Rotor, motor, water pump and vehicle

Abstract

The present invention provides a rotor, a motor, a water pump and a vehicle. The rotor includes: a rotor core, in which a shaft hole for accommodating a rotating shaft and an installation groove for installing a permanent magnet are provided; a permanent magnet, installed in the installation groove; a plastic-coated body, connected to the rotor core and covering at least the open end of the installation groove to encapsulate the permanent magnet in the rotor core; wherein, at least one end of the plastic-coated body is provided with an axially extending portion, and the radially inner end of the axially extending portion is flush with the inner side surface of the rotor core. For the rotor provided by the present invention, by providing the axially extending portion, the axial distance between the rotor core and the external gas or liquid is increased, and further, it can effectively prevent the external gas or liquid from contacting the rotor core or even entering the interior of the rotor core through the gap between the housing and the rotating shaft, thereby preventing the corrosion of the rotor core, playing an anti-rust role, and also preventing the contamination of the liquid.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular, to a rotor, a motor including the rotor, a water pump including the motor, and a vehicle including the water pump. Background Art

[0002] Currently, for existing motor rotors, if they operate in a liquid environment or an environment with relatively high humidity, the liquid or moisture will pass through the gap between the housing (such as a plastic-coated body) and the rotating shaft and come into contact with the rotor core, which not only corrodes the rotor core but also contaminates the conveyed liquid. Summary of the Invention

[0003] In order to solve at least one of the above technical problems, the first object of the present invention is to provide a rotor.

[0004] The second object of the present invention is to provide a motor including the above rotor.

[0005] The third object of the present invention is to provide a water pump including the above motor.

[0006] The fourth object of the present invention is to provide a vehicle including the above water pump.

[0007] To achieve the above object, a technical solution of the first aspect of the present invention provides a rotor, including: a rotor core, an axial hole for accommodating a rotating shaft and an installation groove for installing a permanent magnet are provided in the rotor core; a permanent magnet, installed in the installation groove; a plastic-coated body, connected to the rotor core and covering at least the open end of the installation groove to encapsulate the permanent magnet in the rotor core; wherein, at least one end of the plastic-coated body is provided with an axially extending portion, and the radially inner end of the axially extending portion is flush with the inner side surface of the rotor core.

[0008] For the rotor provided by the technical solution of the first aspect of the present invention, by providing an axially extending portion at at least one end of the plastic-coated body, and the radially inner end of the axially extending portion is flush with the inner side surface of the rotor core, this can increase the axial distance between the rotor core and the external gas or liquid, and thus can effectively prevent the external gas or liquid from contacting the rotor core or even entering the interior of the rotor core through the gap between the plastic-coated body and the rotating shaft, thereby preventing the corrosion of the rotor core and playing an anti-rust role, and at the same time can also prevent the contamination of the liquid.

[0009] Moreover, the axially extending portion will be tightly combined with the rotating shaft, increasing the contact area between the plastic-coated body and the rotating shaft, improving the bonding strength between the plastic-coated body and the rotating shaft, extending the axial mating length between the plastic-coated body and the rotating shaft, and the axially extending portion is also connected to the end layer of the plastic-coated body, increasing the strength of the plastic-coated body.

[0010] In addition, the rotor in the above technical solution provided by the present invention may further have the following additional technical features:

[0011] In the above technical solution, at least one end face of the rotor core is provided with a filling groove, and the filling groove communicates with the shaft hole; the axially extending portion includes a filling portion, and the filling portion is filled in the filling groove of the rotor core.

[0012] By providing a filling groove on at least one end face of the rotor core, since the filling groove communicates with the shaft hole, when injection molding, the liquid plastic will flow into the filling groove and finally solidify to form a filling portion. The filling portion will be tightly combined with the rotating shaft, increasing the contact area between the plastic-coated body and the rotating shaft, improving the bonding strength between the plastic-coated body and the rotating shaft, extending the axial mating length between the plastic-coated body and the rotating shaft, thereby increasing the axial distance between the rotor core and the external gas or liquid, and effectively preventing the external gas or liquid from contacting the rotor core through the plastic-coated body or even entering the interior of the rotor core, thus preventing the corrosion of the rotor core and playing an anti-rust role, and at the same time preventing the contamination of the liquid. Moreover, the filling portion and the end layer of the plastic-coated body are connected together, increasing the strength of the plastic-coated body.

[0013] Among them, the filling portion is equivalent to the plastic-coated body adopting an inwardly concave form, extending the axial distance between the rotor core and the external liquid or gas.

[0014] In the above technical solution, the filling groove surrounds the shaft hole, and the outer contour of the filling groove is circular, polygonal or petal-shaped.

[0015] If the filling groove surrounds the shaft hole, the filling portion in the filling groove also surrounds the rotating shaft and is tightly combined with the rotating shaft, which is beneficial to further prevent the external gas or liquid from contacting the rotor core through the plastic-coated body or even entering the interior of the rotor core, improving the reliability of product use and the bonding strength between the filling portion and the rotating shaft.

[0016] In the above technical solution, the axial depth H of the filling groove is in the range of 2 mm to 10 mm; and / or the ratio of the axial depth H of the filling groove to the axial length L of the rotor core is in the range of 0.03 to 0.3; and / or the outer contour of the filling groove has a circumscribed circle, and the ratio of the diameter W of the circumscribed circle to the diameter d of the outer contour of the rotor core is in the range of 0.24 to 0.57.

[0017] Limiting the axial depth of the filling groove within the range of 2 mm to 10 mm can avoid the situation that the role of the filling portion is too weak due to too small axial depth and the reduction of the strength of the rotor core due to too large axial depth.

[0018] The ratio of the axial depth of the filling groove to the axial length of the rotor core is limited within the range of 0.03 to 0.3, which not only avoids the overly weak effect of the filling part due to too small axial depth, but also avoids the reduction of the strength of the rotor core due to too large axial depth.

[0019] The ratio of the diameter of the circumscribed circle of the filling groove to the diameter of the outer contour of the rotor core is limited within the range of 0.24 to 0.57, which not only avoids the overly weak effect of the filling part due to too small radial width, but also avoids the reduction of the strength of the rotor core due to too large radial width.

[0020] In any of the above technical solutions, at least one clearance groove is provided on the inner side surface of the rotor core, the clearance groove axially penetrates at least one end surface of the rotor core along the axis of the rotor, and the plastic-coated body includes a clearance part filled in the clearance groove.

[0021] In the prior art, when the rotating shaft is in interference fit with the shaft hole, there is a problem that the pressing force is too large when the rotating shaft is inserted into the rotor core, which easily causes the rotating shaft to be bent. In this application, a clearance groove is provided on the inner side surface of the rotor core, which can reduce the contact area between the rotor core and the rotating shaft, thereby reducing the frictional force received when the rotating shaft is pressed in, and is beneficial to assembly. By controlling the number and size of the clearance grooves, the fitting area between the rotating shaft and the inner hole of the rotor core can be determined, which is convenient for calculating the pressing force and is beneficial to assembly.

[0022] In addition, by providing a clearance groove on the inner side surface of the rotor core, since the clearance groove axially penetrates at least one end surface of the rotor core along the axis of the rotor, when injection molding, the liquid plastic will flow into the clearance groove and finally solidify to form a clearance part, which is tightly combined with the rotating shaft. This increases the contact area between the plastic-coated body and the rotating shaft, improves the bonding strength between the plastic-coated body and the rotating shaft, can effectively prevent external gas or liquid from contacting the rotor core through the plastic-coated body and even entering the inside of the rotor core, thereby preventing the corrosion of the rotor core and playing an anti-rust role; at the same time, it can also prevent polluting liquids; and it also increases the strength of the plastic-coated body, making the combination of the rotor core and the plastic-coated body more compact. And, the clearance part can be connected to at least one end layer of the plastic-coated body, increasing the strength of the plastic-coated body.

[0023] In the above technical solution, the ratio of the remaining arc length A of the inner side surface of the rotor core to the circumference B of the shaft hole is within the range of 0.3 to 0.7; and / or the ratio of the remaining area Sa of the inner side surface of the rotor core to the complete area Sb of the hole wall of the shaft hole is within the range of 0.3 to 0.7; and / or the ratio of the radial depth C of the clearance groove to the diameter D of the shaft hole is within the range of 0.0625 to 0.375.

[0024] In the above technical solution, the ratio of the remaining arc length A of the inner side surface of the rotor core to the circumference B of the shaft hole ranges from 0.4 to 0.5; and / or the ratio of the remaining area Sa of the inner side surface of the rotor core to the complete area Sb of the hole wall of the shaft hole ranges from 0.4 to 0.5; and / or the ratio of the radial depth C of the clearance groove to the diameter D of the shaft hole ranges from 0.2 to 0.3.

[0025] The radial open end of the clearance groove refers to the open end of the clearance groove facing the central axis of the shaft hole. The surface where this open end is located is a part of a cylindrical surface, and the cross-section is an arc shape. The arc length of this cross-section is the arc length of the radial open end of the clearance groove. The remaining arc length of the inner side surface of the rotor core refers to the circumference of the inner side surface where no clearance groove is opened (i.e., the circumferential B of the shaft hole) minus the total arc length of all the radial open ends of the clearance grooves, that is, the arc length of the part of the inner side surface of the rotor core (where the clearance groove is opened) in contact with the rotating shaft. Limiting the ratio of the remaining arc length A of the inner side surface of the rotor core to the circumference B of the shaft hole within the range of 0.3 to 0.7, and further limiting it within the range of 0.4 to 0.5, can both avoid the clearance groove being too narrow resulting in too weak a function of the clearance part, and avoid the clearance groove being too wide resulting in a reduction in the strength of the rotor core.

[0026] The complete area Sb of the hole wall of the shaft hole refers to the total area of the hole wall of the shaft hole where no clearance groove is opened. The remaining area of the inner side surface of the rotor core refers to the total area of the inner side surface where no clearance groove is opened (i.e., the complete area Sb of the hole wall of the shaft hole) minus the total area of all the radial open ends of the clearance grooves, that is, the area of the part of the inner side surface of the rotor core (where the clearance groove is opened) in contact with the rotating shaft. Limiting the ratio of the remaining area Sa of the inner side surface of the rotor core to the complete area Sb of the hole wall of the shaft hole within the range of 0.3 to 0.7, and further limiting it within the range of 0.4 to 0.5, can both avoid the clearance groove being too narrow resulting in too weak a function of the clearance part, and avoid the clearance groove being too wide resulting in a reduction in the strength of the rotor core.

[0027] In any of the above technical solutions, the axial extension portion includes an extension part, and the extension part is provided on the end surface of the plastic coating body and extends along the axial direction of the rotor away from the rotor core.

