Rotor assembly for motor, motor and washing machine

Abstract

The invention discloses a rotor assembly for a motor, the motor and a washing machine, the rotor assembly comprises a pivoting part, a rotor core, a permanent magnet and a magnetic isolation medium, the rotor core is arranged on the periphery of the pivoting part, and a magnet groove is formed in the rotor core; the permanent magnets are arranged on the rotor iron core and are accommodated in the magnet grooves; and the magnetism isolating medium is arranged between the permanent magnet and the pivoting part. According to the rotor assembly provided by the invention, the magnetic isolation medium is arranged between the permanent magnet and the pivoting part, so that the magnetic flux leakage between the permanent magnet and the rotor core can be reduced, and the motor efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the field of motors, and more particularly to a rotor assembly for a motor, a motor, and a washing machine. Background Art

[0002] Permanent magnet synchronous motors are widely used in the drum washing machine market. Conventional permanent magnet synchronous motors have a high magnetic leakage and a low utilization rate of permanent magnet materials, resulting in low motor efficiency and material utilization rate. Summary of the Invention

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, an object of the present invention is to provide a rotor assembly for a motor. According to the rotor assembly of the present invention, by providing a magnetic isolation medium between the permanent magnet and the pivot portion, the magnetic flux leakage between the permanent magnet and the rotor core can be reduced, thereby improving the motor efficiency.

[0004] The present invention also provides a motor having the above rotor assembly.

[0005] The present invention also provides a washing machine having the above motor.

[0006] The rotor assembly according to the present invention is used for a motor, and the rotor assembly includes: a pivot portion; a rotor core disposed on the outer periphery of the pivot portion, a magnet groove being formed on the rotor core; a permanent magnet disposed on the rotor core and received in the magnet groove; and a magnetic isolation medium disposed between the permanent magnet and the pivot portion.

[0007] According to the rotor assembly of the present invention, by disposing the rotor core on the outer periphery of the pivot portion, the rotor core and the pivot portion rotate synchronously to output the rotational torque of the motor. By providing a magnet groove on the rotor core and receiving the permanent magnet in the magnet groove, a stable magnetic field is generated on the rotor core by the permanent magnet. When the magnetic field of the permanent magnet interacts with the rotational magnetic field of the motor, a torque for rotating the pivot shaft is generated. By providing a magnetic isolation medium between the permanent magnet and the pivot portion, the magnetic flux leakage between the permanent magnet and the rotor core can be reduced, thereby improving the motor efficiency. Specifically, the magnetic isolation medium can reduce the magnetic flux flowing from the permanent magnet to the rotor core, thereby reducing the magnetic flux leakage and enabling more magnetic flux to form a closed loop through the gap between the permanent magnet and the rotor core.

[0008] According to some embodiments of the present invention, a limiting portion is formed at one end of the rotor core facing the pivot portion, a limiting groove is formed on the outer peripheral surface of the pivot portion, and the limiting portion and the limiting groove are in limiting cooperation to limit the arc-shaped laminations from radially disengaging from the pivot portion.

[0009] According to some embodiments of the present invention, the pivoting part includes: a rotating shaft; a coupling, the coupling is arranged on the outer periphery of the rotating shaft and connected to the rotating shaft, and a limiting groove is formed on the outer periphery of the coupling.

[0010] According to some embodiments of the present invention, the coupling is configured as a non-magnetic member.

[0011] According to some embodiments of the present invention, the magnet groove extends in the radial direction of the rotor core, and both ends of the permanent magnet are a first magnetic pole and a second magnetic pole respectively.

[0012] According to some embodiments of the present invention, a plurality of the magnet grooves are configured, and the plurality of magnet grooves are arranged at intervals in the circumferential direction.

[0013] According to some embodiments of the present invention, the magnetic isolation medium is configured as a magnetic isolation gas or a non-magnetic injection filling material.

[0014] According to some embodiments of the present invention, the rotor core includes: rotor laminations, the rotor laminations are sleeved on the outer periphery of the pivoting part and are configured as a plurality of stacked in the thickness direction, and each rotor lamination is formed with the magnet groove.

