Motor and compressor

Abstract

The application provides a motor and compressor, the motor comprises a stator, a rotor assembly and a balance part, the rotor assembly is arranged in the interior of the stator, the rotor assembly comprises a body part, a first permanent magnet fixedly arranged on the body part and at least one second permanent magnet movably arranged on the body part, the second permanent magnet moves towards or away from the stator, and the balance part at least comprises a first balance block arranged at one end in the axial direction of the body part, and the second permanent magnet is arranged opposite to the first balance block in the circumferential direction of the body part.The motor and compressor provided by the application can solve the problem that the motor rotor rotates eccentrically in the prior art, resulting in noise and affecting the operation of the compressor.

Description

Technical Field

[0001] This invention relates to the technical field of power equipment, and more specifically, to an electric motor and a compressor. Background Technology

[0002] Compressors are widely used as power output components in work and daily life. In existing technology, fully enclosed rotary compressors, a type of compressor, employ a direct-drive structure, where a motor directly drives the crankshaft. Because the crankshaft has an eccentric structure, the motor rotor typically uses counterweights to ensure the balance of the rotating system. As the compressor displacement increases, the eccentric portion of the crankshaft also increases, and the mass of the counterweights on the rotor also increases accordingly. This increases the centrifugal inertial force of the compressor pump rotor assembly and the deflection of the cantilevered shaft, causing the motor rotor to operate eccentrically at high speeds. This significantly affects the compressor's vibration and noise. Furthermore, the increased eccentricity of the compressor leads to increased unbalanced magnetic pull on the motor, further worsening the eccentricity and severely impacting the compressor's operational reliability.

[0003] As can be seen from the above, the existing technology has problems with the eccentric operation of the motor rotor during rotation, which causes noise and affects the operation of the compressor. Summary of the Invention

[0004] The main objective of this invention is to provide a motor and a compressor to solve the problem in the prior art where the eccentric operation of the motor rotor during rotation causes noise and affects the operation of the compressor.

[0005] To achieve the above objectives, according to one aspect of the present invention, an electric motor is provided, the electric motor including a stator, a rotor assembly and a balancing part, the rotor assembly being disposed inside the stator, the rotor assembly including a body part and a first permanent magnet fixedly disposed on the body part and a second permanent magnet at least partially disposed on the body part, the second permanent magnet moving toward or away from the stator, the balancing part including at least a first balancing block disposed at one end of the body part in the axial direction, and a second permanent magnet disposed opposite to the first balancing block in the circumferential direction of the body part.

[0006] Furthermore, at least a portion of the second permanent magnet has a first position and a second position. When at least a portion of the second permanent magnet is in the first position, the distance between at least a portion of the second permanent magnet and the stator is equal to the distance between the first permanent magnet and the stator. When at least a portion of the second permanent magnet is in the second position, the distance between at least a portion of the second permanent magnet and the stator is less than the distance between the first permanent magnet and the stator.

[0007] Furthermore, the first part of the second permanent magnet is movably positioned towards or away from the stator, and the first part along the axial direction of the body is located at one end close to the first balance block.

[0008] Furthermore, the main body has a first limiting groove for mounting a first permanent magnet and a second limiting groove for mounting a second permanent magnet. At least a portion of the second limiting groove is at a distance less than the distance between the first limiting groove and the stator. At least a portion of the second permanent magnet is movably disposed inside the second limiting groove.

[0009] Furthermore, the distance between the first side of the first limiting groove near the axis of the body and the first side of the second limiting groove near the axis of the body and the axis of the body are equal; at least a portion of the second side opposite to the first side of the second limiting groove is less than the distance between the first limiting groove and the stator, and at least a portion of the second permanent magnet moves between the first side and the second side of the second limiting groove.

[0010] Furthermore, along the axial direction of the rotor assembly, the wall of the second side of the second limiting groove is an inclined structure, and the distance between the wall of the second side and the wall of the first side gradually increases in the direction toward the first balance block, so that the groove opening at the end of the second limiting groove toward the first balance block is larger than the groove opening at the end of the second limiting groove away from the first balance block.

[0011] Furthermore, the opening of the second limiting groove at the end furthest from the first balancing block is the same size as the opening of the first limiting groove.

[0012] Furthermore, along the axial direction of the rotor assembly, the second limiting groove includes multiple groove segments connected in series, and the distance between the second side of at least one groove segment and the stator is less than the distance between the first limiting groove and the stator; the second permanent magnet includes multiple magnet segments, and at least one magnet segment is disposed inside each groove segment.

