Stator permanent magnet motor with composite shielding sheath

Abstract

The invention provides a stator permanent magnet motor with a composite shielding sheath. The stator permanent magnet motor comprises the composite shielding sheath, a stator salient pole iron core, an armature winding, a rotor salient pole iron core and a permanent magnet, the armature windings and the permanent magnets are arranged on the stator salient pole iron cores; the composite shielding sheath is located in the air gap space of the motor and clings to the inner side wall of the stator salient pole iron core; the composite shielding sheath comprises a plurality of magnetic conductive blocks and a plurality of non-magnetic conductive blocks. And the plurality of magnetic conductive blocks and the plurality of non-magnetic conductive blocks are alternately arranged along the inner side wall of the stator salient pole iron core. According to the invention, the torque output capability of the motor can be improved and reliable physical isolation between the stator and the rotor of the motor can be ensured under the condition that the motor needs to be provided with the shielding sheath in the air gap space to realize severe environment isolation and the equivalent electromagnetic air gap of the motor is too large.

Description

Technical Field

[0001] The present invention relates to the technical field of permanent magnet motor equipment, and specifically, to a stator permanent magnet motor with a composite shielding sheath. Background Art

[0002] Due to the advantages of high power factor, high power density, and high torque density, permanent magnet motors are widely used in industry. In traditional permanent magnet motors, permanent magnets are assembled on the rotor. However, due to structural limitations, their processing technology is relatively complex, the maximum speed is limited, rotor heat dissipation is difficult, and there is a risk of irreversible demagnetization of the permanent magnets.

[0003] In response to the above problems, stator permanent magnet motors have been proposed. Their permanent magnets and armature windings are both located on the stator side, which is convenient for installation. The permanent magnets are stationary and there is no risk of centrifugal force, making it easy to achieve thermal management of the armature windings and permanent magnets. According to the different placement positions of the permanent magnets, stator permanent magnet motors can be divided into flux-reversal motors, flux-switching motors, and doubly salient motors, etc. In a flux-reversal motor, the permanent magnets are surface-mounted on the surfaces of the salient poles of the stator core and magnetized in the radial direction. It has less permanent magnet consumption and thus has an obvious cost advantage. In a flux-switching motor, the permanent magnets are embedded in the middle of the salient poles of the stator core and magnetized in the tangential direction. The magnetic concentration effect between adjacent permanent magnets gives it a higher torque density. In a doubly salient motor, the permanent magnets are installed on the stator yoke and magnetized in the tangential direction. Its special structure makes its control method flexible and variable.

[0004] On the other hand, in some actual application scenarios, it is necessary to use a motor system to drive a load in special environments such as high temperature, high pressure, toxic gases / liquids, and high cleanliness vacuum to achieve mechanical actions. At this time, it is often necessary to place the rotating components of the motor in a shielding sheath to drive the load while keeping it isolated from the external environment. However, at this time, the stator components of the motor and the corresponding electrical ports are located outside the shielding sheath for connecting to the power supply. Correspondingly, the rotor components and stator components of the motor are separated by the shielding sheath, resulting in an increase in the air gap of the motor and sacrificing the performance of the motor.

[0005] Specifically, there are neither permanent magnets nor exciting windings on the salient pole rotor of a stator permanent magnet motor. Therefore, its mechanical structure is robust and strong, and its rotor can work stably for a long time in harsh environments such as high temperature, high pressure, and toxic gases. However, in order to isolate the harsh environments such as high temperature, high pressure, and toxic gases / liquids on the rotor side, a non-magnetic shielding sheath usually needs to be assembled. This non-magnetic shielding sheath will significantly increase the equivalent air gap length between the stator and rotor iron cores of the motor, reduce the no-load back electromotive force, and greatly inhibit the torque output ability of the stator permanent magnet motor.