[0015] According to some embodiments of the present invention, the rotor lamination includes: arc-shaped laminations, the arc-shaped laminations are configured as a plurality of arranged at intervals in the circumferential direction of the pivoting part, and the magnet groove is defined between two adjacent arc-shaped laminations.

[0016] According to some embodiments of the present invention, a first protrusion and a second protrusion are respectively formed on the surfaces of two adjacent arc-shaped laminations facing each other, the first protrusion and the second protrusion extend towards each other and respectively abut against the permanent magnet in the radial direction of the rotor core, and the first protrusion and the second protrusion are arranged at intervals.

[0017] According to some embodiments of the present invention, each arc-shaped lamination is formed with a hollow gap penetrating in the thickness direction.

[0018] According to some embodiments of the present invention, the rotor assembly further includes: a rotor sleeve, the rotor sleeve is disposed around the outer periphery of the plurality of arc-shaped laminations.

[0019] The motor according to the present invention is briefly described below.

[0020] The motor according to the present invention includes the rotor assembly described in any one of the above embodiments. Since the motor according to the present invention includes the rotor assembly described in any one of the above embodiments, therefore, for the motor according to the present invention, the leakage of magnetic flux is reduced, and the magnetic flux is more evenly distributed between the rotor core and the permanent magnet, improving the output torque and efficiency of the motor.

[0021] The washing machine according to the present invention will be briefly described below.

[0022] The washing machine according to the present invention includes the motor described in any of the above embodiments. Since the washing machine according to the present invention includes the motor described in any of the above embodiments, during operation, the washing machine according to the present invention can convert electrical energy into mechanical energy more efficiently, thereby improving the energy utilization rate of the washing machine. In addition, due to the reduction of magnetic flux leakage, the loss of the motor is also correspondingly reduced, reducing energy waste and heat generation, and improving the reliability of the washing machine.

[0023] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0025] Figure 1 is a schematic structural diagram of a motor according to an embodiment of the present invention.

[0026] Reference numerals:

[0027] Rotating member assembly 1;

[0028] Pivoting portion 11, rotating shaft 111, coupling 112;

[0029] Rotating core 12, magnet slot 121, arc-shaped laminated sheet 122, first protrusion 122a, second protrusion 122b, hollow gap 122c;

[0030] Permanent magnet 13, magnetic isolation medium 14, rotating sleeve 15;

[0031] Stator core 2. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0032] Embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0033] In the related art, permanent magnet synchronous motors are widely used in the drum washing machine market. Due to a large amount of magnetic leakage in conventional permanent magnet synchronous motors, the utilization rate of permanent magnet materials is low, resulting in low motor efficiency and material utilization rate.

[0034] Reference will be made below to Figure 1 describe the rotating member assembly 1 according to an embodiment of the present invention.

[0035] The rotor assembly 1 according to the present invention is used for an electric motor. The rotor assembly 1 includes a pivot portion 11, a rotor core 12, a permanent magnet 13, and a magnetic isolation medium 14. The rotor core 12 is disposed on the outer periphery of the pivot portion 11, and a magnet groove 121 is formed on the rotor core 12; the permanent magnet 13 is disposed on the rotor core 12 and received in the magnet groove 121; the magnetic isolation medium 14 is disposed between the permanent magnet 13 and the pivot portion 11.

[0036] For the rotor assembly 1 of the present application, by disposing the rotor core 12 on the outer periphery of the pivot portion 11, the rotor core 12 and the pivot portion 11 rotate synchronously to output the rotational torque of the electric motor. By providing the magnet groove 121 on the rotor core 12 and receiving the permanent magnet 13 in the magnet groove 121, a stable magnetic field is generated by the permanent magnet 13 on the rotor core 12. When the magnetic field of the permanent magnet 13 interacts with the rotational magnetic field of the electric motor, a torque is generated to rotate the pivot shaft 111. By providing the magnetic isolation medium 14 between the permanent magnet 13 and the pivot portion 11, the magnetic flux leakage between the permanent magnet 13 and the rotor core 12 can be reduced, thereby improving the efficiency of the electric motor. Specifically, the magnetic isolation medium 14 can reduce the magnetic flux flowing from the permanent magnet 13 to the rotor core 12, thereby reducing the magnetic flux leakage and enabling more magnetic flux to form a closed loop through the gap between the permanent magnet 13 and the rotor core 12.

