Doubly salient permanent magnet motor

Abstract

The invention relates to the field of motors, and discloses a doubly salient permanent magnet motor, which comprises a rotor part, and the rotor part comprises a rotating shaft, a rotor magnet yoke sleeving the axial surface of the rotating shaft, rotor salient poles uniformly arranged along the outer cylindrical surface in the axial direction of the rotor magnet yoke in a convex manner, and a plurality of rotating shaft salient poles uniformly arranged along the axial surface of the rotating shaft; the Hall sensor is integrated on the stator disc, and the rotating shaft salient poles and the rotating shaft are integrally designed, so that extra space occupation in the motor is ingeniously avoided, the space utilization efficiency of the motor is remarkably improved, and the motor is more compact in structure and more compact in structure. Mechanical loss caused by the fact that the rotor part of the Hall sensor is installed on the rotating shaft is effectively reduced, and the operation efficiency and reliability of the motor are improved. Besides, the position of the rotor can be accurately measured only through the Hall sensor on the disc, powerful support is provided for accurate control of the motor, and the performance of the motor is optimized.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of electric machines, and in particular to a doubly salient permanent magnet electric machine. BACKGROUND

[0002] As a new type of electromechanical energy conversion device, doubly salient electric machines emerged to meet the demand for high-performance electric machines in modern electric drive systems. The concept of doubly salient electric machines can be traced back to the 1950s. Subsequently, in the 1990s, with the continuous improvement of the performance of permanent magnet materials and the rapid development of power electronics technology, permanent magnet doubly salient electric machines have received more research attention. Doubly salient electric machines have structural advantages of small size, high power density, and high reliability, and show good application prospects in the fields of aerospace, etc.

[0003] However, doubly salient permanent magnet electric machines also have some shortcomings. During the rotation of the rotor, the inductance of the stator winding will change dramatically with the change of the rotor position, which leads to a large torque ripple. As a result, the control strategy of doubly salient permanent magnet electric machines is relatively complex, and real-time acquisition of rotor position information is required to achieve precise control. By measuring the rotor position, the change of the torque can be grasped in real time, and then the control strategy can be adjusted. Some scholars have proposed that applying a compensation current at the appropriate rotor position can effectively reduce the torque ripple and improve the running stability of the electric machine. In addition, the rotor position information can also reflect the running state of the electric machine, and by comparing the rotor position data at the current running time of the electric machine with the rotor position data at the normal running time, it can be judged whether the electric machine has a fault.

[0004] The traditional methods for detecting the rotor position mainly include the following: The resolver is installed coaxially with the electric machine, and the rotor part is fixed on the electric machine shaft, and the stator part is fixed on the electric machine shell. Through the electromagnetic coupling between the stator and the rotor, the resolver can output a voltage signal in a sine / cosine relationship with the rotor angle, which is then decoded into a digital angle value by an RDC (resolver digital converter).

[0005] The grating disc of the optical encoder is installed at the end of the rotor shaft, and the optical sensor is fixed on the stator side. When the grating disc rotates with the rotor, the photosensitive element will detect the change of light transmission / shading, thereby generating a pulse signal.

[0006] The Hall element of the Hall sensor is fixed on the stator side, and the rotor part of the Hall sensor is installed coaxially with the electric machine rotor. The Hall element outputs discrete position signals by detecting the change of magnetic field strength.

[0007] But these methods have a common problem, that is, the need to install components on the stator and the shaft. The part installed on the shaft will occupy additional axial or radial space inside the motor, and during the rotation of the shaft of the doubly salient permanent magnet motor, mechanical loss is inevitable. SUMMARY

[0008] Therefore, the technical problem to be solved by the present application is that the conventional method of detecting the position of the rotor requires the installation of components on the stator and the shaft. The part installed on the shaft will occupy additional axial or radial space inside the motor, and during the rotation of the shaft of the doubly salient permanent magnet motor, mechanical loss is inevitable.

