Plastic package rotor mold, motor plastic package rotor and motor

Abstract

The utility model provides a plastic package rotor mold, a motor plastic package rotor and a motor. The plastic package rotor mold is used for injection molding of the motor plastic package rotor, a plurality of positioning parts are arranged in a mold cavity of the plastic package rotor mold, and the positioning parts are used for circumferentially and / or axially limiting a winding iron core of the motor plastic package rotor. According to the plastic package rotor mold, the positioning part used for positioning the winding iron core in the plastic package rotor of the motor is additionally arranged in the mold cavity of the plastic package rotor mold, accurate positioning of the winding iron core in the forming process of the plastic package rotor of the motor can be achieved by means of the positioning part, deformation of the winding iron core in the forming process is limited, the standard shape of the winding iron core can be maintained in the forming process, and the forming quality of the plastic package rotor is improved. And injection molding is facilitated. As the displacement and deformation of the winding iron core are avoided, the air gap between the magnet and the motor stator can be ensured to be uniform, the dynamic balance of the plastic package rotor of the motor is qualified, the motor runs stably, and the running noise and vibration level of the motor are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of motor rotor forming, and particularly relates to a plastic-sealed rotor mold, a motor plastic-sealed rotor and a motor. Background Art

[0002] As a power component, the motor is widely used in various household appliances, such as the power motor for driving the drum in a washing machine. Whether it is a permanent magnet motor or an excitation motor, in addition to the magnet (permanent magnet or current excitation magnet), its rotor also has a rotor core that constitutes the rotor magnetic circuit. In order to reduce the eddy current loss in the iron core and the thermal effect of the hot iron core, the rotor core is usually made by punching and laminating silicon steel sheets in the prior art.

[0003] Similar technical solutions are already relatively mature in this field. For example, the Chinese invention patent with the publication number CN115912711A and the name "A Motor Rotor Structure" has already disclosed a rotor structure with a rotor core made by laminating silicon steel sheets. Although the application of silicon steel sheet lamination technology can reduce the eddy current loss and thermal effect of the iron core, there is still room for improvement in the manufacturing process. The main problem with using silicon steel sheet punching and lamination technology to manufacture the rotor core is that the utilization rate of the silicon steel strip material is limited, which is restricted by the punching technology itself. Even if the shape of the rotor core is optimized, it is difficult to achieve a qualitative improvement in its material utilization rate.

[0004] In order to improve the material utilization rate when manufacturing the iron core, the winding technology can be applied to manufacture the rotor core. Since the wound iron core is prone to circumferential deformation during the rotor forming process, this may lead to distortion of the air gap magnetic field waveform of the motor, too large dynamic balance, and abnormal vibration and noise. Summary of the Utility Model

[0005] In order to solve the deformation problem of the wound iron core during the rotor forming process, this application provides a plastic-sealed rotor mold, a motor plastic-sealed rotor and a motor.

[0006] This application provides a plastic-sealed rotor mold for the injection molding of a motor plastic-sealed rotor. A plurality of positioning parts are arranged in the mold cavity of the plastic-sealed rotor mold, and the positioning parts are used for circumferential and / or axial limiting of the motor plastic-sealed rotor.

[0007] Preferably, the positioning parts are arranged in a circular circumference corresponding to the position of the wound iron core.

[0008] Preferably, the positioning parts include a circumferential positioning part and an end face positioning part; both the circumferential positioning part and the end face positioning part extend from the surface of the mold cavity of the plastic-sealed rotor mold towards the inside of the mold cavity to form a positioning structure protruding from the surface of the mold cavity.

[0009] Preferably, the positioning portion includes a circumferential positioning portion which extends from the surface of the cavity of the plastic-encapsulated rotor mold into the cavity to form a positioning structure protruding from the cavity surface;

[0010] The circumferential positioning portion includes an inner circle positioning portion and / or an outer circle positioning portion;

[0011] If the circumferential positioning portion includes a plurality of inner circle positioning portions, the inner circle positioning portions are arranged circumferentially in the cavity along the inner circle surface of the wound iron core, and the inner circle positioning portion has a positioning structure that abuts against the inner circle surface of the wound iron core to determine the radial position of the wound iron core at the local part where the inner circle positioning portion is located;

[0012] If the circumferential positioning portion includes a plurality of outer circle positioning portions, the outer circle positioning portions are arranged circumferentially in the cavity along the outer circle surface of the wound iron core, and the outer circle positioning portion has a positioning structure that abuts against the outer circle surface of the wound iron core to determine the radial position of the wound iron core at the local part where the outer circle positioning portion is located.