[0037] Therefore, for the rotor assembly 1 of the present application, by providing the magnetic isolation medium 14 between the permanent magnet 13 and the pivot portion 11, the magnetic flux leakage between the permanent magnet 13 and the rotor core 12 can be reduced, thereby improving the efficiency of the electric motor.

[0038] According to some embodiments of the present invention, a limiting portion is formed at one end of the rotor core 12 facing the pivot portion 11, and a limiting groove is formed on the outer peripheral surface of the pivot portion 11. The limiting portion and the limiting groove are in limiting cooperation to limit the rotor core 12 from radially disengaging from the pivot portion 11. By providing the limiting portion at one end of the rotor core 12 facing the pivot portion 11 and forming the limiting groove on the outer peripheral surface of the pivot portion 11, the limiting cooperation between the limiting portion and the limiting groove can effectively limit the rotor core 12 from radially disengaging from the pivot portion 11, thereby improving the stability and reliability of the rotor assembly 1. Specifically, when the electric motor is operating, the rotor core 12 needs to rotate with the pivot portion 11. Due to the cooperation of the limiting portion and the limiting groove, it is difficult for the rotor core 12 to radially disengage from the pivot portion 11, thereby enabling the electric motor to operate normally.

[0039] According to some embodiments of the present invention, such as Figure 1As shown, the pivot part 11 includes a rotating shaft 111 and a coupling 112. The coupling 112 is disposed on the outer periphery of the rotating shaft 111 and connected to the rotating shaft 111. A limiting groove is formed on the outer periphery of the coupling 112. The coupling 112 is a component that transmits the power of the rotor core 12 to the pivot shaft 111. By disposing the coupling 112 on the outer periphery of the rotating shaft 111 and connecting it to the rotating shaft 111, effective power transmission can be achieved. At the same time, by providing a limiting groove on the outer periphery of the coupling 112, and the limiting groove is in limiting cooperation with the limiting part on the rotor core 12, the rotor core 12 can be restricted from radially disengaging from the pivot part 11, improving the reliability of the transmission.

[0040] According to some embodiments of the present invention, the coupling 112 is configured as a non-magnetic component. By configuring the coupling 112 as a non-magnetic component, the coupling 112 does not have magnetic conductivity and will not conduct magnetic fields, which can effectively reduce magnetic flux leakage and improve the efficiency of the motor. Specifically, the coupling 112 is made of non-magnetic materials such as plastics, aluminum alloys or other non-metallic materials, enabling the coupling 112 to have good mechanical strength and wear resistance, capable of withstanding the movement and vibration of the rotating shaft 111, enhancing the isolation effect of the coupling 112 on the magnetic field, and effectively reducing magnetic flux leakage.

[0041] According to some embodiments of the present invention, as Figure 1 shown, the magnet groove 121 extends in the radial direction of the rotor core 12, and the two ends of the permanent magnet 13 are the first magnetic pole and the second magnetic pole respectively. By configuring the magnet groove 121 to extend in the radial direction of the rotor core 12, the arrangement of the permanent magnet 13 on the rotor core 12 can be optimized, enabling the permanent magnet 13 to generate a more stable magnetic field in the radial direction, and the permanent magnet 13 can better adapt to the operating requirements of the motor. At the same time, the two ends of the permanent magnet 13 are the first magnetic pole and the second magnetic pole respectively, where one of the first magnetic pole and the second magnetic pole is the north pole and the other is the south pole. Since the magnetic force direction of the permanent magnet 13 is always from the north pole to the south pole, by providing a magnetic isolation medium 14 between the permanent magnet 13 and the pivot part 11, the magnetic field distribution can be further optimized, magnetic flux leakage can be reduced, and the motor efficiency can be improved.