[0009] The above technical problem is solved by the following technical solution: The present application provides a doubly salient permanent magnet motor, comprising, a rotor member, the rotor member comprising a shaft, a rotor yoke sleeved on the axial surface of the shaft, a plurality of rotor salient poles uniformly arranged on the outer cylindrical surface of the rotor yoke, and a plurality of shaft salient poles uniformly arranged on the axial surface of the shaft; a stator member, the stator member comprising a stator sleeve, an annular permanent magnet embedded in the inner wall of the stator sleeve, a stator yoke sleeved on the inner wall of the stator sleeve, a plurality of stator salient poles uniformly arranged on the inner cylindrical surface of the stator yoke, and an armature winding uniformly arranged around the surface of each stator salient pole; and a monitoring member, the monitoring member comprising a disc arranged on the inner wall of the stator sleeve, and a Hall sensor fixedly installed on the inner annular surface of the disc; the Hall sensor is installed on the inner annular surface of the disc, so that the internal space of the motor is more compact, and the Hall sensor does not contact the stator part of the motor, so there is no need to worry about interference.

[0010] The number of the shaft salient poles and the stator salient poles is set in accordance with the matching standard of the number of stator poles and the number of rotor poles of the doubly salient motor.

[0011] In a preferred embodiment of the doubly salient permanent magnet motor, the Hall sensor is specifically provided in three groups, and the three groups of Hall sensors are a first Hall sensor, a second Hall sensor and a third Hall sensor. By setting the number of Hall sensors, it is ensured that the three groups of Hall sensors can be effectively matched to accurately determine the position of the motor rotor.

[0012] In a preferred embodiment of the double salient permanent magnet motor, the disc is provided with a central hole along the central axis for the shaft to pass through, and the disc is arranged in the same horizontal plane as the shaft salient pole. When the disc is in the same horizontal plane as the shaft, the smoothness of the overall operation of the device can be ensured, and the Hall sensor and the shaft salient pole are also in the same horizontal plane, so that accurate monitoring can be achieved.

[0013] In a preferred embodiment of the double salient permanent magnet motor, there is a horizontal air gap between the disc and the shaft, and the width of the horizontal air gap is 1.5-2 mm. By limiting the width of the horizontal air gap, the Hall sensor can be installed between the horizontal air gaps without affecting the normal operation of the device, and the horizontal air gap width is not too large to cause excessive magnetic resistance and negative effects such as magnetic flux loss, and the overall space occupied is small.

[0014] The Hall sensor is located in the horizontal air gap between the disc and the shaft, and the size of the Hall sensor is smaller than the horizontal air gap.

[0015] In a preferred embodiment of the double salient permanent magnet motor, the first Hall sensor and the second Hall sensor are separated by an included angle of 60°, and the second Hall sensor and the third Hall sensor are separated by an included angle of 60°.

[0016] In a preferred embodiment of the double salient permanent magnet motor, the center of the Hall sensor is aligned with the edge of the shaft salient pole. When the shaft salient pole sweeps across the Hall sensor, the Hall sensor outputs a high-level signal, and vice versa, the Hall sensor outputs a low-level signal. The motor rotor part rotates one circle with four periods, and each Hall sensor can obtain three position signals in one period to determine the position of the motor rotor.

[0017] In a preferred embodiment of the double salient permanent magnet motor, the shaft salient pole is formed by uniformly opening notches on the surface of the shaft, and the shaft salient pole and the shaft are designed as an integral type. The advantages of integral design are: without the need to add new permanent magnets on the outside of the shaft to realize the position monitoring of the rotor, thereby reducing the space occupied inside the device, avoiding unnecessary wear, and directly utilizing the magnetic field generated by the motor operation to realize the position monitoring of the rotor.

[0018] In a preferred embodiment of the dual-salient-pole permanent magnet motor of the present invention: the number of shaft salient poles is the same as the number of rotor salient poles, and the shaft salient poles and rotor salient poles are arranged in a one-to-one correspondence around the shaft axis. By designing the shaft salient poles and rotor salient poles to correspond, the specific position of the rotor salient poles can be directly deduced by monitoring the position of the shaft salient poles using the Hall sensor.

[0019] In a preferred embodiment of the double salient pole permanent magnet motor of the present invention: the stator sleeve includes an upper sleeve and a lower sleeve, the annular permanent magnet is embedded between the upper sleeve and the lower sleeve, the stator yoke is disposed on the inner wall of the lower sleeve, and the disk is disposed on the inner wall of the upper sleeve.

[0020] In a preferred embodiment of the dual salient pole permanent magnet motor of the present invention: the number of rotor salient poles is set to 4, and the number of stator salient poles is set to 6.

