Short magnetic circuit switched reluctance motor

Abstract

The present disclosure relates to a short magnetic path switched reluctance motor, which can include a stator including a stator yoke portion and a plurality of stator tooth portions, the stator tooth portions including 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 tooth slot between the middle tooth and the side teeth; a rotor coaxially arranged radially inside the stator and having a plurality of rotor tooth portions arranged spaced apart in a circumferential direction of the rotor to form a rotor tooth slot between adjacent rotor tooth portions; and a plurality of field windings each of which is arranged in the stator tooth slot around the middle tooth for generating magnetic poles of opposite polarity on the middle tooth and the side teeth. The short magnetic path switched reluctance motor of the present disclosure has a shorter magnetic path and a smaller step angle, and thus can reduce iron loss of the motor and can improve low speed performance of the motor.

Description

TECHNICAL FIELD

[0001] The present disclosure relates generally to the technical field of electric machines. More particularly, the present disclosure relates to a short magnetic circuit switched reluctance motor. BACKGROUND

[0002] At present, switched reluctance motors (SRM) are widely used in household appliances, aerospace, mechanical equipment, military and electric vehicles, etc. fields, which have the advantages of simple structure, firmness, high efficiency and low manufacturing cost.

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

[0004] In addition, the number of poles of the switched reluctance motor can also have different combinations. For example, the commonly used three-phase motor and four-phase motor, among which the three-phase switched reluctance motor has a 6 / 4 structure and a 12 / 8 structure, and the four-phase switched reluctance motor is mostly an 8 / 6 structure.

[0005] However, the conventional switched reluctance motor works in a pulse power supply mode, which makes the conventional switched reluctance motor have a large instantaneous rotation pulse, especially when the motor speed is low, the stepping state is more obvious. In addition, in the conventional switched reluctance motor, the two poles in each pair of poles are arranged symmetrically with each other, so that the magnetic circuit between each pair of poles has to cross other poles, resulting in a longer magnetic circuit of the conventional switched reluctance motor, and thus resulting in a larger iron loss of the magnetic circuit.

[0006] Therefore, it is necessary to develop a switched reluctance motor to improve the problems of large rotation pulse and large iron loss of the conventional switched reluctance motor. SUMMARY

[0007] The purpose of the present disclosure is to provide a short magnetic circuit switched reluctance motor to improve the problems of large rotation pulse and large iron loss of the conventional switched reluctance motor.

[0008] A short magnetic circuit switched reluctance motor according to an exemplary embodiment of the present disclosure can include a stator including a stator yoke portion and a plurality of stator tooth portions, the stator tooth portions including 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 tooth slot between the middle tooth and the side teeth; a rotor coaxially arranged on a radially inner side of the stator and having a plurality of rotor tooth portions arranged at equal intervals in a circumferential direction of the rotor to form a rotor tooth slot between adjacent rotor tooth portions; and a plurality of field windings each of which is arranged in the stator tooth slot around the middle tooth for generating magnetic poles of opposite polarity on the middle tooth and the side teeth.

[0009] In an exemplary embodiment, the stator tooth portion can have a "mountain" shape.

[0010] In an exemplary embodiment, an N pole can be generated on the middle tooth and an S pole can be generated on the side tooth; or an S pole can be generated on the middle tooth and an N pole can be generated on the side tooth.

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

[0012] In an exemplary embodiment, a cross section of the side tooth can have an L shape.

[0013] In an exemplary embodiment, a tooth top width of the side tooth can be equal to a tooth top width of the middle tooth.

[0014] In an exemplary embodiment, a tooth top width of the rotor tooth portion can be equal to a tooth top width of the middle tooth.

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

[0016] In an exemplary embodiment, the plurality of stator tooth portions can be arranged at equal intervals on an inner circumferential surface of the stator yoke portion in a circumferential direction of the stator.