[0006] The patent document with the publication number WO2020125248A1 discloses an alternating-pole permanent-magnet biased bearingless doubly salient motor and its control method, which relates to the technical field of bearingless motors and can alleviate the problems of winding loss and unbalanced heating, improving the reliability of the motor. The solution includes: the iron cores of the stator / rotor are both salient-pole structures. Each stator pole face is slotted from the middle part of the air-gap surface to the edge part of the stator pole in the counterclockwise direction, and a permanent magnet is pasted in the slot. Each permanent magnet has the same polarity facing the air-gap surface; Each stator pole is wound with an armature coil, and the armature coils are connected in series in turn to form an armature winding, and the armature winding is respectively connected to an external main circuit; Every three stator poles are wound with suspension coils, and the suspension coils that are radially opposite in space are connected in series to form a suspension winding, which is connected to an external suspension control circuit. It is applicable to high-speed application occasions such as aerospace electric drive systems. However, this patent document still has the defect that the air gap of the motor increases, sacrificing the performance of the motor. Summary of the Invention

[0007] In view of the defects in the prior art, the purpose of the present invention is to provide a stator permanent-magnet motor with a composite shielding sheath.

[0008] A stator permanent-magnet motor with a composite shielding sheath according to the present invention includes: a composite shielding sheath, a stator salient-pole iron core, an armature winding, a rotor salient-pole iron core, and a permanent magnet;

[0009] The armature winding and the permanent magnet are both installed on the stator salient-pole iron core;

[0010] The composite shielding sheath is located in the air-gap space of the motor, and the inner side wall of the stator salient-pole iron core is arranged around the composite shielding sheath;

[0011] The composite shielding sheath includes: a plurality of magnetic conduction blocks and a plurality of non-magnetic conduction blocks; the plurality of magnetic conduction blocks and the plurality of non-magnetic conduction blocks are arranged alternately along the inner side wall of the stator salient-pole iron core.

[0012] Preferably, the stator salient-pole iron core includes: a stator yoke and a plurality of stator teeth;

[0013] The plurality of stator teeth are arranged at intervals along the inner side wall of the stator yoke on the stator yoke; an armature winding is arranged between two adjacent stator teeth;

[0014] One end of the stator tooth is connected to the inner side wall of the stator yoke, and the other end of the stator tooth is directed towards the composite shielding sheath.

[0015] Preferably, the rotor salient-pole iron core includes: a rotor yoke and a plurality of rotor teeth;

[0016] The plurality of rotor teeth are arranged at intervals along the outer side wall of the rotor yoke on the rotor yoke;

[0017] One end of the rotor tooth is connected to the outer side wall of the rotor yoke, and the other end of the rotor tooth guides to the composite shielding sheath.

[0018] Preferably, the permanent magnet is arranged in any of the following ways:

[0019] Way 1: The permanent magnet is surface-mounted on the surface of the stator tooth for radial magnetization.

[0020] Way 2: The permanent magnet is embedded in the stator tooth for tangential magnetization.

[0021] Way 3: The permanent magnet is arranged on the stator yoke for tangential magnetization.

[0022] Preferably, when the permanent magnet is used for radial magnetization, the polarities of two adjacent permanent magnets magnetized in the radial direction are opposite.

[0023] When the permanent magnet is used for tangential magnetization, the polarities of two adjacent permanent magnets magnetized in the tangential direction are opposite.

[0024] When the permanent magnet is used for radial magnetization, the permanent magnet magnetized in the radial direction adopts any of the following magnetization methods: radial magnetization method, parallel magnetization method, Halbach array magnetization method.

[0025] Preferably, the number of the magnetic conduction blocks is greater than or equal to the number of the stator teeth, forming a structure of multiple poles per tooth.

[0026] Preferably, there is a connecting bridge between two adjacent magnetic conduction blocks, and the non-magnetic conduction block is inserted between two adjacent magnetic conduction blocks.

[0027] Or, there is a connecting bridge between two adjacent non-magnetic conduction blocks, and the magnetic conduction block is inserted between two adjacent non-magnetic conduction blocks.

[0028] Preferably, the non-magnetic conduction block and the magnetic conduction block are of different material structures.

[0029] Or, the composite shielding sheath is of one material structure, and the non-magnetic conduction block and the magnetic conduction block are formed by local processing, constituting an integral body.

[0030] Preferably, the composite shielding sheath, the stator salient pole iron core, the armature winding and the permanent magnet are static components.

[0031] The rotor salient pole iron core is a rotating component and can rotate tangentially.