[0021] The beneficial effects of this invention are as follows: By integrating the Hall sensor into the stator disk and adopting an integrated design of the salient pole and the shaft, extra space is cleverly avoided inside the motor, significantly improving the space utilization efficiency of the motor and making the motor structure more compact. The integrated design of the salient pole and the shaft not only improves the space utilization efficiency of the motor but also effectively reduces the mechanical losses caused by the rotor part of the Hall sensor being mounted on the shaft, thus improving the operating efficiency and reliability of the motor. Furthermore, relying solely on the Hall sensor on the disk, the rotor position can be accurately measured, providing strong support for precise motor control and further optimizing the motor's performance. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments of the present invention will be briefly described below. Obviously, the drawings described below only relate to some embodiments of the present invention and are not intended to limit the present invention.

[0023] Figure 1 An overall cross-sectional view of a double salient pole permanent magnet motor according to the present invention is shown.

[0024] Figure 2 The diagram shows an exploded view of the overall structure of a dual-salient pole permanent magnet motor according to the present invention.

[0025] Figure 3 A schematic diagram of the rotor salient pole side structure of a double salient pole permanent magnet motor according to the present invention is shown.

[0026] Figure 4 A schematic diagram of the overall side structure of a double salient pole permanent magnet motor according to the present invention is shown.

[0027] Figure 5 A schematic diagram showing the specific location of the Hall sensor in a dual salient pole permanent magnet motor according to the present invention is shown.

[0028] Figure 6 A schematic diagram illustrating the working principle of a Hall sensor for a dual salient pole permanent magnet motor according to the present invention is shown.

[0029] Figure 7 The diagram shows a schematic diagram of the rotor salient pole first state structure of a double salient pole permanent magnet motor according to the present invention.

[0030] Figure 8 A schematic diagram of the rotor salient pole second state structure of a double salient pole permanent magnet motor according to the present invention is shown.

[0031] Figure 9 The diagram shows a schematic of the rotor salient pole third state structure of a double salient pole permanent magnet motor according to the present invention.

[0032] Figure 10 The diagram shows the rotor salient pole transitions in different states of a dual salient pole permanent magnet motor according to the present invention.

[0033] Figure 11 A schematic diagram of the magnetic flux linkage of a doubly salient permanent magnet motor according to the present invention is shown.

[0034] Figure 12 A schematic diagram of the induced electromotive force of a doubly salient permanent magnet motor according to the present invention is shown.

[0035] Figure 13 A schematic diagram of the Hall sensor output signal of a dual salient pole permanent magnet motor according to the present invention is shown.

[0036] In the diagram: 1. Rotor component; 11. Shaft; 12. Rotor yoke; 13. Rotor salient pole; 14. Shaft salient pole; 2. Stator component; 21. Stator sleeve; 22. Annular permanent magnet; 23. Stator yoke; 24. Stator salient pole; 25. Armature winding; 3. Monitoring component; 31. Disk; 32. Hall sensor; 321. Hall sensor No. 1; 322. Hall sensor No. 2; 323. Hall sensor No. 3; 211. Upper sleeve; 212. Lower sleeve. Detailed Implementation

[0037] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0038] The terminology used in this invention is that which is currently widely used in the art in consideration of the function of the invention; however, these terms may vary according to the intent of those skilled in the art, precedent, or new technology in the art. Furthermore, specific terms may be chosen by the applicant, and in such cases, their detailed meanings will be described in the detailed description of the invention. Therefore, the terms used in this specification should not be construed as simple names, but rather based on their meanings and the overall description of the invention.

[0039] Reference Figures 1-13 This embodiment provides a dual salient pole permanent magnet motor, including, Rotor component 1 includes a rotating shaft 11, a rotor yoke 12 sleeved on the axial surface of the rotating shaft 11, rotor salient poles 13 uniformly arranged on the outer cylindrical surface around the axial direction of the rotor yoke 12, and a plurality of rotating shaft salient poles 14 uniformly arranged on the surface around the axial direction of the rotating shaft 11. Stator component 2, comprising a stator sleeve 21, an annular permanent magnet 22 embedded in the inner wall of the stator sleeve 21, a stator yoke 23 sleeved on the inner wall of the stator sleeve 21, a plurality of stator salient poles 24 uniformly arranged on the inner cylinder surface around the axial direction of the stator yoke 23, and an armature winding 25 uniformly wound around the periphery of each stator salient pole 24; and, The monitoring component 3 includes a disk 31 disposed on the inner wall of the stator sleeve 21, and a Hall sensor 32 fixedly installed on the inner ring surface of the disk 31. Installing the Hall sensor 32 on the inner ring surface of the disk 31 makes the internal space of the motor more compact, and the Hall sensor 32 does not come into contact with the stator part of the motor, so there is no need to worry about interference.