[0017] In an exemplary embodiment, a tooth top interval between adjacent stator tooth portions can be less than the slot top width of the rotor tooth slot.

[0018] The short magnetic path switched reluctance motor of the present disclosure can make the middle teeth and the side teeth of each phase constitute a pair of magnetic poles by configuring the stator tooth portion of each phase to include middle teeth and side teeth, and by arranging the excitation winding in the stator tooth slot, and further make the magnetic circuit of the phase directly pass through the stator tooth portion and the stator yoke portion of the phase, and the rotor tooth portion and the rotor yoke portion opposite to the phase, and close without crossing the other phases, so the short magnetic path switched reluctance motor of the present disclosure has a shorter magnetic circuit, thereby improving the iron loss of the motor. In addition, the rotor tooth number of the short magnetic path switched reluctance motor of the present disclosure is greater than that of the conventional switched reluctance motor, so the step angle of the motor can be reduced, thereby improving the low speed performance of the motor. BRIEF DESCRIPTION OF DRAWINGS

[0019] The above and other objects, features and advantages of the exemplary embodiments of the present disclosure will be more apparent from the following detailed description taken in conjunction with the accompanying drawings, which illustrate several embodiments of the present disclosure by way of example and not limitation. In the drawings, like reference numerals refer to like elements, and the same or similar components are designated by the same or similar reference numerals throughout the several views, wherein:

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

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

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

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

[0024] Figure 5 is a partial enlarged view showing a short magnetic path switched reluctance motor according to an exemplary embodiment of the present disclosure. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present disclosure will be described clearly and completely below with reference to the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are part of, rather than all of, the embodiments of the present disclosure. Based on the embodiments in the present disclosure, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present disclosure.

[0026] Switched Reluctance Motor (SRM) is a new type of Electronic Commutation Motor (EC Motor) with a large speed range, Figure 1 A schematic diagram showing the working principle of a switched reluctance motor according to the prior art is shown. As shown in Figure 1 The stator of a conventional four-phase switched reluctance motor has four pairs of magnetic poles arranged symmetrically about the axis of the stator: A-A', B-B', C-C', and D-D', which form four phases of the motor, and each pair of magnetic poles has two magnetic poles with opposite winding directions, and when a voltage is applied to the exciting winding of the pair of magnetic poles, the two magnetic poles generate "N" and "S" poles of the exciting magnetic field, respectively.

[0027] Further as shown in Figure 1 When a voltage is applied to the A-A' phase, since the center lines of the stator teeth and the rotor teeth of the A-A' phase are aligned at this time, the magnetic flux of the exciting magnetic field is closed through the stator teeth, the rotor teeth, the rotor yoke, and the stator yoke, so the motor does not rotate. When a voltage is applied to the B-B' phase, since the center lines of the stator teeth and the rotor teeth of the B-B' phase are not aligned at this time, and the magnetic flux always closes along the path with the smallest magnetic resistance, the two energized magnetic poles will find the nearest magnetic conductor to close the magnetic flux to achieve the smallest magnetic resistance. In this way, the two energized magnetic poles will attract the rotor teeth, and the rotor teeth closest to the B-B' phase will move to a position aligned with the stator teeth, so that the rotor of the motor can generate torque and rotate counterclockwise.

[0028] Similarly, if the A-A' phase, the B-B' phase, the C-C' phase, and the D-D' phase are energized in turn, the magnetic field will move clockwise in the circumferential direction of the stator, and the rotor will rotate counterclockwise in the circumferential direction. If the energization is performed in this order for three-phase cycles, continuous rotation of the rotor of the motor can be achieved.

[0029] In addition, as mentioned above, if the center lines of the rotor teeth and the stator teeth coincide, the magnetic flux of the exciting magnetic field will be in the state of minimum magnetic resistance, and at this time the position of the rotor will not change, so the number of tooth poles of the rotor and the number of magnetic poles of the stator generally have a certain regular difference. Taking a conventional three-phase motor and a four-phase motor as an example, a three-phase switched reluctance motor can have a 6 / 4 structure and a 12 / 8 structure, and a four-phase switched reluctance motor can have an 8 / 6 structure.

