Motors, compressors and refrigeration equipment

Abstract

This invention provides an electric motor, a compressor, and a refrigeration device. The electric motor includes a stator, comprising a stator core, the stator core including multiple stator teeth arranged circumferentially, with any two adjacent stator teeth forming a stator slot. The stator also includes multiple windings, each winding being disposed on one of the multiple stator teeth, each winding including multiple conductors. The slot width is Bs, the number of conductors in any winding is n, each phase winding includes a parallel-connected coil branches, and the diameter of the conductors is d. Bs, n, a, and d satisfy 0.42 ≤ (Bs / d × 10⁻⁶) / 2. 4 )×(n / a)≤2.2. In this way, the radial air gap magnetic flux density Br(a,t) can be reduced, which in turn reduces the radial electromagnetic force density Pr(a,t). This reduces the noise caused by motor excitation, thus achieving the technical effect of noise reduction for the motor.

Description

Technical Field

[0001] This invention belongs to the field of motor technology, specifically relating to a motor, a compressor, and a refrigeration device. Background Technology

[0002] As compressors become smaller, the motors used inside them are also designed to be smaller. As the power density of the smaller motors increases, the motor current increases accordingly, and the armature magnetic field strengthens. When the rotor rotates, the magnetic flux density harmonics of the radial electromagnetic force generated in the air gap magnetic field will increase, which in turn leads to increased motor noise. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

[0004] Therefore, the first objective of this invention is to provide an electric motor.

[0005] The second objective of this invention is to provide a compressor.

[0006] The third objective of this invention is to provide a refrigeration device.

[0007] To achieve at least one of the above objectives, according to a first aspect of the present invention, an electric motor is provided, comprising: a stator, including a stator core, the stator core including: a plurality of stator teeth, the plurality of stator teeth being arranged circumferentially, any two adjacent stator teeth forming a stator slot; the stator further including a plurality of windings, the plurality of windings being respectively disposed on the plurality of stator teeth, each winding including a plurality of wires; the slot opening width of the stator slot is Bs, the number of wires in any winding is n, each phase winding including a parallel connected coil branches, the diameter of the wires being d, wherein Bs, n, a, and d satisfy 0.42 ≤ (Bs / d × 10 4 )×(n / a)≤2.2.

[0008] The motor proposed in this application includes a stator, which includes a stator core. The stator core includes multiple stator laminations, which are stacked to form the stator core. The stator laminations can be made of silicon steel sheets. Further, the stator core includes multiple stator teeth, which are arranged circumferentially. Any two adjacent stator teeth form a stator slot, and the stator slots are evenly distributed circumferentially around the stator core. The minimum inner diameter of the stator core is D1.

[0009] Furthermore, the stator also includes multiple windings, each of which includes multiple conductors. The multiple windings are respectively arranged on multiple stator teeth by winding or embedding, so that the windings are located in the stator slots.

[0010] Furthermore, the noise of the motor is related to the radial electromagnetic force density in the air gap of the motor. Specifically, the radial electromagnetic force density Pr(a,t) is related to the vacuum permeability μ0 and the radial air gap magnetic flux density Br(a,t). The radial electromagnetic force density is approximately proportional to the square of the radial component of the magnetic flux density (i.e., the radial air gap magnetic flux density). That is, the relationship between the three is approximately Pr(a,t)≈1 / 2μ0×Br2(a,t). Therefore, under the same air gap, by reasonably adjusting the radial air gap magnetic flux density, the radial electromagnetic force density can be reduced, thereby reducing the noise caused by motor excitation, i.e., carrier frequency noise.

[0011] Furthermore, the radial electromagnetic force density in the air gap is related to the stator slot width Bs, the diameter d of the conductors in the winding, the number of conductors n in any winding, and the number a of parallel-connected coil branches in each phase winding. Specifically, Bs, n, a, and d satisfy 0.42 ≤ (Bs / d × 10⁻⁶) / 2. 4 )×(n / a)≤2.2. This is achieved by ensuring that the stator slot width Bs, the conductor diameter d in the winding, the number of conductors in any winding n, and the number of parallel-connected coil branches a in each phase winding satisfy 0.42≤(Bs / d×10) 4 If (n / a) ≤ 2.2, the radial air gap magnetic flux density Br(a,t) in the air gap can be reduced. Since the radial electromagnetic force density Pr(a,t) is approximately proportional to the square of the radial air gap magnetic flux density Br(a,t), reducing the radial air gap magnetic flux density Br(a,t) can correspondingly reduce the radial electromagnetic force density Pr(a,t), thereby reducing the noise caused by motor excitation and achieving the technical effect of noise reduction for the motor.