[0013] Furthermore, the number of multiple slot segments does not exceed four; and / or the distance between the second side of a portion of the multiple slot segments and the stator is less than the distance between the first limiting slot and the stator, and the distance between the second side of another portion of the multiple slot segments and the stator is equal to the distance between the first limiting slot and the stator; and / or the slot segments and magnet segments are set in a one-to-one correspondence.

[0014] Furthermore, the distance between the second side of the slot segment closest to the first balance block and the stator is greater than the distance between the first limiting slot and the stator.

[0015] Furthermore, along the circumference of the main body, a first permanent magnet is formed in a first region, and a second permanent magnet is formed in a second region. The second region is not larger than the first region and is located on the side opposite to the first balance block.

[0016] Furthermore, along the circumference of the main body, the second region is located inside the region at a central angle of ±120° from the first balance block; and / or the number of the second permanent magnets is n, the number of the first permanent magnets is m, and 1≤n≤m.

[0017] Furthermore, at least one pair of first permanent magnets are provided within the first region. When multiple pairs of first permanent magnets are provided, the multiple pairs of first permanent magnets are arranged continuously, and the two first permanent magnets in each pair are arranged symmetrically about a certain reference diameter. At least one pair of second permanent magnets are provided within the second region. When multiple pairs of second permanent magnets are provided, the multiple pairs of first permanent magnets are arranged continuously, and the two second permanent magnets in each pair are arranged symmetrically about a certain reference diameter.

[0018] Furthermore, the two first permanent magnets arranged in pairs form a V-shaped structure; and / or the two second permanent magnets arranged in pairs form a V-shaped structure; and / or adjacent first and second permanent magnets form a V-shaped structure.

[0019] Furthermore, the motor also includes an axial limiting member, which includes a baffle plate disposed at the opening of the first limiting groove and the second limiting groove along the axial direction of the main body; and a radial limiting member, which is a protruding structure disposed on the wall surface of the first side and the second side of the first limiting groove and the second limiting groove respectively.

[0020] Furthermore, the motor also includes a reset structure disposed on the main body, which provides driving force for at least a portion of the second permanent magnet to move toward the first balance block.

[0021] Furthermore, the main body has a first rotational speed state and a second rotational speed state. The rotational speed of the main body when it is in the first rotational speed state is greater than the rotational speed of the main body when it is in the second rotational speed state. When the main body is in the first rotational speed state, the centrifugal force of the second permanent magnet is greater than the driving force of the reset structure, and at least a portion of the second permanent magnet moves to a position where the distance between it and the stator is less than the distance between the first permanent magnet and the stator. When the main body switches from the first rotational speed state to the second rotational speed state, the driving force of the reset structure is greater than the centrifugal force of the second permanent magnet, and at least a portion of the second permanent magnet moves toward the direction of the first balance block.

[0022] Furthermore, the reset structure includes a reset member, which is disposed on the first or second side of the second limiting groove on the main body. The reset member provides a driving force for the second permanent magnet to move toward the first balance block.

[0023] Furthermore, the reset structure includes a third permanent magnet, which is disposed on the main body and located between the second permanent magnet and the first balance block. The magnetic poles of the third permanent magnet and the second permanent magnet are opposite to each other on the side they are facing.

[0024] Furthermore, the distance between the third permanent magnet and the second permanent magnet is no greater than the distance between the third permanent magnet and the first balance block.

[0025] Furthermore, the third permanent magnet is provided in a one-to-one correspondence with the second permanent magnet, and the third permanent magnet is located on the extension line of the second side of the second limiting groove on the corresponding body part facing the first side.

[0026] Furthermore, along the axial direction of the main body, the length of the third permanent magnet is less than the length of the second permanent magnet, and the third permanent magnet is disposed on one end of the main body near the first balance block.

[0027] Furthermore, the balancing section also includes a second balancing block, which is disposed on the body section at the end away from the first balancing block.

[0028] Furthermore, the second balance block and the first balance block are spaced 180° apart along the circumference of the main body.

[0029] According to another aspect of the present invention, a compressor is provided, which includes the motor described above.

[0030] According to the technical solution of the present invention, the motor includes a stator, a rotor assembly and a balancing part. The rotor assembly is disposed inside the stator. The rotor assembly includes a body part and a first permanent magnet fixedly disposed on the body part and a second permanent magnet at least partially disposed on the body part. The second permanent magnet moves toward or away from the stator. The balancing part includes at least a first balancing block disposed at one end of the body part in the axial direction. A second permanent magnet in the circumferential direction of the body part is disposed opposite to the first balancing block.

