Rotor assembly of motor, motor and electric appliance

Abstract

The invention discloses a rotor assembly of a motor, the motor and an electric appliance, and belongs to the technical field of electrical equipment. The rotor assembly of the motor comprises a rotor support, and the inner circumferential wall of the rotor support is provided with a plurality of installation positions which are uniformly spaced along the circumferential direction of the rotor assembly; the plurality of rotor core bodies are mounted at the plurality of mounting positions in a one-to-one correspondence manner, and a rotor groove is defined between every two adjacent rotor core bodies; the permanent magnets are installed in the rotor grooves, and the radial inner ends, along the rotor assembly, of the multiple rotor core bodies and the radial inner ends, along the rotor assembly, of the permanent magnets jointly define a containing cavity used for installing the stator assembly. According to the rotor assembly of the motor provided by the invention, the plurality of rotor cores are arranged outside the stator assembly and the permanent magnets are arranged between the two adjacent rotor cores, so that the outer diameter of the rotor cores can be increased, the magnetic load can be increased, the output power of the motor can be increased, the power density can be improved, and meanwhile, the air gap zone area can be increased; and the air gap magnetic flux is improved.

Description

Technical Field

[0001] The present application belongs to the technical field of electrical equipment, and in particular, relates to a rotor assembly of a motor, a motor and an electrical appliance. Background Art

[0002] The motor is usually provided with a rotor assembly, and the rotor assembly has a variety of arrangements. However, the outer diameter of the rotor core in the current rotor assembly is relatively small, resulting in a smaller magnetic load of the motor, and thus resulting in a lower output power of the motor. Summary of the invention

[0003] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a rotor assembly of a motor, a motor and an electrical appliance, which can increase the outer diameter of the rotor core to increase the magnetic load, thereby helping to increase the output power of the motor and improve the power density, and at the same time increase the air gap area and improve the air gap magnetic flux.

[0004] In a first aspect, the present application provides a rotor assembly of a motor, comprising:

[0005] A rotor support, wherein the inner peripheral wall of the rotor support is provided with a plurality of mounting positions evenly spaced apart along the circumference of the rotor assembly;

[0006] A plurality of rotor cores, the plurality of rotor cores are mounted in the plurality of mounting positions in a one-to-one correspondence, and a rotor slot is defined between two adjacent rotor cores;

[0007] A permanent magnet is installed in the rotor slot, and the plurality of rotor cores along the radial inner end of the rotor assembly and the permanent magnet along the radial inner end of the rotor assembly jointly define an accommodating cavity for installing a stator assembly.

[0008] According to the rotor assembly of the motor provided in the embodiment of the present application, by arranging multiple rotor cores outside the stator assembly and installing permanent magnets between two adjacent rotor cores, the outer diameter of the rotor core can be increased to increase the magnetic load, which can help increase the output power of the motor and improve the power density. At the same time, the air gap area can be increased and the air gap magnetic flux can be improved.

[0009] According to one embodiment of the present application, the magnetic pole direction of the permanent magnet is perpendicular to the central axis of the rotor slot, and the central axis of the rotor slot passes through the center of the rotor assembly.

[0010] According to one embodiment of the present application, the rotor core has an arc segment along the radial inner end of the rotor assembly, the center of curvature of the arc segment is arranged inward, and the center of curvature of the arc segment coincides with the central axis of the rotor core.

[0011] According to one embodiment of the present application, the radius of the arc segment is R1, and the distance from the center of curvature of the arc segment to the center origin is H1, satisfying: 1.3≤R1 / H1≤2.

[0012] According to one embodiment of the present application, the permanent magnet has an arc-shaped segment at the radial inner end along the circumferential side wall of the rotor assembly, and the center of curvature of the arc-shaped segment is arranged outward.

[0013] According to an embodiment of the present application, one of the radial outer end of the rotor core and the mounting position is provided with a positioning groove, and the other is provided with a positioning protrusion, and the positioning protrusion is positioned and matched with the positioning groove.