[0012] The units for the stator slot width Bs and the conductor diameter d in the winding are millimeters.

[0013] This application limits the relationship between the stator slot width Bs, the diameter d of the conductors in the winding, the number of conductors n in any winding, and the number a of parallel-connected coil branches in each phase winding, so that the above parameters satisfy 0.42≤(Bs / d×10 4 The radial air gap magnetic flux density Br(a,t) is reduced by 2.2, which in turn reduces the radial electromagnetic force density Pr(a,t). This reduces the noise caused by motor excitation and achieves the technical effect of noise reduction for the motor.

[0014] The motor according to the present invention may also have the following distinguishing technical features:

[0015] In the above technical solution, the outer diameter of the stator core is D0, where 50mm≤D0≤60mm.

[0016] In this technical solution, the outer diameter of the stator core is limited. Specifically, the outer diameter of the stator core is D0, which satisfies 50mm≤D0≤60mm. This allows the outer diameter of the stator core to be matched with the slot width Bs of the stator slot, the diameter d of the conductors in the windings, the number of conductors n in any winding, and the number a of parallel-connected coil branches in each phase winding. This reduces the radial air gap magnetic flux density Br(a,t), and consequently reduces the radial electromagnetic force density Pr(a,t). This reduces noise caused by motor excitation, achieving a noise reduction effect on the motor.

[0017] In the above technical solution, the motor further includes: a rotor, a stator including a rotor cavity, the rotor and stator being coaxially disposed within the rotor cavity, the rotor including a rotor core, the rotor core including: a body; multiple magnet slots, the multiple magnet slots being disposed along the circumference of the rotor on the body, the maximum width of any magnet slot being Dm; the rotor also includes multiple magnets, any magnet being disposed within a corresponding magnet slot, the width of the magnet being H, the thickness of the magnet being S; the minimum inner diameter of the stator core being D1, the maximum outer diameter of the rotor core being D2, wherein Dm, H, S, D1 and D2 satisfy 1.25≤H×S / Dm×(D1-D2)≤2.5.

[0018] In this technical solution, the structure of the motor is further defined. The motor also includes a rotor, which is coaxially arranged with the stator. Specifically, the stator includes a rotor cavity, and the rotor is coaxially arranged within the rotor cavity, allowing the rotor to rotate relative to the stator. Furthermore, the structure of the rotor is defined. The rotor includes a rotor core, which comprises multiple rotor laminations stacked to form the rotor core. The rotor laminations can be made of silicon steel sheets. The maximum outer diameter of the rotor core is D2.

[0019] Furthermore, the rotor core includes a body, in which multiple magnet slots are provided. The magnet slots can easily accommodate magnets. The multiple magnet slots are arranged in the body along the circumference of the rotor. The magnet slots can be configured to have a structure in which the width of the cross-section changes along the circumference of the rotor, or they can be configured to have a structure in which the cross-section remains unchanged along the circumference of the rotor. The maximum width of any magnet slot is Dm.

[0020] Furthermore, the rotor also includes multiple magnets. The number of magnets and the number of magnet slots can be the same or different, with each magnet installed in its corresponding slot. Specifically, the magnets are used to form magnetic lines of force. As the rotor rotates relative to the stator, the windings cut these magnetic lines of force to enable the motor to operate normally. The width of the magnet is H, and the thickness of the magnet is S.

