Permanent magnet motor

Abstract

The utility model provides a permanent magnet motor, which comprises a rotor assembly, the rotor assembly comprises a rotor core and a plurality of permanent magnet groups, each permanent magnet group comprises two permanent magnets, each permanent magnet is embedded in the rotor core, and the distance between the two permanent magnets belonging to any permanent magnet group is gradually increased along the radial direction of the rotor assembly; the stator assembly is arranged around the rotor assembly; the structure of each permanent magnet group satisfies that 0.38 < = 2 * P * (2 * S) * (theta1 / theta2) * (D1 / D2) / 1000 < = 0.59, P is the number of pole pairs of the permanent magnet motor, S is the projection area of any permanent magnet in a preset plane, the preset plane is perpendicular to the axial direction of the permanent magnet motor, theta1 is the included angle between the two permanent magnets of any permanent magnet group, and D1 is the included angle between the two permanent magnets of any permanent magnet group. Theta2 is the maximum central angle occupied by any permanent magnet group, D1 is the inner diameter of the stator assembly, and D2 is the outer diameter of the stator assembly. The compressor body provided by the utility model solves the technical problem of poor performance and cost control of a permanent magnet motor in the prior art.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of motor, specifically, relate to a permanent magnet motor. BACKGROUND

[0002] Now, permanent magnet motor has extensive application in each field, and the permanent magnet of permanent magnet motor usually adopts rare earth magnetic steel, and the material cost of rare earth magnetic steel is an important factor influencing the overall cost of motor. In the related art, when manufacturing the motor, it is difficult to accurately control the usage amount of the permanent magnet. Too much permanent magnet usage will result in high motor cost; too little permanent magnet usage will result in low motor flux linkage and low demagnetization resistance, thereby affecting the motor performance.

[0003] It can be seen that the related art cannot balance the cost and performance of the permanent magnet motor, and there is a technical problem of poor performance and cost control of the permanent magnet motor. At present, no effective solution has been proposed for this technical problem. SUMMARY

[0004] The main purpose of the utility model is to provide a kind of permanent magnet motor, to solve the technical problem of poor performance and cost control of permanent magnet motor in the related art.

[0005] In order to achieve the above purpose, the embodiment of the utility model provides a kind of permanent magnet motor, the permanent magnet motor includes: rotor assembly, rotor assembly includes rotor core and multiple permanent magnet groups, each permanent magnet group includes two permanent magnets, each permanent magnet is embedded in rotor core, along the radial direction of rotor assembly, the distance between the two permanent magnets belonging to any one permanent magnet group gradually increases;Stator assembly, stator assembly is arranged around rotor assembly;The structure of each permanent magnet group satisfies, 0.38≤2×P×(2×S)×(θ1 / θ2)×(D1 / D2) / 1000≤0.59, wherein, P is the pole pair number of permanent magnet motor, S is the projection area of any one permanent magnet in the preset plane, the preset plane is perpendicular to the axial direction of permanent magnet motor, θ1 is the included angle between the two permanent magnets of any one permanent magnet group, θ2 is the maximum central angle occupied by any one permanent magnet group, D1 is the inner diameter of stator assembly, D2 is the outer diameter of stator assembly.

[0006] Further, the projection of each permanent magnet in the preset plane is a rectangle, the length of the rectangle is L, and the width is H, wherein L> H, wherein the length of the rectangle is 6.5mm≤L≤7.5mm.

[0007] Further, the projection of each permanent magnet in the preset plane is a rectangle, the length of the rectangle is L, and the width is H, wherein L> H, wherein the length of the rectangle is 6.5mm≤L≤7.5mm.

[0008] Further, 115°≤θ1≤135°.

[0009] Further, 27°≤θ2≤32°.

[0010] Further, 0.56≤D1 / D2≤0.6, wherein 96mm≤D2≤108mm.

[0011] Further, the stator assembly comprises: a yoke portion in a ring structure; a plurality of stator teeth which are sequentially and spacedly arranged on an inner wall surface of the yoke portion along a circumferential direction of the yoke portion, and a stator slot is formed between any two adjacent stator teeth; wherein the number of the stator slots is 15, and the pole pair number P of the permanent magnet motor is 5.

[0012] Further, the Br value of each permanent magnet ranges from 1.30T to 1.42T, and the Hcj value of each permanent magnet ranges from 1650KA / m to 1900KA / m.

[0013] Further, the permanent magnet motor is a concentrated winding motor.