[0042] According to some embodiments of the present invention, as Figure 1As shown, the magnet slots 121 are configured to be multiple, and the multiple magnet slots 121 are circumferentially spaced apart. By configuring the magnet slots 121 to be multiple and circumferentially spaced apart, the permanent magnets 13 form multiple sets of magnetic poles on the rotor core 12, thereby generating a more stable and more uniform magnetic field, which is beneficial to improving the output torque and efficiency of the motor. Specifically, when the multiple magnet slots 121 are circumferentially spaced apart, the permanent magnets 13 form multiple sets of magnetic poles on the rotor core 12, and each set of magnetic poles has a magnetic force intensity and direction. The multiple sets of magnetic poles interact with each other during the operation of the motor to generate a stable magnetic field, improving the uniformity and stability of the magnetic field distribution, thereby improving the output torque and efficiency of the motor.

[0043] In the description of the present invention, "multiple" means two or more.

[0044] According to some embodiments of the present invention, the magnetic isolation medium 14 is configured as a magnetic isolation gas. The magnetic isolation gas is a non-magnetic conductive gas. The magnetic isolation gas can be a gas, such as nitrogen, helium or argon, etc.; the magnetic isolation gas can also be a mixture of multiple gases, such as air, etc. The application of the magnetic isolation gas in the rotor assembly 1 can effectively prevent the magnetic flux from flowing from the permanent magnet 13 to the rotor core 12, thereby reducing the magnetic flux leakage.

[0045] According to some embodiments of the present invention, the magnetic isolation medium 14 is configured as a non-magnetic injection filling material. The non-magnetic injection filling material is a non-magnetic plastic material, such as polyimide, polyether ether ketone or polycarbonate, etc. The non-magnetic injection filling material can be injection molded in the magnet slot 121 to facilitate the setting of the magnetic isolation medium 14. By injecting the non-magnetic injection filling material into the magnet slot 121, the non-magnetic injection filling material can prevent the magnetic flux from flowing from the permanent magnet 13 to the rotor core 12, improving the efficiency of the motor.

[0046] According to some embodiments of the present invention, the rotor core 12 includes rotor laminations, the rotor laminations are sleeved on the outer periphery of the pivot portion 11 and are configured to be multiple stacked in the thickness direction, and each rotor lamination is formed with a magnet slot 121. By configuring the rotor laminations to be multiple stacked in the thickness direction, the multiple rotor laminations are stacked together to form the rotor core 12, which can improve the utilization rate of the manufacturing materials. Specifically, each rotor lamination is an independent unit and can be manufactured and processed separately, thereby reducing the material waste and cost increase caused by processing the entire rotor core as a whole traditionally, and simplifying the manufacturing process. At the same time, each rotor lamination is formed with a magnet slot 121, and the magnet slots 121 on the multiple rotor laminations together accommodate the permanent magnets 13, thereby providing a stable magnetic field.

[0047] According to some embodiments of the present invention, as Figure 1As shown, the rotor laminations include arc-shaped laminations 122, and the arc-shaped laminations 122 are configured to be a plurality of circumferentially spaced apart around the pivot portion 11. A magnet slot 121 is defined between two adjacent arc-shaped laminations 122. The cross-sectional shape of the arc-shaped lamination 122 is arc-shaped. By arranging a plurality of arc-shaped laminations 122 circumferentially spaced apart around the pivot portion 11, the plurality of arc-shaped laminations 122 can jointly form a rotor core 12 with a circular cross-sectional shape, making the rotation of the rotor core 12 smoother and more uniform. And a magnet slot 121 extending in the radial direction of the rotor core 12 can be defined between two adjacent arc-shaped laminations 122, so that the magnet slot 121 can adapt to the shape of the permanent magnet 13 to accommodate the permanent magnet 13 and form a stable magnetic circuit.

[0048] According to some embodiments of the present invention, as Figure 1 shown, a first protrusion 122a and a second protrusion 122b are respectively formed on the surfaces of two adjacent arc-shaped laminations 122 facing each other. The first protrusion 122a and the second protrusion 122b extend towards each other and respectively abut against the permanent magnet 13 in the radial direction of the rotor core 12, and the first protrusion 122a and the second protrusion 122b are spaced apart. By respectively forming the first protrusion 122a and the second protrusion 122b on the surfaces of two adjacent arc-shaped laminations 122 facing each other, the stability of the rotor assembly 1 can be enhanced, and the rotation process of the motor is smoother and more reliable. The first protrusion 122a and the second protrusion 122b extend towards each other and respectively abut against the permanent magnet 13 in the radial direction of the rotor core 12, so as to more reliably fix the permanent magnet 13, and the permanent magnet 13 is not easily displaced during the rotation of the rotor assembly 1. And by spacing the first protrusion 122a and the second protrusion 122b apart, there is a gap between the first protrusion 122a and the second protrusion 122b, and a magnetic isolation medium 14 can be conveniently arranged between the first protrusion 122a and the second protrusion 122b to reduce the magnetic flux leakage between the permanent magnet 13 and the rotor core 12 and improve the efficiency of the motor.