[0021] Furthermore, the radial electromagnetic force density in the air gap is related to the maximum width Dm of the magnet slot, the width H of the magnet, the thickness S of the magnet, the minimum inner diameter D1 of the stator core, and the maximum outer diameter D2 of the rotor core. Specifically, Dm, H, S, D1, and D2 satisfy 1.25 ≤ H × S / Dm × (D1 - D2) ≤ 2.5. By ensuring that the maximum width Dm of the magnet slot, the width H of the magnet, the thickness S of the magnet, the minimum inner diameter D1 of the stator core, and the maximum outer diameter D2 of the rotor core satisfy 1.25 ≤ H × S / Dm × (D1 - D2) ≤ 2.5, the radial air gap magnetic flux density Br(a, t) can be reduced. Since the radial electromagnetic force density Pr(a,t) is approximately proportional to the square of the radial air gap magnetic flux density Br(a,t), by reducing the radial air gap magnetic flux density Br(a,t), the radial electromagnetic force density Pr(a,t) can be reduced accordingly, thereby reducing the noise caused by motor excitation and achieving the technical effect of noise reduction for the motor.

[0022] The units for the maximum width Dm of the magnet slot, the width H of the magnet, the thickness S of the magnet, the minimum inner diameter D1 of the stator core, and the maximum outer diameter D2 of the rotor core are millimeters.

[0023] This application limits the relationship between the maximum width Dm of the magnet slot, the width H of the magnet, the thickness S of the magnet, the minimum inner diameter D1 of the stator core, and the maximum outer diameter D2 of the rotor core, so that the above parameters satisfy 1.25≤H×S / Dm×(D1-D2)≤2.5, thereby reducing the radial air gap magnetic flux density Br(a,t), and further reducing the radial electromagnetic force density Pr(a,t). In this way, the noise caused by motor excitation can be reduced, achieving the technical effect of noise reduction for the motor.

[0024] In the above technical solution, D0, D1, H and S further satisfy 0.04≤(D1 / D0) / (H×S)≤0.085.

[0025] In this technical solution, the relationships between the outer diameter D0 of the stator core, the minimum inner diameter D1 of the stator core, the width H of the magnet, and the thickness S of the magnet are defined. Specifically, D0, D1, H, and S satisfy 0.04 ≤ (D1 / D0) / (H×S) ≤ 0.085. This allows the outer diameter D0 of the stator core, the minimum inner diameter D1 of the stator core, the width H of the magnet, and the thickness S of the magnet to be mutually compatible, thereby reducing the radial air gap magnetic flux density Br(a,t), and consequently reducing the radial electromagnetic force density Pr(a,t). This reduces noise caused by motor excitation, achieving a noise reduction effect on the motor.

[0026] The units for the outer diameter D0 of the stator core, the minimum inner diameter D1 of the stator core, the width H of the magnet, and the thickness S of the magnet are millimeters.

[0027] In the above technical solution, furthermore, multiple magnets are evenly distributed on the body along the circumference of the rotor.

[0028] In this technical solution, the distribution of multiple magnets is further defined. Specifically, multiple magnets are evenly distributed along the circumference of the rotor body, and correspondingly, multiple magnet slots are also evenly distributed along the circumference of the rotor body. The number of magnets and magnet slots can be the same or different, with each magnet installed in a corresponding magnet slot. When the number of magnets and magnet slots is the same, multiple magnets and multiple magnet slots correspond one-to-one. When the number of magnets and magnet slots is different, some magnet slots are left empty, and the magnets are evenly distributed along the circumference of the rotor in their respective magnet slots. By evenly distributing multiple magnets along the circumference of the rotor body, the magnetic lines of force formed by the multiple magnets can be uniformly distributed along the circumference of the rotor, enabling the motor to operate stably and improving its performance.

[0029] In the above technical solution, the number of stator teeth is Q, the number of magnetic pole pairs of the magnet is P, and the number of phases of the motor is m, wherein Q, m and P satisfy Q / 2mP < 1.

[0030] In this technical solution, the motor is further defined. Specifically, the number of stator teeth is Q, the number of magnets is 2P, each pair of magnets forms a pair, the number of pole pairs of the magnets is P, and the number of phases of the motor is m, where Q, m, and P satisfy Q / 2mP < 1. This allows the number of stator teeth Q, the number of pole pairs of the magnets P, and the number of phases of the motor to be mutually matched, thereby reducing the radial air gap magnetic flux density Br(a,t), and further reducing the radial electromagnetic force density Pr(a,t). This reduces the noise caused by motor excitation, achieving a noise reduction effect on the motor.