[0014] According to an embodiment of the present application, the positioning groove includes a main groove that is in contact with the positioning protrusion and a countersunk groove provided at the bottom of the main groove.

[0015] According to one embodiment of the present application, the height of the rotor core along the axial direction is H2, which satisfies: 9mm≤H2≤22mm.

[0016] In a second aspect, an embodiment of the present application provides a motor, the motor comprising:

[0017] chassis;

[0018] A rotor assembly as described in any of the above embodiments;

[0019] A stator assembly is installed in the accommodating cavity of the rotor assembly.

[0020] According to one embodiment of the present application, the stator core of the stator assembly includes a plurality of stator teeth spaced apart and distributed circumferentially, the stator teeth extend radially, and the radial outer ends of the stator teeth have tooth shoulders extending circumferentially, and the tooth shoulders are provided with magnetic blocking holes.

[0021] According to an embodiment of the present application, each of the tooth shoulders is provided with a plurality of the magnetic blocking holes which are arranged circumferentially and spaced apart from each other.

[0022] According to one embodiment of the present application, the housing includes:

[0023] a base, the stator assembly being mounted on the base;

[0024] A protective cover is connected to the base, and the motor shaft of the rotor assembly passes through the protective cover.

[0025] According to one embodiment of the present application, the height of the housing along the axial direction of the motor is H3, which satisfies: 38mm≤H3≤70mm.

[0026] According to the motor provided in the embodiment of the present application, by adopting any of the above-mentioned rotor assemblies, the outer diameter of the rotor core can be increased to increase the magnetic load, which can help increase the output power of the motor and improve the power density. At the same time, the air gap area can be increased and the air gap magnetic flux can be improved.

[0027] In a third aspect, the present application provides an electrical appliance, the electrical appliance comprising:

[0028] power supply;

[0029] For the motor as described in any of the above embodiments, the input end of the motor is electrically connected to the power supply.

[0030] According to the electrical appliance provided in the embodiments of the present application, by adopting any of the above-mentioned motors, the outer diameter of the rotor core can be increased to increase the magnetic load, which can help increase the output power of the motor and improve the power density. At the same time, the air gap area can be increased to improve the air gap magnetic flux.

[0031] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0033] Figure 1 is a schematic structural diagram of a rotor assembly of a motor provided in an embodiment of the present application;

[0034] Figure 2 is a schematic diagram of the assembly of a rotor assembly and a stator assembly of a motor provided in an embodiment of the present application;

[0035] Figure 3 yes Figure 1 A partial enlarged view of the middle A;

[0036] Figure 4 is a cross-sectional view of a motor provided in an embodiment of the present application;

[0037] Figure 5 is a back electromotive force data diagram of a comparative example;

[0038] Figure 6 This is a back-electromotive force data diagram of a motor having a rotor assembly provided in an embodiment of the present application.

[0039] Reference numerals:

[0040] Rotor assembly 100, rotor core 110, positioning groove 111, main groove 1111, sink groove 1112, arc segment 112, rotor bracket 120, positioning protrusion 121, center hole 122, motor shaft 130, rotor groove 140;

[0041] Stator assembly 200, stator teeth 210, tooth shoulders 211, magnetic blocking holes 212;

[0042] Housing 300, protective cover 310, base 320;

[0043] Bearing 400 , gasket 500 , arc-shaped segment 600 . DETAILED DESCRIPTION

[0044] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0045] Reference below Figure 1-Figure 4 A rotor assembly 100 of a motor, a motor, and an electrical appliance according to embodiments of the present application are described.

[0046] The present application embodiment provides a rotor assembly 100 of a motor, such as Figure 1 and Figure 2 As shown, the rotor assembly 100 of the motor includes a rotor support 120 , a plurality of rotor cores 110 and permanent magnets.

[0047] Among them, Figure 1 and Figure 2 As shown, the rotor assembly 100 further includes a motor shaft 130 . The rotor support 120 is provided with a central hole 122 . The motor shaft 130 is installed in the central hole 122 of the rotor support 120 .

