Alternating pole vernier permanent magnet motor based on harmonic modified rotor and barrier magnetized stator

Abstract

The present application belongs to the technical field of motor design, and more particularly relates to an alternating pole vernier permanent magnet motor based on a harmonic modified rotor and a magnetic barrier stator. Specifically, it comprises a rotor and a stator, the rotor is coaxially arranged in the stator, the pole of the rotor core adopts a harmonic modified directional design, the air gap permeance distribution is optimized to suppress non-working harmonics, and at the same time, the inter-pole leakage is reduced and the permanent magnet flux density fundamental amplitude is improved; and the magnetic barrier embedded in the stator tooth is used to block the low-order non-working harmonic path in the armature flux density, so as to weaken the amplitude. The present application solves the problem that the current motor simply applies the Halbach permanent magnet array to only realize the enhancement of working harmonics, ignores the non-working harmonics existing in the air gap, and fails to realize the full utilization of permanent magnets, resulting in the problems of low torque density and high manufacturing cost of the current alternating pole vernier permanent magnet motor.

Description

Technical Field

[0001] This invention belongs to the technical field of motor design, and more specifically, relates to an alternating pole vernier permanent magnet motor based on a harmonic-modified rotor and a stator with magnetic barriers. Background Technology

[0002] Vernier permanent magnet motors (PVMs) have significant application prospects in direct-drive wind power generation and ship propulsion due to their high torque density. However, these motors typically require a large amount of permanent magnet material, resulting in high costs and hindering their widespread adoption. Therefore, reducing the amount of permanent magnets used while maintaining high torque density has become a current research hotspot. Alternating pole vernier PVMs replace half of the permanent magnet poles with iron core poles, which can reduce the amount of permanent magnets used to some extent. Furthermore, due to the high permeability of the iron core poles, the torque output does not decrease proportionally, thus improving the torque capability per unit amount of permanent magnets. However, due to severe inter-pole leakage magnetic field problems, the torque density of these motors is usually lower than that of traditional vernier PVMs. Existing technologies often employ Halbach permanent magnet arrays to suppress inter-pole leakage magnetic field, thereby improving their torque performance.

[0003] Chinese invention patent CN118889734A discloses a high-torque alternating pole permanent magnet motor. By setting the outer circumferential surface of the air gap corresponding to the permanent magnet assembly and rotor teeth as a continuous circumferential undulating surface structure, the magnetic flux density harmonic content of the air gap is increased. In the alternating pole permanent magnet motor, the interaction between radial and tangential magnetic flux density harmonics of the same order generates average torque, further increasing the average torque of the alternating pole permanent magnet motor. Chinese invention patent CN109861413A discloses a magnetizing alternating pole fault-tolerant permanent magnet vernier motor, including a rotor and a stator. The rotor consists of two rotors that are 180° apart. The rotor consists of two identical sub-rotors (with unequal axial lengths) and a non-magnetic rotor ring. This rotor ring is located between the two sub-rotors, with a non-magnetic cylinder embedded between the yoke and bearing of one of the sub-rotors. The stator comprises two identical sub-stators and a non-magnetic stator ring. The stator ring and the two sub-stators have the same shape and are located between them. Halbach permanent magnet arrays are embedded on the surfaces of the two sub-rotors, but their main excitation directions are opposite. Armature teeth and fault-tolerant teeth are evenly distributed alternately along the circumference, while modulation teeth are unevenly distributed on the spatial circumference. All of these methods utilize Halbach permanent magnet arrays to improve the leakage flux problem of alternating pole rotors, effectively increasing the output torque.

[0004] However, according to magnetic field modulation theory, improving motor torque performance depends on the effective utilization of the working harmonics of the air gap magnetic field and the suppression of non-working harmonics. However, simply applying a Halbach permanent magnet array only enhances the working harmonics, neglecting the non-working harmonics present in the air gap, thus failing to fully utilize the permanent magnets. Furthermore, the Halbach permanent magnet array process is complex and expensive, weakening the low-cost advantage of alternating pole vernier permanent magnet motors and hindering their widespread application. Therefore, how to enhance the working harmonics and weaken the non-working harmonics through specific design to achieve full utilization of the permanent magnets, thereby maintaining the low-cost advantage while improving torque density, is of great significance for expanding the application range of alternating pole vernier permanent magnet motors. Summary of the Invention

[0005] The present invention aims to overcome at least one of the defects of the prior art and provide an alternating pole vernier permanent magnet motor based on a harmonic-modified rotor and a stator with magnetic barriers. This solves the problem that the existing motors simply apply Halbach permanent magnet arrays, which only enhance the working harmonics and ignore the non-working harmonics in the air gap, thus failing to fully utilize the permanent magnets and resulting in low torque density and high manufacturing cost of the current alternating pole vernier permanent magnet motor.