[0031] In one possible technical solution, the motor structure unit motor is a 3-slot 2-pole motor. Under this constraint, fractional slot motors such as 6-slot 4-pole, 9-slot 6-pole, and 12-slot 8-pole can be formed, thereby effectively weakening the high-order harmonic potential generated by the non-sinusoidal distribution of the magnetic field of the magnetic poles and improving the waveform.

[0032] In the above technical solution, the remanence of the magnet is greater than or equal to 1.29T.

[0033] In this technical solution, the remanence of the magnets is limited. Specifically, the remanence of the magnets is greater than or equal to 1.29T, so that the magnetic lines of force generated by each magnet can meet the performance requirements of the motor. In one possible technical solution, the magnets are made of neodymium iron boron, so that the remanence of the magnets can meet the performance requirements of the motor.

[0034] A second aspect of the invention also provides a compressor comprising the motor proposed in the first aspect of the invention.

[0035] The compressor provided in the second aspect of the present invention, having the motor proposed in the first aspect of the present invention, has all the beneficial effects of a motor.

[0036] The compressor includes a housing, and the housing contains a mounting cavity, in which the motor is mounted.

[0037] A third aspect of the invention also provides a refrigeration device comprising the motor proposed in the first aspect of the invention, or the compressor proposed in the second aspect of the invention.

[0038] The refrigeration equipment provided in the third aspect of the present invention, having the motor proposed in the first aspect of the present invention or the compressor proposed in the second aspect of the present invention, has all the beneficial effects of the motor or the compressor.

[0039] The refrigeration equipment includes a housing, and the motor or compressor is installed inside the housing.

[0040] Refrigeration equipment can include refrigerators, freezers, air conditioners, refrigeration units, first-aid kits, or beer kegs, etc.

[0041] Additional aspects and advantages of the invention will become apparent in the following description or may be learned by practice of the invention. Attached Figure Description

[0042] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0043] Figure 1 One of the schematic diagrams of a motor according to an embodiment of the present invention is shown;

[0044] Figure 2 One of the schematic diagrams of the rotor core according to an embodiment of the present invention is shown;

[0045] Figure 3 One of the structural schematic diagrams of a stator core according to an embodiment of the present invention is shown;

[0046] Figure 4 A second schematic diagram of the structure of a motor according to an embodiment of the present invention is shown;

[0047] Figure 5 A second schematic diagram of the rotor core structure according to an embodiment of the present invention is shown;

[0048] Figure 6 A second schematic diagram of the stator core structure according to an embodiment of the present invention is shown;

[0049] Figure 7A comparison graph showing the noise values ​​generated by a motor according to an embodiment of the present invention and a motor in the prior art at different frequencies is provided.

[0050] in, Figures 1 to 6 The correspondence between the reference numerals and component names in the attached drawings is as follows:

[0051] 100 Motor, 120 Stator, 121 Stator Core, 122 Stator Gear, 123 Stator Slot, 124 Rotor Cavity, 130 Rotor, 131 Rotor Core, 132 Body, 133 Magnet Slot, 134 Magnet. Detailed Implementation

[0052] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0053] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0054] The following reference Figures 1 to 7 The invention describes a motor 100, a compressor, and a refrigeration device provided according to some embodiments of the invention.

[0055] In one embodiment according to this application, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, in a first aspect, the present invention provides a motor 100, comprising: a stator 120, including a stator core 121, the stator core 121 including: a plurality of stator teeth 122, the plurality of stator teeth 122 being arranged circumferentially, and any two adjacent stator teeth 122 forming a stator slot 123; the stator 120 further includes a plurality of windings, the plurality of windings being respectively disposed on the plurality of stator teeth 122, each winding including a plurality of wires; the slot width of the stator slot 123 is Bs, the number of wires in any winding is n, each phase winding including a parallel connected coil branches, the diameter of the wires being d, wherein Bs, n, a and d satisfy 0.42≤(Bs / d×10 4 )×(n / a)≤2.2.

