Segmented switched reluctance motor

Abstract

The present disclosure relates to a segmented switched reluctance motor, which includes a stator comprising a stator yoke and one or more pole phase set units arranged on the stator yoke, wherein the pole phase set units are arranged along a circumferential direction of the stator yoke, and wherein each pole phase set unit comprises a plurality of stator tooth portions arranged along the circumferential direction of the stator yoke, each stator tooth portion comprising a middle tooth and side teeth arranged on both sides of the middle tooth, the side teeth being spaced apart from the middle tooth to form a stator slot between the middle tooth and the side teeth, and a plurality of field windings, each of the plurality of field windings being arranged in the stator slot around the middle tooth for generating at least one pair of magnetic poles at each stator tooth portion. The switched reluctance motor of the present disclosure has a shorter magnetic circuit, and thus can improve the iron loss of the motor.

Description

Technical Field

[0001] This disclosure generally relates to the field of electric motor technology. More specifically, this disclosure relates to a segmented switched reluctance motor. Background Technology

[0002] Currently, switched reluctance motors (SRMs) are widely used in home appliances, aerospace, machinery, military and electric vehicles, among other fields, due to their advantages of simple structure, robustness, high efficiency and low manufacturing cost.

[0003] In the traditional structure of a switched reluctance motor, the stator and rotor are constructed with double salient poles. When excitation energy is applied to the stator, the switched reluctance motor can generate reluctance torque according to the magnetic structure. Furthermore, the operating principle of the switched reluctance motor follows the "principle of minimum reluctance", that is, the magnetic flux always closes along the path of minimum reluctance.

[0004] In addition, the number of poles of switched reluctance motors can also be configured in different ways. Taking the commonly used three-phase motors and four-phase motors as examples, three-phase switched reluctance motors have 6 / 4 and 12 / 8 structures, while four-phase switched reluctance motors are mostly 8 / 6 structures.

[0005] However, traditional switched reluctance motors operate with pulse power supply, which results in large instantaneous rotational pulses, especially at low speeds where the stepping motion is quite noticeable. Furthermore, in traditional switched reluctance motors, the two poles in each pair are symmetrically arranged, meaning the magnetic path between each pair must cross other poles. This leads to a longer magnetic path and consequently, higher iron losses.

[0006] Therefore, it is necessary to develop a segmented switched reluctance motor to improve the problems of large rotation pulses and large iron losses in traditional switched reluctance motors. Summary of the Invention

[0007] The purpose of this disclosure is to provide a segmented switched reluctance motor to improve the problems of large rotation pulses and large iron losses in traditional switched reluctance motors, which require the motor stator to be arranged in a circular shape.

[0008] A switched reluctance motor according to an exemplary embodiment of the present disclosure may include a stator, the stator including a stator yoke and one or more pole phase units disposed on the stator yoke, the plurality of pole phase units being arranged along the circumferential direction of the stator yoke, wherein the pole phase unit may include: a plurality of stator teeth spaced apart along the circumferential direction of the stator yoke, each stator tooth including an intermediate tooth and side teeth disposed on both sides of the intermediate tooth, the side teeth being spaced apart from the intermediate tooth to form a stator slot between the intermediate tooth and the side teeth; and a plurality of excitation windings, each of the plurality of excitation windings being disposed around the intermediate tooth in the stator slot to generate at least one pair of magnetic poles at each stator tooth.

[0009] In one exemplary embodiment, the stator teeth may have an "m" shape, and the cross-section of the side teeth may have an L shape.

[0010] In one exemplary embodiment, the number of the plurality of polar phase units can be even or odd, and the plurality of polar phase units are arranged symmetrically.

[0011] In one exemplary embodiment, the root width of the side tooth can be equal to half the root width of the middle tooth, and the tip width of the side tooth can be equal to the tip width of the middle tooth.

[0012] In one exemplary embodiment, the plurality of polar phase units are arranged either continuously or at intervals.