[0014] Further, the rotating speed of the permanent magnet motor ranges from 0rpm to 8000rpm.

[0015] The permanent magnet motor of the embodiment of the utility model includes: rotor assembly, rotor assembly includes rotor core and multiple permanent magnet groups, each permanent magnet group includes two permanent magnets, each permanent magnet is embedded in the rotor core, along the radial direction of the rotor assembly, the distance between the two permanent magnets of any one permanent magnet group gradually increases;Stator assembly, stator assembly is arranged around the rotor assembly;The structure of each permanent magnet group satisfies, 0.38≤2XPx (2XS) x (θ1 / θ2) x (D1 / D2) / 1000≤0.59, wherein, P is the pole pair number of the permanent magnet motor, S is the projection area of any one permanent magnet in the preset plane, the preset plane is perpendicular to the axial direction of the permanent magnet motor, θ1 is the included angle between the two permanent magnets of any one permanent magnet group, θ2 is the maximum central angle occupied by any one permanent magnet group, D1 is the inner diameter of the stator assembly, and D2 is the outer diameter of the stator assembly.The permanent magnet motor of the embodiment of the utility model, by the size and the arrangement posture of permanent magnet are redesigned, make each permanent magnet group structure satisfy, 0.38≤2XPx (2XS) x (θ1 / θ2) x (D1 / D2) / 1000≤0.59, wherein, P is the pole pair number of the permanent magnet motor, S is the projection area of any one permanent magnet in the preset plane, the preset plane is perpendicular to the axial direction of the permanent magnet motor, θ1 is the included angle between the two permanent magnets of any one permanent magnet group, θ2 is the maximum central angle occupied by any one permanent magnet group, D1 is the inner diameter of the stator assembly, and D2 is the outer diameter of the stator assembly.After the above structure design, the size and the arrangement posture of permanent magnet of permanent magnet motor are limited, in a certain inclination attitude range, the projection area S of permanent magnet in the preset plane will be limited in a reasonable interval, so that the size of permanent magnet is appropriate, which can avoid the high manufacturing cost of permanent magnet motor caused by the oversize permanent magnet, and can avoid the poor motor performance and insufficient anti-demagnetization caused by the undersize permanent magnet, so that the performance and cost of the motor can be considered, and the technical problems of poor performance and cost control of the permanent magnet motor in the related art are solved. BRIEF DESCRIPTION OF DRAWINGS

[0016] The drawings accompanying the specification of this application form a part hereof, serve to provide further understanding of the application, and together with the description of the application, explain the application. In the drawings:

[0017] Figure 1 It is the structure schematic view of the rotor assembly and the stator assembly of the embodiment of the permanent magnet motor of the utility model after assembly;

[0018] Figure 2 It is the structure schematic view of the rotor assembly of the embodiment of the permanent magnet motor of the utility model;

[0019] Figure 3The utility model discloses a permanent magnet motor's embodiment's stator subassembly's structure schematic view.

[0020] Figure 4 The utility model discloses permanent magnet motor different pole number and slot number's embodiment's magnetic steel area pole demagnetization resistance ability schematic diagram.

[0021] Among them, the above-mentioned drawing includes the following figure marks:

[0022] 1, rotor assembly;11, rotor core;12, permanent magnet group;121, permanent magnet;13, magnetic steel slot;2, stator subassembly;21, yoke part;22, stator tooth;23, stator slot;24, stator winding;25, boot part. DETAILED DESCRIPTION

[0023] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The utility model will be described in detail below with reference to the drawings and in combination with the embodiments.

[0024] Please refer to Figure 1 In order to achieve the above-mentioned purpose, the embodiment of the utility model provides a kind of permanent magnet motor, which includes: rotor assembly 1, rotor assembly 1 includes rotor core 11 and multiple permanent magnet groups 12, each permanent magnet group 12 includes two permanent magnets 121, each permanent magnet 121 is embedded in rotor core 11, along the radial direction of rotor assembly 1, the distance between the two permanent magnets 121 belonging to any one permanent magnet group 12 gradually increases;Stator subassembly 2, stator subassembly 2 is arranged around rotor assembly 1;The structure of each permanent magnet group 12 satisfies, 0.38≤2×P× (2×S) × (θ1 / θ2) × (D1 / D2) / 1000≤0.59, wherein, P is the pole pair number of permanent magnet motor, S is the projection area of any one permanent magnet 121 in preset plane, preset plane is perpendicular to the axial direction of permanent magnet motor, θ1 is the included angle between the two permanent magnets 121 of any one permanent magnet group 12, θ2 is the maximum central angle occupied by any one permanent magnet group 12, D1 is the inner diameter of stator subassembly 2, D2 is the outer diameter of stator subassembly 2.