[0006] The detailed technical solution of this invention is as follows: An alternating pole vernier permanent magnet motor based on a harmonic-modified rotor and a magnetic barrier stator includes a rotor and a stator, wherein the rotor is coaxially sleeved inside the stator and an air gap is provided between the rotor and the stator. The rotor includes: a plurality of rotor permanent magnets and a rotor core that are uniformly spaced along the circumferential direction and magnetized in the same direction; the rotating shaft passes through the central hole of the rotor core and is fixed thereto. The rotor core includes: rotor core poles and rotor yoke, and the rotor core poles adopt a harmonic-modified orientation design; The stator includes: stator teeth, stator yoke and armature winding, with magnetic barriers embedded between the stator teeth, and a core bridge connected at the tip of the stator teeth with magnetic barriers.

[0007] Furthermore, the rotor core poles adopt a harmonic-modified orientation design, specifically including: The circumference of a single rotor core is , From radial thickness The arc-shaped base and the outline shape are Composed of an arc-shaped top, The design is as follows:

[0008] in, The outer radius of the rotor yoke; The maximum radial thickness of the arc-shaped top must satisfy... , The radial thickness of the rotor permanent magnet is the maximum radial thickness of the rotor core pole. , b , c These are the amplitudes of the fundamental wave, the third harmonic, and the fifth harmonic, respectively. Half the motor pole pitch With the polar arc of a single rotor core The ratio is ; is the number of pole pairs of the rotor permanent magnet; The rotor core pole number. ; The radius of curvature along the circumference with the center of the rotation axis as the origin, for each of the aforementioned serial numbers , The range of values ​​is limited to .

[0009] Furthermore, the rotor core's arc-shaped top profile shape Amplitude of the fundamental frequency, third and fifth harmonics , b , c Satisfy the set constraints:

[0010] The range of values By substituting multiple discrete values ​​of the same n into the constraints, and solving the system of equations, the constraint conditions can be obtained. , b , c value.

[0011] Furthermore, the permanent magnet is radially magnetized, with the magnetization direction radially outward, and the number of pole pairs is... P r Its radial thickness is 14. 3mm; permanent magnet pole arc coefficient ,in The circumference of a single permanent magnet, the motor pole pitch , It is an extreme logarithm.

[0012] Furthermore, the stator teeth adopt a straight tooth design, with a total number of Z teeth. s And a width of [missing information] is set every other stator tooth. w g The magnetic barrier, the tips of the stator teeth with the magnetic barrier are made of a thickness of w i The iron core bridge connects them.

[0013] Furthermore, the armature winding is a single-layer fractional-slot concentrated winding with a pole pair number of P a satisfy P a + P r = Z s .

[0014] The width w of the magnetic barrier g =1.3mm, the thickness w of the core bridge i =0.5mm.

[0015] The number of pole pairs P of the rotor permanent magnet r =14, Total number of stator teeth Z s =24, armature winding pole pairs P a =10.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) The present invention provides an alternating pole vernier permanent magnet motor based on a harmonic-modified rotor and a stator with magnetic barriers. The rotor core pole adopts a harmonic-modified orientation design. By optimizing the magnetic permeability distribution, non-working harmonics are effectively suppressed. At the same time, the leakage magnetic flux between the alternating pole rotor poles is reduced, and the amplitude of the permanent magnet magnetic flux density is increased, thereby improving the torque density. In addition, the permanent magnet adopts ordinary radial magnetization, avoiding the complex Halbach permanent magnet array, which reduces the motor cost while ensuring high torque density.