[0056] The motor 100 proposed in this application includes a stator 120, which includes a stator core 121. The stator core 121 includes multiple stator laminations, which are stacked to form the stator core 121. The stator laminations can be made of silicon steel sheets. Further, the stator core 121 includes multiple stator teeth 122, which are arranged circumferentially. Any two adjacent stator teeth 122 form a stator slot 123, which is evenly distributed circumferentially around the stator core 121. The minimum inner diameter of the stator core 121 is D1.

[0057] Furthermore, the stator 120 also includes multiple windings, each of which includes multiple wires. The multiple windings are respectively arranged on multiple stator teeth 122 by winding or embedding, so that the windings are located in the stator slots 123.

[0058] Furthermore, the noise of the motor 100 is related to the radial electromagnetic force density in the air gap of the motor 100. Specifically, the radial electromagnetic force density Pr(a,t) is related to the vacuum permeability μ0 and the radial air gap magnetic flux density Br(a,t). The radial electromagnetic force is approximately proportional to the square of the radial electromagnetic force density in the air gap, that is, the relationship between the three is approximately Pr(a,t)≈1 / 2μ0×Br2(a,t). Therefore, under the same air gap, by reasonably adjusting the radial electromagnetic force density in the air gap, the radial electromagnetic force can be reduced, thereby reducing the noise caused by the excitation of the motor 100, that is, the carrier frequency noise.

[0059] Furthermore, the radial electromagnetic force density in the air gap is related to the slot width Bs of the stator slot 123, the diameter d of the conductors in the winding, the number of conductors n in any winding, and the number a of parallel-connected coil branches in each phase winding. Specifically, Bs, n, a, and d satisfy 0.42 ≤ (Bs / d × 10) 4 )×(n / a)≤2.2. By ensuring that the slot width Bs of stator slot 123, the diameter d of the conductors in the winding, the number of conductors in any winding is n, and the number of parallel connected coil branches in each phase winding is a, 0.42≤(Bs / d×10) 4 If (n / a) ≤ 2.2, the radial air gap magnetic flux density Br(a,t) can be reduced. Since the radial electromagnetic force density Pr(a,t) is approximately proportional to the square of the radial air gap magnetic flux density Br(a,t), reducing the radial air gap magnetic flux density Br(a,t) can correspondingly reduce the radial electromagnetic force density Pr(a,t), thereby reducing the noise caused by the excitation of the motor 100, achieving the technical effect of noise reduction for the motor 100.

[0060] The slot width Bs of stator slot 123 and the diameter d of the conductor in the winding are in millimeters.

[0061] This application limits the relationship between the slot width Bs of the stator slot 123, the diameter d of the conductors in the winding, the number of conductors n in any winding, and the number a of parallel-connected coil branches in each phase winding, so that the above parameters satisfy 0.42≤(Bs / d×10 4 The radial air gap magnetic flux density Br(a,t) is reduced by 2.2, which in turn reduces the radial electromagnetic force density Pr(a,t). This reduces the noise caused by the excitation of the motor 100, thus achieving the technical effect of noise reduction of the motor 100.

[0062] In one embodiment of this application, the outer diameter of the stator core 121 is D0, where 50mm ≤ D0 ≤ 60mm.

[0063] In this technical solution, the outer diameter of the stator core 121 is limited. Specifically, the outer diameter of the stator core 121 is D0, where D0 satisfies 50mm≤D0≤60mm. This allows the outer diameter of the stator core 121 to be compatible with the slot width Bs of the stator slot 123, the diameter d of the conductors in the windings, the number of conductors n in any winding, and the number a of parallel-connected coil branches in each phase winding. This reduces the radial air gap magnetic flux density Br(a,t), and consequently reduces the radial electromagnetic force density Pr(a,t). This reduces the noise caused by the excitation of the motor 100, achieving a noise reduction effect on the motor 100.

[0064] In one embodiment according to this application, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, the motor 100 further includes: a rotor 130, a stator 120 including a rotor cavity 124, the rotor 130 and the stator 120 being coaxially disposed within the rotor cavity 124, the rotor 130 including a rotor core 131, the rotor core 131 including: a body 132; multiple magnet slots 133, the multiple magnet slots 133 being disposed along the circumference of the rotor 130 within the body 132, the maximum width of any magnet slot 133 being Dm; multiple magnets 134, any magnet 134 being disposed within a corresponding magnet slot 133, the width of the magnet 134 being H, and the thickness of the magnet 134 being S; the minimum inner diameter of the stator core 121 being D1, and the maximum outer diameter of the rotor core 131 being D2, wherein Dm, H, S, D1 and D2 satisfy 1.25≤H×S / Dm×(D1-D2)≤2.5.