[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 short magnetic circuit 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 short magnetic circuit switched reluctance motor according to an exemplary embodiment of the present disclosure.

[0034] like Figure 2 As shown, an exemplary embodiment of this disclosure provides a short magnetic circuit switched reluctance motor, which may include: a stator 100, a rotor 200 and a plurality of excitation windings 300, wherein the stator 100 includes a stator yoke 110 and a plurality of stator teeth 120, the stator teeth 120 including an intermediate tooth 121 and side teeth 122 arranged on both sides of the intermediate tooth 121, the side teeth 122 being spaced apart from the intermediate tooth 121 to form a stator tooth groove 123 between the intermediate tooth 121 and the side teeth 122.

[0035] Specifically, such as Figure 2 and Figure 3As shown, the short magnetic path switched reluctance motor according to the exemplary embodiment of the present disclosure can include a stator 100, which can include a stator yoke portion 110 and a stator tooth portion 120, the stator yoke portion 110 can have a ring shape and can have an inner circumferential surface and an outer circumferential surface, and the stator tooth portion 120 can be integrally formed on the inner circumferential surface of the stator yoke portion 110. In one exemplary embodiment, the stator tooth portion 120 can include a middle tooth 121 and two side teeth 122, which can be arranged at both sides of the middle tooth 121 at intervals, such that two stator tooth slots 123 are formed between the middle tooth 121 and the two side teeth 122, respectively, and the stator tooth slots 123 can be used to place an excitation winding 300 of the short magnetic path switched reluctance motor. In addition, in one exemplary embodiment, the middle tooth 121 and the two side teeth 122 of the stator tooth portion 120 can form a substantially "mountain" shape together with the stator yoke portion 110, or form a substantially "m" shape, and such an arrangement can maximize the placement space of the excitation winding 300.

[0036] Figure 4 is an axial view showing a rotor of the short magnetic path switched reluctance motor according to the exemplary embodiment of the present disclosure.

[0037] Further as Figure 2 and Figure 4 shown, the short magnetic path switched reluctance motor according to the exemplary embodiment of the present disclosure can further include a rotor 200, which can include a rotor shaft serving as an output shaft of the motor and a rotor core, which can be fitted on the rotor shaft in a hot fit manner or a key connection manner. The rotor core can include a rotor yoke portion 210 and a plurality of rotor tooth portions 220, the rotor yoke portion 210 can have a ring shape and can have an outer circumferential surface and an inner circumferential surface, and the plurality of rotor tooth portions 220 can be integrally formed on the outer circumferential surface of the rotor yoke portion 210 and can be arranged at predetermined pole angles at equal intervals along the circumferential direction of the rotor yoke portion 210 to form rotor tooth slots 230 between adjacent rotor tooth portions 220. Here, it can be understood that the above-mentioned pole angle can refer to the angle at which adjacent rotor tooth portions 220 are spaced apart with respect to the axis of the motor.

[0038] Further as Figure 2As shown, the short magnetic circuit switched reluctance motor according to an exemplary embodiment of this disclosure may further include a plurality of excitation windings 300, each of which may be arranged in a stator slot 123 around the intermediate tooth 121 of the stator tooth portion 120. When the excitation winding 300 is powered on, it can generate an excitation magnetic field that can generate magnetic poles of opposite polarity on the intermediate tooth 121 and the side teeth 122 of the stator tooth portion 120. In one embodiment, the magnetic poles of opposite polarity may be generated as N poles on the intermediate tooth 121 and S poles on the two side teeth 122. Alternatively, by changing the winding direction of the excitation winding 300, it is possible to generate S poles on the intermediate tooth 121 and N poles on the two side teeth 122.