[0013] In one exemplary embodiment, the switched reluctance motor may further include: a rotor coaxially arranged radially inside the stator and having a plurality of rotor teeth spaced apart in a circumferential direction to form a plurality of rotor slots between adjacent rotor teeth.

[0014] In one exemplary embodiment, the tooth tip width of the rotor teeth may be equal to the tooth tip width of the intermediate teeth or the side teeth.

[0015] In one exemplary embodiment, the rotor teeth can be arranged at equal intervals in the circumferential direction, and the top width of the rotor slot can be equal to the top width of the stator slot.

[0016] In one exemplary embodiment, the top spacing between adjacent stator teeth may be less than the top width of the rotor slot.

[0017] In one exemplary embodiment, the pair of magnetic poles includes: an N pole generated on the middle tooth and an S pole generated on the side tooth; or includes: an S pole generated on the middle tooth and an N pole generated on the side tooth.

[0018] Each pole-phase unit of the segmented switched reluctance motor disclosed herein can constitute an independent motor unit. By energizing multiple phases of the pole-phase unit in a predetermined manner, continuous rotation of the motor rotor can be achieved. Furthermore, each stator tooth in the pole-phase unit and the excitation winding arranged on that stator tooth constitute one phase of the motor unit. The middle and side teeth of each phase of the motor unit can form at least one pair of magnetic poles, allowing the magnetic circuit of that phase to close directly through the stator yoke of that phase without needing to cross over the stator yokes of other phases. Therefore, the switched reluctance motor of this disclosure has a shorter magnetic circuit, thereby improving the iron loss of the motor. In addition, the number of rotor teeth in the switched reluctance motor of this disclosure is greater than that in conventional switched reluctance motors, thus reducing the step angle of the motor and improving its low-speed performance. Simultaneously, based on the short magnetic circuit switched reluctance motor, each pole-phase unit can operate independently without necessary connection to other units, thereby overcoming the limitations of interdependence and forming a more flexible and varied spatial layout. Attached Figure Description

[0019] The above and other objects, features, and advantages of exemplary embodiments of the present disclosure will become readily apparent upon reading the following detailed description with reference to the accompanying drawings. In the drawings, several embodiments of the present disclosure are illustrated by way of example and not limitation, and like or corresponding reference numerals denote like or corresponding parts, wherein:

[0020] Figure 1 This is a view showing a switched reluctance motor according to the prior art;

[0021] Figure 2 This is an axial view showing a segmented switched reluctance motor according to an exemplary embodiment of the present disclosure;

[0022] Figure 3 This is an axial view showing the stator of a segmented switched reluctance motor according to an exemplary embodiment of the present disclosure;

[0023] Figure 4 This is an axial view of the rotor of a segmented switched reluctance motor according to an exemplary embodiment of the present disclosure; and

[0024] Figure 5 This is a partial enlarged view showing a segmented switched reluctance motor according to an exemplary embodiment of the present disclosure. Detailed Implementation

[0025] The technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this disclosure, and not all of them. Based on the embodiments of this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0026] A switched reluctance motor (SRM) is a new type of electronically commutated motor (EC motor) with a wide speed range. Figure 1 A schematic diagram illustrating the working principle of a switched reluctance motor according to the prior art is shown. For example... Figure 1 As shown, a traditional four-phase switched reluctance motor has four pairs of magnetic poles arranged symmetrically about the stator axis: A-A', B-B', C-C', and D-D'. These four pairs of magnetic poles constitute the four phases of the motor, and two magnetic poles in each pair are connected in series with excitation windings wound in opposite directions. When a voltage is applied to the excitation windings of the pair of magnetic poles, the two magnetic poles generate the "N" pole and "S" pole of the excitation magnetic field, respectively.

