Armature enhanced modular stator vernier permanent magnet motor

Abstract

The invention discloses an armature-enhanced modular stator vernier permanent magnet motor, which belongs to the field of motors, applies a stator magnetic barrier to a vernier permanent magnet motor as a modulation unit of an armature winding, breaks the original understanding of the magnetic barrier through physical concepts, and can enhance the interlinking capability of the armature winding to an excitation magnetic field. Meanwhile, the magnetomotive force of a plurality of working armatures of the vernier permanent magnet motor is enhanced, so that the torque density of the motor is increased; moreover, the first stator teeth adopt a split tooth structure, so that the length of the end part of the winding is shortened, and the size of the motor is reduced; in addition, the magnetic barrier shape in which the width of the air gap side is larger than that of the non-air-gap side is adopted, so that the area of the first stator slot can be increased and more windings can be placed under the condition that the air gap structure is not influenced, and the torque density of the motor is further improved.

Description

Technical Field

[0001] The invention belongs to the field of motors, and more specifically, relates to an armature-enhanced modular stator vernier permanent magnet motor. Background Art

[0002] The vernier permanent magnet motor has received extensive attention in the academic community for its inherent high torque density, low torque pulsation, high sinusoidal degree of no-load back EMF and other characteristics, and has broad prospects for industrial application. Compared with traditional permanent magnet motors, the vernier permanent magnet motor can generate multiple working harmonics through the magnetic field modulation effect, which work together to produce average torque. However, the armature winding of the vernier permanent magnet motor does not fully utilize the working harmonics, and the torque output capacity still has room for improvement.

[0003] Stator magnetic barriers are usually used as a means to weaken low-order magnetic flux harmonics and improve motor efficiency, but at the same time they will weaken the motor's operating magnetic flux harmonics, resulting in the sacrifice of the motor's torque density, which refers to the torque that the motor can generate per unit volume. From a physical point of view, it is generally believed that stator magnetic barriers interrupt the path of low-order magnetic flux, forcing the low-order magnetic flux lines to pass through the air gap multiple times, increasing the magnetic resistance, and thus suppressing the low-order magnetic flux. Summary of the invention

[0004] In view of the above defects or improvement needs of the prior art, the present invention provides an armature-enhanced modular stator vernier permanent magnet motor, which can improve the cross-linkage ability of the armature winding pair with the excitation magnetic field, and improve the torque density of the vernier permanent magnet motor without increasing the electrical load.

[0005] To achieve the above object, the present invention provides an armature-enhanced modular stator vernier permanent magnet motor, comprising: a coaxially sleeved stator assembly and a rotor assembly, with an air gap between the stator assembly and the rotor assembly;

[0006] The stator assembly includes a stator core and an armature winding; the stator core includes a plurality of stator modules distributed in a ring shape, and gaps are left between the stator modules to form a stator magnetic barrier; when the stator magnetic barriers are completely filled, the stator core is cylindrical as a whole;

[0007] The stator module includes a stator yoke, a first stator tooth and a second stator tooth; the first stator tooth and the second stator tooth are respectively arranged at the middle and both ends of the stator yoke, and a first stator slot is provided between the first stator tooth and the second stator tooth for placing an armature winding; the first stator tooth includes a main tooth and two split teeth, and a second stator slot is provided between the two split teeth; the width of the stator magnetic barrier close to the stator yoke is smaller than the width close to the air gap;

[0008] The second stator teeth are used to wind the coils of the armature winding, and the two ends of the coils are respectively wound on the adjacent second stator teeth of the adjacent stator modules, and the central axis of the coil after winding coincides with the central axis of the stator magnetic barrier between the adjacent stator modules; wherein the number of the stator modules and the number of the coils of the armature winding are both N, and N is a multiple of the number of winding phases;

[0009] The rotor assembly comprises a rotor core and permanent magnets. The rotor core is in a ring shape, and the permanent magnets are distributed in a ring shape on the air gap side of the rotor core.