[0017] (2) The present invention provides an alternating pole vernier permanent magnet motor based on a harmonic-modified rotor and a stator with magnetic barriers. The stator adopts a segmented design and the stator teeth are embedded with magnetic barriers, which effectively blocks the low-order non-working harmonic path of the armature magnetic flux density and weakens its amplitude, thereby improving the torque quality of the motor.

[0018] (3) The present invention provides an alternating pole vernier permanent magnet motor based on a harmonic-modified rotor and a stator with magnetic barriers. Through the synergistic effect of the rotor core pole harmonic-modified orientation design and the stator magnetic barrier structure, the working harmonics are enhanced and the non-working harmonics are suppressed. This effectively improves the motor power factor while increasing the motor torque density. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the alternating pole vernier permanent magnet motor structure based on a harmonic-modified rotor and a stator with magnetic barriers, as described in this invention.

[0020] Figure 2 This is a rotor structure diagram of Embodiment 1 of the present invention.

[0021] Figure 3 This is a stator structure diagram in Embodiment 1 of the present invention.

[0022] Figure 4 This is a partial enlarged view of the rotor core in Embodiment 1 of the present invention.

[0023] Figure 5 This is a partial enlarged view of the stator in Embodiment 1 of the present invention.

[0024] Figure 6 The waveform diagrams are of the main non-working harmonic torque of Embodiment 1 of the present invention and the comparative motor.

[0025] Figure 7 This is a comparison diagram of the air gap magnetic flux density harmonics of Embodiment 1 of the present invention and the comparative motor 1 in the harmonic order range of 0-50.

[0026] Figure 8 This is a comparison diagram of the air gap magnetic flux density harmonics of Embodiment 1 of the present invention and the comparative motor 1 in the harmonic order range of 50-100.

[0027] Figure 9 This is a comparison diagram of the peak-to-peak value of the non-working harmonic torque of Embodiment 1 of the present invention and a comparative motor.

[0028] Figure 10 This is a comparison diagram of the main harmonic amplitudes of the armature magnetic flux density of Comparative Motor 2 and Comparative Motor 1 in Embodiment 1 of the present invention.

[0029] Figure 11 This is a comparison diagram of the three no-load back EMFs of Embodiment 1 of the present invention and the comparative motor.

[0030] Figure 12 This is a comparison diagram of the harmonic amplitudes of the three no-load back EMFs of the motor in Embodiment 1 of the present invention.

[0031] Figure 13 This is a comparison diagram of the three output torques of the comparative motor in Embodiment 1 of the present invention.

[0032] Figure label: 1. Rotor; 11. Permanent magnet; 12. Rotor core; 121. Rotor core pole; 122. Rotor yoke; 2. Stator; 21. Stator tooth; 22. Stator yoke; 23. Armature winding; 211. Magnetic barrier; 212. Core bridge. 3. Air gap. Detailed Implementation

[0033] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0034] It should be noted that the following detailed descriptions are exemplary and intended to provide further illustration of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0035] It should be noted that the terminology used herein is only for describing specific embodiments, and is not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0036] Embodiments of the present invention and features in the embodiments can be combined with each other without conflict.

[0037] Example 1 Referring Figure 1 , the present embodiment provides an alternating-pole vernier permanent magnet motor based on a harmonic-shaped rotor and a stator with magnetic barriers. Specifically, taking a three-phase inner-rotor alternating-pole vernier permanent magnet motor as an example, the motor includes a rotor 1 and a stator 2, the rotor 1 is coaxially sleeved inside the stator 2, and an air gap is provided between the rotor 1 and the stator 2.

[0038] Specifically, the rotor 1 includes: a plurality of rotor permanent magnets 11 magnetized in the same direction and a rotor core 12 which are evenly embedded at intervals along the circumferential direction, a rotating shaft passes through and is fixed to the central hole of the rotor core 12, as Figure 2 shown; Preferably, the permanent magnets 11 in this embodiment are radially magnetized, the magnetization direction is radially outward, and the number of pole pairs is 14, and its radial thickness is 3 mm; the pole arc coefficient of the permanent magnet 11 , wherein is the circumferential radian of a single permanent magnet 11, and the motor pole pitch , in this embodiment, the pole arc coefficient α is 0.55.

