CN215835215U

CN215835215U - Disk type split tooth permanent magnetic field modulation motor

Info

Publication number: CN215835215U
Application number: CN202121823024.9U
Authority: CN
Inventors: 林启芳; 蔡锋宾; 刘伟; 吴倩楠
Original assignee: Xiamen Tungsten Co Ltd
Current assignee: Xiamen Tungsten Co Ltd
Priority date: 2021-08-05
Filing date: 2021-08-05
Publication date: 2022-02-15
Anticipated expiration: 2031-08-05

Abstract

The utility model relates to the technical field of motors, and provides a disc type split-tooth permanent magnet magnetic field modulation motor which comprises a stator, a first rotor and an armature winding. The stator comprises a plurality of stator teeth and a stator yoke, the stator teeth are connected to the stator yoke, and a stator slot is formed between every two adjacent stator teeth. The first rotor is coupled to a first side of the stator and forms a first air gap with the stator. First rotor includes a plurality of first rotor tooth and a plurality of first magnet steel, and first magnet steel distributes between first rotor tooth. M second magnetic steels are embedded in the surface, close to the first side, of each stator tooth, and m is a positive integer. The armature windings are disposed in the stator slots. By means of the magnetic steel, magnetic field modulation can be carried out under the condition of a single-layer air gap, and the limit relation between the number of stator slots and the number of rotor pole pairs is decoupled by utilizing the magnetic modulation principle, so that the electrode can still provide larger torque under the condition of low rotating speed.

Description

Disk type split tooth permanent magnetic field modulation motor

Technical Field

The utility model relates to the technical field of motors, in particular to a disk type split tooth permanent magnet magnetic field modulation motor.

Background

The low-speed large-torque transmission system has wide application prospect in the fields of industrial production, oil field exploitation, wind power generation, port hoisting, ship propulsion and the like. At present, a driving system composed of a traditional high-speed motor and a gear reducer has a large system volume in a low-rotating-speed situation, and a mechanical gear transmission system has the problems of high noise, low efficiency, mechanical abrasion and the like, and does not meet the requirements of economic development, energy conservation and environmental protection.

If a traditional magnetic field modulation motor, such as a magnetic gear compound motor, is used, certain defects also exist. Chinese patent (publication No. CN108011484A) discloses a magnetic gear composite motor, in which air gaps are provided between an outer stator and a modulation rotor, and between the modulation rotor and an inner rotor, that is, an inner and an outer air gaps are provided, and a magnetic modulation ring is matched to modulate a magnetic field.

Therefore, the present invention is directed to a disk split-tooth permanent magnet field modulation motor to solve the above problems.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem of more air gaps in the prior art, the utility model provides a disc type split tooth permanent magnet field modulation motor, which can perform field modulation under the condition of a single-layer air gap by means of the arrangement of magnetic steel, and can decouple the limit relationship between the number of stator slots and the number of rotor pole pairs by utilizing the magnetic modulation principle, so that a larger torque can still be provided by an electrode under the condition of low rotating speed, a magnetic modulation ring in the traditional magnetic gear composite motor is omitted, and the structure is simplified.

The utility model provides a disc-type split-tooth permanent magnet field modulation motor which comprises a stator, a first rotor and an armature winding.

The stator comprises a plurality of stator teeth and a stator yoke, the stator teeth are connected to the stator yoke, and a stator slot is formed between every two adjacent stator teeth. The first rotor is coupled in the first side of stator to and form first air gap between the stator, first rotor includes a plurality of first rotor tooth and a plurality of first magnet steel, and a plurality of first magnet steel distributes between a plurality of first rotor tooth. M second magnetic steels are embedded in the surface, close to the first side, of each stator tooth, and m is a positive integer. And the armature winding is arranged in the stator slot.

In one embodiment, the first magnetic steel and the second magnetic steel have the same polarity.

In one embodiment, the armature winding is a toroid winding.

