Permanent magnet motor applied to compressor

Abstract

A permanent magnet motor applied to a compressor comprises a stator and a rotor, the stator comprises stator iron, and the rotor comprises a rotor iron core; wherein the output rated power of the permanent magnet motor is less than or equal to 450W, the outer diameter of the stator core is D, the product thickness of the stator core is H, and the maximum circle area A of the stator core, the residual magnetism Br of the magnet and the size of the magnet are within a proportional range under the conditions that 2.25 < = D / H < = 3.65 and the residual magnetism Br of the magnet at 20 DEG C is less than or equal to 1.29 T; compared with the prior art, relatively high permanent magnet motor efficiency can be obtained by using relatively few permanent magnet motor materials, so that the permanent magnet motor design with high efficiency, low cost and relatively high CP (Cost-Performance) value is achieved, the product thickness of the permanent magnet motor is reduced, and the overall height of the compressor is further reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and in particular to a permanent magnet motor applied to a compressor. Background Art

[0002] The existing rotary compressor mainly includes the following components: exhaust pipe, casing, permanent magnet motor (stator, rotor), transmission shaft, upper bearing, silencer, compression unit (cylinder, piston), lower bearing, bottom cover, outlet pipe, liquid reservoir and inlet pipe. The basic working principle of the compressor is as follows: when the compressor is powered on, the stator generates a magnetic field, which causes the rotor to rotate, driving the transmission shaft, causing the piston to move eccentrically in the cylinder, thereby compressing the low-temperature and low-pressure gas refrigerant into high-temperature and high-pressure gas, which is then discharged from the cylinder to the shell through the silencer. Then, after passing through the trimming of the outer side of the stator and the gap between the rotors, it is discharged into the refrigeration cycle system through the outlet pipe.

[0003] However, due to the requirements of various countries to improve the energy efficiency of air conditioners and compressors, permanent magnet motors are forced to add more parts and materials, such as increasing the thickness of the motor, increasing the amount of copper wire, and increasing the remanence of the magnet Br, etc. to improve the motor performance. However, for low-capacity compressor applications, adding magnetic permeable parts and materials to permanent magnet motors has little effect on improving performance, and the material cost has increased dramatically in recent years, and copper, iron and rare earth materials have even increased at a multiple rate, which has a poor CP value (Cost-Performance ratio) effect in compressors of this capacity. Therefore, how to improve performance and reduce material usage costs has become an urgent problem to be solved.

[0004] In view of this, the inventor has devoted himself to studying the above-mentioned prior art and has applied theoretical knowledge to try his best to solve the above-mentioned problems, which has become the goal of the inventor's improvement. Summary of the invention

[0005] Therefore, the purpose of the present invention is to provide a permanent magnet motor combination with a high CP value for use in a hermetic compressor with a permanent magnet motor output power below 450W, so as to reduce the cost of iron cores, magnets, and copper wires, resist the problem of rising raw material costs, reduce the overall height of the compressor, and improve the performance efficiency of the permanent magnet motor, so as to solve the problems existing in the above-mentioned prior art.

[0006] To achieve the above object, the present invention proposes a permanent magnet motor applied to a compressor, comprising:

[0007] A stator includes a stator core, the stator core having a central hole, a yoke and a plurality of stator teeth; the central hole is formed in the middle of the stator core to form a through-hole;

[0008] The stator teeth are connected to the yoke, the stator teeth are arranged at intervals along the circumferential direction of the yoke, the stator teeth are arranged on the inner side of the yoke, and a stator slot is defined between every two adjacent stator teeth; and

[0009] A rotor, comprising a rotor core, which is arranged in the central hole of the stator core, and the rotor core can rotate relative to the stator core; an axial hole is arranged at the center of the rotor core, the axial hole passes through the two ends of the rotor core, and is evenly divided into a plurality of magnetic blocks with the axial hole as the center, and each of the magnetic blocks is provided with a magnet;

[0010] The output rated power of the permanent magnet motor is ≤450W, the outer diameter of the stator core is D, the thickness of the stator core is H, and 2.25≦D / H≦3.65 is satisfied.

[0011] Preferably, the remanence Br of the magnet at 20°C is ≦1.29T.

[0012] Preferably, the maximum circular area of ​​the stator core is A, the thickness of the magnet is t, the width of the magnet slot is W and the remanence Br of the magnet at 20°C satisfies: The unit of A is mm 2 ; The unit of Br is T; the units of W and t are both mm.

[0013] Preferably, the number of magnetic blocks of the rotor core is 6; the number of stator slots of the stator core is 9.

[0014] Preferably, the number of magnetic blocks of the rotor core is 8; the number of stator slots of the stator core is 12.