[0028] By providing an extension part on the end surface of the plastic coating body, since the extension part extends along the axial direction of the rotor and away from the rotor core, it can also increase the axial distance between the rotor core and the external gas or liquid, and can also extend the axial mating length between the plastic coating body and the rotating shaft, which is beneficial to preventing the external gas or liquid from contacting the rotor core or even entering the inside of the rotor core through the plastic coating body, improving the use reliability of the product, and improving the bonding strength between the plastic coating body and the rotating shaft. Among them, the extension part is equivalent to the plastic coating body adopting an outward convex form to extend the axial distance between the rotor core and the external liquid or gas.

[0029] In any of the above technical solutions, the rotor also includes: a gasket, which is coaxially arranged with the rotor core, and the gasket is provided with a positioning structure for directly or indirectly positioning the position of the permanent magnet; wherein the plastic-encapsulating body covers the portion of the rotor core exposed to the axial hole and the portion exposed to the gasket, and covers the portion of the gasket exposed to the axial hole, and forms an integrated structure with the rotor core and the gasket.

[0030] The gasket is provided with a positioning structure, which can directly or indirectly position the permanent magnet in the rotor core. The magnetization position of the permanent magnet can be accurately located according to the position of the permanent magnet, thereby improving the accuracy of subsequent magnetization and ensuring that the permanent magnet is fully magnetized.

[0031] In addition, compared with setting a positioning structure on the plastic package, the size of the positioning structure on the gasket can be significantly reduced, or the outer contour of the gasket (such as the outer contour of a polygonal gasket) can be directly used as the positioning structure, thereby simplifying the design of the positioning structure and avoiding the need to set an additional positioning structure on the plastic package, thereby simplifying the structure of the plastic package and simplifying the processing technology of the plastic package.

[0032] During the production process, the rotor core and the gasket are first mounted on the rotating shaft, the gasket and the mounting groove are installed in a certain relative position relationship, and then the permanent magnet is placed, and then the liquid plastic is injected into the mold for injection molding. After the liquid plastic solidifies into a plastic-encapsulated body, an integrated rotor sealed by injection molding can be obtained. Since the plastic-encapsulated body completely wraps the part of the rotor core exposed to the rotating shaft and the gasket, and the part of the gasket exposed to the rotating shaft, it is ensured that the rotor core can be stably and securely sealed inside the plastic-encapsulated body or inside the outer cover formed by the plastic-encapsulated body and the gasket, and will not shift or even fall out, and it is also ensured that the gasket will not shift or fall out, which improves the reliability of the motor. At the same time, it also saves tedious processes such as fastener fixation, which is conducive to simplifying the processing process and improving the preparation efficiency.

[0033] At the same time, during the injection molding process, liquid plastic can enter the filling groove and the air avoidance groove, and then solidify to form a filling part and an air avoidance part. There is no need to set up an additional filling part and perform a filling process, which improves assembly efficiency and also improves the bonding strength between the plastic body and the shaft.

[0034] In any of the above technical solutions, the plastic-coated body includes a first end layer and a second end layer. The first end layer covers one end face of the rotor core and covers a part of the gasket. The second end layer covers the other end face of the rotor core. The first end layer includes a first end portion and a second end portion. The first end portion and the second end portion are sequentially connected from the inside to the outside along the radial direction of the rotor. The diameter D2 of the outer contour of the first end portion is smaller than the diameter D3 of the outer contour of the second end portion. The first end portion covers a part of the gasket and a part of the first end portion corresponds to the end face of the permanent magnet. The second end layer includes a third end portion and a fourth end portion. The third end portion and the fourth end portion are sequentially connected from the outside to the inside along the radial direction of the rotor. The diameter D4 of the outer contour of the third end portion is larger than the diameter D5 of the outer contour of the fourth end portion.

[0035] In the above technical solution, the thickness of the first end portion is greater than the thickness T3 of the second end portion; the thickness T4 of the third end portion is smaller than the thickness T5 of the fourth end portion.

[0036] Since the external gas or liquid penetrates inward between the plastic-coated body and the rotating shaft and then contacts the rotor core or enters the inside of the rotor core, the part of the end face of the rotor core closer to the inside in the radial direction is more likely to be corroded. For this reason, in this solution, the two end layers of the plastic-coated body are designed with a non-uniform thickness structure. The first end portion and the fourth end portion closer to the inside in the radial direction are relatively thick, and the second end portion and the third end portion closer to the outside in the radial direction are relatively thin, which is equivalent to locally thickening the radial inside of the two end layers. This increases the distance between the part of the end face of the rotor core closer to the inside in the radial direction and the external gas or liquid, which is beneficial to preventing the external gas or liquid from entering the rotor core and corroding the rotor core. At the same time, compared with thickening the two end layers as a whole, raw materials are saved, the production cost is reduced, and the product weight is also reduced. In addition, a part of the first end portion corresponds to the end face of the permanent magnet, which is beneficial to supporting the permanent magnet during injection molding and improving the stability of the position of the permanent magnet.

[0037] In the above technical solution, the first end portion includes a protruding portion and a supporting portion. The protruding portion and the supporting portion are sequentially connected from the inside to the outside along the radial direction of the rotor. The diameter D1 of the outer contour of the protruding portion is smaller than the diameter D2 of the outer contour of the supporting portion. A part of the gasket is embedded in the protruding portion and covered by the protruding portion. The supporting portion corresponds to the end face of the permanent magnet. The thickness T1 of the protruding portion is greater than the thickness T2 of the supporting portion; or an annular groove is provided on the side peripheral surface of the gasket, and a part of the first end portion is embedded in the annular groove to cover a part of the gasket.

[0038] The first end portion is designed with a non-uniform thickness structure. The radially inner protruding portion is relatively thick, and the radially outer supporting portion is relatively thin. A part of the gasket is embedded in the protruding portion and covered by the protruding portion, which further increases the distance between the radially inner part of the end face of the rotor core and the external gas or liquid, facilitating further prevention of the external gas or liquid from entering the rotor core and corroding the rotor core. The supporting portion corresponds to the position of the end face of the permanent magnet, which is conducive to supporting the permanent magnet during injection molding and improving the stability of the position of the permanent magnet.

[0039] The side peripheral surface of the gasket is provided with an annular groove, so the longitudinal section of the gasket is in an I shape. Since the gasket is sleeved on the rotating shaft and the opening of the annular groove faces radially outward, the annular groove is exposed outside the rotating shaft and does not contact the rotating shaft. A part of the first end portion is embedded in the annular groove, then the first end portion covers the groove wall of the annular groove and tightly combines with the groove wall of the annular groove to form an integral body, and the bonding force is relatively high and the fixation is relatively reliable, which can effectively prevent the axial relative movement between the gasket and the plastic-coated body. In addition, the gasket with this shape is relatively thick. On the basis of ensuring a relatively large distance between the radially inner part of the end face of the rotor core and the external gas or liquid, the thickness of the corresponding position of the first end portion can be reduced. For example, the first end portion can be directly designed with a uniform thickness structure, which is conducive to saving raw materials.

[0040] In any of the above technical solutions, the end face of the gasket facing away from the rotor core protrudes from the plastic-coated body.

[0041] Making the end face of the gasket facing away from the rotor core protrude from the plastic-coated body is beneficial in two aspects. On the one hand, it is conducive to increasing the layout range of the positioning structure, facilitating the reasonable design of the shape, position, quantity, etc. of the positioning structure according to needs to improve the positioning effect; on the other hand, it is also conducive to reducing the amount of plastic used, thereby saving raw materials. In addition, it can also prevent the plastic-coated body from rubbing and wearing against other structures and play a protective role for the plastic-coated body. Of course, the end face of the gasket facing away from the rotor core can also be flush with the end face of the plastic-coated body.

[0042] In the above technical solution, the axial height H1 of the end face of the gasket facing away from the rotor core protruding from the plastic-coated body is less than or equal to 5 mm.

[0043] Limiting the axial height H1 of the end face of the gasket facing away from the rotor core protruding from the plastic-coated body within the range of less than or equal to 5 mm not only avoids the too small exposed area of the gasket caused by too small H1, but also avoids the too weak bonding force between the gasket and the plastic-coated body caused by too large H1, thus improving the bonding strength between the gasket and the plastic-coated body.

[0044] In any of the above technical solutions, the shape of the outer contour of the gasket is circular or polygonal; and / or the gasket is provided with concave portions and / or convex portions.

[0045] The shape of the outer contour of the gasket is not specifically limited, including but not limited to circular or polygonal shapes, and can be specifically designed according to the specific structure of the product. Among them, for a polygon (the adjacent two sides can be connected by a rounded corner or a chamfer, or directly connected by a sharp corner) or other non-circular special-shaped structures, it can limit the circumferential relative rotation between the gasket and the plastic-coated body, thereby improving the connection reliability between the gasket and the plastic-coated body, and at the same time facilitating the use of the shape of the outer contour to locate the position of the permanent magnet (for example, directly using the outer contour of the polygonal gasket to locate the position of the permanent magnet).

[0046] Providing a concave portion, a convex portion, or both a concave portion and a convex portion on the gasket can play a good positioning role. Specifically, when these structures are provided at the portion where the gasket contacts the plastic-coated body, these structures can increase the contact area between the plastic-coated body and the gasket, thereby increasing the bonding force between the plastic-coated body and the gasket, making the gasket more firmly fixed and not easily loosened; and when these structures are not completely covered by the plastic-coated body, they can also be used to locate the position of the permanent magnet. When these structures are provided at the portion where the gasket does not contact the plastic-coated body, these structures can be used to locate the position of the permanent magnet; and these structures can also be used to contact the liquid, play a lubricating role, and reduce the contact area between the gasket and other structures, thereby reducing the frictional resistance and improving the heat generation due to friction.

[0047] In the above technical solution, the shape of the outer contour of the gasket is polygonal, and a plurality of concave portions are provided on at least one end face of the gasket, and the number of the concave portions on at least one end face is equal to the number of sides of the polygon and the plurality of concave portions are evenly distributed along the circumference of the gasket.

[0048] The shape of the outer contour of the gasket is polygonal, which can be a strictly defined polygon, that is, the adjacent two sides are directly connected by a sharp corner; or it can be a non-strictly defined polygon, such as the adjacent two sides are connected by a rounded corner or a chamfer. In this way, the contour of the gasket can be directly used to locate the position of the permanent magnet, effectively simplifying the product structure. A plurality of concave portions equal to the number of sides of the polygon are evenly provided along the circumference on at least one end face of the gasket, making the structure of the gasket more regular and facilitating processing and forming. Among them, when the above concave portions are provided on the end face of the gasket facing the rotor core, these concave portions can increase the contact area between the gasket and the plastic-coated body, thereby improving the bonding strength between the gasket and the plastic-coated body. When the above concave portions are provided on the end face of the gasket facing away from the rotor core, these concave portions can be used to locate the position of the permanent magnet and can also be used to accommodate the liquid, play a lubricating role, and improve the heat generation due to friction.