[0040] The number of salient poles 14 on the rotating shaft and salient poles 24 on the stator are set in accordance with the matching standard of stator pole number and rotor pole number of a double salient pole motor.

[0041] As one embodiment provided, such as Figure 5 The Hall sensor 32 is specifically configured into three groups, namely Hall sensor 321, Hall sensor 322, and Hall sensor 323. By setting the number of Hall sensors 32, it is ensured that the three groups of Hall sensors 32 can work together effectively to accurately determine the position of the motor rotor.

[0042] As one embodiment provided, such as Figure 1 , Figure 6The disc 31 has a central hole along its central axis for the rotating shaft 11 to pass through, and the disc 31 and the rotating shaft salient pole 14 are set on the same horizontal plane. When the disc 31 and the rotating shaft 11 are on the same horizontal plane, it can first ensure the smooth operation of the entire device, and at the same time ensure that the Hall sensor 32 and the rotating shaft salient pole 14 are also on the same horizontal plane, thereby enabling accurate monitoring.

[0043] As one embodiment provided, such as Figure 1 There is a horizontal air gap between the disk 31 and the rotating shaft 11, and the width of the horizontal air gap is 1.5mm~2mm. By limiting the width of the horizontal air gap, it can be ensured that the Hall sensor 32 is installed between the horizontal air gaps without affecting the normal operation of the equipment. At the same time, it will not cause excessive magnetic resistance and magnetic flux loss due to excessive horizontal air gap width, and the overall space occupied is small.

[0044] The Hall sensor 32 is located in the horizontal air gap between the disk 31 and the rotating shaft 11, and the size of the Hall sensor 32 is smaller than the horizontal air gap.

[0045] As one embodiment provided, such as Figure 5 There is a 60° angle between Hall sensor 321 and Hall sensor 322, and a 60° angle between Hall sensor 322 and Hall sensor 323.

[0046] As one embodiment provided, such as Figure 5 The center of Hall sensor 32 is aligned with the edge of the salient pole 14 of the rotating shaft. When the salient pole 14 of the rotating shaft sweeps across Hall sensor 32, Hall sensor 32 outputs a high-level signal, and vice versa. The motor rotor rotates with the rotating shaft 11 for one revolution, which has four cycles. Within one cycle, each Hall sensor 32 can obtain three position signals to determine the position of the motor rotor.

[0047] As one embodiment provided, such as Figure 1 , Figure 2 The salient pole 14 of the rotating shaft is formed by uniformly opening slots on the surface of the rotating shaft 11, and the salient pole 14 of the rotating shaft 11 is an integral design. The advantage of the integral design is that there is no need to add a new permanent magnet on the outside of the rotating shaft 11 to realize the rotor position monitoring, thereby reducing the space occupied inside the equipment and avoiding unnecessary wear. At the same time, the rotor position monitoring can be realized directly by using the magnetic field generated by the motor itself.

[0048] As one embodiment provided, such as Figure 5The number of shaft salient poles 14 is the same as the number of rotor salient poles 13, and the shaft salient poles 14 and rotor salient poles 13 are arranged in a one-to-one correspondence around the axis of the shaft 11. By matching the shaft salient poles 14 with the rotor salient poles 13, the specific position of the rotor salient poles 13 can be directly deduced by monitoring the position of the shaft salient poles 14 using the Hall sensor 32.

[0049] As one embodiment provided, such as Figure 1 , Figure 2 The stator sleeve 21 includes an upper sleeve 211 and a lower sleeve 212. An annular permanent magnet 22 is embedded between the upper sleeve 211 and the lower sleeve 212. The stator yoke 23 is disposed on the inner wall of the lower sleeve 212, and the disc 31 is disposed on the inner wall of the upper sleeve 211.

[0050] As one embodiment provided, such as Figures 2-5 The number of rotor salient poles 13 is set to 4, and the number of stator salient poles 24 is set to 6.