[0031] As can be seen from the above, this application adopts a structure in which at least a portion of the second permanent magnet is movable, thereby enabling the second permanent magnet to move toward or away from the stator. When the movable second permanent magnet moves toward the stator, the magnetic force between the second permanent magnet and the stator increases, thereby overcoming the centrifugal force on the first balance block, achieving overall rotational balance of the rotor assembly, reducing noise, improving the rotational stability of the rotor assembly, and ensuring the normal operation of the compressor. Attached Figure Description

[0032] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0033] Figure 1 A radial sectional view of the motor of the present invention is shown;

[0034] Figure 2 An axial sectional view of the motor in Embodiment 1 of the present invention is shown;

[0035] Figure 3 An axial sectional view of the motor in Embodiment 2 of the present invention is shown;

[0036] Figure 4 A cross-sectional view of the compressor in Embodiment 4 of the present invention is shown.

[0037] The above figures include the following reference numerals:

[0038] 10. Body; 110. First limiting groove; 120. Second limiting groove; 121. Groove segment; 20. First permanent magnet; 30. Second permanent magnet; 310. Magnet segment; 40. Third permanent magnet; 50. First balance block; 610. Axial limiting component; 620. Radial limiting component; 70. Second balance block; 80. Stator; 90. Pump body assembly; 100. Crankshaft. Detailed Implementation

[0039] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0040] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0041] In this invention, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this invention.

[0042] Example 1

[0043] To address the problem of noise generation and compressor operation caused by eccentric operation of the motor rotor during rotation in existing technologies, this invention provides a motor.

[0044] like Figure 1 , Figure 2 and Figure 4 As shown, the motor includes a stator 80, a rotor assembly, and a balancing part. The rotor assembly is disposed inside the stator 80. The rotor assembly includes a body part 10, a first permanent magnet 20 fixedly disposed on the body part 10, and a second permanent magnet 30 at least partially disposed on the body part 10. The second permanent magnet 30 moves toward or away from the stator 80. The balancing part includes at least a first balancing block 50 disposed at one end of the body part 10 in the axial direction. A second permanent magnet is disposed opposite to the first balancing block 50 in the circumferential direction of the body part 10.

[0045] Specifically, this application employs a structure in which at least a portion of the second permanent magnet 30 is movable, thereby enabling the second permanent magnet 30 to move towards or away from the stator 80. When the movable second permanent magnet 30 moves towards the stator 80, the magnetic force between the second permanent magnet 30 and the stator 80 increases, thereby overcoming the centrifugal force on the first balance block 50, achieving overall rotational balance of the rotor assembly, reducing noise, improving the rotational stability of the rotor assembly, and ensuring the normal operation of the compressor.

[0046] Furthermore, the rotor assembly is rotatably disposed inside the stator 80, and the balancing part rotates with the rotor assembly. During the rotation of the rotor assembly, as the rotational speed of the rotating assembly increases, the centrifugal force on the first balancing block 50 increases. To balance the centrifugal force on the first balancing block 50, at least a portion of the second permanent magnet 30 moves toward the stator 80, overcoming the first balancing block 50 through magnetic force.

[0047] Furthermore, the first balance block 50 is a counterweight block, and the first balance block 50 is disposed on the end face of the main body 10 in the axial direction near the peripheral edge.

[0048] It should be noted that in this embodiment, at least a portion of the second permanent magnet can be movable, with one part of the second permanent magnet 30 movable and the other part fixed, or the entire second permanent magnet 30 can be movable. When the first part of the second permanent magnet 30 is movable and the second part is fixed, the first part along the axial direction of the body portion 10 is located at the end closer to the first balance block 50. That is, the end facing the first balance block 50 is movable, so as to better balance the first balance block 50 and improve the rotational stability of the rotor assembly.

[0049] In this embodiment, at least a portion of the second permanent magnet 30 has a first position and a second position. When at least a portion of the second permanent magnet 30 is in the first position, the distance between at least a portion of the second permanent magnet 30 and the stator 80 is equal to the distance between the first permanent magnet 20 and the stator 80. When at least a portion of the second permanent magnet 30 is in the second position, the distance between at least a portion of the second permanent magnet 30 and the stator 80 is less than the distance between the first permanent magnet 20 and the stator 80.

[0050] During the rotation of the rotor assembly, at least a portion of the second permanent magnet 30 switches between a first position and a second position to balance the centrifugal force on the first balance block 50. When at least a portion of the second permanent magnet 30 is in the first position, the magnetic forces between the first permanent magnet 20, the second permanent magnet 30, and the stator 80 are the same.

[0051] like Figures 1 to 2As shown, the main body 10 has a first limiting groove 110 for mounting a first permanent magnet 20 and a second limiting groove 120 for mounting a second permanent magnet 30. At least a portion of the second limiting groove 120 is at a distance from the stator 80 that is less than the distance between the first limiting groove 110 and the stator 80. At least a portion of the second permanent magnet 30 is movably disposed inside the second limiting groove 120.