[0049] In any of the above technical solutions, the positioning structure includes the outer contour of the gasket; and / or the positioning structure includes the concave portion and / or the convex portion provided on the gasket.

[0050] Reasonably design the shape of the outer contour of the gasket according to the position of the permanent magnet. When assembling the gasket, make its outer contour correspond to the position of the installation groove. After the plastic coating is completed, the position of the permanent magnet can be located according to the outer contour of the gasket. The structure and principle are relatively simple and easy to implement.

[0051] Reasonably arrange the concave parts, convex parts, or the quantity, shape, and position of the concave parts and convex parts according to the position of the permanent magnet. When assembling the gasket, make these structures correspond to the position of the installation groove. After the plastic coating is completed, the position of the permanent magnet can be located according to the outer contour of the gasket. The structure and principle are relatively simple and easy to implement. In addition, when these concave parts and convex parts are arranged on the end face of the gasket facing away from the rotor core, the contact area between the gasket and other external structures can also be reduced, thereby improving heat generation due to friction.

[0052] The technical solution of the second aspect of the present invention provides a motor, including: a rotor as described in any one of the technical solutions of the first aspect; and a stator, sleeved outside the rotor and cooperating with the rotor.

[0053] The motor provided by the technical solution of the second aspect of the present invention includes the rotor as described in any one of the technical solutions of the first aspect, so it has all the beneficial effects of any of the above technical solutions, which will not be elaborated here.

[0054] The technical solution of the third aspect of the present invention provides a water pump, including: a motor as described in the technical solution of the second aspect; and an impeller, connected to the rotating shaft of the motor.

[0055] The water pump provided by the technical solution of the third aspect of the present invention includes the motor as described in any one of the technical solutions of the second aspect, so it has all the beneficial effects of any of the above technical solutions, which will not be elaborated here.

[0056] The technical solution of the fourth aspect of the present invention provides a vehicle, including: a vehicle body; and a water pump as described in the technical solution of the third aspect, installed in the vehicle body.

[0057] The vehicle provided by the technical solution of the fourth aspect of the present invention includes the water pump as described in any one of the technical solutions of the third aspect, so it has all the beneficial effects of any of the above technical solutions, which will not be elaborated here.

[0058] In any of the above technical solutions, the vehicle is a new energy vehicle.

[0059] Of course, it is not limited to the new energy vehicle field, and it can also be applied to technical fields such as traditional fuel vehicles and hybrid vehicles.

[0060] The additional aspects and advantages of the present invention will become obvious in the following description part, or be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the following description of embodiments in conjunction with the accompanying drawings, wherein:

[0062] Figure 1 is a schematic cross-sectional structure diagram of a rotor core according to some embodiments of the present invention;

[0063] Figure 2 is a schematic cross-sectional structure diagram of a rotor core according to an embodiment of the present invention;

[0064] Figure 3 is a schematic cross-sectional structure diagram of a rotor core according to another embodiment of the present invention;

[0065] Figure 4 is a schematic three-dimensional structure diagram of a rotor according to some embodiments of the present invention;

[0066] Figure 5 is a schematic cross-sectional structure diagram of a rotor according to an embodiment of the present invention;

[0067] Figure 6 is a schematic cross-sectional structure diagram of a rotor according to an embodiment of the present invention;

[0068] Figure 7 is a schematic cross-sectional structure diagram of the rotor core after being assembled with permanent magnets according to some embodiments of the present invention;

[0069] Figure 8 is a schematic cross-sectional structure diagram of a rotor according to an embodiment of the present invention;

[0070] Figure 9 is a schematic cross-sectional structure diagram of a rotor according to an embodiment of the present invention;

[0071] Figure 10 is a schematic cross-sectional structure diagram of a rotor according to an embodiment of the present invention;

[0072] Figure 11 is a schematic cross-sectional structure diagram of a rotor according to an embodiment of the present invention;

[0073] Figure 12 is a schematic cross-sectional structure diagram of the rotor core, the rotating shaft and the permanent magnets after being assembled according to an embodiment of the present invention;

[0074] Figure 13 is a schematic cross-sectional structure diagram of the rotor core, the rotating shaft and the permanent magnets after being assembled according to an embodiment of the present invention;

[0075] Figure 14 is a schematic three-dimensional structure diagram of a gasket according to an embodiment of the present invention;

[0076] Figure 15 It is a schematic three - dimensional structure diagram of the gasket according to an embodiment of the present invention;

[0077] Figure 16 It is a schematic three - dimensional structure diagram of the gasket according to an embodiment of the present invention;

[0078] Figure 17 It is a schematic three - dimensional structure diagram of the gasket according to an embodiment of the present invention;

[0079] Figure 18 It is a schematic three - dimensional structure diagram of the gasket according to an embodiment of the present invention;

[0080] Figure 19 It is a schematic three - dimensional structure diagram of the gasket according to an embodiment of the present invention;

[0081] Figure 20 It is a schematic partial structure diagram of the gasket according to an embodiment of the present invention;

[0082] Figure 21 It is a schematic diagram of the magnetization of the rotor according to an embodiment of the present invention;

[0083] Figure 22 It is a schematic diagram of the magnetization of the rotor according to an embodiment of the present invention;

[0084] Figure 23 It is a schematic diagram of the magnetization of the rotor according to an embodiment of the present invention;

[0085] Figure 24 It is a schematic diagram of the magnetization of the rotor according to an embodiment of the present invention;

[0086] Figure 25 It is a schematic block diagram of the motor according to some embodiments of the present invention;

[0087] Figure 26 It is a schematic block diagram of the water pump according to some embodiments of the present invention;

[0088] Figure 27 It is a schematic block diagram of the vehicle according to some embodiments of the present invention.

[0089] Among them, Figures 1 to 27 The corresponding relationship between the reference numerals in

[0090] 100 Rotor, 1 rotating shaft, 11 inner hole of the shaft, 2 rotor core, 21 filling groove, 22 clearance groove, 23 inner side surface, 24 shaft hole, 25 mounting groove, 3 gasket, 31 side peripheral surface, 311 annular groove, 32 convex part, 33 concave part, 34 positioning part, 35 indication marking part, 30 positioning structure, 4 housing, 41 filling part, 42 clearance part, 43 first end layer, 431 first end part, 4311 protruding part, 4312 supporting part, 432 second end part, 44 second end layer, 441 third end part, 442 fourth end part, 45 extension part, 46 plastic coating body, 5 permanent magnet, 6 magnetizing device;

[0091] 200 Motor, 202 stator;

[0092] 300 Water pump, 302 impeller;

[0093] 400 Vehicle, 402 vehicle body. Detailed implementation manners

[0094] In order to more clearly understand the above objects, features and advantages of the present invention, the present invention will be further described in detail below with reference to the drawings and specific implementation manners. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

[0095] In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited by the specific embodiments disclosed below.

[0096] The following refers to Figures 1 to 27 Describe the rotor, motor, water pump and vehicle according to some embodiments of the present invention.

[0097] Embodiment 1

[0098] A rotor 100 (as Figure 4 shown) includes: a rotating shaft 1, a rotor core 2, and a plastic coating body 46.

[0099] Specifically, a shaft hole 24 and a mounting groove 25 are provided in the rotor core 2. The permanent magnet 5 is installed in the mounting groove 25. The plastic coating body 46 is connected to the rotor core 2 and covers at least the open end of the mounting groove 25 to encapsulate the permanent magnet 5 in the rotor core 2.

[0100] Wherein, at least one end of the plastic coating body 46 is provided with an axially extending portion, and the radially inner end of the axially extending portion is flush with the inner side surface 23 of the rotor core 2. The axially extending portion can be the following filling portion 41, extension portion 45, or a combination of the filling portion 41 and the extension portion 45 or other ways.

[0101] By providing an axially extending portion 45 at at least one end of the plastic-coated body 46, and making the radially inner end of the axially extending portion flush with the inner side surface 23 of the rotor core 2, the axial distance between the rotor core 2 and the external gas or liquid can be increased. Furthermore, it can effectively prevent the external gas or liquid from contacting the rotor core 2 or even entering the interior of the rotor core 2 through the gap between the plastic-coated body 46 and the rotating shaft 1, thereby preventing the corrosion of the rotor core 2 and playing an anti-rust role. At the same time, it can also prevent the contamination of the liquid.

[0102] Moreover, the axially extending portion will be tightly combined with the rotating shaft 1, increasing the contact area between the plastic-coated body 46 and the rotating shaft 1, improving the bonding strength between the plastic-coated body 46 and the rotating shaft 1, extending the axial mating length between the plastic-coated body 46 and the rotating shaft 1, and the axially extending portion is also connected to the end layer of the plastic-coated body 46, increasing the strength of the plastic-coated body 46.

[0103] Among them, the rotating shaft 1 can be a hollow shaft with a shaft inner hole 11 provided therein.

[0104] Specifically, at least one end face of the rotor core 2 is provided with a filling groove 21 (as shown in Figure 1 and Figure 7 ), and the filling groove 21 communicates with the shaft hole 24 (as shown in Figure 1 and Figure 7 ).

[0105] Among them, the axially extending portion includes a filling portion 41, and the filling portion 41 is filled in the filling groove 21 of the rotor core 2.

[0106] In this technical solution, at least one end face of the rotor core 2 is provided with a filling groove 21. Since the filling groove 21 communicates with the shaft hole 24, during injection molding, the liquid plastic will flow into the filling groove 21 and finally solidify to form the filling portion 41. The filling portion 41 will be tightly combined with the rotating shaft 1, increasing the contact area between the plastic-coated body 46 and the rotating shaft 1, improving the bonding strength between the plastic-coated body 46 and the rotating shaft 1, extending the axial mating length between the plastic-coated body 46 and the rotating shaft 1, thereby increasing the axial distance between the rotor core 2 and the external gas or liquid, and effectively preventing the external gas or liquid from contacting the rotor core 2 or even entering the interior of the rotor core 2 through the plastic-coated body 46, thus preventing the corrosion of the rotor core 2 and playing an anti-rust role. At the same time, it can also prevent the contamination of the liquid. Moreover, the filling portion 41 is connected to the end layer of the plastic-coated body 46, increasing the strength of the plastic-coated body 46.

[0107] Among them, the filling portion 41 is equivalent to the plastic-coated body 46 adopting an inwardly concave form, extending the axial distance between the rotor core 2 and the external liquid or gas.