[0015] Preferably, the number of magnetic blocks of the rotor core is 8 or more; the number of stator slots of the stator core is 12 or more.

[0016] Preferably, each of the magnetic blocks is provided with a magnet groove, the magnet groove runs through the bottom surface of the magnetic block along the top surface of the magnetic block, and the magnet groove is used for installing the magnet.

[0017] Preferably, the magnet slots of each magnetic block are in an I-shaped or V-shaped shape.

[0018] Preferably, the magnet slot of each magnetic block is V-shaped, and the number of magnets in the magnet slot is at least two.

[0019] It can be seen from the above structure that the beneficial effects of the present invention are:

[0020] 1. A permanent magnet motor for a compressor includes a stator and a rotor, wherein the stator includes a stator core, and the rotor includes a rotor core; wherein the output rated power of the permanent magnet motor is ≤450W, and the outer diameter of the stator core is D, the thickness of the stator core is H, and 2.25≦D / H≦3.65 is satisfied, thereby achieving a high-efficiency, low-cost, and high-CP (Cost-Performance ration) permanent magnet motor design, making the thickness of the permanent magnet motor smaller, thereby reducing the overall height of the compressor.

[0021] 2. A permanent magnet motor for a compressor includes a stator and a rotor, wherein the stator includes a stator iron, and the rotor includes a rotor core. An axial hole is provided at the center of the rotor core, and the axial hole passes through both ends of the rotor core, and is evenly divided into a plurality of magnetic blocks with the axial hole as the center, and each of the magnetic blocks is provided with a magnet; wherein the permanent magnet motor is used for a compressor, and the output rated power of the permanent magnet motor is ≤450W, and the outer diameter of the stator core is D, and the stator The thickness of the core is H, and satisfies 2.25≦D / H≦3.65. When the remanence Br of the magnet at 20°C is ≦1.29T, the area of ​​the circle with the maximum diameter of the stator core outer diameter is A (the area of ​​the circle with the maximum diameter of the stator outer diameter), the thickness of the magnet is t, the width of the magnet is W, and the remanence Br and the magnet size are within a proportional range. Less permanent magnet motor material can be used to obtain higher motor efficiency, but it is not limited to the number of poles of the rotor and the number of slots of the stator. The said proportional range must meet: The unit of A is mm 2 ; Br is in T; W and t are both in mm. In this way, the residual magnetism of the magnet Br≦1.29T can be used to reduce the rare earth material of the magnet, and even achieve the application of rare earth magnets. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 FIG. 1 is a top view of a first type of permanent magnet motor of the present invention.

[0023] Figure 2 For the present invention Figure 1 Side view of.

[0024] Figure 3 FIG. 4 is a top view of a second type of the permanent magnet motor of the present invention.

[0025] Figure 4 FIG. 4 is a top view of a third type of the permanent magnet motor of the present invention.

[0026] Figure 5 FIG. 4 is a top view of a fourth type of the permanent magnet motor of the present invention.

[0027] 1 Permanent Magnet Motor 11 Stator

[0028] 110 stator core 111 center hole

[0029] 112 yoke 113 stator teeth

[0030] 114 stator slots 12 rotor

[0031] 120 rotor core 121 shaft hole

[0032] 122 Magnetic block 123 Magnet slot

[0033] 124 Magnet

[0034] D Outer diameter H Thickness

[0035] W Width t Thickness DETAILED DESCRIPTION

[0036] In order to understand the features, contents and advantages of the present invention and the effects that can be achieved, the present invention is hereby described in detail as follows in conjunction with the drawings and in the form of embodiments. The drawings used therein are intended only for illustration and auxiliary description and may not be the actual proportions and precise configurations after the implementation of the present invention. Therefore, the proportions and configurations of the attached drawings should not be interpreted or limited to the scope of rights of the present invention in actual implementation.

[0037] The advantages, features and technical methods achieved by the present invention will be described in more detail with reference to exemplary embodiments and the accompanying drawings so that they are easier to understand, and the present invention may be implemented in different forms, so it should not be understood as being limited to the embodiments described herein. On the contrary, for ordinary technicians in this field, the provided embodiments will make this disclosure more thorough and comprehensive and completely convey the scope of the present invention, and the present invention will only be defined by the attached claims.

[0038] First, see Figures 1 to 5 , which is the "permanent magnet motor applied to a compressor" of the present invention, the permanent magnet motor 1 includes: a stator 11 and a rotor 12.

