A stator permanent magnet motor with reduced air gap magnetic reluctance

Abstract

A stator permanent magnet motor with reduced air gap magnetic reluctance includes: a stator assembly comprising an annular stator core and a plurality of stator teeth evenly distributed along its circumference, wherein the outer surface of the plurality of stator teeth is provided with axially extending permanent magnet mounting slots, and permanent magnets are embedded in the slots to form a multi-pole magnetic field; a rotor assembly comprising a coaxially arranged rotor core, wherein the outer circumferential surface of the rotor core is provided with rotor teeth that are staggered with the stator teeth to form an asymmetrical tooth groove structure; the permanent magnet mounting slots are formed at the top of the stator teeth and are T-shaped; the rotor teeth adopt a stepped profile structure and mesh with the T-shaped permanent magnet mounting slots. The stepped profile rotor teeth and the T-shaped permanent magnet mounting slots mesh tightly, and their sidewalls are in contact with each other, which strengthens the structural connection between the permanent magnet mounting slots and the rotor teeth, optimizes the air gap magnetic flux density distribution, reduces air gap magnetic reluctance, and avoids the occurrence of increased excitation current and decreased power factor due to increased magnetic reluctance.

Description

Technical Field

[0001] This utility model relates to the field of stator permanent magnet motor technology, specifically a stator permanent magnet motor that can reduce air gap magnetic resistance. Background Technology

[0002] The air gap magnetic field is a magnetic field system formed at the gap between the stator and rotor of a motor, consisting of main magnetic flux and leakage flux. The main magnetic flux passes through the air gap and enters the rotor to form an effective magnetic circuit, generating induced electromotive force and electromagnetic torque in the armature winding; the leakage flux only forms a closed path around the stator and does not participate in energy conversion. In traditional stator permanent magnet motors, the stator and rotor are connected by a mating connection between permanent magnet mounting slots and rotor teeth. However, due to the poor structural tightness of the connection between the permanent magnet mounting slots and rotor teeth, the air gap magnetic reluctance increases, leading to an increase in excitation current and a decrease in power factor. Utility Model Content

[0003] In view of the above, this utility model provides a stator permanent magnet motor that can reduce air gap magnetic reluctance, so as to solve the problems mentioned in the background art.

[0004] The technical solution adopted by this utility model to solve its technical problem is as follows: a stator permanent magnet motor that can reduce air gap magnetic resistance is provided, including: a stator assembly, including an annular stator core and a plurality of stator teeth evenly distributed along its circumference, wherein the outer surface of the plurality of stator teeth is provided with axially extending permanent magnet mounting slots, and permanent magnets are embedded in the slots to form a multi-pole magnetic field; a rotor assembly, including a coaxially arranged rotor core, wherein the outer circumferential surface of the rotor core is provided with rotor teeth that are staggered and correspond to the stator teeth to form an asymmetrical tooth groove structure; the permanent magnet mounting slots are opened at the top of the stator teeth, and the permanent magnet mounting slots are T-shaped structures; the rotor teeth adopt a stepped contour structure and mesh with the T-shaped permanent magnet mounting slots to reduce air gap magnetic resistance.

[0005] Preferably, it also includes a stator winding mechanism, comprising a multiphase armature winding wound in a permanent magnet mounting slot.

[0006] Preferably, it also includes a rotor winding mechanism, comprising independently configured induction windings and excitation windings.

[0007] Preferably, the number of pole pairs of the induction winding is the same as the number of poles of the permanent magnet, and it is wound in the first set of slots of the rotor teeth; the number of pole pairs of the excitation winding is the same as the number of pole pairs of the armature winding, and it is wound in the second set of slots of the rotor teeth; the two sets of windings are connected in a star or delta configuration by a bridging wire.

[0008] Preferably, the permanent magnets are surface-mounted, and their magnetization directions are arranged alternately in a radial direction, with adjacent permanent magnets having opposite polarities.

