Synchronous motor

Abstract

The present invention relates to the technical field of motors, and provides a synchronous motor, comprising a stator part and a rotor part adapted to the stator part, an air gap space is formed between the stator part and the rotor part, and the air gap space is filled with a fluid magnetic conductor. An air gap space is formed between the stator part and the rotor part, and the air gap space is filled with a fluid magnetic conductor. That is, the air gap space is filled with a fluid magnetic conductor, thereby reducing the magnetic leakage problem between the stator part and the rotor part and increasing its torque density. In this way, under a certain working current, the torque output of the synchronous motor is significantly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular provides a synchronous motor. Background Art

[0002] Synchronous motors are divided into permanent magnet synchronous motors, reluctance synchronous motors and hysteresis synchronous motors. In addition, synchronous motors have been widely used in aerospace, industrial automation, electric vehicles and other fields because of their advantages such as high power, high efficiency and high torque density.

[0003] Then, when the working current of the synchronous motor is limited, the magnetic strength and torque of the motor cannot be further increased. Summary of the invention

[0004] The purpose of the present invention is to provide a synchronous motor, aiming to solve the problem that the performance of the existing synchronous motor cannot be improved when the working current is limited.

[0005] To achieve the above object, the technical solution adopted by the present invention is: a synchronous motor includes a stator part and a rotor part adapted to the stator part, an air gap space is formed between the stator part and the rotor part, and the air gap space is filled with a fluid magnetic conductor.

[0006] In one embodiment, the stator part includes a stator body, the rotor part includes a rotor body and a plurality of permanent magnetic structural components, the outer wall of the rotor body is provided with a plurality of mounting grooves adapted to the outer contour of the permanent magnetic structural components, each of the permanent magnetic structural components is installed in the corresponding mounting groove, and the air gap space is formed between the stator body, the rotor body and the permanent magnetic structural components.

[0007] In one embodiment, the permanent magnetic structure includes two magnetic arms disposed opposite to each other at one end, and the angle between the magnetic arms gradually decreases along the notch direction of the installation slot.

[0008] In one embodiment, the permanent magnetic structure further includes a magnetic base for connecting the two magnetic arms.

[0009] In one embodiment, the permanent magnetic structure includes two magnetic arms which are arranged opposite to each other at one end, and the angle between the magnetic arms gradually increases along the notch direction of the installation slot.

[0010] In one embodiment, a plurality of magnetic blocking members are arranged at intervals in the air gap space, each of the magnetic blocking members divides the air gap space into a plurality of independent air gap sub-spaces, and the fluid magnetic conductor is filled in the air gap sub-spaces.

[0011] In one embodiment, a plurality of magnetically resistive components are arranged at intervals in the air gap space, and each of the magnetically resistive components is arranged at the end of the magnetic arm; at the ends of the two magnetic arms of the same permanent magnetic structural component, the two magnetically resistive components, the stator body and the mover body enclose a first air gap sub-space; at the ends of two adjacent magnetic arms of two adjacent permanent magnetic structural components, the two magnetically resistive components, the stator body and the mover body enclose a second air gap sub-space, and the fluid magnetic conductor is filled in the second air gap sub-space.

[0012] In one embodiment, the stator part includes a stator body, the rotor part includes a rotor body, a plurality of protrusion structures are provided on the outer side of the rotor body, and the air gap space is formed between the stator body, the rotor body and each of the protrusion structures.

[0013] In one embodiment, the rotor body is a non-magnetic rotor body.

[0014] In one embodiment, the air gap space is a cavity formed between two adjacent protrusion structures, and the fluid magnetic conductor is filled in the cavity.

[0015] In one embodiment, the stator part further includes a plurality of windings wound around the stator body.