In an embodiment, the disc split-tooth permanent magnet field modulation motor further includes a second rotor, the second rotor is coupled to the second side of the stator, and forms a second air gap with the stator, the second rotor includes a plurality of second rotor teeth and a plurality of fourth magnetic steels, the plurality of fourth magnetic steels are distributed among the plurality of second rotor teeth, n third magnetic steels are embedded in the surface of each stator tooth close to the second side, and n is a positive integer.

In one embodiment, the third magnetic steel and the fourth magnetic steel have the same polarity.

In one embodiment, the number of the first magnetic steels is the same as that of the first rotor teeth, and one first magnetic steel is arranged between two adjacent first rotor teeth.

In an embodiment, the m second magnetic steels on each stator tooth separate the stator tooth into m +1 first stator sub-teeth, the second magnetic steels, the first stator sub-teeth and the stator slot form a first type of magnetic tuning ring structure on the first side of the stator, and a pole pair number Pm of the first type of magnetic tuning ring structure satisfies the following relationship: pm ═ Ns (m +1), where Ns is the number of said stator slots.

In one embodiment, the number of pole pairs Pr of the first rotor of the disc split-tooth permanent magnet field modulation motor and the number of pole pairs Pa of the armature winding satisfy the following relationship: ns (m +1) ═ Pr + Pa.

In an embodiment, the n third magnetic steels on each stator tooth separate the stator tooth into n +1 second stator sub-teeth, and the third magnetic steels, the second stator sub-teeth and the stator slots form a second type of flux modulating ring structure on the second side of the stator, and the number of pole pairs Pn of the second type of flux modulating ring structure satisfies the following relationship: pn (n +1), where Ns is the number of stator slots.

In an embodiment, the number of the fourth magnetic steels is the same as the number of the second rotor teeth, and one fourth magnetic steel is arranged between two adjacent second rotor teeth.

In one embodiment, the first and second rotors may take the shape of a disk.

In an embodiment, the first magnetic steel and the fourth magnetic steel may be Halbach magnetic steel structures.

Based on the above, compared with the prior art, the disk split-tooth permanent magnet field modulation motor provided by the utility model has the advantages that by means of the arrangement of the magnetic steels, the quasi-magnetic ring structures with the magnetic modulation function are formed on the two sides of the stator, the magnetic field modulation can be carried out under the condition of a single-layer air gap, the magnetic modulation ring in the traditional motor is omitted, and the structure is simplified; and the limit relation between the number of stator slots and the number of rotor pole pairs is decoupled by utilizing the magnetic regulation principle, so that the electrode can still provide larger torque under the condition of low rotating speed. And a mechanical gear in the traditional system is omitted, so that the problems of mechanical abrasion, maintenance, noise and the like caused by the mechanical gear are avoided, and the reliability of the system is improved.

In addition, the disk-shaped first rotor and the disk-shaped second rotor can provide larger heat dissipation area, and the problem that the temperature of the rotor part is increased due to the fact that the loss and the heat productivity of the unit volume are increased due to the design of high energy density of the motor is avoided, so that the temperature of the rotor part is increased, and the risk that the performance of rotor magnetic steel is reduced or even demagnetized is caused is avoided.

Moreover, the first magnetic steel on the first rotor side and the second magnetic steel on the stator side generate a bidirectional magnetic field modulation effect, and both the two-way magnetic field modulation effect and the two-way magnetic field modulation effect can contribute to the final output torque, so that the torque density of the motor is further improved. Similarly, the fourth magnetic steel on the second rotor side and the third magnetic steel on the stator side are also the same.

The mirror symmetry motor structure can offset the unilateral magnetic pull of stator and both sides rotor to a great extent, also can further improve the torque density of motor simultaneously. The end of the armature winding is shorter no matter in the case of distributed winding or centralized winding, so that the use amount of copper wires can be greatly reduced, the copper consumption is reduced, and the efficiency is improved.

Additional features and advantages of the utility model will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model. The objectives and other advantages of the utility model will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts; in the following description, the drawings are illustrated in a schematic view, and the drawings are not intended to limit the present invention.