[0051] The technical solution of this invention is for a three-phase doubly salient permanent magnet motor with a 6 / 4 pole structure. The stator of the motor has six stator poles evenly distributed circumferentially, each stator pole equipped with a concentrated non-overlapping winding. Two spatially opposite windings are connected in series to form a phase winding. The rotor of the motor has four rotor poles evenly distributed circumferentially, and the rotor poles have no windings. To ensure that the positioning torque generated by the excitation magnetic source is theoretically zero, the magnetic permeability of the excitation magnetic circuit should not be affected by the rotor position. Therefore, the ratio of the stator pole width to the stator pole pitch of the doubly salient permanent magnet motor should satisfy the following formula, while the width of the rotor pole is generally equal to or greater than the width of the stator pole.

[0052] ,

[0053] In the formula, This is the ratio of the stator pole width to the stator pole pitch of a three-phase motor. The stator pole width, This refers to the stator pole pitch.

[0054] Working principle as follows Figure 6 As shown: The annular permanent magnet 22 is axially magnetized to generate an excitation magnetic field. After current is applied to the armature winding 25, an armature magnetic field is generated. The excitation magnetic field and the armature magnetic field interact to generate torque. The closed magnetic circuit starts from the annular permanent magnet 22, passes through the upper sleeve 211, the disk 31, the air gap between the disk 31 and the shaft salient pole 14, the shaft salient pole 14, the shaft 11, the rotor yoke 12, the rotor salient pole 13, the air gap between the rotor salient pole 13 and the stator salient pole 24, the stator salient pole 24, the stator yoke 23, and the lower sleeve 212, and then returns to the annular permanent magnet 22.

[0055] The overall monitoring method for rotor position is as follows:Figures 7-10 As shown, Hall sensor 321, Hall sensor 322, and Hall sensor 323 correspond to phases A, B, and C of the dual salient pole permanent magnet motor, respectively, with each pair of Hall sensors 32 separated by a mechanical angle of 60°. At this point, the rotor is stationary. When the rotor and shaft 11 rotate counterclockwise by 30°, the salient pole 13 of the A-phase rotor changes from being completely aligned to being completely misaligned with the stator salient pole 24. The air gap reluctance gradually increases from its minimum, the flux linkage of the armature winding 25 gradually decreases, and the induced electromotive force becomes negative. Hall sensor 321 outputs a low-level signal. The salient pole 13 of the B-phase rotor remains completely misaligned with the stator salient pole 24, and the flux linkage and induced electromotive force of the armature winding 25 remain zero. Hall sensor 322 outputs a low-level signal. The salient pole 13 of the C-phase rotor remains completely misaligned with the stator salient pole 24. When the stator salient pole 24 changes from a completely misaligned state to a completely aligned state, the magnetic flux of the armature winding 25 gradually increases, the induced electromotive force becomes positive, and Hall sensor 323 outputs a high-level signal. When the rotor and shaft 11 rotate counterclockwise to a mechanical angle of 60°, the A-phase rotor salient pole 13 and stator salient pole 24 remain completely misaligned, the magnetic flux and induced electromotive force of the armature winding 25 remain zero, Hall sensor 321 outputs a low-level signal, and the B-phase rotor salient pole 13 and stator salient pole 24 change from a completely misaligned state to a completely aligned state. As the flux linkage of armature winding 25 gradually increases, the induced electromotive force becomes positive, and Hall sensor 322 outputs a high-level signal. The C-phase rotor salient pole 13 and stator salient pole 24 change from a completely aligned state to a completely misaligned state. The air gap reluctance gradually increases from its minimum, and the flux linkage of armature winding 25 gradually decreases, resulting in a negative induced electromotive force. Hall sensor 323 outputs a low-level signal. When the rotor and shaft 11 rotate counterclockwise to a mechanical angle of 90°, the A-phase rotor salient pole 13 and stator salient pole 24 change from a completely misaligned state to a completely aligned state, and the armature... As the flux linkage of winding 25 gradually increases, the induced electromotive force becomes positive, and Hall sensor 321 outputs a high-level signal. The rotor salient pole 13 and stator salient pole 24 of phase B change from a completely aligned state to a completely misaligned state. The air gap reluctance gradually increases from its minimum, and the flux linkage of armature winding 25 gradually decreases, resulting in a negative induced electromotive force. Hall sensor 322 outputs a low-level signal. The rotor salient pole 13 and stator salient pole 24 of phase C remain completely misaligned, and the flux linkage and induced electromotive force of armature winding 25 remain zero. Hall sensor 323 outputs a low-level signal.