[0027] Further as Figure 1 As shown, when voltage is applied to phase A-A', the stator and rotor teeth centerlines of phase A-A' are aligned, and the magnetic flux of the excitation magnetic field closes through the stator teeth, rotor teeth, rotor yoke, and stator yoke, thus the motor does not rotate. When voltage is applied to phase B-B', the stator and rotor teeth centerlines of phase B-B' are not aligned, and since magnetic flux always closes along the path of least magnetic resistance, the two energized magnetic poles will find the nearest magnetic conductor to close the magnetic flux, achieving minimum magnetic resistance. In this way, the two energized magnetic poles attract the rotor teeth, causing the rotor teeth closest to phase B-B' to move to a position aligned with the stator teeth, thereby enabling the motor rotor to generate torque and rotate counterclockwise.

[0028] Similarly, if phases A-A', B-B', C-C', and D-D' are energized sequentially, the magnetic field will move clockwise along the circumferential direction of the stator, while the rotor will rotate counterclockwise along the circumferential direction. If the three phases are energized in this sequence, continuous rotation of the motor rotor can be achieved.

[0029] Furthermore, as mentioned above, if the centerlines of the rotor teeth and stator teeth coincide, the magnetic flux of the excitation magnetic field will be in a state of minimum magnetic reluctance. At this point, the rotor position will not change. Therefore, the number of rotor tooth poles and the number of stator magnetic poles generally have a certain regular phase difference. Taking traditional three-phase and four-phase motors as examples, three-phase switched reluctance motors can have 6 / 4 and 12 / 8 structures, while four-phase switched reluctance motors can have 8 / 6 structures.

[0030] Therefore, it is evident that traditional switched reluctance motors have a low rotor pole arc coefficient, resulting in larger instantaneous rotational pulses during operation, especially at lower speeds where the stepping behavior is more pronounced. Furthermore, because the two poles in each pair of magnetic poles in a traditional switched reluctance motor are arranged radially opposite each other, the magnetic circuit between each pair of poles must pass through the pole yokes of other phases to form a closed magnetic circuit. This means that the more phases a traditional switched reluctance motor has, the longer its magnetic circuit becomes, leading to higher iron losses.

[0031] Therefore, in order to solve at least one of the above-mentioned technical problems, this disclosure provides a switched reluctance motor, so that the motor has better efficiency and low-speed performance.

[0032] The specific embodiments of this disclosure will now be described in detail with reference to the accompanying drawings.

[0033] Figure 2 This is an axial view showing a switched reluctance motor according to an exemplary embodiment of the present disclosure, and Figure 3 This is an axial view showing the stator of a switched reluctance motor according to an exemplary embodiment of the present disclosure.

[0034] like Figure 2 and Figure 3 As shown, an exemplary embodiment of this disclosure provides a switched reluctance motor, which may include a stator 10, the stator 10 including: one or more pole phase group units 100 and a stator yoke 200, the one or more pole phase group units 100 being disposed on the stator yoke 200, wherein the plurality of pole phase group units 100 are arranged at predetermined angles along the circumferential direction of the stator yoke 200. Specifically, the aforementioned pole phase unit 100 may include: a plurality of stator teeth 110 and a plurality of excitation windings 120. The plurality of stator teeth 110 are arranged at intervals along the circumferential direction of the stator yoke 200. Each stator tooth 110 includes an intermediate tooth 111 and side teeth 112 arranged on both sides of the intermediate tooth 111. The side teeth 112 are spaced apart from the intermediate tooth 111 to form a stator slot 113 between the intermediate tooth 111 and the side teeth 112. Each of the plurality of excitation windings 120 is arranged around the intermediate tooth 111 in the stator slot 113 to generate at least one pair of magnetic poles at each stator tooth 110.

[0035] Specifically, such as Figure 2 and Figure 3 As shown, a switched reluctance motor according to an exemplary embodiment of this disclosure may include a stator 10, which may include a stator yoke 200 and one or more pole phase units 100. The stator yoke 200 may have an annular shape and may have an inner circumferential surface and an outer circumferential surface. The pole phase unit 100 may include a plurality of stator teeth 110, which may be integrally formed on the inner circumferential surface of the stator yoke 200. In an exemplary embodiment, the stator teeth 110 may include an intermediate tooth 111 and two side teeth 112. The two side teeth 112 may be spaced apart on both sides of the intermediate tooth 111, such that two stator slots 113 are formed between the intermediate tooth 111 and the two side teeth 112, respectively. The stator slots 113 may be used to house the excitation winding 120 of the switched reluctance motor. Furthermore, in an exemplary embodiment, the middle tooth 111 and the two side teeth 112 of the stator tooth portion 110 can be arranged together with the stator yoke portion 200 to form a generally "mountain" shape or a generally "m" shape, which can maximize the placement space of the excitation winding.