[0049] According to some embodiments of the present invention, as Figure 1 shown, a through gap 122c penetrating in the thickness direction is formed on each arc-shaped lamination 122. By arranging the through gap 122c penetrating in the thickness direction on the arc-shaped lamination 122, the weight of the arc-shaped lamination 122 can be reduced, thereby reducing the moment of inertia of the rotor assembly 1 and improving the rotational performance of the rotor assembly 1. At the same time, due to the existence of the through gap 122c, the stress can be dispersed, and the mechanical stress on the rotor core 12 can be reduced, thereby optimizing the stress distribution.

[0050] According to some embodiments of the present invention, as Figure 1As shown, the rotor assembly 1 further includes a rotor sleeve 15, which is disposed around the outer periphery of a plurality of arc-shaped laminations 122. By disposing the rotor sleeve 15 around the outer periphery of the plurality of arc-shaped laminations 122, the rotor sleeve 15 fixes the plurality of arc-shaped laminations 122 together, enabling the rotor core 12 to form a stable structure, strengthening the strength of the rotor assembly 1, and enabling the rotor assembly 1 to withstand greater centrifugal force and higher rotational speed. Moreover, the cross-sectional shape of the rotor sleeve 15 is circular, which can reduce the wind resistance borne during the rotation of the rotor assembly 1, reduce noise, and improve the motor efficiency. At the same time, the circular cross-sectional shape makes the rotor sleeve 15 more convenient during manufacturing and installation, reducing the manufacturing cost.