[0032] Preferably, the number of the magnetic conduction blocks is equal to the number of the non-magnetic conduction blocks.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] 1. For the stator permanent magnet motor with a composite shielding sheath of the present invention, the shielding sheath is composed of non-magnetic blocks and magnetic blocks arranged alternately. Compared with the traditional non-magnetic shielding sheath, it can reduce the equivalent electromagnetic air gap. At the same time, by using the magnetic field modulation effect of the magnetic blocks, the no-load back electromotive force of the motor can be significantly increased, and the torque output ability of the stator permanent magnet motor can be enhanced.

[0035] 2. For the stator permanent magnet motor with a composite shielding sheath of the present invention, the number of magnetic blocks in the composite shielding sheath can be designed flexibly, which can be equal to the number of stator teeth in the stator salient pole core or greater than the number of stator teeth in the stator salient pole core, forming a one-tooth multi-pole structure.

[0036] 3. For the stator permanent magnet motor with a composite shielding sheath of the present invention, there are neither permanent magnets nor excitation windings on the salient pole rotor, and the mechanical structure is robust and can work stably for a long time in harsh environments of high temperature and high pressure.

[0037] 4. For the stator permanent magnet motor with a composite shielding sheath of the present invention, the slot and pole numbers of the stator and rotor can be selected flexibly, and the selection rule conforms to the law of traditional stator permanent magnet motors. The radial thickness of the composite shielding sheath can also be designed flexibly according to actual needs.

[0038] 5. For the stator permanent magnet motor with a composite shielding sheath of the present invention, the placement position of the permanent magnet can be adjusted flexibly. It can be surface-mounted on the surface of the salient pole teeth of the stator core as a flux-reversal motor, or embedded in the middle of the salient pole teeth of the stator core as a flux-switching motor, or placed at the stator yoke of the stator core as a doubly salient motor.

[0039] 6. For the stator permanent magnet motor with a composite shielding sheath of the present invention, the concentrated armature winding has a shorter coil end length, which is beneficial to reducing the copper loss of the motor, improving the efficiency and power density, and reducing the cost.

[0040] 7. For the stator permanent magnet motor with a composite shielding sheath of the present invention, the composite shielding sheath can be locally processed from the same material, or two different materials can be used to process the non-magnetic blocks and magnetic blocks respectively. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] By reading the detailed description of the non-limiting embodiments with reference to the following drawings, other features, objects, and advantages of the present invention will become more apparent:

[0042] Figure 1 FIG. is a schematic structural diagram of a stator permanent magnet motor with a surface-mounted permanent magnet and a composite shielding sheath of the present invention.

[0043] Figure 2 Schematic structural diagram of a stator permanent magnet motor with an embedded permanent magnet and a composite shielding sheath according to the present invention.

[0044] As shown in the figure:

[0045] Composite shielding sheath 1, stator yoke 202

[0046] Non-magnetic block 101, armature winding 3

[0047] Magnetic conduction block 102, rotor salient pole core 4

[0048] Stator salient pole core 2, permanent magnet 5

[0049] Stator tooth 201 Specific embodiments

[0050] The present invention will be described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several changes and improvements can still be made. These all belong to the protection scope of the present invention.

[0051] Example 1

[0052] As Figure 1 and Figure 2 shown, this embodiment provides a stator permanent magnet motor with a composite shielding sheath, including: a composite shielding sheath 1, a stator salient pole core 2, an armature winding 3, a rotor salient pole core 4, and a permanent magnet 5; the armature winding 3 and the permanent magnet 5 are both installed on the stator salient pole core 2; the composite shielding sheath 1 is located in the air gap space of the motor, and the inner side wall of the stator salient pole core 2 is arranged around the composite shielding sheath 1; the composite shielding sheath 1 includes: a plurality of magnetic conduction blocks 102 and a plurality of non-magnetic blocks 101; the plurality of magnetic conduction blocks 102 and the plurality of non-magnetic blocks 101 are alternately arranged along the inner side wall of the stator salient pole core 2.