[0036] Depending on the implementation, the plurality of pole phase units 100 of the present invention may be arranged continuously or at intervals. Thus, the plurality of pole phase units of the present invention may include, for example, independent units, combined units, and / or combinations of both.

[0037] Further as Figure 2 As shown, the aforementioned pole phase unit 100 may further include a plurality of excitation windings 120, each of which may be arranged in a stator slot 113 surrounding the intermediate tooth 111 of each of the plurality of stator teeth 110. When the excitation winding 120 is powered on, it generates an excitation magnetic field that can generate magnetic poles of opposite polarity on the intermediate teeth 111 and the side teeth 112 of the stator teeth 110. In an exemplary embodiment, the generation of magnetic poles of opposite polarity may involve generating an N pole on the intermediate tooth 111 and an S pole on the two side teeth 112. Alternatively, by changing the winding direction of the excitation winding 120, an S pole may be generated on the intermediate tooth 111 and an N pole on the two side teeth 112.

[0038] Therefore, it can be understood that in the switched reluctance motor of this disclosure, the magnetic poles generated on the intermediate teeth 111 and the magnetic poles generated on the side teeth 112 can form a pair of magnetic poles. This allows each stator tooth 110 of the switched reluctance motor of this disclosure and the excitation winding 120 arranged in that stator tooth 110 to constitute one phase of the switched reluctance motor. Furthermore, this arrangement allows only one phase of the excitation winding 120 to be placed in each of the two stator slots 113 of each stator tooth 110, eliminating the problems of phase-to-phase insulation and phase-to-phase gaps. Therefore, the slot fill factor of the stator slots 113 can be increased, thereby improving the utilization rate of the stator teeth.

[0039] Figure 4 This is an axial view of the rotor of a segmented switched reluctance motor according to an exemplary embodiment of the present disclosure. Further as... Figure 2 and Figure 4 As shown, in one exemplary embodiment, the segmented switched reluctance motor according to an exemplary embodiment of the present disclosure may further include: a rotor 30, which is coaxially arranged radially inside the stator 10 and has a plurality of rotor teeth 310, the plurality of rotor teeth 310 being spaced apart in a circumferential direction to form a plurality of rotor slots 320 between adjacent rotor teeth 310.

[0040] Specifically, the rotor 30 described above may include a shaft and a rotor core. The shaft serves as the output shaft of the motor, and the rotor core may be fitted onto the shaft by heat fitting or key connection. The rotor core may include a rotor yoke 330 and a plurality of rotor teeth 310. The rotor yoke 330 may have an annular shape and may have an outer circumferential surface and an inner circumferential surface. The plurality of rotor teeth 310 may be integrally formed on the outer circumferential surface of the rotor yoke 330 and may be arranged at predetermined intervals along the circumferential direction of the rotor yoke 330 to form rotor slots 320 between adjacent rotor teeth 310. Here, it can be understood that the aforementioned predetermined angle may refer to the angle between adjacent rotor teeth 310 and the axis of the motor.

[0041] Therefore, it can be understood that the magnetic circuit of each phase of the segmented switched reluctance motor disclosed herein can be closed directly through the stator teeth 110 and stator yoke 200 of that phase and the rotor teeth 310 and rotor yoke 330 opposite to that phase, without needing to cross the stator yoke 200 of other phases, thereby shortening the magnetic circuit of the motor and reducing the iron loss of the motor.