[0039] Therefore, it can be understood that in the short magnetic circuit switched reluctance motor of this disclosure, the magnetic poles generated on the intermediate teeth 121 and the magnetic poles generated on the side teeth 122 can form a pair of magnetic poles. This allows each stator tooth 120 of the short magnetic circuit switched reluctance motor of this disclosure to form a phase of the motor with the excitation winding 300 arranged in that stator tooth 120. Therefore, the magnetic circuit of each phase of the short magnetic circuit switched reluctance motor of this disclosure can be directly closed through the stator teeth and stator yoke of that phase, as well as the rotor teeth and rotor yoke opposite to that phase, without needing to cross the stator yoke of other phases. This shortens the magnetic circuit of the motor and reduces iron losses. Furthermore, this arrangement allows only one phase excitation winding 300 to be placed in each of the two stator slots 123 of each stator tooth 120, eliminating the problems of phase-to-phase insulation and phase-to-phase gaps. This increases the slot fill factor of the stator slots 123, thereby improving the utilization rate of the stator teeth.

[0040] Figure 5 This is a partially enlarged view illustrating a short magnetic circuit switched reluctance motor according to an exemplary embodiment of the present disclosure. Further details will be provided below. Figure 2 and Figure 5 The operation of the short magnetic circuit switched reluctance motor of this disclosure is described. For example... Figure 2 As shown, when the excitation winding 300 of phase A1 of the short magnetic circuit switched reluctance motor of this disclosure is energized, the excitation winding 300 of phase A1 can generate an excitation magnetic field. Since the middle teeth 121 and side teeth 122 of the stator teeth 120 of phase A1 are fully aligned with the three rotor teeth 220, the rotor 200 of the motor does not rotate at this time. A magnetic circuit is formed at the stator teeth 120 and the corresponding three rotor teeth 220, as shown in the diagram. Figure 5 As shown.

[0041] In this exemplary embodiment, such as Figure 5As shown, the magnetic circuit described above can include a double circuit symmetrical with respect to the middle tooth 121 of the stator tooth portion 120. The double circuit can include a first circuit and a second circuit, wherein the first circuit is closed through the middle tooth 121 of the stator tooth portion 120, the rotor tooth portion 220 opposite to the middle tooth 121, the rotor yoke portion 210, the rotor tooth portion 220 opposite to the first side tooth 122a, the first side tooth 122a, and the stator yoke portion 110 connecting the middle tooth 121 and the first side tooth 122a; and the second circuit is closed through the middle tooth 121 of the stator tooth portion 120, the rotor tooth portion 220 opposite to the middle tooth 121, the rotor yoke portion 210, the rotor tooth portion 220 opposite to the second side tooth 122b, the second side tooth 122b, and the stator yoke portion 110 connecting the middle tooth 121 and the second side tooth 122b.

[0042] Further, as Figure 2 shown, the excitation winding 300 of the A1 phase is de-energized and the excitation winding 300 of the B1 phase is energized, the excitation winding 300 of the B1 phase can generate an excitation magnetic field, since the middle tooth 121 and the side tooth 122 of the stator tooth portion 120 of the B1 phase are not completely aligned with the three rotor tooth portions 220, the excitation magnetic field generated by the B1 phase at this time can attract the nearest three rotor tooth portions 220, so that the three rotor tooth portions 220 rotate to positions respectively aligned with the middle tooth 121 and the side tooth 122 of the B1 phase, thereby enabling the rotor 200 to generate a torque and rotate counterclockwise.

[0043] Similarly, de-energizing the excitation winding 300 of the B1 phase and energizing the excitation winding 300 of the C1 phase can further rotate the rotor 200 counterclockwise. Therefore, it can be understood that in the present exemplary embodiment, if the A1 phase, the B1 phase and the C1 phase are sequentially and cyclically energized in the order of A1 phase-B1 phase-C1 phase-A1 phase, the rotor 200 of the short magnetic circuit switched reluctance motor of the present disclosure can be continuously rotated in the counterclockwise direction.