[0039] Specifically, the rotor core 12 includes: a rotor core pole 121 and a rotor yoke 122, as Figure 4 shown; in this embodiment, the rotor core pole 121 adopts a directional harmonic shaping design, let the circumferential radian of a single rotor core pole 121 be , it is composed of an arc-shaped base with a radial thickness of and an arc-shaped top with a contour shape of , wherein is designed as follows:

[0040] wherein, is the outer peripheral radius of the rotor yoke 122; is the maximum radial thickness of the arc-shaped top, satisfying , The radial thickness of the rotor permanent magnet 11 is the same as the maximum radial thickness of the rotor core pole 121; the two are equal. Figure 4 As shown; , b , c These are the amplitudes of the fundamental wave, the third harmonic, and the fifth harmonic, respectively. Half polar moment With a single rotor core pole of 121 radians The ratio is ; P r denoted as the number of pole pairs of rotor permanent magnet 11; The rotor core pole number is 121. ; The radius of curvature along the circumference with the center of the rotation axis as the origin, for each of the aforementioned serial numbers , The range of values ​​is limited to One n corresponds to one contour shape. The shape function of the arc-shaped top, for example: is the iron core pole at the center of the shaft, where n=0, and when n=1, the offset is 2. / Pr, and you'll reach the second iron core pole.

[0041] Preferably, in this specific embodiment, the outer circumference radius of the rotor yoke 122 is... The radial thickness Δ of the arc-shaped base is 39mm. t It is 0.7mm, by The maximum radial thickness of the arc-shaped top can be obtained. It is 2.3mm; composed of a permanent magnet with an 11-pole arc coefficient. The circumferential arc of a single rotor core pole can be obtained as 121. And then calculate , The value range is [-0.9]. / 28,0.9 / 28].

[0042] Specifically, the arc-shaped top profile of the rotor core pole 121 Amplitude of the fundamental frequency, third and fifth harmonics , b , c The following constraints must be met:

[0043] In this specific embodiment, in Multiple discrete values ​​are selected within the range [-0.9π / 28, 0.9π / 28] and substituted into the constraints to determine the conditions that simultaneously make all the equations in the formula true. After the value is determined, the joint system is established. The system of equations formed by substituting the values ​​can then be solved. , b , c Value. Determined through solution. =1.172, b =0.1954, c =0.02344.

[0044] In this invention, the rotor core pole 121 adopts a harmonic-modified orientation design. By optimizing the magnetic permeability distribution, non-working harmonics are effectively suppressed, while the leakage flux between alternating pole rotor poles is reduced, and the amplitude of the permanent magnet magnetic flux density fundamental wave is increased, thereby achieving an improvement in torque density. In addition, the permanent magnet 11 adopts ordinary radial magnetization, avoiding the complex Halbach permanent magnet array, which reduces the cost of the motor while ensuring high torque density.

[0045] Specifically, the stator 2 includes stator teeth 21, a stator yoke 22, and an armature winding 23, such as... Figure 3 As shown. In this specific embodiment, the stator teeth 21 adopt a straight tooth design, with a total number of teeth Z. s The value is 24, and a width of is set every other stator tooth. w g The magnetic barrier 211, the tooth tip of the stator tooth 21 with the magnetic barrier 211 is made of a thickness of w i The core bridge 212 is connected; preferably, the stator teeth of the unwound armature winding are provided with a width of w g The magnetic barrier 211 is provided, and the stator teeth 21 with the magnetic barrier 211 and the stator teeth 21 with the armature winding 23 are arranged alternately. The armature winding 23 is a single-layer fractional-slot concentrated winding with a pole pair number of P a satisfy P a + P r = Z s Thus, the number of winding pole pairs is obtained. P a =10.

[0046] Furthermore, the stator tooth 21 with the aforementioned magnetic barrier 211 includes the magnetic barrier 211 and the core bridge 212, such as... Figure 5 As shown. The magnetic barrier 211 is used to block the path of low-order non-operating harmonics in the armature winding and weaken their amplitude. In this specific embodiment, the width of the magnetic barrier 211 is... w g The thickness is set at 1.3mm. Meanwhile, to facilitate processing and reduce manufacturing costs, the thickness of the 212 core bridge is... w iTake 0.5mm.