[0065] In this technical solution, the structure of the motor 100 is further defined. The motor 100 also includes a rotor 130, which is coaxially arranged with the stator 120. Specifically, the stator 120 includes a rotor cavity 124, and the rotor 130 is coaxially arranged with the stator 120 within the rotor cavity 124, allowing the rotor 130 to rotate relative to the stator 120. Furthermore, the structure of the rotor 130 is defined. The rotor 130 includes a rotor core 131, which comprises multiple rotor laminations. These multiple rotor laminations are stacked to form the rotor core 131, and the rotor laminations can be made of silicon steel sheets. The maximum outer diameter of the rotor core 131 is D2.

[0066] Furthermore, the rotor core 131 includes a body 132, in which a plurality of magnet slots 133 are provided. The magnet slots 133 can easily accommodate magnets 134. The plurality of magnet slots 133 are arranged in the body 132 along the circumference of the rotor 130. The magnet slots 133 can be configured to have a structure in which the width of the cross-section changes along the circumference of the rotor 130, or they can be configured to have a structure in which the cross-section remains unchanged along the circumference of the rotor 130. The maximum width of any magnet slot 133 is Dm.

[0067] Furthermore, the rotor core 131 also includes multiple magnets 134. The number of magnets 134 can be the same as or different from the number of magnet slots 133, with each magnet 134 installed in a corresponding magnet slot 133. Specifically, the magnets 134 are used to form magnetic lines of force. During the rotation of the rotor 130 relative to the stator 120, the windings cut the magnetic lines of force to enable the motor 100 to operate normally. The width of each magnet 134 is H, and the thickness of each magnet 134 is S.

[0068] Furthermore, the radial electromagnetic force density in the air gap is related to the maximum width Dm of the magnet slot 133, the width H of the magnet 134, the thickness S of the magnet 134, the minimum inner diameter D1 of the stator core 121, and the maximum outer diameter D2 of the rotor core 131. Specifically, Dm, H, S, D1, and D2 satisfy 1.25 ≤ H × S / Dm × (D1 - D2) ≤ 2.5. By ensuring that the maximum width Dm of the magnet slot 133, the width H of the magnet 134, the thickness S of the magnet 134, the minimum inner diameter D1 of the stator core 121, and the maximum outer diameter D2 of the rotor core 131 satisfy 1.25 ≤ H × S / Dm × (D1 - D2) ≤ 2.5, the radial air gap magnetic flux density Br(a, t) can be reduced. Since the radial electromagnetic force density Pr(a,t) is approximately proportional to the square of the radial air gap magnetic flux density Br(a,t), by reducing the radial air gap magnetic flux density Br(a,t), the radial electromagnetic force density Pr(a,t) can be reduced accordingly, thereby reducing the noise caused by the excitation of the motor 100 and achieving the technical effect of noise reduction of the motor 100.

[0069] The units for the maximum width Dm of the magnet slot 133, the width H of the magnet 134, the thickness S of the magnet 134, the minimum inner diameter D1 of the stator core 121, and the maximum outer diameter D2 of the rotor core 131 are millimeters.

[0070] This application limits the relationship between the maximum width Dm of the magnet slot 133, the width H of the magnet 134, the thickness S of the magnet 134, the minimum inner diameter D1 of the stator core 121, and the maximum outer diameter D2 of the rotor core 131, so that the above parameters satisfy 1.25≤H×S / Dm×(D1-D2)≤2.5, thereby reducing the radial air gap magnetic flux density Br(a,t), and further reducing the radial electromagnetic force density Pr(a,t). In this way, the noise caused by the excitation of the motor 100 can be reduced, achieving the technical effect of noise reduction of the motor 100.

[0071] In one embodiment according to this application, D0, D1, H and S satisfy 0.04≤(D1 / D0) / (H×S)≤0.085.