[0056] In summary, the salient pole 14 of the rotating shaft has the same shape as the motor rotor and is also in the same position during rotation. The present invention is equivalent to reflecting the position change of the motor rotor by the position change of the salient pole 14 of the rotating shaft. The center position of the Hall sensor 32 is opposite to the edge of the salient pole 14 of the rotating shaft. When the salient pole 14 of the rotating shaft sweeps past the Hall sensor 32, the Hall sensor 32 outputs a high-level signal, and vice versa. The motor rotor rotates with the rotating shaft 11 for four cycles. Within one cycle, each Hall sensor 32 can obtain three position signals to determine the position of the motor rotor.

[0057] Finally, it should be noted that the methods and devices described in detail above are merely embodiments, and those skilled in the art can modify these embodiments in different ways as long as they do not depart from the scope of the present invention.

Claims

1. A double salient pole permanent magnet motor, characterized in that: include, The rotor component (1) includes a rotating shaft (11), a rotor yoke (12) sleeved on the axial surface of the rotating shaft (11), a rotor salient pole (13) uniformly arranged on the outer cylindrical surface around the axial direction of the rotor yoke (12), and a plurality of rotating shaft salient poles (14) uniformly arranged on the surface around the axial direction of the rotating shaft (11). Stator component (2), the stator component (2) includes a stator sleeve (21), an annular permanent magnet (22) embedded in the inner wall of the stator sleeve (21), a stator yoke (23) sleeved on the inner wall of the stator sleeve (21), a plurality of stator salient poles (24) uniformly arranged on the inner cylinder surface around the axial direction of the stator yoke (23), and an armature winding (25) uniformly wound around the periphery of each stator salient pole (24); and, The monitoring component (3) includes a disk (31) disposed on the inner wall of the stator sleeve (21) and a Hall sensor (32) fixedly installed on the inner ring surface of the disk (31). The number of the rotating shaft salient pole (14) and the stator salient pole (24) is set in accordance with the matching standard of the stator pole number and rotor pole number of a double salient pole motor.

2. The doubly salient permanent magnet motor according to claim 1, characterized in that: The Hall sensor (32) is specifically configured as three groups, and the three groups of Hall sensors (32) are Hall sensor No. 1 (321), Hall sensor No. 2 (322) and Hall sensor No. 3 (323).

3. A doubly salient permanent magnet motor according to claim 2, characterized in that: The disk (31) has a central hole along its central axis for the rotating shaft (11) to pass through, and the disk (31) and the rotating shaft convex pole (14) are arranged on the same horizontal plane.

4. A doubly salient permanent magnet motor according to claim 3, characterized in that: There is a horizontal air gap between the disk (31) and the rotating shaft (11), and the width of the horizontal air gap is 1.5mm to 2mm; The Hall sensor (32) is located in the horizontal air gap between the disk (31) and the rotating shaft (11), and the size of the Hall sensor (32) is smaller than the horizontal air gap.

5. A doubly salient permanent magnet motor according to claim 4, characterized in that: The first Hall sensor (321) and the second Hall sensor (322) are separated by an angle of 60°, and the second Hall sensor (322) and the third Hall sensor (323) are separated by an angle of 60°.

6. A doubly salient permanent magnet motor according to claim 5, characterized in that: The center of the Hall sensor (32) is aligned with the edge of the rotating shaft salient pole (14).

7. A doubly salient permanent magnet motor according to claim 6, characterized in that: The salient pole (14) of the rotating shaft is formed by uniformly opening slots on the surface of the rotating shaft (11), and the salient pole (14) of the rotating shaft (11) is integrally designed with the rotating shaft (11).

8. A doubly salient permanent magnet motor according to claim 7, characterized in that: The number of the rotating shaft salient poles (14) is the same as the number of the rotor salient poles (13), and the rotating shaft salient poles (14) and the rotor salient poles (13) are arranged in a one-to-one correspondence around the axis of the rotating shaft (11).

9. A doubly salient permanent magnet motor according to claim 8, characterized in that: The stator sleeve (21) includes an upper sleeve (211) and a lower sleeve (212). The annular permanent magnet (22) is embedded between the upper sleeve (211) and the lower sleeve (212). The stator yoke (23) is disposed on the inner wall of the lower sleeve (212). The disk (31) is disposed on the inner wall of the upper sleeve (211).

10. A double salient pole permanent magnet motor according to claim 9, characterized in that: The number of rotor salient poles (13) is set to 4, and the number of stator salient poles (24) is set to 6.

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