[0048] like Figure 1 As shown, the outer peripheral wall of the rotor bracket 120 may be a circular structure, an elliptical structure or other shaped structures, and the inner peripheral wall of the rotor bracket 120 is a circular structure.

[0049] like Figure 1 As shown, the inner circumferential wall of the rotor bracket 120 is provided with a plurality of mounting positions evenly spaced apart along the circumference of the rotor assembly 100 , a plurality of rotor cores 110 are mounted in the plurality of mounting positions one by one, and a rotor slot 140 is defined between two adjacent rotor cores 110 .

[0050] like Figure 1 and Figure 2As shown, the rotor core 110 may be in a rectangular structure, a trapezoidal structure or other shapes. A plurality of rotor cores 110 are spaced apart along the circumference of the rotor assembly 100 , and a gap is provided between two adjacent rotor cores 110 , which defines a rotor slot 140 .

[0051] like Figure 1 and Figure 2 As shown, the permanent magnets are installed in the rotor slots 140, and the mounting positions can be set to 16 or 20. When the mounting positions are set to 16, the multiple rotor cores 110 define 16 rotor slots 140; when the mounting positions are set to 20, the multiple rotor cores 110 define 20 rotor slots 140, that is, 20 permanent magnets are installed one-to-one in 20 rotor slots 140, or 16 permanent magnets are installed one-to-one in 16 rotor slots 140, which can form better magnetic potential and electric potential waveforms to improve the performance of the motor.

[0052] like Figure 1 and Figure 2 As shown, the plurality of rotor cores 110 along the radial inner end of the rotor assembly 100 and the permanent magnets along the radial inner end of the rotor assembly 100 jointly define an accommodation cavity for installing the stator assembly 200 .

[0053] like Figure 1 and Figure 2 As shown, multiple permanent magnets are installed in a one-to-one correspondence with multiple rotor slots 140, that is, a permanent magnet is provided between two adjacent rotor cores 110, and the radial inner ends of the permanent magnet along the rotor assembly 100 are respectively in contact with the radial inner ends of the two adjacent rotor cores 110 along the rotor assembly 100, so that the radial inner ends of the rotor cores 110 along the rotor assembly 100 and the permanent magnets along the radial inner ends of the rotor assembly 100 form a circumferentially closed accommodating cavity of the rotor assembly 100.

[0054] It can be understood that, when the volume of the motor is the same, the outer diameter of the rotor core 110 is larger when the rotor core 110 is arranged outside the stator assembly 200 than when the stator assembly 200 is arranged outside the rotor core 110. Therefore, setting the rotor core 110 outside the stator assembly 200 can increase the magnetic load, thereby helping to increase the output power of the motor and improve the power density. By arranging multiple rotor cores 110 spaced apart along the circumference of the rotor assembly 100 and permanent magnets are arranged in the rotor slots 140 formed between two adjacent rotor cores 110, the air gap area can be increased and the air gap magnetic flux can be increased.

[0055] According to the rotor assembly 100 of the motor provided in the embodiment of the present application, by arranging multiple rotor cores 110 outside the stator assembly 200 and installing permanent magnets between two adjacent rotor cores 110, the outer diameter of the rotor core 110 can be increased to increase the magnetic load, thereby helping to increase the output power of the motor and improve the power density. At the same time, the air gap area can be increased and the air gap magnetic flux can be improved.

[0056] In some embodiments, Figure 1 As shown, the magnetic pole direction of the permanent magnet is perpendicular to the central axis of the rotor slot 140 , and the central axis of the rotor slot 140 passes through the center of the rotor assembly 100 .