[0010] In general, the above technical solutions conceived by the present invention can achieve the following beneficial effects compared with the prior art:

[0011] The armature-enhanced modular stator vernier permanent magnet motor provided by the present invention applies a stator magnetic barrier to the vernier permanent magnet motor, and uses the stator magnetic barrier as a modulation unit of the armature winding, breaking the original understanding of the magnetic barrier through physical concepts. The stator magnetic barrier can enhance the cross-linkage ability of the armature winding to the excitation magnetic field, and at the same time enhance the magnetomotive force of multiple working armatures of the vernier permanent magnet motor, thereby increasing the torque density of the motor; and the first stator tooth adopts a split tooth structure, which shortens the end length of the winding and reduces the volume of the motor; in addition, a magnetic barrier shape with an air gap side width greater than a non-air gap side width is adopted, which can increase the area of ​​the first stator slot without affecting the air gap structure, thereby placing more windings and further improving the torque density of the motor.

[0012] As a further preference, the armature-enhanced modular stator vernier permanent magnet motor provided by the present invention has different widths of the first stator slot, the second stator slot and the air gap side of the stator magnetic barrier, forming an unevenly distributed air gap structure, generating multiple air gap permeability harmonics. The rotor excitation magnetic field is modulated by the magnetic field of the uneven air gap, generating multiple working harmonics that interlink with the armature winding, and work together to generate an average torque, thereby further improving the torque density of the motor.

[0013] As a further preference, the armature-enhanced modular stator vernier permanent magnet motor provided by the present invention has a first stator slot adopting a semi-open slot structure. Compared with the straight-tooth open slot structure adopted by the stator slots of conventional vernier permanent magnet motors, the slot opening is smaller, which can increase the slot coefficient of the armature winding, further enhance the ability of the armature winding to cross-link the excitation magnetic field, and improve the torque density of the motor.

[0014] As a further preference, in the armature-enhanced modular stator vernier permanent magnet motor provided by the present invention, the width of the first stator slot close to the stator yoke side is greater than the width close to the air gap side, which can increase the area of ​​the first stator slot, thereby accommodating more windings and further improving the torque density of the motor.

[0015] As a further preference, in the armature-enhanced modular stator vernier permanent magnet motor provided by the present invention, in the cross-section of the stator module, the second stator slot is a triangular arch, which can minimize the occupied space while ensuring that the air gap magnetic permeability is not affected, thereby increasing the area of ​​the first stator slot, thereby accommodating more windings and further improving the torque density of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of the overall structure of an outer stator and inner rotor armature enhanced modular stator vernier permanent magnet motor provided in an embodiment of the present invention.

[0017] Figure 2 Schematic diagram of the overall structure of the outer rotor inner stator armature enhanced modular stator vernier permanent magnet motor provided in an embodiment of the present invention.

[0018] Figure 3 A schematic diagram of the stator structure of an armature-enhanced modular stator vernier permanent magnet motor provided in an embodiment of the present invention.

[0019] Figure 4 A cross-sectional view of a stator module of an armature-enhanced modular stator vernier permanent magnet motor provided in an embodiment of the present invention.

[0020] Figure 5 A schematic diagram of the rotor structure of an armature-enhanced modular stator vernier permanent magnet motor provided in an embodiment of the present invention.

[0021] In all drawings, the same reference numerals are used to denote the same elements or structures, wherein:

[0022] 1 is the stator, 2 is the rotor, 3 is the stator core, 4 is the armature winding, 5 is the stator magnetic barrier, 6 is the first stator slot, 7 is the second stator slot, 8 is the first stator tooth, 9 is the second stator tooth, 10 is the main tooth, 11 is the split tooth, 12 is the rotor core, and 13 is the rotor permanent magnet. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0024] The embodiment of the present invention provides an armature-enhanced modular stator vernier permanent magnet motor, comprising: a stator assembly 1 and a rotor assembly 2 which are coaxially sleeved, and an air gap is provided between the stator assembly 1 and the rotor assembly 2;

[0025] The stator assembly 1 includes a stator core 3 and an armature winding 4; the stator core 3 includes a plurality of stator modules distributed in a ring shape, and gaps are left between the stator modules to form a stator magnetic barrier 5; when the stator magnetic barriers 5 are completely filled, the stator core 3 is cylindrical as a whole;