[0013] Preferably, the circumferential positioning portion includes an inner circle positioning portion and an outer circle positioning portion; the inner circle positioning portion and the outer circle positioning portion are arranged staggeredly along the circumferential direction of the plastic-encapsulated rotor of the motor.

[0014] Preferably, the positioning portion includes an end face positioning portion; the end face positioning portion extends from the surface of the cavity of the plastic-encapsulated rotor mold into the cavity to form a positioning structure protruding from the cavity surface;

[0015] The end face positioning portion includes an upper end face positioning portion and / or a lower end face positioning portion;

[0016] If the end face positioning portion includes a plurality of upper end face positioning portions, the upper end face positioning portions are arranged circumferentially along the end face of the wound iron core, and the upper end face positioning portion) has an upper end face positioning structure protruding from the cavity to keep in contact with the upper end face of the wound iron core and position the axial position of the wound iron core;

[0017] If the end face positioning portion includes a plurality of lower end face positioning portions, the lower end face positioning portions are arranged circumferentially along the end face of the wound iron core, and the lower end face positioning portion has a lower end face positioning structure protruding from the cavity to keep in contact with the lower end face of the wound iron core) and position the axial position of the wound iron core.

[0018] Preferably, the end face positioning portion includes an upper end face positioning portion and a lower end face positioning portion; the upper end face positioning portion and the lower end face positioning portion belong to the upper mold and the lower mold of the plastic-encapsulated rotor mold respectively.

[0019] Preferably, the positioning portion has a draft angle conducive to demolding.

[0020] The present application further provides a plastic-encapsulated rotor of an electric machine, which rotates in cooperation with a stator and includes an injection-molded housing, a wound iron core and a plurality of magnets embedded in the injection-molded housing;

[0021] The plurality of magnets are arranged in a circumferential pattern around the rotation axis of the injection-molded housing;

[0022] The wound iron core is mounted in a ring shape around the rotation axis and is located on the side of the magnets away from the stator mounting;

[0023] A positioning groove is formed in the injection-molded housing corresponding to the positioning portion of the plastic-encapsulated rotor mold described in any one of the above.

[0024] The present application also provides an electric machine including the above-mentioned plastic-encapsulated rotor of the electric machine.

[0025] In the plastic-encapsulated rotor mold of the present utility model, a positioning portion for positioning the wound iron core in the plastic-encapsulated rotor of the electric machine is added in its mold cavity. With the aid of the positioning portion, accurate positioning of the wound iron core during the molding process of the plastic-encapsulated rotor of the electric machine can be achieved, and the deformation of the wound iron core during molding is restricted, which helps to maintain the standard shape of the wound iron core during the molding process and is conducive to injection molding and shaping. Since the displacement and deformation of the wound iron core are avoided, the air gap between the magnets and the stator of the electric machine can be ensured to be uniform, the dynamic balance of the plastic-encapsulated rotor of the electric machine is qualified, the electric machine runs smoothly, and the running noise and vibration level of the electric machine are reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a perspective view of the plastic-encapsulated rotor 1 of the electric machine of the present utility model;

[0027] Figure 2 is a cross-sectional view of the plastic-encapsulated rotor 1 of the electric machine of the present utility model;

[0028] Figure 3 is a simplified cross-sectional view of another embodiment of the plastic-encapsulated rotor 1 of the electric machine of the present utility model;

[0029] Figure 4 is a winding diagram of the wound iron core 13 of the plastic-encapsulated rotor 1 of the electric machine of the present utility model;

[0030] Figure 5 is a winding diagram of another winding method of the wound iron core 13 of the plastic-encapsulated rotor 1 of the electric machine of the present utility model;

[0031] Figure 6 is a cross-sectional view of the plastic-encapsulated rotor 1 of the electric machine of the present utility model;

[0032] Figure 7 is a perspective view of the lower mold of the plastic-encapsulated rotor mold 3 of the present utility model;

[0033] Figure 8Schematic diagram of the lower die of the plastic-sealed rotor mold 3 of the present utility model after embedding the wound iron core 13;

[0034] Figure 9 Stereoscopic schematic diagram of the upper die of the plastic-sealed rotor mold 3 of the present utility model.