[0053] As Figure 1 shown, in a flux-reversal motor, the composite shielding sheath 1 is in close contact with the permanent magnet 5. As Figure 2 shown, in a flux-switching motor and a doubly salient pole motor, the composite shielding sheath 1 is in close contact with the inner side wall of the stator salient pole core 2.

[0054] The rotor salient pole core 4 includes: a rotor yoke and a plurality of rotor teeth; the plurality of rotor teeth are arranged on the rotor yoke at intervals along the outer side wall of the rotor yoke; one end of the rotor tooth is connected to the outer side wall of the rotor yoke, and the other end of the rotor tooth is directed to the composite shielding sheath 1. The stator salient pole core 2 includes: a stator yoke 202 and a plurality of stator teeth 201; the plurality of stator teeth 201 are arranged on the stator yoke 202 at intervals along the inner side wall of the stator yoke 202; an armature winding 3 is arranged between two adjacent stator teeth 201; one end of the stator tooth 201 is connected to the inner side wall of the stator yoke 202, and the other end of the stator tooth 201 is directed to the composite shielding sheath 1 for arrangement.

[0055] As Figure 1 shown, in the flux reversal motor, the other end of the stator tooth 201 is connected to the permanent magnet 5. As Figure 2 shown, in the flux switching motor and the doubly salient pole motor, the other end of the stator tooth 201 is connected to the composite shielding sheath 1.

[0056] The number of the magnetic conduction blocks 102 is greater than or equal to the number of the stator teeth 201, forming a structure of one tooth with multiple poles. There is a connecting bridge between two adjacent magnetic conduction blocks 102, and the non-magnetic conduction block 101 is inserted between two adjacent magnetic conduction blocks 102; or, there is a connecting bridge between two adjacent non-magnetic conduction blocks 101, and the magnetic conduction block 102 is inserted between two adjacent non-magnetic conduction blocks 101. The non-magnetic conduction block 101 and the magnetic conduction block 102 are of different material structures; or, the composite shielding sheath 1 is of one material structure, and the non-magnetic conduction block 101 and the magnetic conduction block 102 are formed by local processing to form a whole.

[0057] The permanent magnet 5 adopts any one of the following setting methods: Method 1: The permanent magnet 5 is surface-mounted on the surface of the stator tooth 201 for radial magnetization; Method 2: The permanent magnet 5 is embedded in the stator tooth 201 for tangential magnetization; Method 3: The permanent magnet 5 is arranged on the stator yoke 202 for tangential magnetization. When the permanent magnet 5 is used for radial magnetization, the polarities of two adjacent radially magnetized permanent magnets 5 are opposite; when the permanent magnet 5 is used for tangential magnetization, the polarities of two adjacent tangentially magnetized permanent magnets 5 are opposite; when the permanent magnet 5 is used for radial magnetization, the radially magnetized permanent magnet 5 adopts any one of the following magnetization methods: radial magnetization method, parallel magnetization method, Halbach array magnetization method.

[0058] The composite shielding sheath 1, the stator salient pole core 2, the armature winding 3 and the permanent magnet 5 are stationary components; the rotor salient pole core 4 is a rotating component and can rotate tangentially. The number of the magnetic conduction blocks 102 is equal to the number of the non-magnetic conduction blocks 101.

[0059] Example 2

[0060] Those skilled in the art can understand this embodiment as a more specific description of Embodiment 1.

[0061] As Figure 1 and Figure 2 shown, this embodiment also provides a stator permanent magnet motor with a composite shielding sheath, including a composite shielding sheath 1, a stator salient pole core 2, an armature winding 3, a rotor salient pole core 4, and a permanent magnet 5.

[0062] The armature winding 3 and the permanent magnet 5 are both installed on the stator salient pole core 2; the composite shielding sheath 1 is composed of alternately arranged magnetic conduction blocks 102 and non-magnetic conduction blocks 101, located in the air gap space of the motor and closely attached to the inner side of the stator salient pole core 2. The stator salient pole core 2 includes stator teeth 201 and a stator yoke 202. The rotor salient pole core 4 includes rotor teeth and a rotor yoke. The stator teeth 201 are salient pole teeth.