[0042] Figure 5 This is a partially enlarged view illustrating a segmented switched reluctance motor according to an exemplary embodiment of the present disclosure. Further details will be provided below. Figure 2 and Figure 5The operation of the segmented switched reluctance motor of this disclosure is described. For example... Figure 2 As shown, the pole phase group unit 100 of the segmented switched reluctance motor disclosed herein may include phase A1, phase B1, and phase C1. When the excitation winding 120 of phase A1 of the pole phase group unit 100 is energized, the excitation winding 120 of phase A1 can generate an excitation magnetic field. Since the middle tooth 111 and the two side teeth 112 of the stator tooth portion 110 of phase A1 are completely aligned with the three rotor teeth 310, the rotor 30 of the motor does not rotate at this time, and a magnetic circuit is formed at the stator tooth portion 110 and the corresponding three rotor teeth 310. The distribution of the magnetic circuit is as follows: Figure 5 As shown.

[0043] In this exemplary embodiment, such as Figure 5 As shown, the magnetic circuit described above may include a double circuit symmetrical to each other with respect to the intermediate teeth 111 of the stator tooth portion 110. The double circuit may include a first circuit and a second circuit, wherein the first circuit is closed by the intermediate teeth 111 of the stator tooth portion 110, the rotor tooth portion 310 opposite to the intermediate teeth 111, the rotor yoke portion 330, the rotor tooth portion 310 opposite to the first side tooth 112a, the first side tooth 112a, and the stator yoke portion 200 connecting the intermediate teeth 111 and the first side tooth 112a; while the second circuit is closed by the intermediate teeth 111 of the stator tooth portion 110, the rotor tooth portion 310 opposite to the intermediate teeth 111, the rotor yoke portion 330, the rotor tooth portion 310 opposite to the second side tooth 112b, the second side tooth 112b, and the stator yoke portion 200 connecting the intermediate teeth 111 and the second side tooth 112b.

[0044] Furthermore, such as Figure 2 As shown, when the excitation winding 120 of phase A1 is de-energized and the excitation winding 120 of phase B1 is energized, the excitation winding 120 of phase B1 can generate an excitation magnetic field. Since the middle tooth 111 and the two side teeth 112 of the stator tooth 110 of phase B1 are not fully aligned with the three rotor teeth 310, the excitation magnetic field generated by phase B1 can attract the three nearest rotor teeth 310, causing these three rotor teeth 310 to rotate to positions aligned with the middle tooth 111 and the side teeth 112 of phase B1, respectively. This allows the rotor 30 to generate torque and rotate counterclockwise.

[0045] Similarly, de-energizing the excitation winding 120 of phase B1 and energizing the excitation winding 120 of phase C1 can cause the rotor 30 to rotate further counterclockwise. Therefore, it can be understood that in this exemplary embodiment, if phases A1, B1, and C1 are energized one-phase at a time in the order of A1-B1-C1-A1, the rotor 30 of the segmented switched reluctance motor of this disclosure can rotate continuously in the counterclockwise direction.

[0046] Therefore, it can be understood that each pole phase group unit 100 of the segmented switched reluctance motor of this disclosure can constitute a motor unit. By sequentially energizing the three phases of the pole phase group unit 100, continuous rotation of the motor rotor 30 can be achieved. Thus, the segmented switched reluctance motor of this disclosure has the advantage of simple structure. In addition, in the segmented switched reluctance motor of this disclosure, each phase in the pole phase group unit 100 can generate at least one pair of magnetic poles and can form a closed magnetic circuit with the corresponding rotor teeth 310 and rotor yoke 330. There is no interference or influence between phases, thus saving installation space and enhancing the stability of motor operation.

[0047] Based on the above description, those skilled in the art will understand that, building upon the short magnetic circuit switched reluctance motor, the segmented switched reluctance motor of this disclosure allows each pole phase unit to operate independently without necessary connection to other pole phase units. This overcomes the limitation of interdependence, resulting in a more flexible and versatile spatial layout. Furthermore, the segmented switched reluctance motor of this disclosure leverages the advantage of a short magnetic circuit without interdependence, with each unit independently segmented, overcoming the limitation that the motor stator must be arranged in a complete circle, thereby broadening the application range of the motor.