[0035] In the figure:

[0036] 1: Motor plastic-sealed rotor; 11: Injection molding housing; 12: Magnet; 13: Wound iron core; 131: Inner circle positioning groove; 132: Outer circle positioning groove; 133: Upper end face positioning groove; 134: Lower end face positioning groove; 13E: End face positioning groove; 13F: Circumferential positioning groove; 13G: Positioning groove; 14: Bush; 15: Support member; 2: Stator; 3: Plastic-sealed rotor mold; 31: Inner circle positioning part; 32: Outer circle positioning part; 33: Upper end face positioning part; 34: Lower end face positioning part; 35: First positioning insert; 36: Second positioning insert; 37: Third positioning insert; 3E: End face positioning part; 3F: Circumferential positioning part; 3G: Positioning part; O: Rotation axis. Specific embodiments

[0037] The following combines the drawings and specific embodiments to elaborate on the present utility model in detail. In this specification, the dimensions of the drawings do not represent the actual size ratio. The drawings are only used to reflect the relative positional relationship and connection relationship between components. Components with the same name or the same reference numeral represent similar or identical structures, and are for illustrative purposes only.

[0038] Figure 1 General schematic diagram of an embodiment of the motor plastic-sealed rotor of the present utility model, Figure 2 Along Figure 1 The cross-sectional schematic diagram of the A-A longitudinal section in. The main body of the motor plastic-sealed rotor 1 is the injection molding housing 11, and several magnets 12 and wound iron cores 13 are embedded in the injection molding housing 11. Among them, several magnets 12 are arranged circumferentially around the rotation axis O of the injection molding housing 11. In the embodiment shown in the figure, the magnets 12 of the rotor surround the outer periphery of the stator, and there is a uniform air gap that meets the requirements between the magnets and the stator. The wound iron core 13 is also installed around the rotation axis of the injection molding housing 11, generally close to or in contact with the magnets 12 in position to form a ring around the rotation axis O. In order to ensure that the distance between the magnets 12 and the stator meets the air gap requirements, the wound iron core 13 is obviously arranged on the side of the magnets 12 away from the motor stator. As Figure 1In an embodiment, the plastic-encapsulated rotor 1 of the motor is sleeved on the outer periphery of the motor stator. At this time, the motor stator is arranged in the inner cavity of the plastic-encapsulated rotor 1 relative to the magnet 12, and the wound iron core 13 is formed outside the magnet 12 in the plastic-encapsulated rotor 1. Based on the general understanding of those skilled in the art, other functional parts may not be excluded in the structure of the plastic-encapsulated rotor 1 of the motor. For example, in order to ensure the reliable connection between the injection-molded housing 11 and the corresponding rotating shaft parts, a bushing made of metal, nylon or other hard materials may be embedded in the injection-molded housing 11. On the other hand, in order to ensure the structural strength of the injection-molded housing 11, it is not excluded to pre-embed a support member 15 in the injection-molded housing 11 by means of insert injection or other processes. The support member 15 may be a metal shell plate part pre-stamped into a predetermined shape.

[0039] The plastic-encapsulated rotor 1 of the present utility model is not limited to a specific outer rotor or inner rotor. Figure 3 It is a schematic diagram of another embodiment of the injection-molded rotor of the motor of the present utility model, which is an inner rotor structure, and the motor stator is located outside the plastic-encapsulated rotor 1. In this case, the wound iron core 13 is annular around the rotating shaft O of the injection-molded housing 11. Based on the principle that the magnet 12 is as close as possible to the stator 2, several magnets 12 should be arranged in a circumferential pattern on the outer side of the wound iron core 13, that is, on the side close to the stator 2, to provide a sufficiently small air gap between the magnet 12 and the stator 2.