[0108] Specifically, the filling groove 21 surrounds the shaft hole 24, and the outer contour of the filling groove 21 is circular, polygonal or petal-shaped.

[0109] The filling groove 21 surrounds the shaft hole 24, so that the filling part 41 in the filling groove 21 also surrounds the rotating shaft 1 and is tightly combined with the rotating shaft 1, which is beneficial to further prevent external gas or liquid from contacting the rotor core 2 through the plastic-coated body 46 and even entering the inside of the rotor core 2, improving the use reliability of the product and the bonding strength between the filling part 41 and the rotating shaft 1.

[0110] As for the specific shape of the outer contour of the filling groove 21, there is no limitation, including but not limited to circular, polygonal or petal-shaped, and can also be serrated or other irregular shapes.

[0111] Furthermore, the ratio of the axial depth H of the filling groove 21 to the axial length L of the rotor core 2 is in the range of 0.03 to 0.3.

[0112] Limiting the ratio of the axial depth of the filling groove 21 to the axial length of the rotor core 2 within the range of 0.03 to 0.3, such as 0.03, 0.05, 0.1, 0.15, 0.2, 0.25, 0.3, etc., can avoid the too weak effect of the filling part 41 due to too small axial depth and the reduction of the strength of the rotor core 2 due to too large axial depth.

[0113] Of course, the ratio of the axial depth H of the filling groove 21 to the axial length L of the rotor core 2 is not limited to the above range and can be adjusted according to needs during actual production.

[0114] Specifically, the axial depth H of the filling groove 21 is in the range of 2 mm to 10 mm.

[0115] Limiting the axial depth of the filling groove 21 within the range of 2 mm to 10 mm, such as 2 mm, 4 mm, 6 mm, 8 mm, 10 mm, etc., can avoid the too weak effect of the filling part 41 due to too small axial depth and the reduction of the strength of the rotor core 2 due to too large axial depth.

[0116] Of course, the axial depth of the filling groove 21 is not limited to the above range and can be adjusted according to needs during actual production.

[0117] Among them, the outer contour of the filling groove 21 has a circumscribed circle, and the ratio of the diameter W of the circumscribed circle to the diameter d of the outer contour of the rotor core 2 is in the range of 0.24 to 0.57.

[0118] Limiting the ratio of the diameter of the circumscribed circle of the filling groove 21 to the diameter of the outer contour of the rotor core 2 within the range of 0.24 to 0.57, such as 0.24, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.57, etc., can avoid the too weak effect of the filling part 41 due to too small radial width and the reduction of the strength of the rotor core 2 due to too large radial width.

[0119] Of course, the ratio of the diameter W of the circumscribed circle to the diameter d of the outer contour of the rotor core 2 is not limited to the above range and can be adjusted according to needs during actual production.

[0120] Embodiment 2

[0121] On the basis of Embodiment 1, further, at least one clearance groove 22 is provided on the inner side surface 23 of the rotor core 2, as Figure 2 and Figure 3 shown. The clearance groove 22 axially penetrates at least one end surface of the rotor core 2 along the axis of the rotor.

[0122] In the prior art, when the rotating shaft 1 is in interference fit with the shaft hole 24, there is a problem that the pressing force is too large when the rotating shaft 1 is inserted into the rotor core 2, which easily causes the rotating shaft 1 to be bent. In this application, the clearance groove 22 is provided on the inner side surface 23 of the rotor core 2, which can reduce the contact area between the rotor core 2 and the rotating shaft 1, thereby reducing the frictional force between the rotating shaft 1 and the rotor core 2 during assembly, that is, reducing the frictional force received when the rotating shaft 1 is pressed in, which is beneficial to assembly and further prevents the rotating shaft 1 from being bent. By controlling the number and size of the clearance grooves 22, the mating area between the rotating shaft 1 and the inner hole of the rotor core 2 can be determined, which is convenient for calculating the pressing force and beneficial to assembly.

[0123] Further, the clearance groove 22 axially penetrates at least one end surface of the rotor core 2 along the axis of the rotor.

[0124] This is beneficial to extending the axial length of the clearance groove 22, and further reducing the contact area between the rotating shaft 1 and the rotor core 2 during assembly, and further reducing the assembly difficulty.

[0125] In addition, for the scheme where the outer shell 4 adopts a plastic-coated body 46, by providing the clearance groove 22 on the inner side surface 23 of the rotor core 2, since the clearance groove 22 axially penetrates at least one end surface of the rotor core 2 along the axis of the rotor, when injection molding, the liquid plastic will flow into the clearance groove 22 and finally solidify to form a clearance portion 42, which is tightly combined with the rotating shaft 1. This increases the contact area between the plastic-coated body 46 and the rotating shaft 1, improves the bonding strength between the plastic-coated body 46 and the rotating shaft 1, can effectively prevent external gas or liquid from contacting the rotor core 2 through the plastic-coated body 46 and even entering the inside of the rotor core 2, thereby preventing the rotor core 2 from being corroded and playing an anti-rust role; at the same time, it can also prevent polluting liquids; and it also increases the strength of the plastic-coated body 46, making the combination of the rotor core 2 and the plastic-coated body 46 more compact. And, the clearance portion 42 can be connected to at least one end layer of the plastic-coated body 46, increasing the strength of the plastic-coated body 46.

[0126] Among them, the number of the clearance grooves 22 can be one or multiple. When there are multiple clearance grooves, they are arranged at intervals along the circumferential direction of the rotor core 2, as Figure 2 , Figure 3 ,Figure 12 and Figure 13 as shown. The cross-sectional shape of the relief groove 22 includes, but is not limited to, a semicircle (such as Figure 2 and Figure 12 shown), a triangle (such as Figure 3 and Figure 13 shown), a square, etc.

[0127] Specifically, the shape of the contour line of the cross-section of the groove wall of the relief groove 22 includes an arc shape (such as Figure 2 and Figure 12 shown), a parabola shape, a V shape (such as Figure 3 and Figure 13 shown), any one or any combination of U shapes.

[0128] The radial opening end size of the relief groove 22 in this solution is relatively large, which is beneficial to further reducing the contact area between the rotating shaft 1 and the rotor core 2 during assembly, and further reducing the assembly difficulty.

[0129] Of course, the shape of the contour line of the cross-section of the groove wall of the relief groove 22 is not limited to the above arc shape (such as a semicircle), parabola shape, V shape or U shape or any combination of the above, and can also be other shapes.

[0130] Furthermore, the number of relief grooves 22 is multiple, such as Figure 2 and Figure 3 shown, and the multiple relief grooves 22 are evenly distributed along the circumferential direction of the rotor core 2.

[0131] Evenly distributing multiple relief grooves 22 along the circumferential direction of the rotor core 2 is beneficial to further reducing the contact area between the rotating shaft 1 and the rotor core 2 during assembly, and further reducing the assembly difficulty; on the other hand, it is beneficial to the balanced force of the rotating shaft 1 and is also beneficial to reducing the assembly difficulty. In addition, for the solution where the relief groove 22 is filled with the plastic coating body 46, it is also beneficial to the balanced force between the rotating shaft 1 and the plastic coating body 46.

[0132] Specifically, the ratio of the remaining arc length A of the inner side surface 23 of the rotor core 2 to the circumference B of the shaft hole 24 is in the range of 0.3 to 0.7, the ratio of the remaining area Sa of the inner side surface 23 of the rotor core 2 to the complete area Sb of the hole wall of the shaft hole 24 is in the range of 0.3 to 0.7, and the ratio of the radial depth C of the relief groove 22 to the diameter D of the shaft hole 24 is in the range of 0.0625 to 0.375.

[0133] Further, the ratio of the remaining arc length A of the inner side surface 23 of the rotor core 2 to the perimeter B of the shaft hole 24 is in the range of 0.4 to 0.5, the ratio of the remaining area Sa of the inner side surface 23 of the rotor core 2 to the complete area Sb of the hole wall of the shaft hole 24 is in the range of 0.4 to 0.5, and the ratio of the radial depth C of the clearance groove 22 to the diameter D of the shaft hole 24 is in the range of 0.2 to 0.3.

[0134] The radial open end of the clearance groove 22 refers to the open end of the clearance groove 22 facing the central axis of the shaft hole 24. The surface where this open end is located is a part of a cylindrical surface, and the cross-section is an arc. The arc length of this cross-section is the arc length of the radial open end of the clearance groove 22. The remaining arc length A of the inner side surface 23 of the rotor core 2 refers to the perimeter of the inner side surface 23 where the clearance groove 22 is not opened (i.e., the perimeter B of the shaft hole) minus the total arc length of all the radial open ends of the clearance grooves 22, that is, the arc length of the part of the inner side surface 23 of the rotor core 2 (where the clearance groove 22 is opened) in contact with the rotating shaft 1. For example: in Figure 2 A = a0 + a1 + a2, where a0 = a1 = a2. Of course, a0, a1, and a2 may not be equal; in Figure 3 A = a × 6. Limiting the ratio of the remaining arc length A of the inner side surface 23 of the rotor core 2 to the perimeter B of the shaft hole 24 within the range of 0.3 to 0.7, such as 0.3, 0.4, 0.5, 0.6, 0.7, etc., and further limiting it within the range of 0.4 to 0.5, such as 0.42, 0.44, 0.46, 0.48, etc., not only avoids the function of the clearance part being too weak due to the clearance groove 22 being too narrow, but also avoids the reduction of the strength of the rotor core 2 due to the clearance groove 22 being too wide.

[0135] The complete area Sb of the hole wall of the shaft hole 24 refers to the total area of the hole wall of the shaft hole 24 where the clearance groove 22 is not opened. The remaining area of the inner side surface of the rotor core 2 refers to the total area of the inner side surface where the clearance groove 22 is not opened (i.e., the complete area Sb of the hole wall of the shaft hole 24) minus the total area of all the radial open ends of the clearance grooves 22, that is, the area of the part of the inner side surface of the rotor core 2 (where the clearance groove 22 is opened) in contact with the rotating shaft 1. Limiting the ratio of the remaining area Sa of the inner side surface of the rotor core 2 to the complete area Sb of the hole wall of the shaft hole 24 within the range of 0.3 to 0.7, such as 0.3, 0.4, 0.5, 0.6, 0.7, etc., and further limiting it within the range of 0.4 to 0.5, such as 0.42, 0.44, 0.46, 0.48, etc., not only avoids the function of the clearance part 42 being too weak due to the clearance groove 22 being too narrow, but also avoids the reduction of the strength of the rotor core 2 due to the clearance groove 22 being too wide.