[0044] Similarly, in the short magnetic circuit switched reluctance motor of the present disclosure, a plurality of stator tooth portions 120 can be arranged equidistantly on the inner circumferential surface of the stator yoke portion 110 along the circumferential direction of the stator 100. In one exemplary embodiment, every three stator tooth portions 120 can form a pole phase group, and as Figure 2 shown, the short magnetic circuit switched reluctance motor according to the present exemplary embodiment can have a plurality of pole phase groups (for example, 8 pole phase groups), and the plurality of pole phase groups are arranged equidistantly on the inner circumferential surface of the stator yoke portion 110 at a predetermined angle.

[0045] Specifically, as Figure 2As shown, during the operation of the short magnetic circuit switched reluctance motor disclosed herein, phases A1-A8 can be simultaneously energized and de-energized, phases B1-B8 can be simultaneously energized and de-energized, and phases C1-C8 can be simultaneously energized and de-energized. This increases the motor torque. It can be understood that, depending on the application of the short magnetic circuit switched reluctance motor in different situations, any number of phases can be selectively switched on to change the motor's output torque. For example, switching only phases A1, A3, A5, and A7, phases B1, B3, B5, and B7, and phases C1, C3, C5, and C7 can reduce the motor torque by half compared to using eight phase groups and double it compared to using two phase groups.

[0046] Furthermore, the width of the rotor slot 230 of the short magnetic circuit switched reluctance motor of this disclosure can be equal to the width of the stator slot 123, and the pole arc coefficient of the stator tooth 120 is usually designed to be 0.5, so that the pole arc coefficient of the rotor tooth 220 is also designed to be 0.5 or slightly higher than 0.5. Therefore, the rotor pole arc coefficient of the short magnetic circuit switched reluctance motor of this disclosure is higher than that of the conventional switched reluctance motor.

[0047] For example, such as Figure 2 As shown, each phase of the short magnetic circuit switched reluctance motor according to this exemplary embodiment can have three stator teeth (one intermediate tooth 121 and two side teeth 122), and each pole phase group can have three phases. Therefore, each pole phase group can have a total of 3*3=9 stator teeth, and the rotor portion corresponding to the pole phase group can include 8 rotor teeth 220. Therefore, when the motor has 8 pole phase groups, the stator 100 of the motor can have a total of 9*8=72 stator teeth, and the rotor 200 can have a total of 8*8=64 rotor teeth 220. Therefore, the number of rotor teeth of the short magnetic circuit switched reluctance motor of this disclosure can be higher than that of conventional switched reluctance motors, thereby reducing the step angle of the motor, thereby reducing the torque pulse of the motor, and enabling the motor to have improved low-speed performance.

[0048] It is understood that although the above embodiments exemplarily describe the working principle of a short magnetic circuit switched reluctance motor including 8 pole phase groups, this disclosure is not intended to limit the number of pole phase groups of the short magnetic circuit switched reluctance motor. Those skilled in the art can select any number of pole phase groups as needed, and the angle between adjacent pole phase groups can be obtained by dividing 360° by the number of pole phase groups.

[0049] In addition, it can be understood that although the disclosure exemplarily describes that each pole phase group can include 3 phases (or 3 stator teeth 120), the disclosure is not intended to limit the number of phases or the number of stator teeth contained in each pole phase group, and a person skilled in the art can select any number of phase or the number of stator teeth 120 as needed, and the angle θ between adjacent phases can be calculated according to the formula θ = 360 / m / Zr, wherein m is the number of phases of the short magnetic circuit switched reluctance motor, and Zr is the number of teeth of the rotor 200.