[0063] The permanent magnet 5 is surface-mounted on the surface of the stator teeth 201 of the stator core 2, magnetized in the radial direction, or the permanent magnet 5 is embedded in the middle of the stator teeth 201 of the stator core 2, magnetized in the tangential direction, or the permanent magnet 5 is placed at the stator yoke 202 of the stator core 2, magnetized in the tangential direction.

[0064] The polarities of two adjacent radially magnetized permanent magnets 5 are opposite, or the polarities of two adjacent tangentially magnetized permanent magnets 5 are opposite. In practical applications, the radially magnetized permanent magnet 5 can adopt a radial magnetization method, a parallel magnetization method, or a Halbach array magnetization method.

[0065] The number of magnetic conduction blocks 102 in the composite shielding sheath 1 is equal to the number of stator teeth 201 in the stator salient pole core 2, or greater than the number of stator teeth 201 in the stator salient pole core 2, forming a one-tooth multi-pole structure.

[0066] There is a connecting bridge between two adjacent magnetic conduction blocks 102 in the composite shielding sheath 1, and the non-magnetic conduction block 101 is inserted between two adjacent magnetic conduction blocks 102; or there is a connecting bridge between two adjacent non-magnetic conduction blocks 101, and the magnetic conduction block 102 is inserted between two non-magnetic conduction blocks 101. The non-magnetic conduction block 101 and the magnetic conduction block 102 are processed from two different materials; or the composite shielding sheath 1 is formed by locally processing the same material to form the non-magnetic conduction block 101 and the magnetic conduction block 102, constituting a whole.

[0067] The composite shielding sheath 1, the stator salient pole core 2, the armature winding 3, and the permanent magnet 5 are stationary components, and the rotor salient pole core 4 is a rotating component and can rotate tangentially.

[0068] The number of slots of the stator salient pole core 2 and the number of teeth of the rotor salient pole core 4 are flexibly selected according to actual needs; the number of magnetic conduction blocks 102 of the composite shielding sheath 1 is equal to the number of non-magnetic conduction blocks 101, and their numbers can be flexibly adjusted, and their radial thicknesses can also be flexibly adjusted according to actual needs.

[0069] A radial gap is left between the shielding sheath and the rotor salient pole core to ensure the free tangential rotation of the rotor salient pole core; the stator salient pole core, the armature winding, the permanent magnet, the shielding sheath and the rotor salient pole core together form a stator permanent magnet motor, wherein the rotor salient pole core can rotate and is located inside the shielding sheath and can be in a harsh environment isolated from the outside.

[0070] The armature winding is a concentrated armature winding.

[0071] This embodiment discloses a stator permanent magnet motor with a composite shielding sheath, including a stator salient pole core, a rotor salient pole core, a permanent magnet, an armature winding and a composite shielding sheath. The permanent magnet and the armature winding are installed on the stator salient pole core; the composite shielding sheath is composed of alternately arranged magnetic conduction blocks and non-magnetic conduction blocks, is located in the air gap space between the stator and the rotor, and is closely attached to the inner side of the stator. Compared with the prior art, in the case where the motor needs to set a shielding sheath in the air gap space to achieve harsh environment isolation, resulting in a relatively large equivalent electromagnetic air gap of the motor, this embodiment can improve the torque output ability of the motor and ensure reliable physical isolation between the stator and the rotor of the motor.

[0072] The purpose of the present invention is to provide a stator permanent magnet motor with a composite shielding sheath to overcome the defects of the above-mentioned prior art. Under the condition that it is necessary to prevent a large equivalent air gap caused by the shielding sheath between the stator and the rotor of the motor, the present invention can improve the torque output ability of the motor on the basis of ensuring physical isolation between the stator and the rotor of the motor. The present invention is particularly suitable for application occasions where the motor rotor needs to work in high temperature, high pressure, toxic gas / liquid environments.

[0073] Example 3

[0074] Those skilled in the art can understand this embodiment as a more specific description of Embodiment 1.

[0075] As Figure 1 shown, in this embodiment, the stator permanent magnet motor with a composite shielding sheath is a radial magnetic field rotating motor, which includes a composite shielding sheath 1, a stator salient pole core 2, an armature winding 3, a rotor salient pole core 4 and a permanent magnet 5.