[0052] Specifically, a first limiting groove 110 and a second limiting groove 120 are provided on the main body for installing a first permanent magnet 20 and a second permanent magnet 30. The first permanent magnet 20 is fixedly disposed inside the first limiting groove 110, and at least a portion of the second permanent magnet 30 is movably disposed inside the second limiting groove 120.

[0053] Furthermore, the side of the first limiting groove 110 closest to the axis of the body portion 10 is designated as the first side, and the side of the first limiting groove 110 furthest from the axis of the body portion 10 is designated as the second side; similarly, the side of the second limiting groove 120 closest to the axis of the body portion 10 is designated as the first side, and the side of the second limiting groove 120 furthest from the axis of the body portion 10 is designated as the second side. The distance W2 between at least a portion of the first side and the second side of the second limiting groove 120 is greater than the distance W1 between the first side and the second side of the first limiting groove 110.

[0054] The distance between the second side of the first limiting groove 110 and the axis of the main body 10 is R1, and the distance between at least a portion of the second side of the second limiting groove 120 and the axis of the main body 10 is R2, where R2 > R1.

[0055] It should be noted that the first permanent magnet 20 and the second permanent magnet 30 inside the motor adopt the same permanent magnet structure. In this embodiment, at least a part of the second limiting groove 120 provides the second permanent magnet 30 with a space for movement, so that at least a part of the second permanent magnet 30 moves toward the stator 80 due to the centrifugal force during the high-speed rotation of the rotor assembly.

[0056] In this embodiment, the distance between the first side of the first limiting groove 110 near the axis of the body portion 10 and the first side of the second limiting groove 120 near the axis of the body portion 10 and the axis of the body portion 10 is equal. The distance between at least a portion of the second side of the second limiting groove 120 opposite to the first side and the stator 80 is less than the distance between the first limiting groove 110 and the stator 80. At least a portion of the second permanent magnet 30 moves between the first side and the second side of the second limiting groove 120.

[0057] like Figures 1 to 2As shown, along the axial direction of the rotor assembly, the wall of the second side of the second limiting groove 120 is a sloping structure. The distance between the wall of the second side and the wall of the first side gradually increases in the direction toward the first balance block 50, so that the groove opening of the second limiting groove 120 at the end toward the first balance block 50 is larger than the groove opening of the second limiting groove 120 at the end away from the first balance block 50.

[0058] The length of the groove opening at the end of the second limiting groove 120 facing the first balance block 50 is L1, and the length of the groove opening at the end of the second limiting groove 120 away from the first balance block 50 is L2, where L1 > L2.

[0059] Furthermore, the wall of the second side of the second limiting groove 120 is a sloped structure, so that when the second permanent magnet 30 is in the second position, the second permanent magnet 30 abuts against the sloped structure, and the distance between the end of the second permanent magnet 30 near the first balance block 50 and the stator 80 along the axial direction of the body 10 is less than the distance between the first permanent magnet 20 and the stator 80.

[0060] In this embodiment, the opening of the second limiting groove 120 away from the first balance block 50 along the axial direction of the main body 10 is the same size as the opening of the first limiting groove 110. The end of the second permanent magnet 30 away from the first balance block 50 is installed at the end of the second limiting groove 120 away from the first balance block 50. The end of the second permanent magnet 30 facing the first balance block 50 moves toward or away from the first balance block 50 at the end of the second limiting groove 120 facing the first balance block 50, thereby achieving the effect of the second permanent magnet 30 swinging inside the second limiting groove 120, thereby achieving the second permanent magnet 30 being movably set inside the second limiting groove 120.

[0061] like Figures 1 to 2 As shown, along the circumference of the main body 10, a first permanent magnet 20 is formed in a first region, and a second permanent magnet 30 is formed in a second region. The second region is not larger than the first region and is located on the side opposite to the first balance block 50.

[0062] Specifically, the first region and the second region cooperate to form a circular region, the first balancing block 50 is located on the same side as the first region, and the second region is located on the opposite side of the first balancing block 50.

[0063] The second region is no larger than the semicircular region opposite to the first balancing block 50. Furthermore, along the circumference of the body portion 10, the second region is located inside the region at a central angle of ±120° from the first balancing block 50.

[0064] Of course, it is not limited to the area where the second region is located within the central angle of the first balancing block 50 at a distance of ±120° from the first balancing block; the size of the second region can also be adaptively set as needed.

[0065] In this embodiment, the number of second permanent magnets 30 located in the second region is n, and the number of first permanent magnets 20 located in the first region is m, where 1≤n≤m.