[0050] Further, as shown in FIG. 1, in an exemplary embodiment, the tooth root width of the side tooth 122 of the stator tooth 120 can be equal to half of the tooth root width of the middle tooth 121, and the middle tooth 121 can be a parallel tooth. It can be understood that since the magnetic flux of the middle tooth 121 is twice that of the side tooth 122, designing the tooth root width of the side tooth 122 to be half of the width of the middle tooth 121 can increase the space for placing the excitation winding. Figure 3 In addition, as shown in FIG. 1, in an exemplary embodiment, the cross section of the side tooth 122 of the stator tooth 120 can have an L-shaped shape, and the tooth top width of the side tooth 122 can be equal to the tooth top width of the middle tooth 121. Further, the tooth top width of the rotor tooth 220 can be equal to the tooth top width of the middle tooth 121 or the side tooth 122, and the rotor tooth 220 can be a parallel tooth. It can be understood that such an arrangement can make the tooth top width of the rotor tooth 220, the tooth top width of the middle tooth 121, and the tooth top width of the side tooth 122 all the same.

[0051] Figure 3 Further, as shown in FIG. 1, in an exemplary embodiment, the rotor teeth 220 can be arranged at equal intervals along the circumferential direction of the rotor 200, and the slot top width of the rotor tooth slot 230 can be equal to the slot top width of the stator tooth slot 123. In addition, in an exemplary embodiment, the tooth top spacing between adjacent stator teeth 120 can be less than the slot top width of the rotor tooth slot 230. It can be understood that such an arrangement of the rotor teeth 220 can make the tooth top of the middle tooth 121 and the tooth top of the two side teeth 122 of a stator tooth 120 of a certain phase completely align with the tooth top of the three rotor teeth 220 when the stator tooth 120 is aligned with the three rotor teeth 220, and the stator tooth 120 adjacent to the stator tooth 120 is not aligned with the rotor teeth 220.

[0052] Further, as shown in FIG. 1, in an exemplary embodiment, the rotor teeth 220 can be arranged at equal intervals along the circumferential direction of the rotor 200, and the slot top width of the rotor tooth slot 230 can be equal to the slot top width of the stator tooth slot 123. In addition, in an exemplary embodiment, the tooth top spacing between adjacent stator teeth 120 can be less than the slot top width of the rotor tooth slot 230. It can be understood that such an arrangement of the rotor teeth 220 can make the tooth top of the middle tooth 121 and the tooth top of the two side teeth 122 of a stator tooth 120 of a certain phase completely align with the tooth top of the three rotor teeth 220 when the stator tooth 120 is aligned with the three rotor teeth 220, and the stator tooth 120 adjacent to the stator tooth 120 is not aligned with the rotor teeth 220. Figure 3 In combination with the various exemplary embodiments described above, a person skilled in the art can understand that the disclosure has at least the following two aspects.

[0053]

[0054] ​​In one aspect, each stator tooth of the short magnetic path switched reluctance motor of the present disclosure and the excitation winding arranged on the stator tooth form a phase of the motor, the middle tooth and the edge tooth of each phase form a pair of magnetic poles, so that the magnetic circuit of the phase can be directly closed through the stator tooth and the stator yoke of the phase and the rotor tooth and the rotor yoke opposite to the phase, without crossing the stator yoke of other phases, so that the magnetic circuit of the motor can be shortened, and the iron loss of the motor can be reduced. In addition, each phase of the short magnetic path switched reluctance motor of the present disclosure can be independently designed and self-contained, and each phase including two pairs of magnetic poles can be regarded as a unit, so that the number of units of the motor can be designed according to the number of phases of the motor, and in order to ensure the uniformity of the torque of the motor, each phase can be arranged equidistantly and uniformly in the circumferential direction of the motor.

[0055] In another aspect, the rotor pole arc coefficient of the short magnetic path switched reluctance motor of the present disclosure is higher than that of the conventional switched reluctance motor, so that the rotor tooth number of the short magnetic path switched reluctance motor of the present disclosure is higher than that of the conventional switched reluctance motor, so that the step angle of the motor is reduced, and the torque pulse of the motor is reduced, so that the short magnetic path switched reluctance motor of the present disclosure can have improved low-speed performance.