[0057] Among them, Figure 1 As shown, the shape, structure and size of the multiple rotor cores 110 are the same, and each rotor slot 140 is symmetrical in the circumferential direction of the rotor assembly 100. Since the multiple rotor cores 110 are arranged circumferentially spaced around the center of the rotor assembly 100, the center axis of the rotor slot 140 passes through the center of the rotor assembly 100 and extends radially along the rotor assembly 100. The magnetic pole direction of the permanent magnet is perpendicular to the center axis of the rotor slot 140, that is, the magnetic pole direction of the permanent magnet is the tangential direction of the rotor assembly 100, and the magnetic pole directions of two adjacent permanent magnets are opposite.

[0058] By setting the magnetic pole direction of the permanent magnet to be perpendicular to the central axis of the rotor slot 140, each rotor core 110 is magnetized by two adjacent permanent magnets, which can increase the air gap area and improve the air gap magnetic flux.

[0059] In some embodiments, Figure 1 and Figure 2 As shown, the permanent magnet has an arc-shaped segment 600 at the radial inner end along the circumferential side wall of the rotor assembly 100 , and the center of curvature of the arc-shaped segment 600 is arranged outward.

[0060] Among them, Figure 1 and Figure 2 As shown, the permanent magnet as a whole can be presented as a trapezoidal structure, and the permanent magnet is provided with an outwardly protruding arc segment 600 along the circumferential side wall of the rotor assembly 100 near the lower bottom, and the rotor slot 140 defined by two adjacent rotor cores 110 is presented as an inverted trapezoidal structure, and the rotor slot 140 is arranged in the shape of the arc segment 600 along the circumferential side wall of the rotor assembly 100 near the lower bottom.

[0061] like Figure 1 and Figure 2 As shown, the rotor slot 140 can be configured to conform to the overall structure of the permanent magnet. For example, the rotor slot 140 and the permanent magnet are both configured to be an inverted trapezoidal structure, and the radial inner ends of the rotor slot 140 and the permanent magnet along the circumferential side wall of the rotor assembly 100 are both configured to be arc segments 600.

[0062] The rotor slot 140 can also have its radial inner end of the circumferential side wall configured to imitate the arc segment 600 of the permanent magnet. For example, the permanent magnet is configured to have an inverted trapezoidal structure, and the radial inner end of the permanent magnet along the circumferential side wall of the rotor assembly 100 is configured to have the arc segment 600, and the rotor slot 140 can be configured to have a rectangular structure.

[0063] By providing the arc-shaped segment 600 on the permanent magnet, the harmonic content can be reduced, the torque ripple can be lowered, and the motor performance can be improved.

[0064] In some embodiments, the rotor core 110 has an arc segment 112 along the radial inner end of the rotor assembly 100 , the center of curvature of the arc segment 112 is set inward, and the center of curvature of the arc segment 112 coincides with the central axis of the rotor core 110 .

[0065] Among them, the rotor core 110 is a symmetrical structure, that is, the central axis of the rotor core 110 is the symmetry axis of the rotor core 110, the center of curvature of the arc segment 112 falls on the central axis of the rotor core 110, and the arc segments of multiple rotor cores 110 cooperate to present a shape similar to a circle.

[0066] By providing the arc segment 112 on the rotor core 110 , the harmonic content can be reduced, the torque pulsation can be lowered, and the motor performance can be improved.

[0067] In some embodiments, the radius of the arc segment 112 is R1, and the distance from the center of the curvature of the arc segment 112 to the center origin is H1, which satisfies: 1.3≤R1 / H1≤2.

[0068] Among them, the central origin is the center of a circle composed of multiple rotor cores 110. The central origin and the center of curvature of the arc segment 112 are both located on the central axis of the rotor core 110. By limiting the value of R1 / H1, the specific position of the center of curvature of the arc segment 112 can be obtained.

[0069] By limiting 1.3≤R1 / H1≤2, the arc segment 112 can help the motor to reduce harmonic content to a greater extent, help the motor to reduce torque pulsation and improve motor performance.