[0048] Additionally, it is understood that although this disclosure exemplarily describes each pole phase unit 100 as including 3 phases (or 3 stator teeth 110), this disclosure is not intended to limit the number of phases or the number of stator teeth 110 included in each pole phase unit 100. Those skilled in the art can select any number of phases or stator teeth 110 as needed, and can calculate the angle θ between adjacent phases according to the formula θ = 360 / m / Zr, where m is the number of stator phases and Zr is the number of rotor teeth.

[0049] Furthermore, the segmented switched reluctance motor according to the exemplary embodiments of this disclosure may further include a plurality of pole phase group units 100, which may be arranged at equal intervals on the inner circumferential surface of the stator yoke 200 along the circumferential direction, and each of the plurality of pole phase group units 100 may include three stator teeth 110. For example, as Figure 2As shown, four pole phase group units 100 can be configured, and these four pole phase group units 100 can be arranged at 90° intervals on the inner circumferential surface of the stator yoke 200. Depending on the implementation scenario, this arrangement can be continuous or intermittent. Specifically, during the operation of the switched reluctance motor including the four pole phase group units 100, phases A1, A3, A5, and A7 can be simultaneously energized and de-energized, phases B1, B3, B5, and B7 can also be simultaneously energized and de-energized, and phases C1, C3, C5, and C7 can also be simultaneously energized and de-energized, which can increase the torque of the motor.

[0050] Therefore, it can be understood that, depending on the application requirements of the switched reluctance motor in different situations, the pole phase group units to be arranged can be arbitrarily selected, and the output power and torque of the motor can be changed by the number of pole phase group units 100. For example, only phases A1, A3, A5, A7 and phases B1, B3, B5, B7 and phases C1, C3, C5, C7 can be arranged. Another example is that only phases A1 and A5, phases B1 and B5, and phases C1 and C5 can be arranged, thereby reducing the motor torque to half or a quarter compared to the case using eight pole phase group units 100. Furthermore, due to the symmetrical arrangement, asymmetrical torque is not generated. In an exemplary embodiment, the selected on and off pole phase group units 100 can be arranged at equal angular intervals on the stator yoke 200, which can prevent the rotor 30 from vibrating due to uneven force.

[0051] Furthermore, such as Figure 2 As shown, the width of the rotor slot 320 of the segmented switched reluctance motor of this disclosure can be equal to the width of the stator slot 113, and the pole arc coefficient of the stator tooth 110 can be designed to be 0.5, so that the pole arc coefficient of the rotor tooth 310 can also be designed to be 0.5 or slightly higher than 0.5. Therefore, the rotor pole arc coefficient of the switched reluctance motor of this disclosure is higher than that of the conventional switched reluctance motor.

[0052] For example, such as Figure 2 As shown, each pole phase unit 100 of the segmented switched reluctance motor according to this exemplary embodiment can have three phases, and each phase can have three stator teeth (one intermediate tooth 111 and two side teeth 112). Therefore, each pole phase unit 100 can have a total of 3*3=9 stator teeth, and the rotor portion corresponding to the pole phase unit 100 can include 8 rotor teeth 310. Therefore, when the motor has 4 pole phase units 100, the stator 10 of the motor can have a total of 9*4=36 stator teeth. Since each pole phase unit 100 occupies 1 / 8 of the inner circumferential surface of the stator yoke 200, the rotor 30 can have a total of 8*8=64 rotor teeth 310.

[0053] Therefore, it can be understood that the number of rotor teeth of the segmented switched reluctance motor of this disclosure can be higher than that of the conventional switched reluctance motor, thereby reducing the step angle of the motor and thus reducing the torque pulse of the motor. Therefore, the switched reluctance motor of this disclosure can have improved low-speed performance.