[0056] In the above description of the present disclosure, unless otherwise explicitly specified and limited, the terms “fixed”, “mounted”, “connected” or “linked” and the like should be understood in a broad sense. For example, as to the term “connected”, it can be fixed connection, or detachable connection, or integral; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through an intermediate medium, or it can be the internal connection of two elements or the interaction relationship between two elements. Therefore, unless otherwise explicitly limited in the present disclosure, the above terms in the present disclosure can be understood by those skilled in the art according to the specific circumstances.

[0057] According to the above description of the present disclosure, those skilled in the art can also understand that the terms used in the present disclosure, 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” and the like indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings of the present disclosure, which are only for the purpose of facilitating the description of the scheme of the present disclosure and simplifying the description, and are not explicitly or implicitly indicated that the devices or elements involved must have a specific orientation, be constructed and operated in a specific orientation, therefore the above orientation or positional relationship terms cannot be understood or interpreted as a limitation on the scheme of the present disclosure.

[0058] In addition, the terms "first" or "second" and the like used in the description of the specification are used for terms indicating numbers or ordinal numbers only for the purpose of description, and cannot be understood as explicitly or implicitly indicating relative importance or implying the number of indicated technical features. Thus, the features defined with "first" or "second" can explicitly or implicitly include at least one of the features. In the description of the specification, the meaning of "plurality" is at least two, for example, two, three or more, etc., unless otherwise explicitly and specifically limited.

[0059] While the present specification has shown and described several embodiments of the present disclosure, it is to be understood that, as these embodiments are provided by way of example only, many changes, modifications and substitutions can be made by one of ordinary skill in the art without departing from the idea and spirit of the present disclosure. It is to be understood that various alternatives to the embodiments of the present disclosure described herein can be employed in practicing the present disclosure. The appended claims are intended to define the scope of the present disclosure and thus cover any and all equivalents or alternatives of the module compositions within the scope of the claims.

Claims

1. A short magnetic circuit switched reluctance motor comprising: a stator including a stator yoke portion and a plurality of stator tooth portions, the stator tooth portions including 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 stator tooth slots between the middle tooth and the side teeth; a rotor coaxially arranged radially inside the stator and having a plurality of rotor tooth portions arranged at equal intervals in a circumferential direction of the rotor to form rotor tooth slots between adjacent rotor tooth portions; a plurality of field windings each of which is arranged in the stator tooth slot around the middle tooth for generating magnetic poles of opposite polarity on the middle tooth and the side teeth, the stator tooth portions having a "mountain” shape, a tooth root width of the side teeth being equal to half of a tooth root width of the middle tooth; and a tooth crest width of the rotor tooth portions being equal to a tooth crest width of the middle tooth, the rotor tooth portions being arranged at equal intervals in a circumferential direction of the rotor, and a slot crest width of the rotor tooth slots being equal to a slot crest width of the stator tooth slots.

2. The short magnetic circuit switched reluctance machine of claim 1, wherein, N poles are generated on the middle tooth and S poles are generated on the side teeth; or S poles are generated on the middle tooth and N poles are generated on the side teeth.

3. The short magnetic circuit switched reluctance machine of claim 1, wherein, A cross section of the side tooth has an L shape.

4. The short magnetic circuit switched reluctance machine of claim 1, wherein, The tooth crest width of the side tooth is equal to the tooth crest width of the middle tooth.

5. The short magnetic circuit switched reluctance machine of claim 1, wherein, The plurality of stator tooth portions are arranged at equal intervals in a circumferential direction of the stator on an inner circumferential surface of the stator yoke portion.

6. The short magnetic circuit switched reluctance machine of claim 1, wherein, A tooth crest interval between adjacent stator tooth portions is less than the slot crest width of the rotor tooth slots.

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