[0016] Beneficial effects of the present invention: In the synchronous motor provided by the present invention, an air gap space is formed between the stator part and the rotor part, and a fluid magnetic conductor is filled in the air gap space. That is, the air gap space is filled with a fluid magnetic conductor, thereby reducing the magnetic leakage problem between the stator part and the rotor part and increasing its torque density. In this way, under a certain working current, the torque output of the synchronous motor is significantly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 A cross-sectional view of a synchronous motor provided by an embodiment of the present invention;

[0019] Figure 2 A cross-sectional view of a synchronous motor provided by an embodiment of the present invention;

[0020] Figure 3 A cross-sectional view of a synchronous motor provided by an embodiment of the present invention;

[0021] Figure 4 A cross-sectional view of a synchronous motor provided according to an embodiment of the present invention.

[0022] Among them, the reference numerals in the figure are:

[0023] Stator part 10, rotor part 20, air gap space 30, fluid magnetizer 40, stator body 11, rotor body 21, permanent magnet structure 22, mounting groove 21a, first permanent magnet 221, second permanent magnet 222, magnetic blocking part 50, air gap sub-space 31, protrusion structure 23, winding 12. DETAILED DESCRIPTION

[0024] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0025] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0026] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0027] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be 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, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] Usually, there is magnetic resistance in the synchronous motor. Magnetic resistance refers to a parameter in the magnetic circuit containing permanent magnets, which is caused by the leakage of magnetic flux in the magnetic circuit. Among them, when the permanent magnet is used to generate a working magnetic field, three parts are required, namely, permanent magnets, high-permeability soft magnets and air gaps of appropriate size, which are collectively referred to as magnetic circuits. The permanent magnet provides magnetic flux, and a magnetic field is generated at the air gap after being connected by the soft magnet. The total magnetic flux in the magnetic circuit is conserved, but the magnetic flux density at the air gap is relatively reduced because part of the magnetic flux is lost in the non-air gap, which is called leakage flux, resulting in magnetic resistance in the magnetic circuit. At the same time, the torque density of the synchronous motor is limited by the air gap between the stator and the rotor, resulting in the synchronous motor. Under certain working current conditions, the magnetic field strength and torque density of the synchronous motor cannot be further improved. Moreover, affected by processing technology, the air gap between the stator and the rotor cannot be infinitely reduced. In summary, in order to solve the problem that the magnetic field strength and torque density of the above-mentioned synchronous motor cannot be further improved under certain input current conditions, the present application provides the following technical solutions, please refer to the following embodiments for details:

[0029] Please refer to Figure 1 The synchronous motor of the present application includes a stator part 10 and a rotor part 20 adapted to the stator part 10. The rotor part 20 can rotate relative to the stator part 10 around its axis under the action of a magnetic field. In addition, an air gap space 30 is formed between the stator part 10 and the rotor part 20, and the air gap space 30 is used to realize the rotation of the rotor part 20 relative to the stator part 10 around the axis, and a fluid magnetizer 40 is filled in the air gap space 30. Here, the fluid magnetizer 40 is a magnetic material in a fluid state, which can flow in the air gap space 30. For example, the fluid magnetizer 40 is a liquid magnetorheological fluid, which is filled in the air gap space 30 and fills the air gap space 30, thereby improving the magnetic flux between the rotor part 20 and the stator part 10. Alternatively, the fluid magnetizer 40 is a plurality of spherical magnetizer beads, and the diameter of the magnetizer beads is small enough to meet the requirements of flowing in the air gap space 30 and filling the air gap space 30. Similarly, the magnetic beads filled in the air gap space 30 can also meet the requirements of the rotor part 20 rotating around the axis relative to the stator part 10, while improving the flow of magnetic flux between the two and avoiding the attenuation of the magnetic field intensity in the air gap space 30.

[0030] The synchronous motor of the present application is filled with a fluid magnetizer 40 in the air gap space 30 between the stator part 10 and the rotor part 20. The fluid magnetizer 40 is used to fill the air gap space 30, thereby improving the magnetic flux flow in the air gap space 30. In this way, when a certain working current is applied to the synchronous motor, or when the working current is limited, the influence of the air gap space 30 on the magnetic field strength can be reduced, thereby further improving the torque density of the synchronous motor.