[0025] The permanent magnet motor is designed by redesigning the size and arrangement posture of the permanent magnet 121, so that the structure of each permanent magnet group 12 satisfies 0.38<=2xPx(2xS)x(θ1 / θ2)x(D1 / D2) / 1000<=0.59, wherein P is the pole pair number of the permanent magnet motor, S is the projection area of any one permanent magnet 121 in the preset plane, the preset plane is perpendicular to the axial direction of the permanent magnet motor, θ1 is the included angle between the two permanent magnets 121 of any one permanent magnet group 12, θ2 is the maximum central angle occupied by any one permanent magnet group 12, D1 is the inner diameter of the stator assembly 2, and D2 is the outer diameter of the stator assembly 2. After the above structure design, the size and arrangement posture of the permanent magnet 121 of the permanent magnet motor are limited, and within a certain inclination posture range, the projection area S of the permanent magnet 121 in the preset plane is limited in a reasonable interval, so that the size of the permanent magnet 121 is appropriate, which can avoid that the permanent magnet 121 is too large to cause the manufacturing cost of the permanent magnet motor to be too high, and can avoid that the permanent magnet 121 is too small to cause poor motor performance and insufficient anti-demagnetization capability, so that the performance and cost of the motor can be considered, and the technical problems of poor performance and cost control of the permanent magnet motor in the related art are solved.

[0026] Wherein, along the radial direction of the rotor assembly 1, that is, the direction from the center of the rotor assembly 1 to the edge of the rotor assembly, along the direction, the distance between the two permanent magnets 121 belonging to the same permanent magnet group 12 gradually increases. That is, the two permanent magnets 121 contained by the permanent magnet group 12 are arranged in a V shape, and the opening of the V shape faces outward, rather than towards the center of the rotor assembly 1.

[0027] As shown in Figure 2 , θ2 is the maximum central angle occupied by any one permanent magnet group 12, that is, the included angle formed by the connection line between the outer ends of the two permanent magnets 121 of the permanent magnet group 12 and the center of the permanent magnet motor, and the outer end of the permanent magnet 121 is the end far away from the center axis of the permanent magnet motor.

[0028] Specifically, the rotor core 11 is provided with a plurality of groups of magnetic steel grooves 13, and each permanent magnet group 12 is correspondingly arranged in each group of magnetic steel grooves 13.

[0029] In one specific embodiment, the projection of each permanent magnet 121 in the preset plane is a rectangle, the length of the rectangle is L, and the width of the rectangle is H, where L > H, and the length of the rectangle is 6.5 mm ≤ L ≤ 7.5 mm. The length L of the projection of the permanent magnet 121 in the preset plane directly affects the efficiency of the permanent magnet motor and the amount of permanent magnet used. If it is set too large, it will cause the magnetic density of the yoke 21, the stator teeth 22, and other positions of the permanent magnet stator assembly 2 to be too high, the stator iron loss will increase, and the amount of permanent magnet used will increase, resulting in an increase in the cost of the permanent magnet motor. If it is set too small, it will cause the motor output to be insufficient, the motor efficiency will be too low, and the motor performance will be affected. The permanent magnet motor of the present embodiment designs L to be 6.5 mm ≤ L ≤ 7.5 mm, which can avoid the adverse effects caused by setting it too large or too small, and balances the motor efficiency and cost.

[0030] Specifically, the projection of each permanent magnet 121 in the preset plane is a rectangle, the length of the rectangle is L, and the width of the rectangle is H, where L > H, and the width of the rectangle is 1.2 mm ≤ H ≤ 1.4 mm. The width H of the projection of the permanent magnet 121 in the preset plane affects the demagnetization resistance and the cost of the permanent magnet 121. Specifically, if it is too large, it will cause the amount of permanent magnet 121 to be too large, which in turn will cause the cost of the motor to increase, and if it is too small, it will cause the demagnetization resistance to be low, which will pose a risk to the operation of the motor. In the present embodiment, H is designed to be 1.2 mm ≤ H ≤ 1.4 mm, which avoids the shortcomings caused by designing it too large or too small, and balances the demagnetization resistance and cost.