[0070] like Figure 5 and Figure 6 As shown, Figure 5 is a back electromotive force data diagram of a comparative example; Figure 6 is a back electromotive force data diagram of a motor having a rotor assembly 100 provided in an embodiment of the present application; it can be seen that the motor having the rotor assembly 100 provided in this embodiment is compared with the motor provided in the comparative embodiment, Figure 6 The ratio of m2 and m3 to m1 Figure 5The ratios of m2 and m3 to m1 are respectively small, and the back electromotive force value of the motor having the rotor assembly 100 provided in this embodiment is smaller than the back electromotive force value of the motor provided in the comparative embodiment, which can help reduce harmonic vibration and harmonic loss, and at the same time help reduce the torque pulsation of the motor.

[0071] In some embodiments, Figure 1-Figure 3 As shown, one of the radial outer end and the mounting position of the rotor core 110 is provided with a positioning groove 111 , and the other is provided with a positioning protrusion 121 , and the positioning protrusion 121 is positioned and matched with the positioning groove 111 .

[0072] Among them, Figure 1-Figure 3 As shown, a positioning groove 111 may be provided at the radial outer end of the rotor core 110 and a positioning protrusion 121 may be provided at the mounting position, or a positioning protrusion 121 may be provided at the radial outer end of the rotor core 110 and a positioning groove 111 may be provided at the mounting position.

[0073] like Figure 1-Figure 3 As shown, the width of the positioning groove 111 along the radial outer end of the rotor assembly 100 can be smaller than the width of the positioning groove 111 along the radial inner end of the rotor assembly 100, and the width of the positioning protrusion 121 along the radial outer end of the rotor assembly 100 can be smaller than the width of the positioning protrusion 121 along the radial inner end of the rotor assembly 100.

[0074] During the actual implementation process, when installing the rotor core 110 and the rotor bracket 120, the positioning groove 111 is matched with the positioning protrusion 121 one by one, and the rotor core 110 is moved axially from one axial end of the rotor bracket 120 to the inside of the rotor bracket 120. At this time, the positioning groove 111 and the positioning protrusion 121 are plug-in arranged. Since the width of the positioning groove 111 along the radial outer end of the rotor assembly 100 is smaller than the width of the positioning groove 111 along the radial inner end of the rotor assembly 100, and the width of the positioning protrusion 121 along the radial outer end of the rotor assembly 100 is smaller than the width of the positioning protrusion 121 along the radial inner end of the rotor assembly 100, the positioning groove 111 and the positioning protrusion 121 are snap-fitted in the radial direction of the rotor assembly 100.

[0075] By setting the above-mentioned positioning protrusion 121 and positioning groove 111, the rotor core 110 can be easily installed, and the structure is simple, which can reduce the production cost. By setting the width of the positioning groove 111 along the radial outer end of the rotor assembly 100 to be smaller than the width of the positioning groove 111 along the radial inner end of the rotor assembly 100, and setting the width of the positioning protrusion 121 along the radial outer end of the rotor assembly 100 to be smaller than the width of the positioning protrusion 121 along the radial inner end of the rotor assembly 100, the positioning groove 111 and the positioning protrusion 121 can be snap-fitted in the radial direction of the rotor assembly 100, thereby preventing the rotor core 110 from falling off the rotor bracket 120 when multiple rotor cores 110 are installed in sequence.

[0076] In some embodiments, Figure 3 As shown, the positioning groove 111 includes a main groove 1111 that is in contact with the positioning protrusion 121 and a sink groove 1112 disposed at the bottom of the main groove 1111 .

[0077] Among them, Figure 3 As shown, the bottom of the main groove 1111 can be a plane, or a circular arc surface or other shape structures, and the sink groove 1112 is recessed radially inward relative to the main groove 1111 along the rotor assembly 100. The sink groove 1112 can be a semicircular structure, or a rectangular structure or a groove of other shape structures.