[0031] Please refer to Figure 1 and Figure 2In one embodiment, the stator part 10 includes a stator body 11, which forms a magnetic field when powered, for example, three-phase alternating current is supplied to the stator body 11. The rotor part 20 includes a rotor body 21 and a plurality of permanent magnetic structural members 22, the rotor body 21 being a carrier, and the magnetic field formed by each permanent magnetic structural member 22 interacts with the magnetic field formed by the stator body 11 after power is supplied, so that the rotor body 21 rotates around the axis relative to the stator body 11. The rotor body 21 is provided with a plurality of mounting grooves adapted to the outer contour of the permanent magnetic structure 22. Here, the setting position of each mounting groove is described. For example, a plurality of mounting grooves 21a are provided on the side wall of the rotor body 21. Each mounting groove 21a is provided at intervals with the central axis of the rotor body 21 as the rotation center. Specifically, ten mounting grooves 21a are provided on the rotor body 21, and a permanent magnetic structure 22 is provided at each of the ten mounting grooves 21a. Of course, the number of permanent magnetic structures 22 and mounting grooves 21a can also be adjusted according to actual needs. Alternatively, a plurality of mounting grooves 21a are provided in the rotor body 21, and then, when each permanent magnetic structure 22 is installed, it enters the corresponding mounting groove 21a from the end of the rotor body 21. Each permanent magnetic structure 22 is installed in the corresponding installation groove 21a, and the groove structure of the installation groove 21a is adapted to the outer contour of the permanent magnetic structure 22, so as to ensure the installation mechanical strength of each permanent magnetic structure 22, and the magnetic poles of two adjacent permanent magnetic structures 22 are opposite. It can be understood that, for example, the N pole of the permanent magnetic structure 22 in the first position faces outward, and the S pole of the permanent magnetic structure 22 adjacent to it faces outward, so that the overall magnetic circuit is the N pole of a permanent magnetic structure 22, the air gap space 30, the stator body 11, the air gap space 30 and the S pole of another permanent magnetic structure 22.

[0032] Specifically, please refer to the figure, the shape of the permanent magnet structure 22 can be adjusted according to actual needs. For example, the permanent magnet structure 22 includes two first permanent magnets 221 arranged opposite to each other at one end. Similarly, when placed in position, the S pole or N pole of the first permanent magnet 221 is also directed outward. In one case, the angle between the two first permanent magnets 221 gradually decreases along the notch direction of the installation slot 21a, that is, the opening of the permanent magnet structure 22 is in a shrinking state, and the magnetic field concentration effect is better, which can increase the magnetic field strength of the synchronous motor; in another case, the angle between the two first permanent magnets 221 gradually increases along the notch direction of the installation slot 21a, that is, the opening of the permanent magnet structure 22 is in an expanding state, and the magnetic field concentration effect of the expanded permanent magnet structure 22 is relatively reduced, which is suitable for synchronous motors with other pole slot matching and torque density requirements.

[0033] Optionally, refer to Figure 2 and Figure 3, the permanent magnet structure 22 also includes a first permanent magnet 222 for connecting the other ends of the two first permanent magnets 221. The first permanent magnet 222 and the two first permanent magnets 221 enclose a U-shaped permanent magnet structure 22 on the cross section of the rotor body 21. It can be understood that each first permanent magnet 221 and a plurality of first permanent magnets 222 enclose a permanent magnet structure 22 with a U-shaped structure, and the polarity facing outward is consistent, that is, the S pole or the N pole. At the same time, the opening of the U-shaped permanent magnet structure 22 faces the stator body 11, that is, the direction of the magnetic circuit is ensured to face the stator body 11.

[0034] In one embodiment, the permanent magnetic structural member 22 also has a U-shaped structure. The difference from the above embodiment is that the number of first permanent magnets 221 and the number of first permanent magnets 222 of the permanent magnetic structural member 22 are different, that is, at least two or more first permanent magnets 221 are connected in sequence to form a vertical part of the U-shaped structure, and at least two or more first permanent magnets 222 are connected in sequence to form a horizontal part of the U-shaped structure.