[0072] In this technical solution, the relationships between the outer diameter D0 of the stator core 121, the minimum inner diameter D1 of the stator core 121, the width H of the magnet 134, and the thickness S of the magnet 134 are defined. Specifically, D0, D1, H, and S satisfy 0.04≤(D1 / D0) / (H×S)≤0.085. This allows the outer diameter D0 of the stator core 121, the minimum inner diameter D1 of the stator core 121, the width H of the magnet 134, and the thickness S of the magnet 134 to be mutually compatible, thereby reducing the radial air gap magnetic flux density Br(a,t) and consequently reducing the radial electromagnetic force density Pr(a,t). This reduces the noise caused by the excitation of the motor 100, achieving a noise reduction effect on the motor 100.

[0073] The units for the outer diameter D0 of the stator core 121, the minimum inner diameter D1 of the stator core 121, the width H of the magnet 134, and the thickness S of the magnet 134 are millimeters.

[0074] In one embodiment according to this application, such as Figure 2 and Figure 5 As shown, multiple magnets 134 are evenly distributed on the body 132 along the circumference of the rotor 130.

[0075] In this technical solution, the distribution of the multiple magnets 134 is further defined. Specifically, the multiple magnets 134 are evenly distributed along the circumference of the rotor 130 on the body 132, and correspondingly, the multiple magnet slots 133 are also evenly distributed along the circumference of the rotor 130 on the body 132. The number of magnets 134 and magnet slots 133 can be the same or different, and each magnet 134 is installed in a corresponding magnet slot 133. When the number of magnets 134 and magnet slots 133 is the same, the multiple magnets 134 and the multiple magnet slots 133 correspond one-to-one. When the number of magnets 134 and magnet slots 133 is different, some magnet slots 133 are left empty, and the magnets 134 are evenly distributed along the circumference of the rotor 130 in the corresponding magnet slots 133. By evenly distributing multiple magnets 134 along the circumference of the rotor 130 on the body 132, the magnetic lines of force formed by the multiple magnets 134 can be evenly distributed along the circumference of the rotor 130, so that the motor 100 can operate stably and improve the performance of the motor 100.

[0076] In one embodiment according to this application, the number of stator teeth 122 is Q, the number of pole pairs of magnet 134 is P, and the number of phases of motor 100 is m, wherein Q, m, and P satisfy Q / 2mP < 1.

[0077] In this technical solution, the motor 100 is further defined. Specifically, the number of stator teeth 122 is Q, the number of magnets 134 is 2P, each pair of magnets 134 constitutes a pair of magnets 134, the number of pole pairs of magnets 134 is P, and the number of phases of the motor 100 is m, where Q, m, and P satisfy Q / 2mP < 1. In this way, the number of stator teeth 122 Q, the number of pole pairs of magnets 134 P, and the number of phases of the motor 100 can be matched with each other, thereby reducing the radial air gap magnetic flux density Br(a,t), and further reducing the radial electromagnetic force density Pr(a,t). Thus, the noise caused by the excitation of the motor 100 can be reduced, achieving the technical effect of noise reduction of the motor 100.

[0078] In one possible technical solution, the motor 100 structural unit motor 100 has 3 slots and 2 poles. Under this constraint, it is possible to form a fractional slot motor 100 with 6 slots and 4 poles, 9 slots and 6 poles, 12 slots and 8 poles, etc., thereby effectively weakening the high-order harmonic potential generated by the non-sinusoidal distribution of the magnetic field of the magnetic poles and improving the waveform.

[0079] In one embodiment according to this application, the remanence of magnet 134 is greater than or equal to 1.29T.

[0080] In this technical solution, the remanence of the magnet 134 is limited. Specifically, the remanence of the magnet 134 is greater than or equal to 1.29T, so that the magnetic lines of force generated by each magnet 134 can meet the performance requirements of the motor 100. In one possible technical solution, the material used for the magnet 134 is neodymium iron boron, so that the remanence of the magnet 134 can meet the performance requirements of the motor 100.