[0066] Furthermore, the main body 10 has a cylindrical structure, and at least one pair of first permanent magnets 20 are provided inside the first region. When multiple pairs of first permanent magnets 20 are provided, the multiple pairs of first permanent magnets 20 are arranged consecutively, and the two first permanent magnets 20 in each pair are symmetrically arranged about a certain reference diameter. The two first permanent magnets 20 in each pair are arranged corresponding to one of the diameters of the main body 10, and this diameter is the reference diameter of the pair of first permanent magnets 20. The line of symmetry between the two first permanent magnets 20 in the pair is collinear with the corresponding reference diameter.

[0067] Furthermore, at least one pair of second permanent magnets 30 are provided within the second region. When multiple pairs of second permanent magnets 30 are provided, multiple pairs of first permanent magnets 20 are arranged consecutively, and the two second permanent magnets 30 in each pair are symmetrically arranged about a certain reference diameter. The two second permanent magnets 30 in each pair are arranged corresponding to one of the diameters of the body portion 10, which is the reference diameter of the pair of second permanent magnets 30. The line of symmetry between the two second magnets in the pair is collinear with the corresponding reference diameter.

[0068] In this embodiment, the two first permanent magnets 20 arranged in pairs form a V-shaped structure, the two second permanent magnets 30 arranged in pairs form a V-shaped structure, and the adjacent first permanent magnets 20 and second permanent magnets 30 form a V-shaped structure. This enables the paired first permanent magnets 20 and paired second permanent magnets 30 to form multiple V-shaped structures arranged along the circumference, thereby achieving a magnetic focusing effect and improving the magnetic flux density of the motor.

[0069] like Figures 1 to 2 As shown, the motor also includes an axial limiting member 610 and a radial limiting member 620. The axial limiting member 610 includes a baffle. Along the axial direction of the body part 10, the baffle is disposed at the opening of the first limiting groove 110 and the second limiting groove 120. The radial limiting member 620 is a protruding structure. The protruding structure is respectively disposed on the first side and the second side wall of the first limiting groove 110 and the second limiting groove 120.

[0070] Specifically, the baffle is used to block the opening of the first limiting groove 110 and the opening of the second limiting groove 120 to limit the first permanent magnet 20 and the second permanent magnet 30, so as to prevent the first permanent magnet 20 and the second permanent magnet 30 from being axially displaced during the rotation of the rotor assembly, which would cause the motor to fail to operate normally.

[0071] Furthermore, the radial limiting member 620 is a protruding structure, which is respectively disposed on the first and second side walls of the first limiting groove 110 and the second limiting groove 120. The protruding structures on the first and second side walls of the first limiting groove 110 fix the first permanent magnet 20 within the first limiting groove 110; the protruding structures on the first and second side walls of the second limiting groove 120 allow at least a portion of the second permanent magnet 30 to move between the protruding structures on both sides.

[0072] like Figures 1 to 2 As shown, the motor also includes a reset structure, which is disposed on the main body 10. The reset structure provides driving force for at least a portion of the second permanent magnet 30 to move toward the first balance block 50.

[0073] Specifically, under the driving force of the reset structure, the second permanent magnet 30 can have a tendency to move toward the first position.

[0074] Furthermore, the rotor assembly has a first speed state and a second speed state, and the speed of the rotor assembly in the first speed state is greater than the speed of the rotor assembly in the second speed state. When the rotor assembly is in the first speed state, the centrifugal force on the first balance block 50 is greater than the centrifugal force on the first balance block 50 when the rotor assembly is in the second speed state.

[0075] In this embodiment, when the rotor assembly is at the first speed state, the centrifugal force of the second permanent magnet 30 is greater than the driving force of the reset structure, and at least a portion of the second permanent magnet 30 moves to a position where the distance between it and the stator 80 is less than the distance between the first permanent magnet 20 and the stator 80; when the rotor assembly switches from the first speed state to the second speed state, the driving force of the reset structure is greater than the centrifugal force of the second permanent magnet 30, and at least a portion of the second permanent magnet 30 moves toward the direction of the first balance block 50.

[0076] like Figures 1 to 2 As shown, the reset structure includes a third permanent magnet 40, which is disposed on the body part 10. The third permanent magnet 40 is located between the second permanent magnet 30 and the first balance block 50. The magnetic poles of the third permanent magnet 40 and the second permanent magnet 30 are opposite to each other on the side they face.