[0039] The stator 11 includes a stator core 110, which is a cylindrical body with a predetermined length. The stator core 110 is selected from a plurality of silicon steel sheets and is punched by a stamping die; the stator core 110 has a center hole 111, a yoke 112 and a plurality of stator teeth 113, and the center hole 111 is formed in the middle of the stator core 110 to form a through shape; the stator teeth 113 are connected to the yoke 112, and the stator teeth 113 are arranged at intervals along the circumferential direction of the yoke 112. The stator teeth 113 are arranged on the inner side of the yoke 112, and a stator slot 114 is defined between each two adjacent stator teeth 113. The outer contour of the stator core 110 is circular.

[0040] The rotor 12 includes a rotor core 120, which is a cylindrical body with a predetermined length. The rotor core 120 is arranged in the central hole 111 of the stator core 110, and the rotor core 120 can rotate relative to the stator core 110; an axial hole 121 is provided at the center of the rotor core, and the axial hole 121 is used to install the motor shaft (not shown in the figure). The axial hole 121 passes through both ends of the rotor core 120, that is, the upper end and the lower end of the rotor core 120, and is evenly divided into a plurality of magnetic blocks 122 with the axial hole 121 as the center; and each of the magnetic blocks 122 is provided with a magnet 124. The rotor core 120 of the present invention is a cylindrical body formed by overlapping a plurality of silicon steel sheets from bottom to top, and an inner hole is provided at the center of each silicon steel sheet, and the overlapping forms the shaft hole 121 for matching the rotor core 120 with the motor shaft (not shown).

[0041] Based on the above structure, further explanation is given below:

[0042] In the above, the output rated power of the permanent magnet motor 1 is ≤450W, the outer diameter of the stator core 110 is D, the thickness of the stator core 110 is H, and 2.25≤D / H≤3.65 is satisfied, and the remanence Br of the magnet at 20°C is ≤1.29T. Therefore, under this condition, the maximum circular area of ​​the stator core 110 is A, the thickness of the magnet 124 is t, the width of the magnet 123 is W, and the remanence Br of the magnet at 20°C satisfies: The unit of A is mm 2 ; The unit of Br is T; the units of W and t are both mm.

[0043] In this embodiment, the magnets 124 are respectively disposed at the magnetic blocks 122 of the rotor core 120; and each of the magnetic blocks 122 is provided with a magnet slot 123, which passes through the bottom surface of the magnetic block 122 along the top surface of the magnetic block 122, and the magnet slot 123 is used to install the magnets 124. The magnet slot 123 of each of the magnetic blocks 122 is in an I-shaped or V-shaped shape; wherein the magnet slot 124 of each of the magnetic blocks 123 is in a V-shaped shape, and the number of magnets 124 in the magnet slot 123 is at least two.

[0044] In this embodiment, the number of magnetic blocks 122 of the rotor core 120 is 6, and the shape of the magnet slots 123 of the magnetic blocks 122 of the rotor core 120 is I-shaped or V-shaped, and the magnet slots 123 are used to install the magnets 124. The rotor core 120 and the 6 or at least 12 magnets 124 embedded in the magnet slots 123 of the magnetic blocks 122 of the rotor core 120 are used to form a rotor 12 with 6 poles; and the number of stator slots 114 of the stator core 110 of the stator 11 is 9. Therefore, the permanent magnet motor 1 is a 6-pole 9-slot permanent magnet motor 1 (such as Figure 1 and Figure 3 shown).

[0045] In this embodiment, the number of magnetic blocks 122 of the rotor core 120 is 8, and the shape of the magnet slots 123 of the magnetic blocks 122 of the rotor core 120 is I-shaped or V-shaped, and the magnet slots 123 are used to install the magnets 124. The rotor core 120 and the 8 or at least 16 magnets 124 buried in the magnet slots 123 of the magnetic blocks 122 of the rotor core 120 are used to form a rotor 12 with 8 poles; and the number of stator slots 114 of the stator core 110 of the stator 11 is 12. Therefore, the permanent magnet motor 1 is an 8-pole 12-slot permanent magnet motor 1 (such as Figure 4 and Figure 5 shown).

[0046] Furthermore, the output rated power of the permanent magnet motor 1 of the present invention is ≦450W, and the main requirement is 2.25≦D / H≦3.65, the outer diameter of the stator core 110 is D, the thickness of the stator core 110 is H, and the remanence Br of the magnet 124 at 20°C is ≦1.29T. The maximum circular area A of the stator core 110 (the circular area A of the maximum diameter of the outer diameter D of the core 110), the remanence Br of the magnet 124 and the size of the magnet 124 are within a proportional range, and less permanent magnet motor 1 material can be used to obtain a higher efficiency of the permanent magnet motor 1, which is not limited to the application of the number of poles of the rotor 12 and the number of slots of the stator 11 mentioned above. Therefore, in this embodiment, in the design, the number of magnetic blocks 122 of the rotor core 120 can be more than 8; the number of stator slots 114 of the stator core 110 can be more than 12.