[0009] Preferably, the stator core and the rotor core are constructed by laminating high-permeability materials, with the lamination direction parallel to the motor axis.

[0010] This invention relates to a stator permanent magnet motor that reduces air gap magnetic reluctance. The outer circumferential surface of the rotor core is provided with rotor teeth that intersect with the stator teeth, forming an asymmetrical tooth groove structure. The permanent magnet mounting slot is opened on the top of the stator teeth. The permanent magnet mounting slot has a T-shaped structure. At the same time, the rotor teeth adopt a stepped contour structure and mesh with the T-shaped permanent magnet mounting slot. This optimizes the air gap magnetic flux density distribution and strengthens the structural connection between the permanent magnet mounting slot and the rotor teeth, thereby reducing air gap magnetic reluctance and avoiding the situation where the excitation current increases and the power factor decreases due to the increase in magnetic reluctance. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this utility model.

[0012] Figure 2 This is a structural schematic diagram of the stator core, stator teeth, and permanent magnet mounting slots.

[0013] Figure 3 This is a schematic diagram of the rotor core and rotor teeth.

[0014] Figure 4 This is a schematic diagram of the structure for the tight connection between the permanent magnet mounting slot and the rotor teeth.

[0015] Figure 5 This is a schematic diagram of the electrical connection between the induction winding and the excitation winding.

[0016] In the diagram, 1 is the stator core; 2 is the rotor core; 3 is the permanent magnet; 4 is the multiphase armature winding; 5 is the induction winding; 6 is the excitation winding; 7 is the stator teeth; 8 is the permanent magnet mounting slot; and 9 is the rotor teeth. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings and some embodiments.

[0018] exist Figure 1-5The present invention provides a stator permanent magnet motor with reduced air gap magnetic reluctance, comprising: a stator assembly including an annular stator core 1 and a plurality of stator teeth 7 evenly distributed along its circumference, wherein the outer surface of the plurality of stator teeth 7 is provided with axially extending permanent magnet mounting slots 8, and permanent magnets 3 are embedded in the slots to form a multi-pole magnetic field; and a rotor assembly including a coaxially arranged rotor core 2, wherein the outer circumferential surface of the rotor core 2 is provided with rotor teeth 9 that are staggered and correspond to the stator teeth 7, forming an asymmetrical tooth groove structure; wherein the permanent magnet mounting slots 8 are formed in the stator teeth. The rotor tooth 9 has a stepped profile structure and meshes with the T-shaped permanent magnet mounting groove 8. The stepped profile rotor tooth 9 and the T-shaped permanent magnet mounting groove 8 are tightly meshed, and their sidewalls are in contact with each other, which strengthens the structural connection between the permanent magnet mounting groove 8 and the rotor tooth 9, optimizes the air gap magnetic flux density distribution, thereby reducing the air gap magnetic reluctance and avoiding the situation where the excitation current increases and the power factor decreases due to the increase in magnetic reluctance.

[0019] In this embodiment, a stator winding mechanism is also included, comprising a multi-phase armature winding 4 wound in the permanent magnet mounting slot 8; a rotor winding mechanism is also included, comprising an independently configured induction winding 5 and an excitation winding 6; the induction winding 5 has the same number of pole pairs as the permanent magnet 3 and is wound in the first set of slots of the rotor teeth 9; the excitation winding 6 has the same number of pole pairs as the armature winding and is wound in the second set of slots of the rotor teeth 9; the two sets of windings are connected by a bridging wire to form a star or delta electrical connection; the introduction of independently configured induction winding 5 and excitation winding 6 into the rotor winding mechanism forms a dual winding structure, the induction winding 5 and the excitation winding 6 are alternately arranged in the circumferential direction of the rotor core 2 and are connected to each other by a specific electrical connection method (such as star or delta connection), this structure allows the induced electromotive force generated by the induction winding 5 to directly act on the excitation winding 6 without the need for additional rectification or conversion devices, thereby simplifying the circuit structure and improving energy conversion efficiency.