[0051] In summary, the rotor assembly 1 of the embodiment of the present application includes a pivot portion 11, a rotor core 12, a permanent magnet 13, and a magnetic isolation medium 14; by disposing the rotor core 12 on the outer periphery of the pivot portion 11, the rotor core 12 rotates synchronously with the pivot portion 11 to output the rotational torque of the motor. By providing magnet slots 121 on the rotor core 12 and accommodating the permanent magnets 13 in the magnet slots 121, stable magnetic fields are generated by the permanent magnets 13 on the rotor core 12. When the magnetic fields of the permanent magnets 13 interact with the rotational magnetic field of the motor, a torque is generated to rotate the pivot shaft 111. By providing a magnetic isolation medium 14 between the permanent magnets 13 and the pivot portion 11, the magnetic flux leakage between the permanent magnets 13 and the rotor core 12 can be reduced, thereby improving the motor efficiency. Specifically, the magnetic isolation medium 14 can reduce the magnetic flux flowing from the permanent magnets 13 to the rotor core 12, thereby reducing the magnetic flux leakage and enabling more magnetic flux to form a closed loop through the gap between the permanent magnets 13 and the rotor core 12. By providing a limit groove on the outer periphery of the coupling 112, and the limit groove is in limit cooperation with the limit portion on the rotor core 12, the rotor core 12 can be restricted from radially disengaging from the pivot portion 11, improving the reliability of the transmission. By constructing the coupling 112 as a non-magnetic conductive member, the coupling 112 does not have magnetic conductivity and does not conduct magnetic fields, which can effectively reduce the magnetic flux leakage and improve the efficiency of the motor. The magnetic isolation medium 14 can be a magnetic isolation gas, and the magnetic isolation gas is a non-magnetic conductive gas. The magnetic isolation gas can be a single gas, such as nitrogen, helium, or argon, etc.; the magnetic isolation gas can also be a mixture of multiple gases, such as air, etc. The magnetic isolation medium 14 can also be a non-magnetic injection filling material. The non-magnetic injection filling material is a non-magnetic conductive plastic material, such as polyimide, polyether ether ketone, or polycarbonate, etc. The non-magnetic injection filling material can be injected into the magnet slots 121 to facilitate the setting of the magnetic isolation medium 14. At the same time, by constructing the magnet slots 121 to extend in the radial direction of the rotor core 12, the arrangement of the permanent magnets 13 on the rotor core 12 can be optimized, enabling a more stable magnetic field to be generated in the radial direction by the permanent magnets 13, and the permanent magnets 13 can better adapt to the operating requirements of the motor. The rotor core 12 includes rotor laminations; by constructing the rotor laminations as a plurality of stacked in the thickness direction, the plurality of rotor laminations are stacked together to form the rotor core 12, which can improve the utilization rate of the manufacturing materials. Specifically, each rotor lamination is an independent unit and can be manufactured and processed separately, thereby reducing the material waste and cost increase caused by the traditional method of processing the entire rotor core as a whole, and simplifying the manufacturing process. The rotor laminations include arc-shaped laminations 122, and the arc-shaped laminations 122 are constructed as a plurality of spaced apart in the circumferential direction of the pivot portion 11, and the magnet slots 121 are defined between two adjacent arc-shaped laminations 122.The cross-sectional shape of the arc-shaped laminations 122 is arc-shaped. By arranging a plurality of arc-shaped laminations 122 at intervals in the circumferential direction of the pivot portion 11, the plurality of arc-shaped laminations 122 can jointly form a rotor core 12 with a circular cross-sectional shape, making the rotation of the rotor core 12 smoother and more uniform. The pivot portion 11 includes a rotating shaft 111 and a coupling 112. By arranging the coupling 112 on the outer periphery of the rotating shaft 111 and connecting it to the rotating shaft 111, effective transmission of power can be achieved. The rotor assembly 1 further includes a rotor sleeve 15. By arranging the rotor sleeve 15 around the outer periphery of the plurality of arc-shaped laminations 122, the rotor sleeve 15 fixes the plurality of arc-shaped laminations 122 together, forming a stable structure for the rotor core 12, strengthening the strength of the rotor assembly 1, and enabling the rotor assembly 1 to withstand greater centrifugal force and higher rotational speed. Moreover, the cross-sectional shape of the rotor sleeve 15 is circular, which can reduce the wind resistance borne during the rotation of the rotor assembly 1, reduce noise, and improve the efficiency of the motor.

[0052] The motor according to the present invention will be briefly described below.

[0053] The motor according to the present invention includes the rotor assembly 1 in any one of the above embodiments. Since the motor according to the present invention includes the rotor assembly 1 in any one of the above embodiments, the leakage of magnetic flux in the motor is reduced, and the magnetic flux is more evenly distributed between the rotor core 12 and the permanent magnet 13, improving the output torque and efficiency of the motor.

[0054] According to some embodiments of the present invention, the motor includes a stator disposed on the outer periphery of the rotor assembly 1; the stator includes a stator core 2 and a stator winding wound around the stator core 2. During the operation of the motor, an electromagnetic field is formed between the stator core 2 and the rotor core 12. When an electric current passes through the stator winding, a rotating magnetic field is generated, and the interaction between the rotating magnetic field and the rotor core 12 generates a torque, thereby driving the rotating shaft 111 to rotate.

[0055] According to some embodiments of the present invention, a plurality of spaced-apart mating grooves are formed on the outer peripheral surface of the stator core 2, and the mating grooves are adapted to be matingly connected to the skeleton of the motor. Specifically, the mating grooves can be evenly distributed along the outer peripheral surface of the stator core 2 and cooperate with the corresponding structures on the skeleton of the motor. By inserting the skeleton into the mating grooves, a reliable connection between the stator core 2 and the skeleton can be achieved, reducing the generation of vibration and noise, and improving the performance and reliability of the motor.

[0056] According to some embodiments of the present invention, the stator core 2 is manufactured by a process of straight punching, sleeve cutting, coiling and welding followed by winding or straight punching, sleeve cutting, winding and then coiling and welding. By adopting the process of straight punching, sleeve cutting, coiling and welding followed by winding or straight punching, sleeve cutting, winding and then coiling and welding, the manufacturing process of the stator core 2 is more simplified and efficient, can make full use of materials, and reduce waste. Exemplarily, the manufacturing process of the stator core 2 includes the following steps: First, the material of the stator core 2 is cut by straight punching and sleeve cutting, and then the stator core 2 is coiled into a circular shape. Next, the coiled circular stator core 2 is welded to increase the structural strength and stability of the stator core 2. Finally, a winding operation is performed on the welded stator core 2 to form the coils of the motor.