FIG. 1 is a schematic perspective view of a disk split tooth permanent magnet field modulated motor of the present invention;

FIG. 2 is an exploded view of a disk split tooth permanent magnet field modulated motor of the present invention;

FIG. 3 is a schematic structural view of the stator of the present invention;

FIG. 4 is a schematic view of the construction of a first rotor of the present invention;

FIG. 5 is a schematic diagram of the structure of a single toroidal winding of the present invention;

FIG. 6 is a schematic diagram of the excitation direction of each magnetic steel of the present invention;

figure 7 is a schematic diagram of an embodiment of the Halbach structure of the present invention.

Reference numerals:

10-disk split-tooth permanent magnet magnetic field modulation motor 12 stator

123 stator teeth 124 stator yoke 126 stator slots

14 first rotor 142 first rotor teeth 16 second rotor

162 second rotor tooth 18 first air gap 20 second air gap

22 armature winding 41 first magnetic steel 42 second magnetic steel

43 third magnet 44 fourth magnet 1231 first stator teeth

1232 second stator teeth division

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments; the technical features designed in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other; all other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "lateral", "up", "down", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations and positional relationships based on those shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or component in question must have a particular orientation or be constructed and operated in a particular orientation, and therefore, should not be taken as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified. In addition, the term "comprises" and any variations thereof mean "including at least".

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integrally formed connection; can be mechanically or electrically connected; the two components can be directly connected or indirectly connected through an intermediate medium, and the two components can be communicated with each other. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used herein, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.

Referring to fig. 1 to 4, fig. 1 is a schematic perspective view of a disk split-tooth permanent magnet field modulation motor according to the present invention, fig. 2 is an exploded schematic view of the disk split-tooth permanent magnet field modulation motor according to the present invention, fig. 3 is a schematic structural view of a stator 12 according to the present invention, and fig. 4 is a schematic structural view of a first rotor 14 according to the present invention. To achieve at least one of the above advantages or other advantages, an embodiment of the present invention provides a disk split tooth permanent magnet field modulation motor. As shown in the figure, the disc split tooth permanent magnet field modulated motor includes a stator 12, a first rotor 14, and an armature winding 22. Further, the stator 12 includes a plurality of stator teeth 123 and a stator yoke 124, and has a first side and a second side opposite to each other, i.e., a lower side and an upper side in the drawing.

The plurality of stator teeth 123 are connected to the stator yoke 124 and protrude from the upper and lower surfaces of the stator yoke 124. A stator slot 126 is formed between two adjacent stator teeth 123. The first rotor 14 is coupled to a first side of the stator 12 and forms a first air gap 18 with the stator 12. The armature windings 22 are disposed in the stator slots 126. The armature winding 22 can generate electromagnetic torque and induced electromotive force, and is a key component for energy conversion of the disk split tooth permanent magnet magnetic field modulation motor.

When current flows through the armature winding 22, an armature magnetomotive force is generated, which interacts with the magnetic field of the first air gap 18 to generate an electromagnetic torque, which interacts with the rotor speed to absorb or discharge mechanical power.

The first rotor 14 includes a plurality of first rotor teeth 142 and a plurality of first magnetic steels 41, and the plurality of first magnetic steels 41 are distributed between the plurality of first rotor teeth 142. M second magnetic steels 42 are embedded in the surface of each stator tooth 123 close to the lower side of the stator 12, and m is a positive integer.

Further, the disc split-tooth permanent magnet field modulation motor of the present application decouples the limiting relationship between the number of stator slots 126 and the number of rotor pole pairs by using the magnetic modulation principle. Specifically, the stator teeth 123 on the lower side of the stator 12 and the second magnetic steel 42 may form a magnetic modulation structure of a disk split-tooth permanent magnet magnetic field modulation motor, so as to modulate the magnetic field generated by the first rotor 14 side; meanwhile, the magnetic field generated by the stator 12 side is modulated by the magnetic modulating structure formed by the first rotor teeth 142 on the first rotor 14 side and the first magnetic steel 41, so that the bidirectional magnetic modulating effect is achieved, and the magnetic field density of the first air gap 18 can be greatly increased. In addition, the magnetic regulation function can decouple the limit relation between the number of the stator slots 126 and the number of the rotor pole pairs, so that the disc split-tooth permanent magnet magnetic field modulation motor can still generate stable torque under the condition of low number of the stator slots 126 and multiple rotor pole pairs. Furthermore, the magnetic field change rate of the disc split tooth permanent magnet magnetic field modulation motor can be larger than that of a traditional low-speed motor, so that a larger torque can be generated under the condition of low speed.