[0077] Specifically, the magnetic poles of the third permanent magnet 40 and the second permanent magnet 30 are opposite to each other on one side, thus forming a magnetic attraction between them. Under the influence of this magnetic attraction, the second permanent magnet 30 tends to move towards the third permanent magnet 40. When the magnetic attraction of the third permanent magnet 40 is greater than the centrifugal force of the second permanent magnet 30 and the force between the second permanent magnet 30 and the stator 80, the second permanent magnet 30 moves away from the stator 80 under the influence of the magnetic attraction of the third permanent magnet 40.

[0078] Furthermore, the distance between the third permanent magnet 40 and the second permanent magnet 30 is no greater than the distance between the third permanent magnet 40 and the first balance block 50. By placing the third permanent magnet 40 close to the second permanent magnet 30, the amount of material used in the third permanent magnet 40 is reduced, which helps to lower costs while ensuring that the third permanent magnet 40 can provide a stable magnetic attraction force.

[0079] In this embodiment, the third permanent magnet 40 and the second permanent magnet 30 are arranged in a one-to-one correspondence. The third permanent magnet 40 is located on the extension line of the second side of the second limiting groove 120 on the corresponding body part 10 facing the first side. This allows at least a portion of the second permanent magnet 30 to move between the first side and the second side of the second limiting groove 120 under the magnetic attraction of the third magnet.

[0080] like Figures 1 to 2 As shown, along the axial direction of the body portion 10, the length of the third permanent magnet 40 is less than the length of the second permanent magnet 30, and the third permanent magnet 40 is disposed on the body portion 10 near one end of the first balance block 50.

[0081] Specifically, in order to reduce the material of the third permanent magnet 40, the third permanent magnet 40 is disposed at one end close to the first balance block 50 along the axial direction of the body portion 10.

[0082] It should be noted that the length of the third permanent magnet 40 can be equal to the length of the second permanent magnet 30, or the length of the third permanent magnet 40 can be greater than the length of the second permanent magnet 30.

[0083] Furthermore, the balancing part also includes a second balancing block 70, which is disposed on the body part 10 at one end away from the first balancing block 50. The second balancing block 70 is used to balance the centrifugal force of the first balancing block 50.

[0084] In this embodiment, the second balance block 70 and the first balance block 50 are spaced 180° apart along the circumference of the main body 10.

[0085] Example 2

[0086] Unlike Embodiment 1, in this embodiment, as Figure 3 As shown, along the axial direction of the rotor assembly, the second limiting groove 120 includes a plurality of groove segments 121 connected together, and the distance between the second side of at least one groove segment 121 and the stator 80 is less than the distance between the first limiting groove 110 and the stator 80.

[0087] Specifically, the first side of the multiple slot segments 121 of the second limiting groove 120 shares a common wall surface, and the second side of one or more slot segments 121 of the second limiting groove 120 is located close to the stator 80.

[0088] Furthermore, the second permanent magnet 30 includes a plurality of magnet segments 310, and at least one magnet segment 310 is disposed inside each slot segment 121. Among them, the magnet segment 310 located inside the slot segment 121 near the stator 80 on the second side is movably disposed so as to move toward or away from the stator 80 inside the slot segment 121.

[0089] Furthermore, the number of multiple slot segments 121 does not exceed four, to avoid the problem of excessive slot segments 121 leading to high processing difficulty and magnetic force imbalance between the second permanent magnet 30 and the stator 80.

[0090] Furthermore, when the distance between the second side of a portion of the multiple slot segments 121 and the stator 80 is less than the distance between the first limiting slot 110 and the stator 80, the distance between the second side of another portion of the multiple slot segments 121 and the stator 80 is equal to the distance between the first limiting slot 110 and the stator 80.

[0091] Furthermore, the slot segment 121 is arranged in a one-to-one correspondence with the magnet segment 310 to facilitate the movable arrangement of at least one magnet segment 310 of the second permanent magnet 30.

[0092] In this embodiment, the distance between the second side of the slot 121 closest to the first balance block 50 and the stator 80 is greater than the distance between the first limiting slot 110 and the stator 80.

[0093] Example 3

[0094] Unlike Embodiment 1, in this embodiment, the reset structure is not limited to the structure using the third permanent magnet 40.

[0095] Specifically, the reset structure includes a reset member, which is disposed on the first or second side of the second limiting groove 120 on the body part 10. The reset member provides a driving force for the second permanent magnet 30 to move toward the first balance block 50.

[0096] When the reset member is located on the first side of the second limiting groove 120, the reset member is a tension spring that provides a pulling force to the second permanent magnet 30 to move away from the stator; when the reset member is located on the first side of the first limiting groove 110, the reset member is a compression spring that provides a pushing force to the second permanent magnet 30 to move away from the stator.