[0035] In another embodiment, the permanent magnetic structure 22 includes two first permanent magnets 221 that are abutted at one end and disposed away from each other at the other end, and the angle between the two first permanent magnets 221 gradually increases along the notch direction of the mounting slot 21a. Similarly, the permanent magnetic structure 22 in this case also follows the principle of consistent polarity. It can be understood that the permanent magnetic structure 22 in this embodiment is V-shaped, and its opening direction is toward the stator body 11, that is, it is ensured that the magnetic circuit direction is toward the stator body 11.

[0036] Please refer to Figure 2 and Figure 3In one embodiment, a plurality of magnetic blocking members 50 are arranged at intervals in the air gap space 30. Here, the magnetic blocking member 50 is a non-magnetic metal structure or a structure of other materials. Its function is to prevent the magnetic circuit between two adjacent permanent magnetic structures 22 from being connected, that is, to prevent the formation of a passage that does not pass through the stator between the N pole of the adjacent permanent magnetic structure 22 and the S pole of another permanent magnetic structure 22, thereby reducing unnecessary magnetic leakage to the magnetic flux. At the same time, the setting position of each magnetic blocking member 50 can also be selected, that is, each magnetic blocking member 50 is arranged on the side of the stator body 11 facing the rotor body 21, that is, each magnetic blocking member 50 is stationary relative to the rotor body 21; or, each magnetic blocking member 50 is arranged on the side of the rotor body 21 facing the stator body 11, that is, each magnetic blocking member 50 rotates around the axis together with the rotor body 21. At the same time, due to the addition of the magnetic blocking member 50, the air gap space 30 is divided into a plurality of independent air gap subspaces 31. It can be understood that each air gap subspace 31 is also separated by each magnetic blocking member 50 and is independently arranged, and the fluid magnetizer 40 is filled in the corresponding air gap subspace 31. Here, the air gap subspace 31 may completely correspond to or partially correspond to the opening of the permanent magnetic structure 22, that is, the fluid magnetizer 40 of the air gap subspace 31 has the following situations: First, the fluid magnetizer 40 of the air gap subspace 31 completely corresponds to the opening of the permanent magnetic structure 22. At this time, the magnetic blocking effect of the magnetic blocking member 50 is the best, and the magnetic conductivity effect of the fluid magnetizer 40 is also the best, and the magnetic circuit of the two adjacent permanent magnetic structures 22 has no magnetic leakage problem. Second, the fluid magnetizer 40 of the air gap subspace 31 corresponds to the opening of the permanent magnetic structure 22. At this time, the air gap subspace 31 is staggered with the opening of the permanent magnetic structure 22, so that part of the fluid magnetizer 40 is also outside the opening of the permanent magnetic structure 22. In this way, the magnetic flux can be satisfied, but the effect is relatively poor. Third, the air gap subspace 31 is larger than the opening of the permanent magnetic structure 22 and also completely corresponds. At this time, the magnetic blocking effect of the magnetic blocking component 50 and the magnetic conductive effect of the fluid magnetizer 40 are both better.

[0037] Specifically, please refer to Figure 2 In one embodiment, each magnetic blocking member 50 is located between the first permanent magnets 221 of two adjacent permanent magnetic structural members 22. It can be understood that at this time, the air gap subspace 31 separated by each magnetic blocking member 50 is larger than the opening of the permanent magnetic structural member 22, and at the same time, it completely corresponds to its opening. In each air gap subspace 31 formed in this case, the fluid magnetizer 40 can fill all the air gap subspaces 31, or the fluid magnetizer 40 can be selectively filled in the corresponding air gap subspace 31. For example, the fluid magnetizer 40 is filled into the corresponding corresponding air gap subspace 31 at intervals. Of course, the number of magnetic blocking members 50 between the first permanent magnets 221 of two permanent magnetic structural members 22 is not limited, and one or more can be set.