[0057] The washing machine according to the present invention will be briefly described below.

[0058] The washing machine according to the present invention includes the motor in any one of the above embodiments. Since the washing machine according to the present invention includes the motor in any one of the above embodiments, the washing machine according to the present invention can convert electrical energy into mechanical energy more efficiently during operation, thereby improving the energy utilization rate of the washing machine. In addition, due to the reduction of magnetic flux leakage, the loss of the motor is also correspondingly reduced, reducing energy waste and heat generation, and improving the reliability of the washing machine.

[0059] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0060] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0061] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0062] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A rotor assembly for an electric machine, characterized in that, Comprising: A pivot part (11); A rotor iron core (12), the rotor iron core (12) being disposed on the outer periphery of the pivot part (11), and magnet slots (121) being formed on the rotor iron core (12); A permanent magnet (13), the permanent magnet (13) being disposed on the rotor iron core (12) and received in the magnet slots (121); A magnetic isolation medium (14), the magnetic isolation medium (14) being disposed between the permanent magnet (13) and the pivot part (11).

2. The rotor assembly according to claim 1, characterized in that, The inner periphery of the rotor iron core (12) facing the pivot part (11) forms a limiting part, and a limiting groove is formed on the outer peripheral surface of the pivot part (11). The limiting part and the limiting groove are in limiting cooperation to limit the rotor iron core (12) from radially disengaging from the pivot part (11).

3. The rotor assembly according to claim 2, wherein The pivot part (11) comprises: A rotating shaft (111); A coupling (112), the coupling (112) being disposed on the outer periphery of the rotating shaft (111) and connected to the rotating shaft (111), and the limiting groove being formed on the outer periphery of the coupling (112).

4. The rotor assembly according to claim 3, characterized in that, The coupling (112) is configured as a non-magnetic member.

5. The rotor assembly according to claim 1, characterized in that, The magnet slots (121) extend in the radial direction of the rotor iron core (12), and the two ends of the permanent magnet (13) are respectively a first magnetic pole and a second magnetic pole.

6. The rotor assembly according to claim 5, characterized in that, The magnet slots (121) are configured as multiple, and the multiple magnet slots (121) are circumferentially spaced.

7. The rotor assembly according to claim 1, characterized in that, The magnetic isolation medium (14) is configured as a magnetic isolation gas or a non-magnetic injection filling material.

8. The rotor assembly according to claim 1, characterized in that The rotor iron core (12) comprises: Rotor laminations, the rotor laminations being sleeved on the outer periphery of the pivot part (11) and configured as multiple stacked in the thickness direction, and each rotor lamination having the magnet slots (121) formed thereon.

9. The rotor assembly according to claim 8, wherein The rotor laminations comprise: Arc-shaped laminations (122), the arc-shaped laminations (122) being configured as multiple spaced circumferentially around the pivot part (11), and the magnet slots (121) being defined between two adjacent arc-shaped laminations (122).

10. The rotor assembly according to claim 9, characterized in that, First protrusions (122a) and second protrusions (122b) are respectively formed on the surfaces of two adjacent arc-shaped laminations (122) facing each other. The first protrusions (122a) and the second protrusions (122b) extend towards each other and respectively abut against the permanent magnet (13) in the radial direction of the rotor iron core (12), and the first protrusions (122a) and the second protrusions (122b) are spaced.

11. The rotor assembly according to claim 9, characterized in that, Each arc-shaped lamination (122) has a through void (122c) formed therethrough in the thickness direction.

12. The rotor assembly according to claim 9, characterized in that, Further comprising: A rotor sleeve (15), the rotor sleeve (15) being disposed around the outer periphery of the multiple arc-shaped laminations (122).

13. A motor, characterized in that, Comprising the rotor assembly (1) according to any one of claims 1 - 12.

14. A washing machine, characterized in that, Comprising the motor according to claim 13.

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