[0097] Example 4

[0098] This invention provides a compressor, such as Figure 4 As shown, the compressor includes a motor and a pump body assembly 90, wherein the motor is the motor described in Embodiment 1, Embodiment 2, or Embodiment 3.

[0099] Furthermore, the rotor assembly of the motor also includes a crankshaft 100, one end of which is connected to the body portion 10 of the rotor assembly, and the other end of which is connected to the pump body assembly 90.

[0100] As can be seen from the above description, the embodiments of the present invention achieve the following technical effects:

[0101] This application employs a structure in which at least a portion of the second permanent magnet 30 is movable, thereby enabling the second permanent magnet 30 to move toward or away from the stator 80. When the movable second permanent magnet 30 moves toward the stator 80, the magnetic force between the second permanent magnet 30 and the stator 80 increases, thereby overcoming the centrifugal force on the first balance block 50, achieving overall rotational balance of the rotor assembly, reducing noise, improving the rotational stability of the rotor assembly, and ensuring the normal operation of the compressor.

[0102] Obviously, the embodiments described above are merely some, not all, embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention.

[0103] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0104] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0105] 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 (80); The rotor assembly is disposed inside the stator (80). The rotor assembly includes a body part (10), a first permanent magnet (20) fixedly disposed on the body part (10), and a second permanent magnet (30) movably disposed on the body part (10) at least part of which is movably disposed on the body part (10). The second permanent magnet (30) moves toward or away from the stator (80). The balancing part includes at least a first balancing block (50) disposed at one end of the body part (10) in the axial direction, and a second permanent magnet (30) disposed circumferentially opposite to the first balancing block (50) in the body part (10). Along the circumferential direction of the body portion (10), the first permanent magnet (20) is formed in a first region, and the second permanent magnet (30) is formed in a second region; The motor also includes a reset structure disposed on the body part (10), which provides a driving force for at least a portion of the second permanent magnet (30) to move toward the first balance block (50).

2. The motor according to claim 1, characterized in that, The second permanent magnet (30) has at least a first position and a second position. When at least a portion of the second permanent magnet (30) is located in the first position, the distance between at least a portion of the second permanent magnet (30) and the stator (80) is equal to the distance between the first permanent magnet (20) and the stator (80); When at least a portion of the second permanent magnet (30) is located in the second position, the distance between at least a portion of the second permanent magnet (30) and the stator (80) is less than the distance between the first permanent magnet (20) and the stator (80).

3. The motor according to claim 1, characterized in that, The first part of the second permanent magnet (30) is movably disposed toward or away from the stator (80), and the first part is located at one end near the first balance block (50) along the axial direction of the body part (10).

4. The motor according to claim 1, characterized in that, The main body (10) has a first limiting groove (110) for mounting the first permanent magnet (20) and a second limiting groove (120) for mounting the second permanent magnet (30). At least a portion of the second limiting groove (120) is at a distance from the stator (80) less than the distance between the first limiting groove (110) and the stator (80). At least a portion of the second permanent magnet (30) is movably disposed inside the second limiting groove (120).

5. The motor according to claim 4, characterized in that, The distance between the first side of the first limiting groove (110) near the axis of the body part (10) and the first side of the second limiting groove (120) near the axis of the body part (10) and the axis of the body part (10) are equal. At least a portion of the second side opposite to the first side of the second limiting groove (120) is at a distance from the stator (80) less than the distance between the first limiting groove (110) and the stator (80), and at least a portion of the second permanent magnet (30) moves between the first side and the second side of the second limiting groove (120).

6. The motor according to claim 5, characterized in that, Along the axial direction of the rotor assembly, the wall of the second side of the second limiting groove (120) is a slope structure, and the distance between the wall of the second side and the wall of the first side gradually increases in the direction toward the first balance block (50), so that the groove opening of the second limiting groove (120) at one end toward the first balance block (50) is larger than the groove opening of the second limiting groove (120) at one end away from the first balance block (50).

7. The motor according to claim 6, characterized in that, The opening of the second limiting groove (120) at the end away from the first balance block (50) is the same size as the opening of the first limiting groove (110).

8. The motor according to claim 5, characterized in that, Along the axial direction of the rotor assembly, The second limiting groove (120) includes a plurality of groove segments (121) connected in series, and the distance between the second side of at least one of the groove segments (121) and the stator (80) is less than the distance between the first limiting groove (110) and the stator (80); The second permanent magnet (30) includes a plurality of magnet segments (310), and at least one of the magnet segments (310) is disposed inside each of the slot segments (121).