[0038] Specifically, please refer to Figure 3 In another embodiment, each magnetic blocking member 50 is located at the end of one of the first permanent magnets 221 of the permanent magnetic structure 22. It can be understood that the magnetic blocking member 50 is located at the end of one of the first permanent magnets 221 of the current permanent magnetic structure 22 facing the stator body 11. In this way, the air gap sub-space 31 formed is larger than the opening formed by the two first permanent magnets 221 of the permanent magnetic structure 22. Similarly, filling the corresponding air gap sub-space 31 with a fluid magnetic conductor 40 can also achieve the purpose of magnetic conduction. Alternatively, each magnetic resistance component 50 is located at the end of the two first permanent magnets 221 of the permanent magnetic structure 22. It can be understood that the two magnetic resistance components 50 are respectively arranged at the ends of the two first permanent magnets 221 of the current permanent magnetic structure facing the stator body 11. In this way, the formed air gap subspaces 31 are completely compatible with the openings formed by the two first permanent magnets 221 of the permanent magnetic structure 22. At this time, the fluid magnetic conductor 40 is filled in the air gap subspace 31, and there is no leakage magnetic flux in the magnetic circuit or the leakage magnetic flux is reduced. Moreover, in the present embodiment, each air gap subspace 31 is divided into a first air gap subspace and a second air gap subspace, wherein the first air gap subspace corresponds to the opening of the permanent magnetic structural member 22, and the second air gap subspace is located in the gap between two adjacent permanent magnetic structural members 22. In this way, the fluid magnetizer 40 can also be filled in the following ways: filling in all the first air gap subspaces; or filling in part of the first air gap subspaces; or filling in all the first air gap subspaces and all the second air gap subspaces; or filling in all the first air gap subspaces and part of the second air gap subspaces; or filling in part of the first air gap subspaces and all the second air gap subspaces; or filling in part of the first air gap subspaces and part of the second air gap subspaces.

[0039] Please refer to Figure 4 In another embodiment, the stator part 10 includes a stator body 11, and the rotor part 20 includes a rotor body 21 and a plurality of protrusion structures 23 arranged on the outer side of the rotor body 21. Optionally, each protrusion structure 23 is arranged on the outer side of the rotor body 21 at equal intervals with the rotor body 21 as the central axis and the rotation center. An air gap space 30 is formed between the stator body 11, the rotor body 21 and each protrusion structure 23. In this embodiment, the synchronous motor is a synchronous reluctance motor, which is different from a synchronous permanent magnet motor in that the torque of the synchronous reluctance motor needs to rely on the protrusion structure of the rotor part 20, that is, the rotor body 21 of the rotor part 20 is a non-magnetic rotor body 21, for example, made of non-magnetic metal or non-metallic material. At the same time, a fluid magnetizer 40 is filled in the air gap space 30 , and the magnetic field formed by the fluid magnetizer 40 interacts with the magnetic field of the stator part 10 after power is supplied, and the resulting force pushes one or several of the protruding structures 23 , thereby causing the entire rotor part 20 to rotate around the axis relative to the stator part 10 .

[0040] Specifically, please refer to Figure 4 The air gap space 30 is a concave cavity formed between two adjacent protrusion structures 23, and the fluid magnetic conductor 40 is filled in the concave cavity. It can be understood that the concave cavity is a groove extending in the axial direction of the rotor body 21 and connecting the two ends of the rotor body 21, or the concave cavity is a closed groove extending in the axial direction of the rotor body 21.

[0041] Specifically, please refer to Figure 1 and Figure 4 The stator part 10 further includes a plurality of windings 12 wound on the stator body 11. It can be understood that each winding 12 is electrically connected to an external power source, and when powered on, the winding 12 forms a magnetic field to interact with the rotor part 20.