[0136] The radial depth C of the clearance groove 22 refers to the distance between the midpoint of the cross-section of the radial open end of the clearance groove 22 and the outermost side in the radial direction of the clearance groove 22, such asFigure 2 and Figure 3 As shown. The ratio of the radial depth C of the clearance groove 22 to the diameter D of the shaft hole 24 is limited within the range of 0.0625 to 0.375, such as 0.0625, 0.1, 0.125, 0.175, 0.2, 0.225, 0.275, 0.3, 0.325, 0.375, etc., and further limited within the range of 0.2 to 0.3, such as 0.22, 0.24, 0.26, 0.28, etc., which not only avoids the function of the clearance part being too weak due to the clearance groove 22 being too narrow, but also avoids the reduction of the strength of the rotor core 2 due to the clearance groove 22 being too wide.

[0137] It can be understood that when the clearance groove 22 is not provided on the rotor core 2, the contact area S0 between the rotor core 2 and the rotating shaft 1 = the circumference B of the shaft hole 24 × the axial length L of the rotor core 2 = Sb. When the clearance groove 22 is provided on the rotor core 2, the contact area S1 between the rotor core 2 and the rotating shaft 1 = the remaining arc length of the inner side surface 23 of the rotor core 2 × the axial length L of the rotor core 2 = Sa. When the shapes of multiple clearance grooves 22 are exactly the same, S1 = S0 - the arc length of the radial opening end of the clearance groove 22 × the axial length L of the rotor core 2 × the number of clearance grooves 22 = Sa. By reducing the contact area between the rotating shaft 1 and the rotor core 2, the function of releasing pressure can be achieved, making it easier to press-fit when the rotating shaft 1 and the shaft hole 24 are in interference fit, and at the same time facilitating the flow of liquid plastic into the clearance groove 22 during injection molding.

[0138] Of course, the ratio of the arc length A of the radial opening end of the clearance groove 22 to the circumference B of the shaft hole 24 is not limited to the above range, and can be adjusted according to needs during the actual production process. Similarly, the ratio of the radial depth C of the clearance groove 22 to the diameter D of the shaft hole 24 is not limited to the above range, and can be adjusted according to needs during the actual production process. Similarly, the ratio of the remaining area Sa of the inner side surface of the rotor core 2 to the complete area Sb of the hole wall of the shaft hole 24 is not limited to the above range, and can be adjusted according to needs during the actual production process.

[0139] Furthermore, the shaft hole 24 is used for interference fit with the rotating shaft 1.

[0140] The shaft hole 24 is used for interference fit with the rotating shaft 1. During the assembly process of the rotating shaft 1 and the rotor core 2, the frictional resistance received by the rotating shaft 1 is relatively large. Therefore, adopting the design method of the present application is beneficial to significantly reducing the assembly difficulty of the rotating shaft 1. Of course, the shaft hole 24 can also be used for clearance fit or transition fit with the rotating shaft 1.

[0141] Furthermore, a chamfer is provided at the connecting part between the radial opening end of the clearance groove 22 and the inner side surface of the rotor core 2.

[0142] A chamfer is provided at the connection part between the radial opening end of the clearance groove 22 and the inner side surface of the rotor core 2, making the connection part between the two relatively smooth, facilitating the smooth inflow of the liquid plastic into the clearance groove 22 during the injection molding process; it is also beneficial to increase the groove wall area of the clearance groove 22 (the chamfered part is regarded as a part of the clearance groove 22), thereby improving the bonding strength between the plastic-coated body and the rotor core 2; at the same time, it is also beneficial to increase the arc length of the radial opening end of the clearance groove 22, thereby further reducing the contact area between the rotor core 2 and the rotating shaft 1 and further reducing the assembly difficulty of the rotating shaft 1.

[0143] Embodiment Three

[0144] The difference from Embodiment One or Embodiment Two is that: the axial extension part includes an extension part 45, as Figure 10 shown. The extension part 45 is provided on the end surface of the plastic-coated body 46 and extends along the axial direction of the rotor away from the rotor core 2.

[0145] Embodiment Four

[0146] On the basis of Embodiment One or Embodiment Two, further, the axial extension part includes an extension part 45, as Figure 10 shown. The extension part 45 is provided on the end surface of the plastic-coated body 46 and extends along the axial direction of the rotor away from the rotor core 2.

[0147] In Embodiment Three and Embodiment Four, an extension part 45 is provided on the end surface of the plastic-coated body 46. Since the extension part 45 extends along the axial direction of the rotor and away from the rotor core 2, it can also increase the axial distance between the rotor core 2 and the external gas or liquid, and can also extend the axial mating length between the plastic-coated body 46 and the rotating shaft, which is beneficial to preventing the external gas or liquid from contacting the rotor core 2 or even entering the inside of the rotor core 2 through the plastic-coated body 46, improving the use reliability of the product, and improving the bonding strength between the plastic-coated body 46 and the rotating shaft. Among them, the extension part 45 is equivalent to the plastic-coated body 46 adopting an outward convex form to extend the axial distance between the rotor core 2 and the external liquid or gas.

[0148] Embodiment Five

[0149] On the basis of any of the above embodiments, further, the rotor 100 further includes: a gasket 3. The gasket 3 is provided with a positioning structure 30 for directly or indirectly positioning the position of the permanent magnet 5, and the gasket 3 is fixed on the plastic-coated body 46 and is coaxially arranged with the rotor core 2.

[0150] The gasket 3 is provided with a positioning structure 30, which can directly or indirectly position the permanent magnet 5 in the rotor core 2. Then, according to the position of the permanent magnet 5, the magnetization position of the permanent magnet 5 can be accurately positioned, thereby improving the accuracy of the subsequent magnetization and ensuring that the permanent magnet 5 is fully magnetized.

[0151] In addition, compared with arranging the positioning structure 30 on the plastic-coated body 46, the size of the positioning structure 30 on the gasket 3 can be significantly reduced, or the outer contour of the gasket 3 (such as the outer contour of the polygonal gasket 3) can be directly used as the positioning structure 30, thereby simplifying the design of the positioning structure 30 and avoiding the additional arrangement of the positioning structure 30 on the plastic-coated body 46, thus simplifying the structure of the plastic-coated body 46 and the processing technology of the plastic-coated body 46.

[0152] Specifically, the positioning structure 30 can be completely exposed outside the plastic-coated body 46, or only partially exposed outside the plastic-coated body 46. For example: the positioning structure 30 is the side peripheral surface 31 of the gasket 3, and the contour of the side peripheral surface 31 is polygonal. Then, a part of the side peripheral surface 31 of the gasket 3 can be covered by the plastic-coated body 46, and a part can protrude from the plastic-coated body 46, thereby playing a positioning role. At this time, the positioning structure 30 is partially exposed outside the plastic-coated body 46.

[0153] Or, the positioning structure 30 is a protrusion on the end surface of the gasket 3 facing away from the rotor core 2, and the protrusion is completely exposed outside the plastic-coated body 46. At this time, the positioning structure 30 is completely exposed outside the plastic-coated body 46.

[0154] Among them, the permanent magnet 5 also refers to a magnetic steel, and a permanent magnet based on a permanent magnetic material is particularly preferred, such as the iron-nickel-cobalt permanent magnet 5. The permanent magnet 5 can be installed into the rotor core 2 by means of glue coating or thimble support.

[0155] Specifically, the plastic-coated body covers the part of the rotor core 2 exposed outside the shaft hole 24 and outside the gasket 3, and covers a part of the gasket 3 exposed outside the shaft hole 24, and forms an integral structure with the rotor core 2 and the gasket 3.

[0156] Since the plastic-coated body 46 wraps the part of the rotor core 2 exposed outside the shaft hole 24 and outside the gasket 3 (that is, the part of the rotor core 2 that does not contact the rotating shaft 1 and the gasket 3) and covers a part of the gasket 3 exposed outside the shaft hole 24, it is ensured that the rotor core 2 can be stably and reliably sealed inside the plastic-coated body 46 or inside the housing 4 jointly formed by the plastic-coated body 46 and the gasket 3, and no displacement or even ejection will occur. It is also ensured that the gasket 3 will not be displaced or ejected, etc., improving the use reliability of the motor 200. At the same time, it also eliminates the cumbersome processes such as fixing with fasteners, which is beneficial to simplifying the processing process and improving the preparation efficiency.

[0157] Among them, the rotating shaft 1 can be injection-molded together with the plastic-coated body 46, or it can be not injection-molded together with the plastic-coated body 46. For the solution where the rotating shaft 1 is injection-molded with the plastic-coated body 46, first, the rotor core 2 and the gasket 3 are sleeved on the rotating shaft 1, and the gasket 3 is installed in the installation groove 25 with a certain relative positional relationship. Then, the permanent magnet is placed, and then liquid plastic is injected into the mold for injection molding. After the liquid plastic solidifies into the plastic-coated body 46, an integrally formed rotor sealed by injection molding can be obtained. The rotating shaft 1, the rotor core 2, the gasket 3, and the plastic-coated body 46 form an integral structure with high bonding strength.

[0158] Meanwhile, during the injection molding process, the liquid plastic can enter the filling groove 21 and the clearance groove 22, and then solidify to form the filling part 41 and the clearance part 42, eliminating the need to additionally set up the filling part 41 and perform the filling process, improving the assembly efficiency and also enhancing the bonding strength between the plastic-coated body 46 and the rotating shaft 1.

[0159] Specifically, the plastic-coated body 46 includes a first end layer 43 and a second end layer 44, as Figure 5 shown. The first end layer 43 covers one end face of the rotor core 2 and wraps a part of the gasket 3, and the second end layer 44 covers the other end face of the rotor core 2, as Figure 5 shown.

[0160] More specifically, the first end layer 43 includes a first end part 431 and a second end part 432, and the second end layer 44 includes a third end part 441 and a fourth end part 442, as Figure 5 shown. The first end part 431 and the second end part 432 are connected in sequence from the inside to the outside along the radial direction of the rotor 100, and the first end part 431 wraps a part of the gasket 3 and a part of the first end part 431 corresponds to the end face of the permanent magnet 5. The third end part 441 and the fourth end part 442 are connected in sequence from the outside to the inside along the radial direction of the rotor 100. That is to say, the diameter of the outer contour of the first end part 431 is smaller than the diameter D3 of the outer contour of the second end part 432, and the diameter D4 of the outer contour of the third end part 441 is larger than the diameter D5 of the outer contour of the fourth end part 442, as Figure 6 shown.

[0161] Among them, the thickness of the first end part 431 is greater than the thickness T3 of the second end part 432, and the thickness T4 of the third end part 441 is smaller than the thickness T5 of the fourth end part 442, as Figure 6 shown.