[0047] While the present invention suppresses high-order non-working harmonics at the source when using rotor core polar harmonic modification, it changes the air gap magnetic reluctance, resulting in an overall attenuation of armature magnetic flux density. However, by combining the stator magnetic barrier 211 structure (which adopts a segmented design with magnetic barriers 211 embedded between stator teeth 21), the path of low-order non-working harmonics in the armature magnetic flux density is effectively blocked while its amplitude is weakened, thereby improving the torque quality of the motor.

[0048] In summary, through the synergistic effect of the rotor core pole 121 harmonic shaping and orientation design and the stator magnetic barrier 211 structure, the enhancement of working harmonics and the suppression of non-working harmonics are achieved, which effectively improves the motor power factor while increasing the motor torque density.

[0049] To investigate the key harmonic components affecting motor torque, a comparison motor was set up. This comparison motor had the same dimensional parameters as the motor described in Embodiment 1 of this invention, except that it adopted a conventional alternating pole rotor structure and the stator did not have a magnetic barrier 211. Then, the electromagnetic torque of the comparison motor was decomposed using the Maxwell stress tensor method to obtain the waveforms of the first five non-working harmonic torques that only contributed to the torque pulsation. The horizontal axis represents the rotor position angle, and the vertical axis represents the torque. Figure 6 As shown, the main non-operating harmonics in the comparison motor are high-order harmonics such as 70, 98, 42, 82, and 84.

[0050] According to the magnetic field modulation theory, the generation of the above-mentioned non-working harmonics is closely related to the even-order harmonic components of the rotor 1 magnetic flux: for example, the interaction between the permanent magnet magnetic flux density fundamental component and the fourth-order component of the rotor 1 magnetic flux generates 70 pairs of pole harmonics, and the interaction between the permanent magnet magnetic flux density fundamental component and the sixth-order component of the rotor 1 magnetic flux generates 98 pairs of pole harmonics.

[0051] Firstly, to verify the optimization effect of the present invention on the magnetic permeability distribution of rotor 1, the air gap magnetic flux density harmonic amplitude of the motor described in this embodiment 1 and the comparative motor 1 in the harmonic order range of 1-100 were compared, and the results are as follows. Figure 7 and Figure 8 As shown, the amplitudes of the 42nd, 70th, 82nd, 84th, and 98th harmonics of the motor described in this embodiment 1 have been effectively reduced.

[0052] Secondly, the peak value of the non-working harmonic torque of the motor described in Embodiment 1 is further compared with that of the comparative motor 1. The results are as follows: Figure 9 As shown in the figure, the amplitude of the high-order non-working harmonic torque of the motor described in Embodiment 1 is significantly lower than that of the comparative motor 1, with a reduction of more than 60%. This indicates that the present invention effectively weakens the even-order harmonic components in the magnetic permeability of rotor 1 by means of the harmonic shaping and orientation design of rotor core pole 121, thereby suppressing high-order non-working harmonics at the source and improving harmonic utilization.

[0053] Thirdly, it should be noted that the rotor core pole 121 harmonic shaping and the stator magnetic barrier 211 structure used in this invention are not simply superimposed on existing technologies; there is a deep synergy between the two. Vernier permanent magnet motors have richer armature harmonics than permanent magnet synchronous motors, including many low-order non-operating harmonics. These harmonics cannot couple with permanent magnet flux density harmonics to contribute torque, and their amplitudes are often high, leading to additional losses and reduced motor efficiency.

[0054] Regarding the pole-slot arrangement of the motor described in Embodiment 1, the armature non-working harmonics with the largest amplitude are the second pair of pole harmonics. A motor using a conventional stator and employing only the rotor core pole 121 harmonic shaping method described in this invention is defined as Comparative Motor Two. Based on Comparative Motor One, although Comparative Motor Two can suppress high-order non-working harmonics at the source through rotor core pole 121 harmonic shaping design as described above, it alters the air gap reluctance, leading to an overall attenuation of the armature magnetic flux density. For example... Figure 10 As shown, compared to the first comparison motor, although the amplitude of the largest two pairs of non-working harmonics in the second comparison motor decreased by 30%, the amplitude of the 14 pairs of working harmonics also decreased by 43%.