[0081] In one embodiment of this application, the noise generated by the motor 100 provided in this application and a motor in the prior art under different frequency operating conditions is compared as follows: Figure 7 As shown. In Figure 7 In the graph, the horizontal axis represents different frequencies, and the vertical axis represents the noise level in decibels. At the same frequency, if the noise generated by the motor 100 proposed in this application is greater than the noise of a motor in the prior art (i.e., a motor in related technology), the corresponding change in the bar chart is a deterioration; if the noise generated by the motor 100 proposed in this application is less than the noise of a motor in the prior art, the corresponding change in the bar chart is an improvement. Figure 7 It is clearly visible that, compared with the motors in the prior art, the noise generated by the motor 100 proposed in this application is significantly reduced.

[0082] A second aspect of the invention also provides a compressor comprising the motor 100 proposed in the first aspect of the invention.

[0083] The compressor provided in the second aspect of the present invention, having the motor 100 proposed in the first aspect of the present invention, has all the beneficial effects of the motor 100.

[0084] The compressor includes a housing, and the housing includes a mounting cavity, in which the motor 100 is mounted.

[0085] A third aspect of the present invention also provides a refrigeration device, comprising the motor 100 proposed in the first aspect of the present invention, or the compressor proposed in the second aspect of the present invention.

[0086] The refrigeration equipment provided in the third aspect of the present invention, having the motor 100 proposed in the first aspect of the present invention or the compressor proposed in the second aspect of the present invention, has all the beneficial effects of the motor 100 or the compressor.

[0087] The refrigeration equipment includes a housing, and a motor 100 or a compressor is installed inside the housing.

[0088] Refrigeration equipment can include refrigerators, freezers, air conditioners, refrigeration units, first-aid kits, or beer kegs, etc.

[0089] In this invention, the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "install," "connect," "link," and "fix" should be interpreted broadly. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "link" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0090] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0091] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An electric motor, characterized in that, include: Stator, including stator core, wherein the stator core comprises: Multiple stator teeth are arranged circumferentially, and any two adjacent stator teeth form a stator slot; The stator further includes multiple windings, which are respectively disposed on the multiple stator teeth, and each winding includes multiple wires; The stator slot has a slot width of Bs, the number of conductors in any winding is n, each phase winding includes a parallel-connected coil branches, and the diameter of the conductor is d, where Bs, n, a, and d satisfy 0.42 ≤ (Bs / d × 10) 4 )×(n / a)≤2.

2.

2. The motor according to claim 1, characterized in that, The outer diameter of the stator core is D0, where 50mm ≤ D0 ≤ 60mm.

3. The motor according to claim 1, characterized in that, Also includes: The rotor, the stator including a rotor cavity, the rotor and the stator coaxially disposed within the rotor cavity, the rotor including a rotor core, the rotor core including: ontology; Multiple magnet slots are provided on the body along the circumference of the rotor, and the maximum width of any one of the magnet slots is Dm; The rotor also includes a plurality of magnets, each of which is disposed in a corresponding magnet slot, the width of the magnet being H and the thickness of the magnet being S; The minimum inner diameter of the stator core is D1, and the maximum outer diameter of the rotor core is D2. Dm, H, S, D1 and D2 satisfy 1.25≤H×S / Dm×(D1-D2)≤2.

5.

4. The motor according to claim 3, characterized in that, D0, D1, H and S satisfy 0.04≤(D1 / D0) / (H×S)≤0.

085.

5. The motor according to claim 3, characterized in that, The plurality of magnets are evenly distributed on the body along the circumference of the rotor.

6. The motor according to claim 3, characterized in that, The number of stator teeth is Q, the number of magnetic pole pairs of the magnet is P, and the number of phases of the motor is m, wherein Q, m, and P satisfy Q / 2mP < 1.

7. The motor according to any one of claims 3 to 6, characterized in that, The remanence of the magnet is greater than or equal to 1.29T.

8. A compressor, characterized in that, include: The motor as described in any one of claims 1 to 7.

9. A refrigeration device, characterized in that, include: The motor as described in any one of claims 1 to 7; or The compressor as described in claim 8.

10. The refrigeration equipment according to claim 9, characterized in that, The refrigeration equipment may be a refrigerator, freezer, air conditioner, refrigeration unit, first-aid kit, or beer keg.

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