[0076] The motor has a twelve-slot and ten-pole structure. The armature winding is a three-phase winding, including twelve concentrated winding coils wound on the stator teeth, with four coils per phase. The stator salient pole core 2 includes twelve stator teeth 201 and a stator yoke 202. Twelve permanent magnets 5 are surface-mounted on the surface of each stator tooth 201, all magnetized in the radial direction, and the magnetization directions of any two adjacent permanent magnets are opposite, making it a flux-reversal motor. The rotor salient pole core 4 includes ten rotor teeth and a rotor yoke. The composite shielding sheath 1 is composed of twelve non-magnetic blocks 101 and twelve magnetic blocks 102 arranged alternately, located in the air gap of the motor and closely attached to the inner side of the permanent magnet 5.

[0077] In this embodiment, the numbers of the concentrated winding coils, stator teeth 201, permanent magnets 5, non-magnetic blocks 101, and magnetic blocks 102 of the stator permanent magnet motor with a composite shielding sheath are all equal, which is twelve.

[0078] The magnetic blocks 102 in the composite shielding sheath 1 are aligned with the permanent magnets 5 in the radial direction, helping the permanent magnet flux and the armature winding flux to smoothly flow from the stator salient pole core 2 into the rotor salient pole core 4, improving the no-load back electromotive force and output torque of the motor. The non-magnetic blocks 101 in the composite shielding sheath 1 are aligned with the slots of the stator salient pole core 2 in the radial direction to prevent the permanent magnet flux and the armature winding flux from directly forming a leakage magnetic circuit after passing through the magnetic blocks 102 without passing through the rotor salient pole core 4.

[0079] In addition, the radial thickness of the composite shielding sheath of the stator permanent magnet motor involved in this embodiment can be flexibly adjusted according to actual needs.

[0080] Example 4

[0081] As Figure 2 shown, the pole-slot number matching and winding phase number of the motor in this embodiment are the same as those in Embodiment 3. The main difference between the two is that the twelve permanent magnets 5 in Embodiment 2 are embedded in the middle of the salient pole teeth 201 of the stator core 2 and operate as a flux-switching motor. It includes a composite shielding sheath 1, a stator salient pole core 2, an armature winding 3, a rotor salient pole core 4, and permanent magnets 5.

[0082] Twelve armature winding coils 3 are respectively wound on the salient pole teeth 201 of the stator core 2 and the embedded permanent magnets 5 sandwiched between them. The permanent magnets 5 are magnetized in the tangential direction, and the magnetization directions of any two adjacent permanent magnets are opposite. The composite shielding sheath 1 is composed of twenty-four non-magnetic blocks 101 and twenty-four magnetic blocks 102 arranged alternately, located in the air gap of the motor and closely attached to the inner sides of the stator teeth 201 and the permanent magnets 5.

[0083] In this embodiment, the twenty-four magnetic conduction blocks 102 in the composite shielding sheath 1 are aligned with the stator teeth 201 in the radial direction, helping the permanent magnet magnetic flux and the armature winding magnetic flux to smoothly flow from the stator salient pole core 2 into the rotor salient pole core 4, and improving the no-load back electromotive force and output torque of the motor. The twenty-four non-magnetic conduction blocks 101 in the composite shielding sheath 1 are aligned with the slots or permanent magnets 5 of the stator salient pole core 2 in the radial direction to prevent the permanent magnet magnetic flux and the armature winding magnetic flux from directly forming a magnetic leakage loop after flowing through the magnetic conduction blocks 102 without passing through the rotor salient pole core 4.

[0084] When the motor of the present invention needs to be provided with a shielding sheath in the air gap space to achieve isolation in a harsh environment, resulting in a relatively large equivalent electromagnetic air gap of the motor, the torque output ability of the motor can be improved, and reliable physical isolation between the stator and the rotor of the motor can be ensured.

[0085] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application 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 should not be construed as a limitation to the present application.

[0086] The specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. Without conflict, the embodiments of the present application and the features in the embodiments can be arbitrarily combined with each other.