[0055] Building upon this, this embodiment further introduces a stator alternating magnetic barrier 211 structure, resulting in a synergistic effect. Figure 10 Furthermore, it can be seen that: compared to the second comparative motor, the stator magnetic barrier 211 structure in the motor described in this embodiment 1 increases the amplitude reduction of the two pairs of non-working harmonics from 30% to 46%; simultaneously, this structure shortens the magnetic circuit of the 14 pairs of working harmonics, producing a magnetic focusing effect, narrowing its amplitude reduction from 43% to 41%, and curbing the attenuation of working harmonics. This asymmetric optimization effect of "significantly suppressing non-working harmonics and minimizing working harmonic losses" cannot be achieved by a single technical solution. The combination of the two overcomes the conventional limitations of independent rotor and stator design, achieving unexpected technical results.

[0056] Fourthly, to further verify the comprehensive performance advantages of the present invention, the third comparative motor is defined as a motor with a conventional stator and a Halbach permanent magnet array for the permanent magnets, and the motor described in Embodiment 1 is compared with the third comparative motor. The third comparative motor has the same dimensional parameters as the motor described in Embodiment 1. The difference is that the rotor of the third comparative motor uses a conventional iron core pole, and the permanent magnet structure uses the same Halbach permanent magnet array as the alternating pole fault-tolerant permanent magnet vernier motor with a magnetic focusing type disclosed in Chinese Invention Patent CN109861413A. Its stator is a conventional stator without magnetic barriers 211.

[0057] The three-no-load back EMF waveforms and harmonic amplitudes of the motor and the comparison motor described in Example 1 are as follows: Figure 11 , Figure 12 As shown. By Figure 11 as well as Figure 12 As can be seen, the motor described in Embodiment 1 has a higher fundamental back EMF amplitude and better waveform sinusoidal characteristics. Specifically, the fundamental back EMF amplitude of the motor described in Embodiment 1 is 60.3V, with a harmonic distortion rate of 3%, while the fundamental back EMF amplitude of the comparative motor three is 54.8V, with a harmonic distortion rate of 5.6%. Compared to the comparative motor three, the fundamental back EMF amplitude of the motor described in Embodiment 1 is increased by 10%, and the harmonic distortion rate is reduced by 2.6%.

[0058] The three-output torque waveforms of the motor described in Example 1 and the comparison motor are as follows: Figure 13 As shown. By Figure 13 As can be seen, with the same amount of permanent magnets, thanks to the enhancement of operating harmonics and the sufficient suppression of non-operating harmonics, the motor described in Embodiment 1 has a higher and more stable output torque. Specifically, the output torque of the motor described in Embodiment 1 is 12.86 Nm, with a torque ripple of 3.3%, while the output torque of the comparison motor three is 11.82 Nm, with a torque ripple of 4.1%. Compared to the comparison motor three, the motor described in Embodiment 1 has an 8.8% increase in torque and a 0.8% decrease in torque ripple.

[0059] In traditional solutions, Halbach permanent magnet arrays are often used to address the severe inter-pole leakage and low torque density of alternating pole vernier permanent magnet motors, aiming to improve inter-pole leakage and increase torque density. However, this approach primarily focuses on enhancing operating harmonics while failing to adequately suppress non-operating harmonics, thus hindering the full utilization of permanent magnets and achieving high torque quality. Furthermore, the complex fabrication of Halbach array permanent magnets diminishes the low-cost advantage of alternating pole structures.

[0060] This invention optimizes the magnetic permeability distribution through a rotor core pole 121 harmonic shaping and orientation design. This suppresses non-operating harmonics while reducing inter-pole leakage flux and increasing the fundamental amplitude of the permanent magnet flux density, thus avoiding the need for a complex Halbach permanent magnet array. This increases torque density while reducing motor cost. Simultaneously, by embedding magnetic barriers in the stator teeth, the path of low-order non-operating harmonics in the armature flux density is effectively blocked and their amplitude weakened, further suppressing non-operating harmonics and improving the motor's torque quality.

[0061] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the technical solutions of the present invention, and are not intended to limit the specific implementation of the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the claims of the present invention should be included within the protection scope of the claims of the present invention.