[0026] The stator module includes a stator yoke, a first stator tooth 8 and a second stator tooth 9; the first stator tooth 8 and the second stator tooth 9 are respectively arranged at the middle and both ends of the stator yoke, and a first stator slot 6 is provided between the first stator tooth 8 and the second stator tooth 9 for placing an armature winding 4; the first stator tooth 8 includes a main tooth 10 and two split teeth 11, and a second stator slot 7 is provided between the two split teeth 11; the width of the stator magnetic barrier 5 close to the stator yoke is smaller than the width close to the air gap;

[0027] The second stator teeth 9 are used to wind the coils of the armature winding 4, and the two ends of the coils are respectively wound on the adjacent second stator teeth 9 of the adjacent stator modules, and the central axis of the coil after winding coincides with the central axis of the stator magnetic barrier between the adjacent stator modules; wherein the number of the stator modules and the number of coils of the armature winding 4 are both N, and N is a multiple of the number of winding phases;

[0028] The rotor assembly 2 includes a rotor core 12 and permanent magnets 13 . The rotor core 12 is annular, and the permanent magnets 13 are distributed in an annular shape on the air gap side of the rotor core 12 .

[0029] The motor provided in the embodiment of the present invention can be Figure 1 The outer rotor inner stator motor shown can also be Figure 2 The motor with outer stator and inner rotor is shown.

[0030] The motor provided by the embodiment of the present invention is further described below by taking an outer rotor inner stator motor, a winding phase number of 3, and N=6 as an example.

[0031] like Figure 1 , 3 As shown, the motor provided by the embodiment of the present invention includes a stator assembly 1 and a rotor assembly 2 which are coaxially sleeved, and there is an air gap between the stator assembly 1 and the rotor assembly 2.

[0032] The stator assembly 1 includes a stator core 3 and an armature winding 4;

[0033] The stator core includes a plurality of stator modules, and gaps are provided between adjacent stator modules to form a stator magnetic barrier 5, thereby dividing the stator core 3 into 6 even sections to form 6 modular stators, which play a role in enhancing the working armature magnetomotive force. It can be understood that the specific value of N is determined by the number of excitation pole pairs and the coil span, as well as the space utilization rate of the stator core, and can be selected according to actual needs.

[0034] In this example, a total of 6 stator magnetic barriers 5 are provided, and the stator core 3 is evenly cut into 6 sections to form a modular stator, which plays a role in modulating the yoke magnetic circuit, enhancing the cross-linking ability of the armature winding 4 to the excitation magnetic field, and enhancing the working armature magnetomotive force.

[0035] When the magnetic barrier 5 is completely filled with non-magnetic conductive material, the stator core is cylindrical as a whole, and a groove is opened on one side of the cylinder wall to form a first stator slot 6 and a second stator slot 7. The first stator slot 6 serves to place the armature winding 4, and the second stator slot 7 serves to modulate the magnetic field; the stator core includes a first stator tooth 8 and a second stator tooth 9, wherein the first stator tooth 8 is composed of a main tooth 10 and two split teeth 11, and each split tooth has the same shape and size. The second stator tooth 9 contains only one main tooth, which serves to wind the winding coil. The first and second stator teeth and the first and second stator slots on the air gap side all serve to modulate the magnetic field, and the second stator tooth 9 also serves to wind the armature winding.

[0036] The armature winding 4 is a concentrated winding with a span of 1. The winding comprises N coils in total, each coil spanning two adjacent second stator teeth 9 of two adjacent stator modules and the stator magnetic barrier 5 between the two stator modules, and the central axis of the winding coincides with the central axis of the stator magnetic barrier 5 .

[0037] Preferably, if Figure 3 As shown, the stator magnetic barrier 5 is narrower on the yoke side (i.e., the stator yoke) and wider on the air gap side. This can shorten the width of the stator magnetic barrier yoke while ensuring that the air gap magnetic field modulation effect remains unchanged, thereby increasing the stator slot area.