[0042] In one embodiment, the synchronous motor of the present application is an inner rotor motor, such as Figure 1 As shown, the stator part 10 is sleeved on the outside of the rotor part 20. Of course, the synchronous motor of the present application can also be an outer rotor motor, that is, the rotor part 20 is sleeved on the outside of the stator part 20.

[0043] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A synchronous motor, characterized in that: It comprises a stator part and a rotor part matched with the stator part, an air gap space is formed between the stator part and the rotor part, and the air gap space is filled with a fluid magnetic conductor; The rotor part includes a rotor body and a plurality of permanent magnetic structural parts, wherein the permanent magnetic structural parts include two first permanent magnets arranged at one end facing each other; A plurality of magnetic blocking members are arranged at intervals in the air gap space, each of the magnetic blocking members divides the air gap space into a plurality of independent air gap subspaces, and the air gap subspace is divided into a first air gap subspace and a second air gap subspace, the first air gap subspace corresponds to the opening of the permanent magnetic structural member, and the second air gap subspace is located in the gap between two adjacent permanent magnetic structural members; Wherein, the fluid magnetizer is filled in all of the first air gap subspaces; or, the fluid magnetizer is filled in part of the first air gap subspaces; or, the fluid magnetizer is filled in all of the first air gap subspaces and all of the second air gap subspaces; or, the fluid magnetizer is filled in all of the first air gap subspaces and part of the second air gap subspaces; or, the fluid magnetizer is filled in part of the first air gap subspaces and all of the second air gap subspaces; or, the fluid magnetizer is filled in part of the first air gap subspaces and part of the second air gap subspaces.

2. The synchronous motor according to claim 1, characterized in that: The stator part includes a stator body, and the rotor body is provided with a plurality of mounting grooves adapted to the outer contour of the permanent magnetic structure. Each of the permanent magnetic structures is installed in the corresponding mounting groove, and the magnetic poles of two adjacent permanent magnetic structures are opposite.

3. The synchronous motor according to claim 2, characterized in that: The angle between the two first permanent magnets gradually decreases along the notch direction of the installation slot, or the angle between the two first permanent magnets gradually increases along the notch direction of the installation slot.

4. The synchronous motor according to claim 3, characterized in that: The permanent magnet structure also includes a second permanent magnet for connecting the other ends of the two first permanent magnets. The second permanent magnet and the two first permanent magnets are combined to form a U-shaped permanent magnet structure on the cross section of the rotor body.

5. The synchronous motor according to claim 2, characterized in that: The permanent magnet structure comprises two first permanent magnets which are arranged with one end abutting against each other and with the other end facing away from each other, and the angle between the two first permanent magnets gradually increases along the notch direction of the installation slot.

6. The synchronous motor according to any one of claims 3 to 5, characterized in that: Each of the magnetic blocking components is arranged on a side of the stator body facing the rotor body; or each of the magnetic blocking components is arranged on a side of the rotor body facing the stator body.

7. The synchronous motor according to claim 6, characterized in that: Each of the magnetic blocking components is located between the first permanent magnets of two adjacent permanent magnetic structural components.

8. The synchronous motor according to claim 6, characterized in that: Each of the magnetic blocking components is located at the end of one of the first permanent magnets of the permanent magnetic structure; or each of the magnetic blocking components is located at the ends of two of the first permanent magnets of the permanent magnetic structure.

9. The synchronous motor according to claim 1, characterized in that: The stator part includes a stator body, the rotor part includes a rotor body and a plurality of protrusion structures arranged outside the rotor body, and the air gap space is formed between the stator body, the rotor body and the protrusion structures.

10. The synchronous motor according to claim 9, characterized in that The rotor body is a non-magnetic rotor body.

11. The synchronous motor according to claim 9, characterized in that: The air gap space is a concave cavity formed between two adjacent protrusion structures, and the fluid magnetic conductor is filled in the concave cavity.

12. The synchronous motor according to claim 2 or 9, characterized in that: The stator part further includes a plurality of windings wound around the stator body.

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