9. The motor according to claim 8, characterized in that, The number of the plurality of said slot segments (121) shall not exceed four; and / or The distance between the second side of a portion of the plurality of slot segments (121) and the stator (80) is less than the distance between the first limiting slot (110) and the stator (80), and the distance between the second side of another portion of the plurality of slot segments (121) and the stator (80) is equal to the distance between the first limiting slot (110) and the stator (80); and / or The slot segment (121) and the magnet segment (310) are arranged in a one-to-one correspondence.

10. The motor according to claim 8, characterized in that, The distance between the second side of the slot (121) closest to the first balance block (50) and the stator (80) is greater than the distance between the first limiting slot (110) and the stator (80).

11. The motor according to claim 1, characterized in that, The second region is not larger than the first region, and the second region is located on the side opposite to the first balance block (50).

12. The motor according to claim 11, characterized in that, Along the circumference of the body portion (10), the second region is located inside the region at a central angle of ±120° from the first balance block (50); and / or The number of the second permanent magnet (30) is n, and the number of the first permanent magnet (20) is m, 1≤n≤m.

13. The motor according to claim 11, characterized in that, At least one pair of the first permanent magnets (20) are provided within the first region. When there are multiple pairs of the first permanent magnets (20), the multiple pairs of the first permanent magnets (20) are arranged continuously, and the two first permanent magnets (20) in each pair are arranged symmetrically about a certain reference diameter. The second permanent magnet (30) inside the second region is provided with at least one pair. When there are multiple pairs of the second permanent magnet (30), the multiple pairs of the first permanent magnet (20) are arranged continuously, and the two pairs of the second permanent magnet (30) are arranged symmetrically about a certain reference diameter.

14. The motor according to claim 13, characterized in that, The two first permanent magnets (20) arranged in pairs form a V-shaped structure between them; and / or The two second permanent magnets (30) arranged in pairs form a V-shaped structure; and / or The adjacent first permanent magnet (20) and second permanent magnet (30) form a V-shaped structure.

15. The motor according to claim 4, characterized in that, The motor also includes: An axial limiting member (610) includes a baffle along the axial direction of the body part (10), and the baffle is disposed at the opening of the first limiting groove (110) and the second limiting groove (120). Radial limiting member (620), the radial limiting member (620) is a protruding structure, the protruding structure is respectively disposed on the first side and the second side wall surface of the first limiting groove (110) and the second limiting groove (120).

16. The motor according to any one of claims 1 to 15, characterized in that, The rotor assembly has a first speed state and a second speed state, wherein the speed of the rotor assembly in the first speed state is greater than the speed of the rotor assembly in the second speed state. When the rotor assembly is at the first rotational speed, the centrifugal force of the second permanent magnet (30) is greater than the driving force of the reset structure, and at least a portion of the second permanent magnet (30) moves to a position where the distance between it and the stator (80) is less than the distance between the first permanent magnet (20) and the stator (80). When the rotor assembly switches from the first speed state to the second speed state, the driving force of the reset structure is greater than the centrifugal force of the second permanent magnet (30), and at least a portion of the second permanent magnet (30) moves toward the first balance block (50).

17. The motor according to any one of claims 1 to 15, characterized in that, The reset structure includes a reset member disposed on the first or second side of the second limiting groove (120) on the body part (10), and the reset member provides a driving force for the second permanent magnet (30) to move toward the first balance block (50).

18. The motor according to any one of claims 1 to 15, characterized in that, The reset structure includes: The third permanent magnet (40) is disposed on the body part (10). The third permanent magnet (40) is located between the second permanent magnet (30) and the first balance block (50). The magnetic poles of the third permanent magnet (40) and the second permanent magnet (30) are opposite to each other on the side they face.

19. The motor according to claim 18, characterized in that, The distance between the third permanent magnet (40) and the second permanent magnet (30) is no greater than the distance between the third permanent magnet (40) and the first balance block (50).

20. The motor according to claim 18, characterized in that, The third permanent magnet (40) is provided in a one-to-one correspondence with the second permanent magnet (30), and the third permanent magnet (40) is located on the extension line of the second side of the second limiting groove (120) on the corresponding body part (10) facing the first side.

21. The motor according to claim 18, characterized in that, Along the axial direction of the body part (10), the length of the third permanent magnet (40) is less than the length of the second permanent magnet (30), and the third permanent magnet (40) is disposed on the body part (10) at one end near the first balance block (50).

22. The motor according to any one of claims 1 to 15, characterized in that, The balancing part further includes a second balancing block (70), which is disposed on the body part (10) at one end away from the first balancing block (50).

23. The motor according to claim 22, characterized in that, Along the circumference of the main body (10), the second balance block (70) and the first balance block (50) are spaced 180° apart.

24. A compressor, characterized in that, The compressor includes the motor according to any one of claims 1 to 23.

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