The torque density refers to the ratio of the maximum output torque of the motor to the volume of the motor. The magnetic field modulation means that the spatial frequency spectrum, the phase or the harmonic component of the original magnetic field is changed, and then some new output characteristics are generated.

In one embodiment, as shown in fig. 1 and 2, the disc split tooth permanent magnet field modulated motor further comprises a second rotor 16. The second rotor 16 is coupled to a second side of the stator 12 and forms a second air gap 20 with the stator 12. Second rotor 16 includes a plurality of second rotor teeth 162 and a plurality of fourth magnetic steel 44, and the plurality of fourth magnetic steel 44 are distributed between the plurality of second rotor teeth 162. N third magnetic steels 43 are embedded in the surface of each stator tooth 123 close to the upper side of the stator 12, and n is a positive integer.

Further, the stator teeth 123 on the upper side of the stator 12 and the third magnetic steel 43 may form a magnetic modulation structure of the disk split-tooth permanent magnet field modulation motor, so as to modulate the magnetic field generated by the second rotor 16 side; meanwhile, the magnetic field generated by the stator 12 side is modulated by the magnetic modulating structure formed by the second rotor teeth 162 on the second rotor 16 side and the fourth magnetic steel 44, so that the bidirectional magnetic modulating effect is achieved, and the magnetic field density of the second air gap 20 can be greatly increased. In addition, the magnetic regulation function can decouple the limit relation between the number of the stator slots 126 and the number of the rotor pole pairs, so that the disc split-tooth permanent magnet magnetic field modulation motor can still generate stable torque under the condition of low number of the stator slots 126 and multiple rotor pole pairs. Furthermore, the magnetic field change rate of the disc split tooth permanent magnet magnetic field modulation motor can be larger than that of a traditional low-speed motor, so that a larger torque can be generated under the condition of low speed.

In an embodiment, as shown in fig. 1 and fig. 2, the first rotor 14 and the second rotor 16 may have a disc shape to provide a larger heat dissipation area, so as to avoid the risk that the temperature of the rotor portion is increased due to the increase of the loss and heat generation amount per unit volume caused by the high energy density design of the disc split-tooth pmm, which leads to the reduction of the performance of the magnetic steel on the rotor and even the demagnetization.

In one embodiment, as shown in fig. 2 and 3, m second magnetic steels 42 on each stator tooth 123 divide the stator tooth 123 into m +1 first stator sub-teeth 1231. The second magnetic steel 42, the first stator sub-teeth 1231 and the stator slots 126 form a first type of magnetic modulating ring structure on the first side of the stator 12, and the pole pair number Pm of the first type of magnetic modulating ring structure satisfies the following relationship: pm ═ Ns (m +1), where Ns is the number of stator slots 126. Taking the example shown in the figure, 1 second magnetic steel 42 on each stator tooth 123 divides the stator tooth 123 into 2 first stator sub-teeth 1231 on the left and right. The number of the stator slots 126 is 24, and the number of pole pairs Pm of the first type of magnetic tuning ring structure is 12 × 2 — 24. Further, since the magnetic permeability of the magnetic steel is close to that of the air in the stator slot 126, and both are much smaller than the stator teeth 123, the "second magnetic steel 42-the first stator sub-tooth 1231-the stator slot 126 air-the first stator sub-tooth 1231" is two pairs of poles counted as the first type of magnetic tuning ring structure, viewed along the circumferential direction of the stator 12. In addition, if each stator tooth 123 is provided with 2 second magnetic steels 42, the stator tooth 123 is divided into 3 first stator sub-teeth 1231 on the left, middle and right, and the three pairs of poles, i.e., the second magnetic steel 42-the first stator sub-teeth 1231-the stator slots 126 air-the first stator sub-teeth 1231 ", are calculated as a first-type magnetic modulating ring structure, and so on.