[0020] In this embodiment, the permanent magnets 3 are surface-mounted, with their magnetization direction alternating radially, and adjacent permanent magnets 3 having opposite polarities. The permanent magnets 3 are surface-mounted and arranged sequentially along the circumference of the stator core 1, forming multiple magnetic poles. The magnetization direction of the permanent magnets 3 is radially alternating, and adjacent permanent magnets 3 have opposite polarities. Furthermore, the magnetic pole configuration of the permanent magnets 3 matches the number of poles of the induction winding 5 and the excitation winding 6 to ensure that the motor can generate a stable rotating magnetic field and electromagnetic force during operation.

[0021] In this embodiment, the stator core 1 and rotor core 2 are constructed by laminating high-permeability materials, with the lamination direction parallel to the motor axis. High-permeability materials ensure good permeability, saturation magnetic induction, resistivity, and other factors, guaranteeing optimal performance of the stator core 1 and rotor core 2. This design helps reduce magnetic reluctance and iron losses, improving the motor's efficiency and performance.

[0022] In specific implementation of this utility model: the rotor teeth 9 with the stepped profile structure are tightly meshed with the permanent magnet mounting groove 8 with the T-shaped structure, and the side walls of the two are in contact with each other, which strengthens the structural connection between the permanent magnet mounting groove 8 and the rotor teeth 9, optimizes the air gap magnetic flux distribution, thereby reducing the air gap magnetic resistance and avoiding the situation where the excitation current increases and the power factor decreases due to the increase in magnetic resistance.

[0023] It is worth noting that in the description of this utility model, "multiple" means two or more, unless otherwise explicitly specified. In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can also refer to a mechanical connection. The circuits described in this utility model are all commonly used circuits in the art, and other related components are all commonly used existing components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0024] It will be apparent to those skilled in the art that this utility model patent is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this utility model patent. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this utility model patent is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be encompassed within this utility model patent. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A stator permanent magnet motor capable of reducing air gap magnetic reluctance, characterized in that, include: The stator assembly includes an annular stator core and a plurality of stator teeth evenly distributed along its circumference. The outer surfaces of the plurality of stator teeth are provided with axially extending permanent magnet mounting grooves, and permanent magnets are embedded in the grooves to form a multipole magnetic field. The rotor assembly includes a coaxially arranged rotor core, whose outer circumferential surface is provided with rotor teeth that are staggered and correspond to the stator teeth, forming an asymmetrical tooth groove structure. The permanent magnet mounting slot is formed on the top of the stator teeth. The permanent magnet mounting slot has a T-shaped structure. The rotor teeth adopt a stepped contour structure and mesh with the T-shaped permanent magnet mounting slot to reduce air gap magnetic resistance.

2. A stator permanent magnet motor with reduced air gap magnetic reluctance according to claim 1, characterized in that, It also includes a stator winding mechanism, comprising a multiphase armature winding wound in a permanent magnet mounting slot.

3. A stator permanent magnet motor with reduced air gap magnetic reluctance according to claim 2, characterized in that, It also includes a rotor winding mechanism, which comprises independently configured induction windings and excitation windings.

4. A stator permanent magnet motor with reduced air gap magnetic reluctance according to claim 3, characterized in that, The number of pole pairs of the induction winding is the same as the number of poles of the permanent magnet, and it is wound in the first set of slots of the rotor teeth; the number of pole pairs of the excitation winding is the same as that of the armature winding, and it is wound in the second set of slots of the rotor teeth; the two sets of windings are connected by a bridging wire to form a star or delta electrical connection.

5. A stator permanent magnet motor with reduced air gap magnetic reluctance according to claim 1, characterized in that, The permanent magnets are surface-mounted, and their magnetization direction is arranged alternately in a radial direction, with adjacent permanent magnets having opposite polarities.

6. A stator permanent magnet motor with reduced air gap magnetic reluctance according to claim 1, characterized in that, The stator core and rotor core are constructed by laminating high-permeability materials, with the lamination direction parallel to the motor axis.

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