[0031] Preferably, 115° ≤ θ1 ≤ 135°. That is, for any one permanent magnet group 12, the angle formed between the two permanent magnets 121 arranged in a V shape is controlled in the range of 115° ≤ θ1 ≤ 135°. Using this parameter design can make the motor back electromotive force positive rotation, the cogging torque, the torque fluctuation, and the output torque all be at a relatively ideal design value. If it is too large or too small, it will cause some of the parameters to deteriorate, thereby causing the motor performance to decline, which does not meet the design requirements.

[0032] In the present embodiment, the value of θ2 is further designed to be 27° ≤ θ2 ≤ 32°. By using this parameter design, the pole arc coefficient of the motor can be kept within a relatively appropriate range, and the setting of θ2 will have a certain influence on the Ld and Lq values of the motor, electromagnetic noise, and efficiency. After using the above parameter range design, the above aspects can be well balanced, so that the motor is in a better working state.

[0033] In this embodiment, by controlling the motor split ratio, 0.56≤D1 / D2≤0.6 and 96mm≤D2≤108mm are achieved. The parameter design within this range facilitates the reasonable arrangement of the number of turns of the motor winding and the amount of rotor magnets used, which is beneficial to the motor output torque and efficiency. Moreover, the above settings can also make the rotor outer diameter larger, increase the rotor's rotational inertia, and make it easier to control the smooth operation.

[0034] like Figure 1 and Figure 3 As shown, the stator assembly 2 includes: a yoke 21, which is an annular structure; a plurality of stator teeth 22, which are arranged sequentially and spaced along the circumference of the yoke 21 on the inner wall surface of the yoke 21, and a stator slot 23 is formed between any two adjacent stator teeth 22; wherein, the number of stator slots 23 is 15, and the number of pole pairs of the permanent magnet motor is P = 5.

[0035] Since the yoke 21 is an annular structure, its inner wall surface, which is the inner circumferential surface of the annular structure, is a cylindrical surface. The stator teeth 22 are disposed on this inner wall surface and are spaced apart circumferentially. The stator slots 23 are defined between adjacent stator teeth 22. The stator assembly 2 also includes a stator winding 24, and the stator slots 23 are used to accommodate the stator winding 24.

[0036] Specifically, each stator tooth 22 is provided with a shoe portion 25 at its end. The shoe portion 25 extends into the adjacent stator tooth 22, thereby reducing the opening of the stator slot 23. This not only helps to prevent the stator winding 24 from coming out of the stator slot 23, but also helps to reduce the air gap magnetic resistance, thereby improving the magnetic field distribution.

[0037] The Br value of each permanent magnet 121 ranges from 1.30T to 1.42T, and the Hcj value of each permanent magnet 121 ranges from 1650KA / m to 1900KA / m.

[0038] Among them, Br value is the remanence of permanent magnet 121, which is a magnetic performance parameter of the magnet, and Hcj value is the intrinsic coercivity, which is a parameter of the magnet's resistance to demagnetization. By selecting permanent magnet 121 with appropriate Br and Hcj values, and in conjunction with the above-mentioned permanent magnet size and arrangement design, a smaller amount of magnets and better resistance to demagnetization can be achieved, thus balancing the performance and cost of permanent magnet motors.

[0039] In one specific embodiment, the permanent magnet motor is a concentrated winding motor, and the speed range of the permanent magnet motor during operation is from 0 rpm to 8000 rpm.

[0040] like Figure 4 As shown, Figure 4The magnetic steel area of the permanent magnet motor with different pole numbers and slot numbers is shown in the schematic diagram of the demagnetization resistance capability of the embodiment of the permanent magnet motor of the utility model, wherein, A is the magnetic steel area, that is, the sum of the areas of all the permanent magnets 121 in the permanent magnet motor in the projection in the preset plane, and B is the demagnetization resistance capability at 120 DEG C, and it can be seen that, for 6-pole 9-slot, 8-pole 12-slot and 10-pole 15-slot, the demagnetization resistance capability can be kept good under smaller magnetic steel area, the performance and cost of the motor can be well balanced, and the technical problem of poor performance and cost control of the permanent magnet motor in the related art is solved.