[0162] Since the external gas or liquid penetrates inward along the gap between the plastic-coated body 46 and the rotating shaft 1, and then contacts the rotor core 2 or enters the inside of the rotor core 2, the part of the end face of the rotor core 2 closer to the inside in the radial direction is more likely to be corroded.

[0163] Therefore, in this solution, the two end layers of the plastic-coated body 46 are designed to have a non-uniform thickness structure. The first end portion 431 and the fourth end portion 442 closer to the inside in the radial direction are relatively thick, while the second end portion 432 and the third end portion 441 closer to the outside in the radial direction are relatively thin. This is equivalent to locally thickening the radial interior of the two end layers, which increases the distance between the part of the end face of the rotor core 2 closer to the inside in the radial direction and the external gas or liquid, facilitating the prevention of the external gas or liquid from entering the rotor core 2 and corroding the rotor core 2.

[0164] At the same time, compared with thickening the two end layers as a whole, raw materials are saved, production costs are reduced, and the product weight is also reduced. In addition, a part of the first end portion 431 corresponds to the end face of the permanent magnet 5, which is conducive to supporting the permanent magnet 5 during injection molding and improving the stability of the position of the permanent magnet 5.

[0165] Furthermore, the first end portion 431 includes a protruding portion 4311 and a supporting portion 4312, as Figure 5 , Figure 6 , Figure 8 and Figure 9 shown. The protruding portion 4311 and the supporting portion 4312 are connected in sequence from the inside to the outside along the radial direction of the rotor 100. That is to say, the diameter D0 of the outer contour of the gasket 3 is smaller than the diameter D1 of the outer contour of the protruding portion 4311, and the diameter D1 of the outer contour of the protruding portion 4311 is smaller than the diameter D2 of the outer contour of the supporting portion 4312. And, as Figure 5 and Figure 6 shown, a part of the gasket 3 is embedded in the protruding portion 4311 and is covered by the protruding portion 4311, and the supporting portion 4312 corresponds to the end face of the permanent magnet 5. The thickness T1 of the protruding portion 4311 is greater than the thickness T2 of the supporting portion 4312.

[0166] The first end portion 431 is designed to have a non-uniform thickness structure. The protruding portion 4311 closer to the inside in the radial direction is relatively thick, and the supporting portion 4312 closer to the outside in the radial direction is relatively thin. A part of the gasket 3 is embedded in the protruding portion 4311 and is covered by the protruding portion 4311, which further increases the distance between the part of the end face of the rotor core 2 closer to the inside in the radial direction and the external gas or liquid, facilitating the further prevention of the external gas or liquid from entering the rotor core 2 and corroding the rotor core 2. And the position of the supporting portion 4312 corresponds to the end face of the permanent magnet 5, which is conducive to supporting the permanent magnet 5 during injection molding and improving the stability of the position of the permanent magnet 5.

[0167] It can be understood that the part of the first end portion 431 protruding from the second end portion 432 can protrude in the direction towards the rotor core 2, and in this case, the filling portion 41 can form a part of the first end portion 431; or it can protrude in the direction away from the rotor core 2, and in this case, the extending portion 45 can form a part of the first end portion 431. Similarly, the filling portion 41 can form a part of the fourth end portion 442, and the extending portion 45 can also form a part of the fourth end portion 442. That is to say, the first end portion 431 and the fourth end portion 442 can be concave, convex, or both concave and convex at the same time, so as to increase their thickness.

[0168] Furthermore, the end face of the gasket 3 facing away from the rotor core 2 protrudes from the plastic-coated body 46, as Figure 6 shown.

[0169] Making the end face of the gasket 3 facing away from the rotor core 2 protrude from the plastic-coated body 46 is beneficial in two aspects. On the one hand, it is conducive to increasing the layout range of the positioning structure 30, facilitating the reasonable design of the shape, position, quantity, etc. of the positioning structure 30 according to needs, so as to improve the positioning effect; on the other hand, it is also beneficial to reducing the consumption of plastic, thereby saving raw materials.

[0170] At the same time, the partial exposure of the gasket 3 outside the plastic-coated body 46 is also conducive to further increasing the axial distance between the rotor core 2 and the external gas or liquid, thereby further improving the rust prevention effect. As Figure 5 and Figure 6 shown, the axial distance between the left end of the rotor core 2 and the external gas or liquid increases from T3 to L1, and the axial distance between the right end of the rotor core 2 and the external gas or liquid increases from T4 to L2.

[0171] In addition, it can also prevent the plastic-coated body 46 from rubbing and wearing against other structures, playing a protective role for the plastic-coated body 46. Of course, the end face of the gasket 3 facing away from the rotor core 2 can also be flush with the end face of the plastic-coated body 46.

[0172] Among them, the axial height H1 of the end face of the gasket 3 facing away from the rotor core 2 protruding from the plastic-coated body 46 is less than or equal to 5 mm, such as 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, etc. That is to say, if the thickness of the gasket 3 is denoted as H2, the depth of the gasket 3 embedded in the protruding portion 4311 is less than H2, and the distance between the end face of the gasket 3 facing away from the rotor core 2 and the end face of the protruding portion 4311 facing away from the rotor core 2 is H2.

[0173] The axial height H1 of the end face of the spacer 3 facing away from the rotor core 2 protruding from the plastic - coated body 46 is limited to be less than or equal to 5 mm. This not only avoids the situation where the exposed area of the spacer 3 is too small due to too small H1, but also avoids the situation where the bonding force between the spacer 3 and the plastic - coated body 46 is too weak due to too large H1, thereby improving the bonding strength between the spacer 3 and the plastic - coated body 46. Of course, the height of the end face of the spacer 3 facing away from the rotor core 2 protruding from the plastic - coated body 46 is not limited to the above range and can be adjusted according to needs during actual production.

[0174] Specifically, the shape of the outer contour of the spacer 3 is circular (as shown in Figure 17 , Figure 18 and Figure 20 ) or polygonal (as shown in Figure 14 , Figure 15 , Figure 16 and Figure 18 ).

[0175] The shape of the outer contour of the spacer 3 is not specifically limited, including but not limited to circular or polygonal (such as triangle, quadrilateral, pentagon, hexagon, octagon, etc.). Of course, it can also be other special - shaped shapes, such as petal - shaped, star - shaped, and can be specifically designed according to the specific structure of the product. Among them, for the polygon (the adjacent two sides can be connected by a fillet or chamfer, or directly connected by a sharp angle) or other non - circular special - shaped shapes, it can limit the circumferential relative rotation between the spacer 3 and the plastic - coated body 46, thereby improving the connection reliability between the spacer 3 and the plastic - coated body 46. At the same time, it is also convenient to use the shape of the outer contour to position the permanent magnet 5.

[0176] Furthermore, the spacer 3 is provided with a recess 33 (as shown in Figure 17 ) and / or a protrusion 32, as shown in Figure 16 and Figure 19 .

[0177] Setting the recess 33, the protrusion 32, or both the recess 33 and the protrusion 32 on the spacer 3 can play a good positioning role. Specifically, when these structures are provided at the part where the spacer 3 contacts the plastic - coated body 46, these structures can increase the contact area between the plastic - coated body 46 and the spacer 3, thereby increasing the bonding force between the plastic - coated body 46 and the spacer 3, making the spacer 3 more firm and not easy to loosen. And when these structures are not completely covered by the plastic - coated body 46, they can also be used to position the permanent magnet 5. When these structures are provided at the part where the spacer 3 does not contact the plastic - coated body 46, these structures can be used to position the permanent magnet 5. In addition, these recesses 33 and protrusions 32 can also be used to store liquid, play a lubricating role, and reduce the contact area between the spacer 3 and other external structures, thereby improving frictional heat generation.

[0178] Among them, the protrusion 32 can be a relatively small - sized protrusion, such asFigure 16 as shown; it can also be a relatively large convex plate, such as Figure 19 shown.

[0179] In some specific examples, the positioning structure 30 includes the outer contour of the spacer 3, such as Figure 21 and Figure 22 shown.

[0180] The shape of the outer contour of the spacer 3 is reasonably designed according to the position of the permanent magnet 5. When assembling the spacer 3, a corresponding relationship is generated between its outer contour and the position of the groove of the permanent magnet 5. After the plastic coating is completed, the position of the permanent magnet 5 can be located according to the outer contour of the spacer 3. The structure and principle are relatively simple and easy to implement.

[0181] In a specific example, the shape of the outer contour of the spacer 3 is a polygon, such as Figure 15 shown. A plurality of recesses 33 are provided on at least one end surface of the spacer 3, and the number of the recesses 33 on at least one end surface is equal to the number of sides of the polygon and the plurality of recesses 33 are evenly distributed along the circumferential direction of the spacer 3.

[0182] The shape of the outer contour of the spacer 3 is a polygon, which can be a strictly defined polygon, that is, two adjacent sides are directly connected by a sharp angle; it can also not be a strictly defined polygon, for example, two adjacent sides are connected by a rounded corner or a chamfer. In this way, the position of the permanent magnet 5 can be directly located by using the contour of the spacer 3, effectively simplifying the product structure. A plurality of recesses 33 equal to the number of sides of the polygon are evenly provided along the circumferential direction on at least one end surface of the spacer 3, making the structure of the spacer 3 more regular and facilitating processing and forming. Among them, when the above-mentioned recesses 33 are provided on the end surface of the spacer 3 facing the rotor core 2, these recesses 33 can increase the contact area between the spacer 3 and the plastic-coated body, thereby improving the bonding strength between the spacer 3 and the plastic-coated body. When the above-mentioned recesses 33 are provided on the end surface of the spacer 3 facing away from the rotor core 2, these recesses 33 can be used to locate the position of the permanent magnet 5 and can also be used to accommodate liquid to improve heat generation due to friction.

[0183] For example: in Figure 21 and Figure 22 , the spacer 3 is square and the number of permanent magnets 5 is four. The outer contour of the spacer 3 is directly used as the positioning structure to locate the position of the permanent magnet. That is to say, there is no need to set an additional positioning part 34, and the shape of the spacer 3 itself can be used for positioning. Compared with the scheme of additionally setting a positioning part 34 on the spacer 3 or additionally setting a positioning part 34 on the plastic-coated body 46, this scheme significantly simplifies the production process and saves raw materials.

[0184] In some specific examples, the positioning structure 30 includes recesses 33 and / or protrusions 32 provided on the spacer 3.

[0185] The recesses 33, protrusions 32, or the number, shape, and position of the recesses 33 and protrusions 32 are reasonably arranged according to the position of the permanent magnet 5. When assembling the gasket 3, a corresponding relationship is generated between these structures and the position of the permanent magnet 5 groove. After the plastic coating is completed, the position of the permanent magnet 5 can be located according to the outer contour of the gasket 3. The structure and principle are relatively simple and easy to implement.