Similarly, in one embodiment, n third magnetic steels 43 on each stator tooth 123 divide the stator tooth 123 into n +1 second stator sub-teeth 1232. The third magnetic steel 43, the second stator teeth 1232 and the stator slots 126 form a second magnetic field modulating ring structure on the second side of the stator 12, and the pole pair number Pn of the second magnetic field modulating ring structure satisfies the following relationship: pn (n +1), where Ns is the number of stator slots 126. Taking the example shown in the figure, 1 third magnetic steel 43 on each stator tooth 123 divides the stator tooth 123 into 2 second stator sub-teeth 1232 on the left and right. The number of the stator slots 126 is 12, and the number of pole pairs Pn of the second type of magnetic tuning ring structure is 12 × 2 — 24. Further, since the magnetic permeability of the magnetic steel is close to that of the air in the stator slot 126, and both are much smaller than the stator teeth 123, the "third magnetic steel 43-the second stator tooth 1232-the stator slot 126 air-the second stator tooth 1232" is two pairs of poles counted as the second type of magnetic modulating ring structure, viewed in the circumferential direction of the stator 12. In addition, if each stator tooth 123 is provided with 2 third magnetic steels 43, the stator tooth 123 is divided into 3 second stator sub-teeth 1232 on the left, the middle and the right, and so on.

In one embodiment, as shown in fig. 2 and 4, the number of the first magnetic steels 41 is the same as that of the first rotor teeth 142, and two adjacent first rotor teeth 142 are separated by one first magnetic steel 41. In other words, the first magnetic steel 41 and the first rotor tooth 142 are arranged in the order of the first magnetic steel 41-the first rotor tooth 142-the first magnetic steel 41-the first rotor tooth 142 along the circumferential direction of the first rotor 14, and so on. Similarly, in an embodiment, the number of fourth magnetic steels 44 is the same as the number of second rotor teeth 162, and a fourth magnetic steel 44 is spaced between two adjacent second rotor teeth 162. In other words, fourth magnetic steel 44 and second rotor tooth 162 are arranged in order of fourth magnetic steel 44-second rotor tooth 162-fourth magnetic steel 44-second rotor tooth 162 along the circumferential direction of second rotor 16, and so on.

In one embodiment, the stator 12, the first rotor 14, and the second rotor 16 are coaxially disposed. The upper and lower structures of the stator 12 are symmetrically arranged, that is, the upper half part of the stator 12 and the second rotor 16 are mirror images of the lower half part of the stator 12 and the first rotor 14. That is to say, the disk-type split-tooth permanent magnet field modulation motor is of a mirror symmetry structure, so that unilateral magnetic pulling forces of the stator 12 and the rotors on two sides can be counteracted to a greater degree, and meanwhile, the torque density of the motor can be further improved. In one embodiment, the magnetic lines of force of the magnetic steel on the upper and lower surfaces of the stator teeth 123 pass through the stator yoke 124.

Referring to fig. 5, fig. 5 is a schematic structural diagram of a single toroidal winding according to the present invention. As shown, the armature winding 22 may employ a ring winding. The toroidal windings are embedded longitudinally in stator slots 126, wound around stator yoke 124. Because the magnetic lines of force of the magnetic steel on the upper and lower sides of the stator teeth 123 all pass through the stator yoke 124, the ring winding can save more copper wires compared with the case that the armature winding 22 is wound on the stator teeth 123. Further, the use of the ring winding also enables the height of the upper and lower ends of the armature winding 22 to be shortened, and can be realized regardless of the distributed winding or the concentrated winding. In particular, the armature winding 22 structure is matched with the middle stator 12, the first rotor 14 and the second rotor 16, so that the efficiency of the disc split tooth permanent magnet field modulation motor can be further improved. However, the present invention is not limited thereto. The armature winding 22 may be formed of other common types of windings such as upper and lower windings.