[0078] In the actual implementation process, the positioning protrusion 121 is plugged into the positioning groove 111, and the positioning protrusion 121 is arranged along the radial inner end surface of the rotor assembly 100 and is in contact with the bottom surface of the main groove 1111. The wall surface of the sink groove 1112 has no contact with the positioning protrusion 121. The rotor bracket 120 and the rotor core 110 can be connected and fixed by bonding. When glue is poured between the rotor bracket 120 and the rotor core 110, glue can be poured into the sink groove 1112. The glue can flow to the main groove 1111 through the sink groove 1112 and be located between the wall surface of the main groove 1111 and the outer surface of the positioning protrusion 121, thereby realizing the bonding between the positioning groove 111 and the positioning protrusion 121.

[0079] By configuring the positioning groove 111 to include a main groove 1111 that fits with the positioning protrusion 121 and a sink groove 1112 disposed at the bottom of the main groove 1111, the rotor bracket 120 can be connected to the rotor core 110 by manual glue injection when installing a single or a small number of rotor assemblies 100. The sink groove 1112 reserves a glue injection space for manual glue injection to facilitate the glue to enter between the positioning protrusion 121 and the positioning groove 111, thereby improving work efficiency.

[0080] In some embodiments, the height of the rotor core 110 along the axial direction is H2, satisfying: 9 mm ≤ H2 ≤ 22 mm.

[0081] During actual use, when the rotor core 110 is installed in the motor, it needs to be installed in coordination with other components in the motor. That is, the size of the rotor core 110 will affect the size of some components in the motor that cooperate with the rotor core 110. For example, the larger the size of the rotor core 110, the larger the size of some components; the smaller the size of the rotor core 110, the smaller the size of some components.

[0082] By limiting the axial height H2 of the rotor core 110 to satisfy: 9mm≤H2≤22mm, the thickness of the rotor core 110 can be reduced, thereby reducing the thickness of some components that cooperate with the rotor core 110, and further helping to reduce the overall thickness of the motor, so as to help the motor adapt to narrower or shorter usage scenarios, and at the same time avoid the rotor core 110 being too thin, resulting in low strength and easy damage.

[0083] The present application also provides a motor, such as Figure 2 and Figure 4 As shown, the motor includes a housing 300 , a stator assembly 200 and a rotor assembly 100 as in any of the above embodiments.

[0084] Among them, Figure 2 and Figure 4 As shown, the stator assembly 200 is installed in the accommodating cavity of the rotor assembly 100 , and the housing 300 is installed on the outer periphery of the rotor assembly 100 , that is, the housing 300 wraps the stator assembly 200 and a part of the rotor assembly 100 .

[0085] like Figure 4 As shown, two bearings 400 are provided between the motor shaft 130 and the housing, one of the bearings 400 is installed at the first axial end of the rotor bracket 120, and the other bearing 400 is installed at the second axial end of the rotor bracket 120, and a gasket 500 is provided between the bearing 400 located at the first axial end of the rotor bracket 120 and the housing 300.

[0086] The stator assembly 200 includes a stator core and a winding wound on the stator core.

[0087] According to the motor provided in the embodiment of the present application, by adopting any of the above-mentioned rotor assemblies 100, the outer diameter of the rotor core 110 can be increased to increase the magnetic load, which can help increase the output power of the motor and improve the power density. At the same time, the air gap area can be increased to improve the air gap magnetic flux.

[0088] In some embodiments, Figure 2 As shown, the stator core of the stator assembly 200 includes a plurality of stator teeth 210 spaced apart and distributed circumferentially. The stator teeth 210 extend radially, and radially outer ends of the stator teeth 210 have tooth shoulders 211 extending circumferentially. The tooth shoulders 211 are provided with magnetic blocking holes 212 .

[0089] Among them, Figure 2As shown, the stator tooth 210 can be set as a T-shaped structure, the part of the stator tooth 210 extending outward in the circumferential direction, that is, the part of the stator tooth 210 arranged laterally is the tooth shoulder 211 of the stator tooth 210, the inner ends of multiple stator teeth 210 are connected to present a circular structure, and the center hole 122 of the rotor bracket 120 is located inside the circular structure formed by the stator tooth 210.