[0186] Furthermore, the positioning structure 30 includes a plurality of positioning portions 34. The number of the positioning portions 34 is equal to the number of the permanent magnets 5, and the plurality of positioning portions 34 directly correspond to the plurality of permanent magnets 5 one by one, and are used to directly position the positions of the plurality of permanent magnets 5, as Figure 21 shown. In Figure 21 , the number of the permanent magnets 5 is 4, the positioning structure 30 includes four positioning portions 34, and the four positioning portions 34 are respectively four corner portions of the outer contour of the square gasket 3.

[0187] The positioning structure 30 includes a positioning portion 34. Using the positioning portion 34 to position the position of the permanent magnet 5 is beneficial to improving the positioning speed of the position of the permanent magnet 5, and further beneficial to improving the magnetization efficiency. Among them, the number of the positioning portions 34 may be equal to the number of the permanent magnets 5, or may not be equal to the number of the permanent magnets 5, and can be used to directly position the position of the permanent magnet 5, or can be used to indirectly position the position of the permanent magnet 5.

[0188] Of course, for the case where the number of the permanent magnets 5 is one, the position of the permanent magnet 5 can be directly positioned by using one positioning portion 34.

[0189] Specifically, the number of the positioning portions 34 is equal to the number of the permanent magnets 5, and the plurality of positioning portions 34 directly correspond to the plurality of permanent magnets 5 one by one. This solution positions the position of each permanent magnet 5 one by one through the plurality of positioning portions 34, realizes the direct positioning of the position of each permanent magnet 5, ensures the positioning accuracy of the position of each permanent magnet 5, and when magnetizing, magnetize each permanent magnet 5 according to each positioning portion 34, without the need for calculation for indirect positioning. On the basis of ensuring the magnetization accuracy, it is beneficial to further improve the magnetization rate.

[0190] Furthermore, the projection of the permanent magnet 5 on the end face of the rotor 100 is a strip structure, as Figures 21 to 24 shown. Among them, the number of the permanent magnets 5 is multiple, and the multiple permanent magnets 5 are evenly distributed along the circumferential direction of the rotating shaft 1. The connection line between the center of the strip structure and the center of the end face of the rotor 100 passes through the positioning portion 34, as Figure 21 shown.

[0191] Permanent magnet motors 200 are generally divided into radial structure permanent magnet motors 200 and tangential structure permanent magnet motors 200. The projection of the permanent magnet 5 on the end face of the radial structure permanent magnet motor 200 is generally a strip structure extending along the circumferential direction of the rotor core 2 (asFigure 21 As shown in the figure, the projection of the permanent magnet 5 of the tangential structure permanent magnet motor 200 on the end face of the rotor 100 is generally a strip structure extending along the radial direction of the rotor core 2 (such as Figure 22 shown). The connection line between the center of the strip structure and the center of the end face of the rotor 100 passes through the positioning portion 34. Then, the connection line between the positioning portion 34 and the center of the end face of the rotor 100 must pass through the center position of the permanent magnet 5. Then, the magnetic charging head of the magnetic charging device 6 faces the positioning portion 34, as Figure 21 shown, and also faces the center position of the permanent magnet 5, and can accurately magnetize the permanent magnet 5.

[0192] Embodiment Six

[0193] The difference from Embodiment Five is that: an annular groove 311 is provided on the side peripheral surface 31 of the gasket 3, as Figure 20 shown. A part of the first end portion 431 is embedded in the annular groove 311 to cover a part of the gasket 3, as Figure 11 shown.

[0194] An annular groove 311 is provided on the side peripheral surface 31 of the gasket 3, then the longitudinal section of the gasket 3 is in an I shape. Since the gasket 3 is sleeved on the rotating shaft 1 and the opening of the annular groove 311 faces radially outward, the annular groove 311 is exposed outside the rotating shaft 1 and does not contact the rotating shaft 1. A part of the first end portion 431 is embedded in the annular groove 311, then the first end portion 431 covers the groove wall of the annular groove 311 and is tightly combined with the groove wall of the annular groove 311 to form an integral body, and the bonding force is relatively high, the fixing is relatively firm, and the relative axial movement between the gasket 3 and the plastic-coated body 46 can be effectively prevented.

[0195] In addition, the gasket 3 of this shape is relatively thick. On the basis of ensuring that the distance between the radially inner part of the end face of the rotor core 2 and the external gas or liquid is relatively large, the thickness of the corresponding position of the first end portion 431 can be reduced. For example, the first end portion 431 can be directly designed to have an equal thickness structure, as Figure 11 shown, which is thus beneficial to saving raw materials.

[0196] Embodiment Seven

[0197] The difference from Embodiment Five is that: the positioning structure 30 includes a plurality of positioning portions 34, the number of the positioning portions 34 is equal to the number of the permanent magnets 5, and the plurality of positioning portions 34 cooperate to indirectly position the positions of the plurality of permanent magnets 5, as Figure 22 shown. In Figure 22 , the number of the permanent magnets 5 is 4, the positioning structure 30 includes four positioning portions 34, and the four positioning portions 34 are respectively the four corner portions of the outer contour of the square gasket 3.

[0198] The number of the positioning parts 34 is equal to the number of the permanent magnets 5, and the multiple positioning parts 34 cooperate to indirectly position the positions of the multiple permanent magnets 5. For example, when the multiple permanent magnets 5 are evenly distributed, the multiple positioning parts 34 are respectively located between two adjacent permanent magnets 5, and there is a permanent magnet 5 between two adjacent positioning parts 34, thus realizing the positioning of the position of each permanent magnet 5 as well.

[0199] Further, the projection of the permanent magnet 5 on the end face of the rotor 100 is a strip structure. Among them, the number of the permanent magnets 5 is multiple, and the multiple permanent magnets 5 are evenly distributed along the circumferential direction of the rotating shaft 1. The positioning part 34 is located at the central position between two adjacent strip structures, as Figure 22 shown.

[0200] The permanent magnet motor 200 is generally divided into a radial structure permanent magnet motor 200 and a tangential structure permanent magnet motor 200. The projection of the permanent magnet 5 of the radial structure permanent magnet motor 200 on the end face of the rotor 100 is generally a strip structure extending along the circumferential direction of the rotor core 2, and the projection of the permanent magnet 5 of the tangential structure permanent magnet motor 200 on the end face of the rotor 100 is generally a strip structure extending along the radial direction of the rotor core 2. Among them, when the multiple permanent magnets 5 are evenly distributed along the circumferential direction of the rotating shaft 1, the positioning part 34 can be located at the central position between two adjacent strip structures, and the middle position between two positioning parts 34 is a permanent magnet 5. Or according to the cooperation between the positioning part 34 and the indication marking part 35, rotating a suitable angle along the position where the positioning part 34 is located can locate the position of one of the adjacent permanent magnets 5, and then infer the positions of the other permanent magnets 5.

[0201] Among them, for the radial structure permanent magnet motor 200, it is preferred to set the positioning part 34 on the connection line between the center of the strip structure and the center of the end face of the rotor 100; for the tangential structure permanent magnet motor 200, it is preferred to set the positioning part 34 at the central position between two adjacent strip structures.

[0202] Embodiment Eight

[0203] The difference from Embodiment Five is that: the positioning structure 30 includes a positioning part 34 and an indication marking part 35. The positioning part 34 positions the position of at least one permanent magnet 5, and the indication marking part 35 is used to cooperate with the positioning part 34 to infer the positions of the other permanent magnets 5.

[0204] This solution realizes the direct positioning of the position of at least one permanent magnet 5 through the positioning part 34, and realizes the indirect positioning of the positions of the other permanent magnets 5 through the cooperation between the position of this permanent magnet 5 (obtained by the positioning of the positioning part 34) and the indication marking part 35. Compared with the solution of setting multiple positioning parts 34 corresponding to the permanent magnets 5 one by one, it is beneficial to simplify the positioning structure 30 and simplify the production process.

[0205] Among them, the number of the positioning parts 34 and the specific number of the indication and identification parts 35 are not limited, and the number of the positioning parts 34 and the number of the indication and identification parts 35 may be equal or may not be equal.

[0206] For example: the number of the positioning parts 34 is one, and the number of the indication and identification parts 35 is one, as Figure 23 shown, which is beneficial to further simplify the positioning structure 30 and further simplify the production process. Or, the number of the positioning parts 34 is two, and the number of the indication and identification parts 35 is two, which is beneficial to further improve the positioning speed and further improve the magnetization rate. Or, the number of the positioning parts 34 is two, and the number of the indication and identification parts 35 is one, as Figure 24 shown, which is beneficial to further simplify the positioning structure 30 on the basis of improving the positioning speed.

[0207] Furthermore, the indication and identification part 35 includes an identification for indicating the number of the permanent magnets 5, as Figure 24 shown.

[0208] The indication and identification part 35 includes an identification for indicating the number of the permanent magnets 5, such as Arabic numerals, Chinese characters, etc. The positions of the other permanent magnets 5 can be deduced by the position of one or more of the permanent magnets 5 in cooperation with the number of the permanent magnets 5. Among them, the number of the permanent magnets 5 indicated by the indication and identification part 35 can be the total number of the permanent magnets 5 or the number of some of the permanent magnets 5.

[0209] For example: four permanent magnets 5 are evenly distributed, the number of the positioning parts 34 is one or two, and the indication and identification part 35 adopts the form of 4 or four; five permanent magnets 5 are evenly distributed, the number of the positioning parts 34 is two, and the indication and identification part 35 adopts the form of 5 or five; six permanent magnets 5 are non-uniformly distributed, among which three permanent magnets 5 are evenly distributed according to a certain rule to form a first group, and the other three permanent magnets 5 are evenly distributed according to a certain rule to form a second group. The number of the positioning parts 34 is two, and the number of the indication and identification parts 35 is also two. One of the positioning parts 34 indicates one of the permanent magnets 5 in the first group, and the indication and identification part 35 adopts the form of 3 or three. The other positioning part 34 indicates one of the permanent magnets 5 in the second group, and the indication and identification part 35 adopts the form of 3 or three.

[0210] Embodiment Nine

[0211] The difference from Embodiment Eight is that: the indication and identification part 35 includes an identification for indicating the arrangement form of the permanent magnets 5, as Figure 23 shown.

[0212] The indication identification part 35 includes an identification for indicating the arrangement form of the permanent magnets 5, such as a polygonal structure, a star structure, a multi-point structure with intervals, etc. By the position of one or more of the permanent magnets 5 and in combination with the arrangement form of the permanent magnets 5, the positions of the other permanent magnets 5 can be deduced.