[0041] From the above description, it can be seen that the embodiment of the utility model realizes the following technical effects:

[0042] The embodiment of the utility model provides a kind of permanent magnet motor, the size and arrangement posture of permanent magnet 121 are redesigned, so that the structure of each permanent magnet group 12 satisfies, 0.38≤2×P× (2×S) × (θ1 / θ2) × (D1 / D2) / 1000≤0.59, wherein, P is the pole pair number of permanent magnet motor, S is the projection area of any one permanent magnet 121 in preset plane, preset plane is perpendicular to the axial direction of permanent magnet motor, θ1 is the included angle between two permanent magnets 121 of any one permanent magnet group 12, θ2 is the maximum central angle occupied by any one permanent magnet group 12, D1 is the inner diameter of stator assembly 2, D2 is the outer diameter of stator assembly 2. After adopting the above structure design, the size and arrangement posture of permanent magnet 121 of permanent magnet motor are limited, in certain inclination posture range, the projection area S of permanent magnet 121 in preset plane will be limited in a reasonable interval, so that the size of permanent magnet 121 is appropriate, it can avoid that permanent magnet 121 size is too large to cause that permanent magnet motor manufacturing cost is too high, it can avoid that permanent magnet 121 size is too small to cause that motor performance is poor and anti demagnetization capability is insufficient, so that the performance and cost of motor can be balanced, the technical problem of poor performance and cost control of permanent magnet motor in the related art is solved.

[0043] For purposes of the description hereinafter, the terms "upper", "lower", "right", "left", "rear", "front", "vertical" and "horizontal" as can be perceived herein relative to the accompanying drawings refer to the orientation of the components being described. However, it is to be understood that the exemplary embodiments described herein can assume different alternative orientations, except where expressly specified to the contrary. It is also to be understood that the specific devices illustrated in the attached drawings, and described in the following specification are exemplary embodiments only and do not limit the scope of the application.

[0044] It is also important to note that the term "or" as used herein is intended to mean any possible combination of the enumerated items inter alia. For example, the phrase "A or B" is intended to mean: "A; or B; or A and B." As used herein, the term "includes" and / or "including", when used in this specification, mean "including, but not limited to." As used herein, the term "coupled" means the joining of two members directly or indirectly. As used herein, the term "truncated" means that the length of the member is less than the length of the original member.

[0045] It is to be understood that the singular forms "a", "an", and "the" include plural referents unless the context clearly dictates otherwise. Preferably, the terms "comprise", "comprises" and / or "comprising", as used herein, are intended to be synonymous with the term "include" and / or "including", as used herein, such that the terms "comprise", "comprises" and / or "comprising" and / or the term "include" and / or "including" are inclusive or open-ended and do not exclude additional, unrecited elements or method steps.

[0046] The preferred embodiments of the present application have been described herein above with the understanding that solely the preferred embodiments of the present application are shown and described and that alterations and changes in the preferred embodiments of the present application described herein are possible by those having ordinary skill in the art without departing from the spirit and scope of this application. Therefore, the scope of the present application is defined by the appended claims.

Claims

1. A permanent magnet electric machine characterized by, The application relates to a permanent magnet motor. The application relates to a permanent magnet motor. The application relates to a permanent magnet motor. The application relates to a permanent magnet motor.

2. The permanent magnet electric machine of claim 1, wherein, The application relates to a permanent magnet motor.

3. The permanent magnet electric machine of claim 1, wherein, The application relates to a permanent magnet motor.

4. The permanent magnet electric machine of claim 1, wherein, The application relates to a permanent magnet motor.

5. The permanent magnet electric machine of claim 1, wherein, The application relates to a permanent magnet motor.

6. The permanent magnet electric machine of claim 1, wherein, The application relates to a permanent magnet motor.

7. The permanent magnet electric machine of any one of claims 1 to 6, characterized by, The application relates to a permanent magnet motor. The application relates to a permanent magnet motor. The application relates to a permanent magnet motor. The application relates to a permanent magnet motor.

8. The permanent magnet electric machine of any one of claims 1 to 6, characterized by, The application relates to a permanent magnet motor.

9. The permanent magnet electric machine of any one of claims 1 to 6, characterized by, The application relates to a permanent magnet motor.

10. The permanent magnet electric machine of any one of claims 1 to 6, characterized by, The application relates to a permanent magnet motor. The application relates to a permanent magnet motor. The application relates to a permanent magnet motor. The application relates to a permanent magnet motor. The application relates to a permanent magnet motor. The application relates to a permanent magnet motor. The application relates to a permanent magnet motor. The application relates to a permanent magnet motor. The application relates to a permanent magnet motor. The application relates to a permanent magnet motor. The application relates to a permanent magnet motor. The application relates to a permanent magnet motor. The application relates to a permanent magnet motor. The application relates to a permanent magnet motor. The application relates to a permanent magnet motor. The application relates to a permanent magnet motor. The application relates to a permanent magnet motor. 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