[0090] The winding of the stator assembly 200 is wound on the stator teeth 210 , and the magnetic blocking holes 212 may be waist-shaped holes, rectangular holes or holes of other shapes and structures.

[0091] By setting the magnetic blocking holes 212, the distribution of magnetic lines of force can be optimized to increase the magnetic field strength and further reduce torque pulsation.

[0092] In some embodiments, Figure 2 As shown, each tooth shoulder 211 is provided with a plurality of magnetic blocking holes 212 spaced apart from each other in the circumferential direction.

[0093] For example, Figure 2 As shown, each tooth shoulder 211 may be provided with three magnetic blocking holes 212 , the three magnetic blocking holes 212 are arranged spaced apart in the circumferential direction, and two adjacent magnetic blocking holes 212 are arranged in parallel.

[0094] In other embodiments, each tooth shoulder 211 may be provided with four or other numbers of magnetic blocking holes 212 , and the central axes of two adjacent magnetic blocking holes 212 may be arranged to intersect.

[0095] By providing a plurality of magnetic blocking holes 212 spaced apart in the circumferential direction on each tooth shoulder 211 , the distribution of magnetic lines of force can be further changed, the magnetic field strength can be further increased, and the torque pulsation can be reduced.

[0096] In some embodiments, Figure 4 As shown, the housing 300 includes a base 320 and a protective cover 310.

[0097] Among them, Figure 4 As shown, the stator assembly 200 is installed on the base 320, the rotor assembly 100 is installed on the outer periphery of the stator assembly 200, the protective cover 310 is installed on the outer periphery of the rotor assembly 100, the protective cover 310 is connected to the base 320, and the motor shaft 130 of the rotor assembly 100 passes through the protective cover 310. The protective cover 310 is also provided with a mounting hole at a position corresponding to the center hole 122 of the rotor bracket 120. One end of the motor shaft 130 passes through the center hole 122 and the mounting hole in sequence and is located outside the casing 300.

[0098] The connection methods between the protective cover 310 and the base 320 include, but are not limited to, threaded connection, bonding or snap connection, etc., and threaded connection is preferably selected to improve the connection strength between the protective cover 310 and the base 320.

[0099] By configuring the housing 300 to include a base 320 and a protective cover 310, dust or other impurities can be prevented from entering the interior of the motor and causing adverse effects on internal components, thereby extending the service life of the motor. Dividing the housing 300 into a base 320 and a protective cover 310 can facilitate the installation of the stator assembly 200, the rotor assembly 100 and other structures.

[0100] In some embodiments, the height of the housing 300 along the axial direction of the motor is H3, which satisfies: 38mm≤H3≤70mm.

[0101] Among them, the casing 300 wraps the rotor assembly 100 and the stator assembly 200, so the axial height of the motor excluding the motor shaft 130 is the distance between the two end faces of the casing 300 along the axial direction of the motor. If the height of the casing 300 along the axial direction of the motor is reduced, the height of the rotor assembly 100 and the stator assembly 200 in the axial direction of the motor also needs to be reduced.

[0102] By limiting the height H3 of the housing 300 along the motor axis to satisfy: 38mm≤H3≤70mm, the overall thickness of the motor can be reduced while preventing the rotor assembly 100 and the stator assembly 200 from being too thin and insufficient in strength due to the reduced thickness of the housing 300.

[0103] An embodiment of the present application further provides an electrical appliance, comprising a power supply and a motor as in any of the above embodiments, wherein an input end of the motor is electrically connected to the power supply.

[0104] Electrical appliances may include but are not limited to microwave ovens, induction cookers, electric ovens, dishwashers, etc.

[0105] According to the electrical appliance provided in the embodiment of the present application, by adopting any of the above-mentioned motors, the outer diameter of the rotor core 110 can be increased to increase the magnetic load, which can help increase the output power of the motor and improve the power density. At the same time, the air gap area can be increased to improve the air gap magnetic flux.

