inserted from the inside of the coil and surrounds the coil in the axial direction.

[0071] As shown in Figure 11, p U-shaped wound cores 113 are positioned around the shaft for each phase and are evenly distributed.

[0072] To facilitate assembly, the mounting tool may be designed to hold all rotor cores 113 of one phase in precise position relative to the shaft 111.

[0073] Two triangular wedges 112 are inserted into the angular gaps between the rotor cores 113. These wedges have the same axial width as the rotor cores 113 in order to leave free space for the coils.

[0074] Subsequently, each wedge 112 is secured by a bolt 114. The bolt 114 may apply a radially inward force that pushes the wedge 112 inward. As it moves inward, the angular gap between the rotor cores 113 narrows, and a pressing force, schematically shown as a black arrow 115, is applied perpendicularly to the side of the rotor core 113. This pressure 115 creates a frictional force that fixes the relative position of the rotor core with respect to the shaft.

[0075] If the motor is designed for high rotor speeds, an adhesive may be used to increase the coefficient of friction between the wedge 112 and the rotor core 113.

[0076] Refer to Figure 12 here. Figure 12 is a simplified flowchart illustrating the manufacturing method of a rotating electric machine. First, for each phase, multiple U-shaped stator yokes are arranged around the annular coil. This arrangement is made such that the opening of each U-shape faces radially inward and overlaps the coil (step 120).

[0077] Subsequently, the shaft is inserted into the center defined by the annular coil (step 122). Then, the U-shaped rotor yoke is fixed to the shaft within the annular coil. Each U-shaped opening faces radially outward, and the annular coil fits within the openings of the rotor (step 124).

[0078] Subsequently, the stator yoke is secured to the annular coil by temporary fastening (step 126). The assembled assembly, including the stator yoke, annular coil, rotor yoke, and shaft, is then placed inside the housing (step 128).

[0079] Here, the stator yoke is secured to the housing (step 130). The annular coil is then secured to the housing using pre-inserted fastening components, and the temporary fastening to the annular coil is removed (step 132).

[0080] (General matters) The terms "comprises," "comprising," "includes," "including," and "having," as well as their conjugations and variations, all mean "to include, but not limited to."

[0081] The term "consisting of" means "including and limited to." As used herein, the singular forms "a," "an," and "the" include multiple referents unless the context indicates otherwise.

[0082] It is fully understood that certain features of the Invention described for clarity in the context of separate embodiments may be provided in combination in a single embodiment, and that this Spec. is to be interpreted as if such embodiments were expressly described herein. Conversely, various features of the Invention described for brevity in the context of a single embodiment may be provided separately, or in preferred partial combinations as any other described embodiment of the Invention, or as preferred. Certain features described in the context of various embodiments should not be considered essential features of those embodiments unless the embodiment would be inoperable without those elements.

[0083] Although the present invention has been described in relation to its specific embodiments, it is obvious that many alternatives, modifications, and variations will be apparent to those skilled in the art. Therefore, it is intended to encompass all such alternatives, modifications, and variations that fall within the spirit and broader scope of the appended claims.

[0084] All publications, patents, and patent applications referenced herein are incorporated herein by reference in the same manner as each individual publication, patent, and patent application is specifically and individually directed to be incorporated herein by reference. In addition, any citation or specification of any reference in this application should not be construed as an identification of such reference as prior art to the present invention. Section headings, to the extent in which they are used, should not be construed as necessarily limiting. In addition, any priority document(s) of this application are incorporated herein by reference in their entirety.

Claims

1. stator and, A central rotating shaft and a rotor attached to the central rotating shaft, wherein the rotor is axially aligned with the stator and radially inward of the stator, and a defined radial air gap exists between the stator and the rotor, An annular coil having an outer radius and an inner radius, concentric with the central rotating shaft, wherein the radial air gap is located at a predetermined air gap radius, and the inner radius of the annular coil is smaller than the predetermined air gap radius, A rotating electrical machine equipped with the following features.

2. The rotor comprises a plurality of U-shaped yokes, each of which the U-shape is oriented such that the opening of the U-shape faces radially outward, and the annular coil is at least partially housed within the rotor yoke opening. The rotating electric machine according to claim 1.

3. The stator comprises a plurality of U-shaped yokes, each of which the U-shape of the stator yoke is oriented such that the opening of the U-shape faces radially inward, and the annular coil is partially housed within the opening of the stator yoke. The rotating electric machine according to claim 1 or 2.

4. The stator is fixed to the external housing, and the annular coil is held from the external housing via a radially inward pressing element. A rotating electric machine according to any one of claims 1 to 3.

5. It comprises at least three phases, each having a phase difference from the first phase, A rotating electric machine according to any one of claims 1 to 4.

6. It is a switched reluctance machine. A rotating electric machine according to any one of claims 1 to 5.

7. The machine provides a synchronous machine, comprising alternating polarity permanent magnets attached to the ends of each rotor yoke. A rotating electric machine according to any one of claims 1 to 6.

8. The machine provides a synchronous machine, comprising alternating polarity permanent magnets attached to the ends of each stator yoke. A rotating electric machine according to any one of claims 1 to 6.

9. Each phase has a magnetic circuit extending between the stator and the rotor, and the magnetic circuit extends through the radial air gap between the stator and the rotor. A rotating electric machine according to any one of claims 1 to 6.

10. The machine provides a switched reluctance machine using alternating current, comprising permanent magnets of the same polarity arranged in the magnetic circuit. The rotating electric machine according to claim 9.

11. The aforementioned permanent magnets of the same polarity are inserted into the base of each stator yoke. The rotating electric machine according to claim 10.

12. Each phase is fitted between the stator yokes, and the wedges are pressed radially inward to push the respective stator yokes apart. A rotating electric machine according to any one of claims 1 to 11.

13. A method for manufacturing a rotating electrical machine, The process involves arranging multiple U-shaped stator yokes around an annular coil such that the openings of each U-shape face radially inward and overlap the coil, The process of inserting a shaft into the center defined by the annular coil, A step of fixing a plurality of U-shaped rotor yokes to the shaft within the annular coil, wherein the openings of each U-shape face radially outward, and the annular coil is arranged together with the openings, The steps include temporarily fixing the stator yoke to the annular coil by temporary fastening, The steps include: arranging the stator yoke together with the annular coil, the rotor yoke, and the shaft within the housing; The steps include fixing the stator yoke to the housing, The steps include: fixing the annular coil to the housing by removing the temporary fastening to the annular coil, Methods that include...

14. Each of at least one phase comprises an annular coil concentric with a central shaft and a radial air gap between an outer stator and an inner rotor at an air gap radius defining the radial spread of the rotor, wherein the annular coil is at least partially positioned within an outward-facing opening of the rotor such that the inner radius of the annular coil is smaller than the air gap radius. Rotating electrical machinery.

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