Claims

1. A permanent magnet motor based on a harmonic-modified rotor and a stator with magnetic barriers, comprising a rotor (1) and a stator (2), wherein the rotor (1) is coaxially sleeved inside the stator (2), and an air gap (3) is provided between the rotor (1) and the stator (2), characterized in that, The rotor (1) includes: a plurality of rotor permanent magnets (11) and a rotor core (12) that are uniformly spaced along the circumferential direction and magnetized in the same direction, with the rotating shaft passing through the central hole of the rotor core (12) and fixed thereto; The rotor core (12) includes a rotor core pole (121) and a rotor yoke (122), and the rotor core pole (121) adopts a harmonic-modified orientation design; The rotor core pole (121) adopts a harmonic-modified orientation design, specifically: The circumferential radius of a single rotor core pole (121) is , From radial thickness The arc-shaped base and the outline shape are Composed of an arc-shaped top, The design is as follows: in, The outer radius of the rotor yoke (122); The maximum radial thickness of the arc-shaped top must satisfy... , The radial thickness of the rotor permanent magnet (11) is the maximum radial thickness of the rotor core pole (121); , b , c These are the amplitudes of the fundamental wave, the third harmonic, and the fifth harmonic, respectively. Half the motor pole pitch With a single rotor core pole (121) radians The ratio is ; is the number of pole pairs of the rotor permanent magnet (11); The rotor core pole number (121) is the serial number. ; The radius of curvature along the circumference with the center of the rotation axis as the origin, for each of the aforementioned serial numbers , The range of values ​​is limited to ; The stator (2) includes stator teeth (21), stator yoke (22) and armature winding (23). Magnetic barriers (211) are embedded between the stator teeth (21). Iron core bridges (212) are provided at the tips of the stator teeth (21) with magnetic barriers (211). A magnetic barrier (211) is embedded between the stator teeth (21), and a core bridge (212) is provided at the tip of the stator teeth (21) with the magnetic barrier (211) to connect them.

2. The alternating pole vernier permanent magnet motor based on a harmonic-modified rotor and a magnetic barrier stator according to claim 1, characterized in that, The rotor core pole (121) has an arc-shaped top profile. Amplitude of the fundamental frequency, third and fifth harmonics , b , c Satisfy the set constraints: exist The range of values By substituting multiple discrete values ​​of the same n into the constraints and solving the simultaneous equations, the constraint conditions can be obtained. , b , c value.

3. The alternating pole vernier permanent magnet motor based on a harmonic-modified rotor and a magnetic barrier stator according to claim 2, characterized in that, The permanent magnet (11) is radially magnetized, with the magnetization direction radially outward, and the number of pole pairs is... P r Its radial thickness is 14. 3mm; permanent magnet (11) pole arc coefficient ,in The circumference of a single permanent magnet (11) is the radius of curvature, and the motor pole pitch is... , It is an extreme logarithm.

4. The alternating pole vernier permanent magnet motor based on a harmonic-modified rotor and a magnetic barrier stator according to claim 1, characterized in that, The stator teeth (21) adopt a straight tooth design, with a total number of teeth of Z. s And every other stator tooth (21) is provided with a width of w g The magnetic barrier (211) and the tips of the stator teeth (21) with the magnetic barrier (211) are made of a thickness of w i The iron core bridge (212) is connected.

5. The alternating pole vernier permanent magnet motor based on a harmonic-modified rotor and a magnetic barrier stator according to claim 1, characterized in that, The armature winding (23) is a single-layer fractional-slot concentrated winding with a pole pair number of P a satisfy P a + P r = Z s .

6. The alternating pole vernier permanent magnet motor based on a harmonic-modified rotor and a magnetic barrier stator according to claim 1, characterized in that, The width w of the magnetic barrier (211) g =1.3mm, the thickness w of the core bridge (212) i =0.5mm.

7. The alternating pole vernier permanent magnet motor based on a harmonic-modified rotor and a magnetic barrier stator according to claim 5, characterized in that, The number of pole pairs P of the rotor permanent magnet (11) r =14, Stator (2) Total number of teeth Z s =24, armature winding (23) pole pair number P a =10.

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