[0038] Preferably, the slot width of the first stator slot 5 and the slot width of the second stator slot 7 are different from the air gap side width of the stator magnetic barrier 5, which increases the number of magnetic permeance harmonics, thereby generating more working harmonics and improving torque density.

[0039] The harmonic action of the magnetic field and the air gap magnetic permeability generates multiple working magnetic flux densities, which contribute to the torque synergistically, thereby achieving an increase in torque density.

[0040] The first stator slot 6 serves to house the armature winding 4 .

[0041] Preferably, the first stator slot 6 adopts a semi-open slot structure, which not only achieves a modulation effect but also increases the slot coefficient of the motor, thereby increasing the magnetomotive force of the working armature.

[0042] Preferably, the width of the first stator slot 6 close to the stator yoke is greater than the width close to the air gap, which serves to increase the slot area.

[0043] The second stator slot 7 does not contain the armature winding but only plays the role of magnetic field modulation.

[0044] Specifically, Figure 4 As shown, in the cross section of the stator module, the second stator slot 7 is in a triangular arch shape, the purpose of which is to reduce the occupied space as much as possible while ensuring that the air gap magnetic permeability is not affected, thereby increasing the area of ​​the first stator slot 6.

[0045] The rotor assembly 2 includes a rotor core 12 and a permanent magnet 13. Figure 5 The rotor core 12 is annular (e.g., annular silicon steel sheets), and multiple pairs of permanent magnets 13 are evenly distributed near the air gap side (the embodiment of the present invention takes 19 pairs of permanent magnets and a tile shape as an example). The magnetization direction of the permanent magnets 13 is radial magnetization, and the magnetization direction is alternately arranged inside and outside.

[0046] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is 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. An armature-enhanced modular stator vernier permanent magnet motor, characterized in that: include: A stator assembly (1) and a rotor assembly (2) are coaxially sleeved, and an air gap is provided between the stator assembly (1) and the rotor assembly (2); The stator assembly (1) comprises a stator core (3) and an armature winding (4); the stator core (3) comprises a plurality of stator modules distributed in a ring shape, and gaps are left between the stator modules to form stator magnetic barriers (5); when the stator magnetic barriers (5) are completely filled, the stator core (3) is cylindrical as a whole; The stator module comprises a stator yoke, a first stator tooth (8) and a second stator tooth (9); the first stator tooth (8) and the second stator tooth (9) are respectively arranged at the middle and two ends of the stator yoke, and a first stator slot (6) is provided between the first stator tooth (8) and the second stator tooth (9) for accommodating an armature winding (4); the first stator tooth (8) comprises a main tooth (10) and two split teeth (11), and a second stator slot (7) is provided between the two split teeth (11); the width of the stator magnetic barrier (5) close to the stator yoke is smaller than the width close to the air gap; The second stator teeth (9) are used to wind the coils of the armature winding (4), and the two ends of the coils are respectively wound on adjacent second stator teeth (9) of adjacent stator modules, and after winding, the central axis of the coil coincides with the central axis of the stator magnetic barrier between the adjacent stator modules; wherein the number of the stator modules and the number of coils of the armature winding (4) are both N, and N is a multiple of the number of winding phases; The rotor assembly (2) comprises a rotor core (12) and permanent magnets (13); the rotor core (12) is annular; and the permanent magnets (13) are distributed in an annular shape on the air gap side of the rotor core (12).

2. The motor according to claim 1, characterized in that The air gap side widths of the first stator slot (6), the second stator slot (7) and the stator magnetic barrier (5) are all different.

3. The motor according to claim 1, characterized in that The first stator slot (6) is a semi-open slot structure.

4. The motor according to claim 1, characterized in that The width of the first stator slot (6) close to the stator yoke is greater than the width close to the air gap.

5. The motor according to claim 1, characterized in that In the cross section of the stator module, the second stator slot (7) is in a triangular arch shape.

6. The motor according to claim 1, characterized in that The armature winding (4) is a concentrated winding.

7. The motor according to claim 1, characterized in that The motor is an outer rotor inner stator motor or an outer stator inner rotor motor.

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