Claims

1. A stator permanent magnet motor with a composite shielding sheath, characterized in that, Including: A composite shielding sheath (1), a stator salient pole core (2), an armature winding (3), a rotor salient pole core (4), and a permanent magnet (5); Both the armature winding (3) and the permanent magnet (5) are installed on the stator salient pole core (2); The composite shielding sheath (1) is located in the air gap space of the motor, and the inner side wall of the stator salient pole core (2) is arranged around the composite shielding sheath (1); The composite shielding sheath (1) includes: a plurality of magnetic conduction blocks (102) and a plurality of non-magnetic conduction blocks (101); The plurality of magnetic conduction blocks (102) and the plurality of non-magnetic conduction blocks (101) are alternately arranged along the inner side wall of the stator salient pole core (2).

2. The stator permanent magnet motor with a composite shielding sheath according to claim 1, wherein The stator salient pole core (2) includes: a stator yoke (202) and a plurality of stator teeth (201); The plurality of stator teeth (201) are spaced apart along the inner side wall of the stator yoke (202) and arranged on the stator yoke (202); One of the armature windings (3) is arranged between two adjacent stator teeth (201); One end of the stator tooth (201) is connected to the inner side wall of the stator yoke (202), and the other end of the stator tooth (201) is directed towards the composite shielding sheath (1).

3. The stator permanent magnet motor with a composite shielding sheath according to claim 1, characterized in that, The rotor salient pole core (4) includes: a rotor yoke and a plurality of rotor teeth; The plurality of rotor teeth are spaced apart along the outer side wall of the rotor yoke and arranged on the rotor yoke; One end of the rotor tooth is connected to the outer side wall of the rotor yoke, and the other end of the rotor tooth is directed towards the composite shielding sheath (1).

4. The stator permanent magnet motor with a composite shielding sheath according to claim 2, characterized in that, The permanent magnet (5) adopts any one of the following setting methods: Method 1: The permanent magnet (5) is surface-mounted on the surface of the stator tooth (201) for radial magnetization; Method 2: The permanent magnet (5) is embedded in the stator tooth (201) for tangential magnetization; Method 3: The permanent magnet (5) is arranged on the stator yoke (202) for tangential magnetization.

5. The stator permanent magnet motor with a composite shielding sheath according to claim 4, characterized in that, When the permanent magnet (5) is used for radial magnetization, the polarities of two adjacent radially magnetized permanent magnets (5) are opposite; When the permanent magnet (5) is used for tangential magnetization, the polarities of two adjacent tangentially magnetized permanent magnets (5) are opposite; When the permanent magnet (5) is used for radial magnetization, the permanent magnet (5) magnetized in the radial direction adopts any one of the following magnetization methods: radial magnetization method, parallel magnetization method, Halbach array magnetization method.

6. The stator permanent magnet motor with a composite shielding sheath according to claim 2, characterized in that, The number of the magnetic conduction blocks (102) is greater than or equal to the number of the stator teeth (201), forming a structure of one tooth with multiple poles.

7. The stator permanent magnet motor with a composite shielding sheath according to claim 2, characterized in that, There is a connecting bridge between two adjacent magnetic conduction blocks (102), and the non-magnetic conduction block (101) is inserted between two adjacent magnetic conduction blocks (102); Or, there is a connecting bridge between two adjacent non-magnetic conduction blocks (101), and the magnetic conduction block (102) is inserted between two adjacent non-magnetic conduction blocks (101).

8. The stator permanent magnet motor with a composite shielding sheath according to claim 2, characterized in that, The non-magnetic conduction block (101) and the magnetic conduction block (102) are of different material structures; Alternatively, the composite shielding sheath (1) is a material structure, and the non-magnetic block (101) and the magnetic block (102) are formed by local processing to form an integral whole.

9. The stator permanent magnet motor with a composite shielding sheath according to claim 1, characterized in that, The composite shielding sheath (1), the stator salient pole core (2), the armature winding (3), and the permanent magnet (5) are stationary components; The rotor salient pole core (4) is a rotating component and can rotate tangentially.

10. The stator permanent magnet motor with a composite shielding sheath according to claim 1, characterized in that, The number of the magnetic blocks (102) is equal to the number of the non-magnetic blocks (101).

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