[0047] In summary, the permanent magnet motor 1 of the present invention includes a stator 11 and a rotor 12, wherein the stator 11 includes a stator core 110, and the rotor 12 includes a rotor core 120; wherein, the output rated power of the permanent magnet motor 1 is applied below ≦450W, and the outer diameter of the stator core 110 is D, the thickness of the stator core 110 is H, and 2.25≦D / H≦3.65 is satisfied, thereby achieving a high-efficiency, low-cost, and high-CP value (Cost-Performance ration) permanent magnet motor 1 design, which makes the thickness H of the permanent magnet motor 1 shorter, thereby reducing the overall height of the compressor.

[0048] In addition, the permanent magnet motor 1 is used for a compressor, and the output rated power of the permanent magnet motor 1 is ≤450W or less, wherein the outer diameter of the stator core 110 is D, the thickness of the stator core 110 is H, and 2.25≤D / H≤3.65 is satisfied, when the remanence Br of the magnet 124 at 20°C is ≤1.29T, the maximum circular area of ​​the stator core 110 is A, the thickness of the magnet is t, the width of the magnet 124 is W, the remanence Br of the magnet 124 and the size of the magnet 124 are within a proportional range, and less permanent magnet motor 1 material can be used to obtain a higher efficiency of the permanent magnet motor 1, but it is not limited to the number of poles of the rotor 12 and the number of slots of the stator 11. The said proportional range must satisfy: The unit of A is mm 2 ; Br is in T; W and t are both in mm. In this way, the residual magnetism Br of magnet 124 is ≦1.29T, which reduces the rare earth materials of magnets and can even achieve the application of rare earth magnets. As for the above, the present invention provides a permanent magnet motor 1 for use in a compressor, which has an output power of less than 450W and a high CP value permanent magnet motor 1 combination, so as to reduce the cost of iron core, magnet, and copper wire, resist the problem of rising original material costs, reduce the overall height of the compressor and improve the performance efficiency of the permanent magnet motor 1.

[0049] The above descriptions are merely embodiments of the present invention and are not intended to limit the scope of implementation of the present invention. All simple equivalent changes and modifications made according to the claims and the patent specification of the present invention are still within the scope of the present patent.

Claims

1. A permanent magnet motor used in a compressor, characterized in that: include: A stator comprises a stator core, the stator core having a center hole, a yoke and a plurality of stator teeth; the center hole is formed in the middle of the stator core in a through shape; the stator teeth are connected to the yoke, the stator teeth are arranged at intervals along the circumferential direction of the yoke, the stator teeth are arranged on the inner side of the yoke, and a stator slot is defined between every two adjacent stator teeth; and A rotor, comprising a rotor core, which is arranged in the central hole of the stator core, and the rotor core can rotate relative to the stator core; an axial hole is arranged at the center of the rotor core, the axial hole passes through the two ends of the rotor core, and is evenly divided into a plurality of magnetic blocks with the axial hole as the center, and each of the magnetic blocks is provided with a magnet; The output rated power of the permanent magnet motor is ≤450W, the outer diameter of the stator core is D, the thickness of the stator core is H, and 2.25≦D / H≦3.65 is satisfied.

2. The permanent magnet motor according to claim 1, characterized in that: The remanence Br of the magnet at 20°C is ≤1.29T.

3. The permanent magnet motor according to claim 2, characterized in that: The maximum circular area of ​​the stator core is A, the thickness of the magnet is t, the width of the magnet slot is W and the remanence Br of the magnet at 20°C satisfies: The unit of A is mm 2 ; The unit of Br is T; the units of W and t are both mm.

4. The permanent magnet motor according to claim 1, characterized in that: The number of magnetic blocks of the rotor core is 6; the number of stator slots of the stator core is 9.

5. The permanent magnet motor according to claim 1, characterized in that: The number of magnetic blocks of the rotor core is 8; the number of stator slots of the stator core is 12.

6. The permanent magnet motor according to claim 1, characterized in that: The number of magnetic blocks of the rotor core is more than 8; the number of stator slots of the stator core is more than 12.

7. The permanent magnet motor according to claim 1, characterized in that: Each of the magnetic blocks is provided with a magnet slot, which runs through the bottom surface of the magnetic block along the top surface of the magnetic block, and the magnet slot is used for installing the magnet.

8. The permanent magnet motor according to claim 7, characterized in that: The shape of the magnet slot of each magnetic block is either I-shaped or V-shaped.

9. The permanent magnet motor according to claim 8, characterized in that: The magnet slot of each magnetic block is V-shaped, and the number of magnets in the magnet slot is at least two.

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