[0054] It is further understood that although the operating principle of a switched reluctance motor including four pole phase group units 100 has been exemplarily described in the above embodiments, this disclosure is not intended to limit the number of pole phase group units 100. Those skilled in the art can select any number of pole phase group units 100 as needed. Specifically, the number of pole phase group units 100 can be even or odd; they can be arranged symmetrically without being limited by the circular structure of the motor stator. Regarding the combination of pole phase group units, it can include even-number combinations, odd-number combinations, symmetrical arrangements, or non-circular layouts, etc. For example, three, five, or six pole phase group units 100 can be selected, and the angle between adjacent pole phase group units 100 can be obtained by dividing 360 degrees by the number of pole phase group units 100.

[0055] Furthermore, such as Figure 3 As shown, in an exemplary embodiment, the root width of the side teeth 112 of the stator tooth portion 110 can be equal to half the root width of the intermediate teeth 111, and the intermediate teeth 111 can be parallel teeth. It is understood that since the magnetic flux of the intermediate teeth 111 is twice that of the side teeth 112, designing the root width of the side teeth 112 to be half the width of the intermediate teeth 111 can increase the placement space of the excitation winding 120.

[0056] like Figure 3 As shown, in an exemplary embodiment, the cross-section of the side teeth 112 of the stator tooth portion 110 can have an L-shaped shape, and the tooth tip width of the side teeth 112 can be equal to the tooth tip width of the intermediate teeth 111. Further, the tooth tip width of the rotor tooth portion 310 can be equal to the tooth tip width of either the intermediate teeth 111 or the side teeth 112, and the rotor tooth portion 310 can be parallel teeth. It is understood that this arrangement allows the tooth tip widths of the rotor tooth portion 310, the intermediate teeth 111, and the side teeth 112 to all be the same.

[0057] Further as Figure 3As shown, in an exemplary embodiment, rotor teeth 310 can be arranged at equal intervals along the circumferential direction of rotor 30, and the top width of rotor slot 320 can be equal to the top width of stator slot 113. Furthermore, in an exemplary embodiment, the tooth tip spacing between adjacent stator teeth 110 can be less than the top width of rotor slot 320. It is understood that this arrangement of rotor teeth 310 allows the tooth tips of the middle tooth 111 and the two side teeth 112 of a stator tooth 110 to be completely aligned with the tooth tips of the three rotor teeth 310 when a stator tooth 110 of a certain phase is aligned with the three rotor teeth 310, while stator teeth 110 adjacent to the stator tooth 110 are not aligned with the rotor teeth 310.

[0058] In conjunction with the various exemplary embodiments described above, those skilled in the art will understand that this disclosure has at least the following beneficial effects.

[0059] On the one hand, each pole phase group unit of the segmented switched reluctance motor disclosed herein can constitute an independent motor unit. By switching multiple phases of the pole phase group unit on and off in a predetermined manner, continuous rotation of the motor rotor can be achieved. Therefore, the switched reluctance motor disclosed herein has the advantage of simple structure. In addition, each stator tooth of the switched reluctance motor disclosed herein and the excitation winding arranged on the stator tooth constitute one phase of the motor. The middle tooth and the side tooth of each phase constitute at least one pair of magnetic poles, so that the magnetic circuit of the phase can be directly closed through the stator tooth and stator yoke of the phase and the rotor tooth and rotor yoke opposite to the phase, without having to cross the stator yoke of other phases. Therefore, the magnetic circuit of the motor can be shortened, thereby reducing the iron loss of the motor.

[0060] On the other hand, the rotor pole arc coefficient of the segmented switched reluctance motor disclosed herein is higher than that of the conventional switched reluctance motor. Therefore, the number of rotor teeth of the switched reluctance motor disclosed herein is higher than that of the conventional switched reluctance motor, thereby reducing the step angle of the motor and reducing the torque pulse of the motor. This allows the switched reluctance motor disclosed herein to have improved low-speed performance.

[0061] Furthermore, the segmented switched reluctance motor disclosed herein offers flexible and convenient layout options. It can be combined with an independent unit into several different layout configurations, thereby creating a series of products with varying power, torque, and speed. This significantly reduces manufacturing, management, and maintenance costs. Additionally, because the segmented switched reluctance motor of this disclosure is self-contained and its mechanical and electrical connections are flexible and adaptable, it can be independently installed using the structural components of the driven machinery, further reducing costs.