Further, the single rotor pole pair Pr and the armature winding 22 pole pair Pa of the disk split tooth permanent magnet field modulation motor satisfy the following relation that Ns (n +1) ═ Pr + Pa. Taking the first rotor 14 as an example, an adjacent first rotor tooth 142 and a first magnetic steel 41 on the first rotor 14 are in a pair of poles. The number Pr of pole pairs of the first rotor 14 is 19, the number Ns of the stator slots 126 is 12, and n is 1, the number Pr of pole pairs of the first rotor 14 and the number Pa of pole pairs of the armature winding 22 satisfy: 12 x 2 ═ 19+ 5.

In one embodiment, the first rotor 14 and the second rotor 16 may be offset by a predetermined angle, which may be a distance of 1/3 stator teeth 123 to 2/3 stator teeth 123, and preferably may be offset by a half stator tooth 123, so as to offset the unbalanced force and the cogging torque of the disk split-tooth pmm part and reduce the torque ripple of the disk split-tooth pmm.

Referring to fig. 6, fig. 6 is a schematic view of the polarities of the magnetic steels according to the present invention. Note that the arrow direction in the drawing indicates the excitation direction, and for example, if the upward arrow indicates the N pole, the downward arrow indicates the S pole. As shown in the figure, the polarities of the first magnetic steel 41 and the second magnetic steel 42 are the same, and the polarities of the third magnetic steel 43 and the fourth magnetic steel 44 are the same, so as to improve the efficiency of the disc-type split-tooth permanent magnet field modulation motor.

In one embodiment, as shown in fig. 7, each of the magnetic steels on the first rotor 14 and the second rotor 16 may be a Halbach magnetic steel structure. That is, the first magnetic steel 41 and the fourth magnetic steel 44 may be Halbach magnetic steel structures. Through the arrangement of the Halbach magnetic steel structure, the magnetic leakage of the first rotor 14 and the second rotor 16 can be reduced, the utilization rate of the magnetic steel is improved, and the torque pulsation is improved.

In summary, compared with the prior art, the disc split-tooth permanent magnet field modulation motor provided by the utility model has the advantages that by means of the arrangement of the magnetic steels, the magnetic adjustment-like ring structures with the magnetic adjustment function are formed on the two sides of the stator 12, the magnetic field modulation can be carried out under the condition of a single-layer air gap, the magnetic adjustment ring in the traditional motor is omitted, and the structure is simplified; and the limit relation between the number of stator slots 126 and the number of rotor pole pairs is decoupled by utilizing the magnetic regulation principle, so that the disc type split-tooth permanent magnet magnetic field modulation motor can still provide larger torque under the condition of low rotating speed. And a mechanical gear in the traditional system is omitted, so that the problems of mechanical abrasion, maintenance, noise and the like caused by the mechanical gear are avoided, and the reliability of the system is improved.

In addition, the disk-shaped first rotor 14 and the disk-shaped second rotor 16 can provide a larger heat dissipation area, and the risk that the rotor magnetic steel performance is reduced and even demagnetized due to the fact that the temperature of a rotor part is increased and the temperature of the rotor part is increased due to the fact that the loss and the heat productivity of the unit volume are increased due to the high energy density design of the motor is avoided.

Moreover, the first magnetic steel 41 on the first rotor 14 side and the second magnetic steel 42 on the stator 12 side both generate the bidirectional magnetic field modulation effect, which can contribute to the final output torque, so that the torque density of the motor is further improved. Similarly, the same applies to the fourth magnetic steel 44 on the second rotor 16 side and the third magnetic steel 43 on the stator 12 side.

The mirror symmetry motor structure can offset the unilateral magnetic pull of stator 12 and both sides rotor to a great extent, also can further improve the torque density of motor simultaneously. In the case of the used ring winding, whether distributed winding or centralized winding, the end of the armature winding 22 is short, so that the usage amount of copper wires can be greatly reduced, copper consumption is reduced, and efficiency is improved.