[0213] For example: Four permanent magnets 5 are evenly distributed, and the indication identification part 35 adopts a regular quadrilateral or a four-point form; multiple permanent magnets 5 are distributed in a pentagram shape, and the indication identification part 35 adopts the form of a pentagram.

[0214] Of course, the indication identification part 35 can also include the above-mentioned identifications for indicating the number of the permanent magnets 5 and the arrangement form of the permanent magnets 5 at the same time, which is beneficial to further improving the positioning speed and the magnetization rate.

[0215] In a specific example, 4 permanent magnets 5 are evenly distributed, there are 2 positioning parts 34, and the indication identification part 35 adopts the form of 2-4, where 2 indicates that there are 2 positioning parts 34 and 4 indicates that there are 4 permanent magnets 5 evenly distributed, as Figure 24 shown.

[0216] In another specific example, the indication identification part 35 is a polygonal structure, as Figure 23 shown. The polygonal structure encloses a distribution diagram of multiple permanent magnets 5, and multiple vertices or multiple sides of the polygonal structure represent multiple permanent magnets 5.

[0217] The indication identification part 35 adopts a polygonal structure, and the polygonal structure encloses a distribution diagram of multiple permanent magnets 5. Then, as long as the position of one of the permanent magnets 5 is known, the positions of the other permanent magnets 5 can be deduced according to this distribution diagram. The structure and principle are relatively simple and easy to implement. For example: Three permanent magnets 5 are evenly distributed, and the indication identification part 35 adopts an equilateral triangle; three permanent magnets 5 are unevenly distributed, and the indication identification part 35 adopts a non-equilateral triangle; four permanent magnets 5 are evenly distributed, and the indication identification part 35 adopts a square, as Figure 23 shown; five permanent magnets 5 are evenly distributed, and the indication identification part 35 adopts a regular pentagon.

[0218] Among them, in order to balance the later magnetization accuracy and magnetization rate, generally this scheme is adopted for multiple evenly distributed permanent magnets 5. For the rotor 100 with a radial structure, multiple permanent magnets 5 can be represented by multiple sides of the polygonal structure; for the rotor 100 with a tangential structure, multiple permanent magnets 5 can be represented by multiple vertices of the polygonal structure.

[0219] Of course, the indication identification part 35 is not limited to the above-mentioned form of the polygonal structure. For example: It can also adopt a multi-point structure with intervals, or adopt a structure such as Arabic numerals or Chinese characters.

[0220] In any of the above embodiments, the shape of the positioning portion 34 is circular (as shown in Figure 23 and Figure 24 ), square, triangular, strip-shaped or linear.

[0221] The shape of the positioning portion 34 is not specifically limited, including but not limited to circular, square, triangular, strip-shaped, linear, and can be specifically designed according to the specific structure of the product.

[0222] Embodiment Ten

[0223] A motor 200, as shown in Figure 25 , includes: a rotor 100 and a stator 202 as in any of the above embodiments. The stator 202 is sleeved outside the rotor 100 and cooperates with the rotor 100.

[0224] The motor 200 provided in this embodiment has all the beneficial effects of any of the above embodiments because it includes the rotor 100 in any of the above embodiments, and will not be elaborated here.

[0225] Embodiment Eleven

[0226] A water pump 300, as shown in Figure 26 , includes: a motor 200 and an impeller 302 as in the above embodiments. The impeller 302 is connected to the rotating shaft 1 of the motor 200.

[0227] The water pump 300 provided in this embodiment has all the beneficial effects of any of the above embodiments because it includes the motor 200 in any of the above embodiments, and will not be elaborated here.

[0228] Embodiment Twelve

[0229] A vehicle 400, as shown in Figure 27 , includes: a vehicle body 402 and the water pump 300 in the above embodiment. The water pump 300 is installed in the vehicle body 402.

[0230] The vehicle 400 provided in this embodiment has all the beneficial effects of any of the above embodiments because it includes the water pump 300 in any of the above embodiments, and will not be elaborated here.

[0231] In any of the above embodiments, the vehicle 400 is a new energy vehicle 400.

[0232] Of course, it is not limited to the field of new energy vehicles 400, and can also be applied to technical fields such as traditional fuel vehicles and hybrid vehicles.

[0233] In the present invention, the terms "first", "second", and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term "plural" means two or more, unless otherwise clearly defined. The terms "installed", "connected", "joined", "fixed", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "joined" can be a direct connection or an indirect connection through an intermediate medium. 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 circumstances.

[0234] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "front", "rear", 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 unit referred to must have a specific direction, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0235] In the description of this specification, the descriptions of the terms "one embodiment", "some embodiments", "specific embodiments", etc. mean 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.

[0236] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A rotor, characterized in that, Comprising: A rotor core, within which there is a shaft hole for accommodating a rotating shaft and an installation groove for mounting permanent magnets; Permanent magnets, mounted within the installation groove; A plastic-coated body, connected to the rotor core and at least covering the open end of the installation groove to encapsulate the permanent magnets within the rotor core; Wherein, at least one end of the plastic-coated body is provided with an axially extending portion, and the radially inner end of the axially extending portion is flush with the inner side surface of the rotor core; At least one clearance groove is formed on the inner side surface of the rotor core, the clearance groove axially penetrates at least one end face of the rotor core along the axis of the rotor, and the plastic-coated body includes a clearance portion filled within the clearance groove; The ratio of the remaining arc length A of the inner side surface of the rotor core to the circumference B of the shaft hole is within the range of 0.3 to 0.7; and / or The ratio of the remaining area Sa of the inner side surface of the rotor core to the complete area Sb of the hole wall of the shaft hole is within the range of 0.3 to 0.7; and / or The ratio of the radial depth C of the clearance groove to the diameter D of the shaft hole is within the range of 0.0625 to 0.375; A chamfer is provided at the connecting portion between the radially open end of the clearance groove and the inner side surface of the rotor core.

2. The rotor according to claim 1, wherein At least one end face of the rotor core is provided with a filling groove, and the filling groove communicates with the shaft hole; The axially extending portion includes a filling portion, and the filling portion is filled within the filling groove of the rotor core.

3. The rotor according to claim 2, wherein The filling groove surrounds the shaft hole, and the outer contour of the filling groove is circular, polygonal or petal-shaped.

4. The rotor according to claim 3, wherein The axial depth H of the filling groove is within the range of 2 mm to 10 mm; and / or The ratio of the axial depth H of the filling groove to the axial length L of the rotor core is within the range of 0.03 to 0.3; and / or The outer contour of the filling groove has a circumscribed circle, and the ratio of the diameter W of the circumscribed circle to the diameter d of the outer contour of the rotor core is within the range of 0.24 to 0.

57.

5. The rotor according to claim 1, wherein The ratio of the remaining arc length A of the inner side surface of the rotor core to the circumference B of the shaft hole is within the range of 0.4 to 0.5; and / or The ratio of the remaining area Sa of the inner side surface of the rotor core to the complete area Sb of the hole wall of the shaft hole is within the range of 0.4 to 0.5; and / or The ratio of the radial depth C of the clearance groove to the diameter D of the shaft hole is within the range of 0.2 to 0.

3.

6. The rotor according to any one of claims 1 to 4, wherein The axially extending portion includes an extension portion, and the extension portion is provided on the end face of the plastic-coated body and extends axially away from the rotor core.

7. The rotor according to any one of claims 1 to 4, characterized in that, Further comprising: A gasket, coaxially arranged with the rotor core, and the gasket is provided with a positioning structure for directly or indirectly positioning the position of the permanent magnets; Wherein, the plastic-coated body coats the parts of the rotor core exposed outside the shaft hole and outside the gasket, and coats a part of the gasket exposed outside the shaft hole, and forms an integral structure with the rotor core and the gasket.

8. The rotor according to claim 7, wherein the plastic-coated body comprises a first end layer and a second end layer, the first end layer covers one end face of the rotor core and coats at least a part of the gasket, and the second end layer covers the other end face of the rotor core; the first end layer comprises a first end portion and a second end portion, the first end portion and the second end portion are sequentially connected from inside to outside along the radial direction of the rotor, the diameter D2 of the outer contour of the first end portion is smaller than the diameter D3 of the outer contour of the second end portion, the first end portion coats a part of the gasket and a part of the first end portion corresponds to the end face of the permanent magnet; the second end layer comprises a third end portion and a fourth end portion, the third end portion and the fourth end portion are sequentially connected from outside to inside along the radial direction of the rotor, the diameter D4 of the outer wheel of the third end portion is larger than the diameter D5 of the outer contour of the fourth end portion.

9. The rotor according to claim 8, wherein the thickness of the first end portion is greater than the thickness T3 of the second end portion; the thickness T4 of the third end portion is smaller than the thickness T5 of the fourth end portion.

10. The rotor according to claim 9, wherein the first end portion comprises a protruding portion and a supporting portion, the protruding portion and the supporting portion are sequentially connected from inside to outside along the radial direction of the rotor, the diameter D1 of the outer contour of the protruding portion is smaller than the diameter D2 of the outer contour of the supporting portion, a part of the gasket is embedded in the protruding portion and coated by the protruding portion, the supporting portion corresponds to the end face of the permanent magnet, and the thickness T1 of the protruding portion is greater than the thickness T2 of the supporting portion; or an annular groove is provided on the side peripheral surface of the gasket, and a part of the first end portion is embedded in the annular groove to coat a part of the gasket.

11. The rotor according to claim 7, wherein the end face of the gasket facing away from the rotor core protrudes from the plastic-coated body.

12. The rotor according to claim 11, wherein the axial height H1 of the end face of the gasket facing away from the rotor core protruding from the plastic-coated body is less than or equal to 5 mm.

13. The rotor according to claim 7, wherein the outer contour of the gasket is circular or polygonal; and / or the gasket is provided with a recess and / or a protrusion.

14. The rotor according to claim 13, wherein the outer contour of the gasket is polygonal, a plurality of recesses are provided on at least one end face of the gasket, the number of the recesses on at least one end face is equal to the number of sides of the polygon, and the plurality of recesses are evenly distributed along the circumferential direction of the gasket.

15. The rotor according to claim 7, wherein the positioning structure comprises the outer contour of the gasket; and / or the positioning structure comprises a recess and / or a protrusion provided on the gasket.

16. A motor, characterized in that, Comprising: The rotor according to any one of claims 1 to 15; and A stator, sleeved outside the rotor and cooperating with the rotor.

17. A water pump, characterized in that, Comprising: The electric machine according to claim 16; and An impeller, connected to the rotating shaft of the electric machine.

18. A vehicle, characterized in that, Comprising: A vehicle body; and The water pump according to claim 17, installed in the vehicle body.

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