[0062] In the foregoing description of this specification, unless otherwise expressly specified and limited, the terms "fixed," "installed," "connected," or "linked" should be interpreted broadly. For example, the term "linked" can refer to a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; or it can refer to the internal communication of two components or the interaction between two components. Therefore, unless otherwise expressly limited in this specification, those skilled in the art can understand the specific meaning of the above terms in this disclosure based on the specific circumstances.

[0063] Based on the above description in this specification, those skilled in the art will also understand that terms used to indicate orientation or positional relationship, such as "upper," "lower," "front," "rear," "left," "right," "length," "width," "thickness," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," "circumferential," "center," "longitudinal," "transverse," "clockwise," or "counterclockwise," are based on the orientation or positional relationship shown in the accompanying drawings of this specification. They are only for the purpose of facilitating the explanation of the present disclosure and simplifying the description, and do not imply that the device or element involved must have the specific orientation, or be constructed and operated in the specific orientation. Therefore, the above-mentioned orientation or positional relationship terms should not be understood or interpreted as a limitation of the present disclosure.

[0064] Furthermore, the terms "first" or "second," etc., used in this specification to refer to numbers or ordinal numbers are for descriptive purposes only and should not be construed as indicating, explicitly or implicitly, relative importance or specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this specification, "a plurality of" means at least two, such as two, three, or more, unless otherwise explicitly specified.

[0065] While various embodiments of this disclosure have been shown and described in this specification, it will be apparent to those skilled in the art that such embodiments are provided by way of example only. Many modifications, alterations, and alternatives will occur to those skilled in the art without departing from the spirit and intent of this disclosure. It should be understood that various alternatives to the embodiments of this disclosure described herein may be employed in the practice of this disclosure. The appended claims are intended to define the scope of this disclosure and therefore cover modular compositions, equivalents, or alternatives within the scope of these claims.

Claims

1. A segmented switched reluctance motor, comprising a stator, the stator including a stator yoke and a portion disposed on the stator. One or more pole phase units on the yoke, wherein the plurality of pole phase units are arranged along the circumferential direction of the stator yoke, wherein... The polar phase unit includes: The stator includes a plurality of stator teeth spaced apart along the circumferential direction of the stator yoke, each stator tooth including a central tooth and side teeth arranged on both sides of the central tooth, the side teeth being spaced apart from the central tooth to form a stator slot between the central tooth and the side teeth; and a plurality of excitation windings, each of the plurality of excitation windings being arranged around the central tooth in the stator slot to generate at least one pair of magnetic poles at each stator tooth. The plurality of polar phase units are arranged continuously or at intervals; The stator teeth have an "m" shape, and the side teeth have an L-shaped cross-section. Further comprising: a rotor, which is coaxially arranged on the radially inner side of the stator and has a plurality of rotor teeth, the plurality of rotor teeth being spaced apart in a circumferential direction to form a plurality of rotor slots between adjacent rotor teeth; Wherein, the tooth tip width of the rotor tooth portion is equal to the tooth tip width of the intermediate tooth or the side tooth; The rotor teeth are arranged at equal intervals along the circumferential direction, and the top width of the rotor slot is equal to the top width of the stator slot.

2. The segmented switched reluctance motor according to claim 1, wherein, The number of the plurality of polar phase units is even or odd, and the plurality of polar phase units are arranged symmetrically.

3. The segmented switched reluctance motor according to claim 1, wherein, The root width of the side tooth is equal to half the root width of the middle tooth, and the tip width of the side tooth is equal to the tip width of the middle tooth.

4. The segmented switched reluctance motor according to claim 1, wherein, The top spacing between adjacent stator teeth is less than the top width of the rotor slot.

5. The segmented switched reluctance motor according to any one of claims 1-4, wherein, The pair of magnetic poles includes: an N pole generated on the middle tooth and an S pole generated on the side tooth; or includes: an S pole generated on the middle tooth and an N pole generated on the side tooth.

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