[0106] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0107] In the description of the present application, it should be understood that the terms "width", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0108] In the description of this application, "first feature" or "second feature" may include one or more of the features.

[0109] In the description of the present application, “plurality” means two or more.

[0110] In the description of the present application, a first feature being “on” or “under” a second feature may include that the first and second features are directly in contact with each other, or may include that the first and second features are not in direct contact with each other but are in contact with each other via another feature therebetween.

[0111] In the description of the present application, “above”, “over” and “above” a first feature to a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0112] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0113] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A rotor assembly of a motor, characterized in that: include: A rotor support, wherein the inner peripheral wall of the rotor support is provided with a plurality of mounting positions evenly spaced apart along the circumference of the rotor assembly; A plurality of rotor cores, the plurality of rotor cores are mounted in the plurality of mounting positions in a one-to-one correspondence, and a rotor slot is defined between two adjacent rotor cores; A permanent magnet is installed in the rotor slot, and the plurality of rotor cores along the radial inner end of the rotor assembly and the permanent magnet along the radial inner end of the rotor assembly jointly define an accommodating cavity for installing a stator assembly.

2. The rotor assembly of the motor according to claim 1, characterized in that: The magnetic pole direction of the permanent magnet is perpendicular to the central axis of the rotor slot, and the central axis of the rotor slot passes through the center of the rotor assembly.

3. The rotor assembly of the motor according to claim 1, characterized in that: The rotor core has an arc segment along the radial inner end of the rotor assembly, the center of curvature of the arc segment is arranged inwardly, and the center of curvature of the arc segment coincides with the central axis of the rotor core.

4. The rotor assembly of the motor according to claim 3, characterized in that: The radius of the arc segment is R1, and the distance from the center of the curvature of the arc segment to the center origin is H1, satisfying: 1.3≤R1 / H1≤2.

5. The rotor assembly of the motor according to claim 1, characterized in that: The permanent magnet has an arc-shaped segment at the radial inner end along the circumferential side wall of the rotor assembly, and the center of curvature of the arc-shaped segment is arranged outward.

6. The rotor assembly of the motor according to any one of claims 1 to 5, characterized in that: One of the radial outer end of the rotor core and the mounting position is provided with a positioning groove, and the other is provided with a positioning protrusion, and the positioning protrusion is positioned and matched with the positioning groove.

7. The rotor assembly of the motor according to claim 6, characterized in that: The positioning groove includes a main groove that fits with the positioning protrusion and a sink groove arranged at the bottom of the main groove.

8. The rotor assembly of the motor according to any one of claims 1 to 5, characterized in that: The height of the rotor core along the axial direction is H2, which satisfies: 9mm≤H2≤22mm.

9. A motor, characterized in that it comprises: chassis; The rotor assembly of the motor according to any one of claims 1 to 8; A stator assembly is installed in the accommodating cavity of the rotor assembly.

10. The motor according to claim 9, characterized in that The stator core of the stator assembly comprises a plurality of stator teeth distributed at intervals in the circumferential direction, the stator teeth extending in the radial direction, and radial outer ends of the stator teeth having tooth shoulders extending in the circumferential direction, wherein the tooth shoulders are provided with magnetic blocking holes.

11. The motor according to claim 10, characterized in that Each of the tooth shoulders is provided with a plurality of magnetic blocking holes which are arranged at intervals in the circumferential direction.

12. The motor according to any one of claims 9 to 11, characterized in that: The housing comprises: a base, the stator assembly being mounted on the base; A protective cover is connected to the base, and the motor shaft of the rotor assembly passes through the protective cover.

13. The motor according to any one of claims 9 to 11, characterized in that: The height of the housing along the axial direction of the motor is H3, which satisfies: 38mm≤H3≤70mm.

14. An electrical appliance, characterized in that: include: power supply; The motor according to any one of claims 9 to 13, wherein an input terminal of the motor is electrically connected to the power supply.

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