In addition, it will be appreciated by those skilled in the art that, although there may be many problems with the prior art, each embodiment or aspect of the present invention may be improved only in one or several respects, without necessarily simultaneously solving all the technical problems listed in the prior art or in the background. It will be understood by those skilled in the art that nothing in a claim should be taken as a limitation on that claim.

Although terms such as armature winding, stator teeth, rotor teeth, magnetic field modulation, etc. are used more often herein, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed as being without limitation to any additional limitations that may be imposed by the spirit of the present invention.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the utility model has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A disk split tooth permanent magnet field modulation motor, characterized in that, disk split tooth permanent magnet field modulation motor includes:

the stator comprises a plurality of stator teeth and a stator yoke, the plurality of stator teeth are connected to the stator yoke, and a stator slot is formed between every two adjacent stator teeth;

the first rotor is coupled to the first side of the stator, a first air gap is formed between the first rotor and the stator, the first rotor comprises a plurality of first rotor teeth and a plurality of first magnetic steels, and the plurality of first magnetic steels are distributed among the plurality of first rotor teeth;

m second magnetic steels are embedded in the surface, close to the first side, of each stator tooth, and m is a positive integer; and

and the armature winding is arranged in the stator slot.

2. The disc split tooth permanent magnet field modulated motor of claim 1, characterized in that: the armature winding is a ring winding.

3. The disc split tooth permanent magnet field modulated motor of claim 1, characterized in that: the disc-type split-tooth permanent magnetic field modulation motor further comprises a second rotor, the second rotor is coupled to the second side of the stator, a second air gap is formed between the second rotor and the stator, the second rotor comprises a plurality of second rotor teeth and a plurality of fourth magnetic steels, the plurality of fourth magnetic steels are distributed among the plurality of second rotor teeth, n third magnetic steels are embedded in the surface, close to the second side, of each stator tooth, and n is a positive integer.

4. The disc split tooth permanent magnet field modulated motor of claim 3, characterized in that: the first magnetic steel and the second magnetic steel have the same polarity, and the third magnetic steel and the fourth magnetic steel have the same polarity.

5. The disc split tooth permanent magnet field modulated motor of claim 1 or 3, characterized in that: the number of the first magnetic steels is the same as that of the first rotor teeth, and the first magnetic steels are spaced one by one between every two adjacent first rotor teeth.

6. The disc split tooth permanent magnet field modulated motor of claim 1 or 3, characterized in that: the m second magnetic steels on each stator tooth divide the stator tooth into m +1 first stator sub-teeth, the second magnetic steels, the first stator sub-teeth and the stator slot form a first type of magnetic modulating ring structure on the first side of the stator, and the number of pole pairs Pm of the first type of magnetic modulating ring structure satisfies the following relation: pm ═ Ns (m +1), where Ns is the number of said stator slots.

7. The disc split tooth permanent magnet field modulated motor of claim 6, characterized in that: the number Pr of the pole pairs of the first rotor of the disc-type split-tooth permanent magnet magnetic field modulation motor and the number Pa of the pole pairs of the armature windings satisfy the following relation: ns (m +1) ═ Pr + Pa.

8. The disc split tooth permanent magnet field modulated motor of claim 3, characterized in that: the n third magnetic steels on each stator tooth divide the stator tooth into n +1 second stator sub-teeth, the third magnetic steels, the second stator sub-teeth and the stator slots form a second type of magnetic modulating ring structure on the second side of the stator, and the number of pole pairs Pn of the second type of magnetic modulating ring structure satisfies the following relation: pn (n +1), where Ns is the number of stator slots.

9. The disc split tooth permanent magnet field modulated motor of claim 3, characterized in that: the number of the fourth magnetic steels is the same as that of the second rotor teeth, and one fourth magnetic steel is arranged between every two adjacent second rotor teeth.

10. The disc split tooth permanent magnet field modulated motor of claim 3, characterized in that: the first magnetic steel and the fourth magnetic steel can be Halbach magnetic steel structures.