[0040] Figure 4 It is a schematic diagram of the structure of the wound iron core 13. The wound iron core 13 is formed by winding a steel strip. As shown in the figure, when winding, there is a winding plane S formed by winding the steel strip. The original plane of the steel strip is defined as D. The winding plane should first be perpendicular to the steel strip plane D. Secondly, in order for the steel strip to always be within the winding plane S during winding without undergoing a spiral movement of rising / falling deviating from the winding plane S, the winding plane S should be parallel to the extending direction F of the steel strip. The reason for using the wound iron core is mainly to utilize the fact that the layers of the iron core formed by winding are separated from each other to avoid the generation of eddy currents inside the wound iron core 13, resulting in a large amount of power being consumed in the form of heat loss. This is the same as the ultimate purpose of using the process method of punching and laminating silicon steel sheets, which is to reduce the energy loss caused by eddy currents and the resulting heat dissipation problems by avoiding the use of a solid iron core. However, the application Figure 4 The advantage of the wound iron core 13 is that only a steel strip raw material with a specific width needs to be used for winding operation to obtain the wound iron core 13. There is no need for punching the raw material steel strip and laminating operation. The improved wound iron core 13 mentioned above means an almost 100% material utilization rate of the steel strip, thus the material cost can be reduced. On the other hand, its winding operation also has a certain process simplification compared with the process flow of punching and then laminating.

[0041] Figure 51 is a schematic diagram of another embodiment of the wound core 13. The wound core 13 is wound from a steel strip. As shown in the figure, the wound core 13 can be stacked by spiral winding in a plane, and its winding plane S is parallel to the steel strip plane D. Each layer of winding is stacked in the thickness direction. This winding method can also achieve almost 100% utilization of materials and reduce energy loss and temperature rise caused by eddy currents. Figure 5 The winding method may be better than Figure 4 The method is a little difficult because Figure 5 The winding method depends on the calendering deformation of the steel strip in the plane to make the steel strip form the required curvature, which generally requires the development of specific calendering tooling. Therefore, from the perspective of process design, Figure 4 The embodiment is preferred, however Figure 5 The embodiments are still feasible.

[0042] The body of the wound core 13 may not be finely controlled in terms of its roundness and dynamic balance during the process of winding. On another level, the core characteristics of the wound structure are relatively soft. Even if it has been finely controlled in the early stage and the size meets the standard, it may still be deformed during injection molding. Considering that the wound core 13 will be fixed in the injection molding shell 11 during the injection molding process of the injection molding shell 11, as long as the shape of the wound core 13 in the injection molding shell 11 can be guaranteed to be standardized, the fine control in the previous winding process is not very necessary. For this reason, in order to ensure the performance of the obtained motor plastic rotor 1, it is necessary to position and correct the wound core 13 during injection molding. Only when the shape of the wound core 13 during injection molding is accurately controlled, the motor plastic rotor 1 after injection molding can have a roundness that meets the standard, thereby ensuring that the air gap between any magnet 12 and the stator 2 is uniform, and ensuring that the motor plastic rotor 1 has the required dynamic balance characteristics. With the support of the above performance, the motor plastic rotor 1 can operate smoothly and reliably, eliminating unnecessary vibration and noise.

[0043] For this reason, Figure 6 The cross-sectional schematic diagram is shown. A plurality of positioning grooves 13G may be distributed circumferentially around the winding core 13 in the injection molding shell 11, and the winding core 13 is partially exposed in the positioning grooves 13G. The mold structure may enter the positioning grooves 13G during injection molding to position the axial position of the winding core 13 in the injection molding shell 11 and the position of each part in the circumference. Thus, on the one hand, the winding core 13 is accurately positioned axially along the rotation axis O, and on the other hand, the mold inserts entering the circumferentially distributed positioning grooves 13G can standardize the circumferential roundness of the winding core 13 to avoid circumferential deformation of the winding core 13 and to avoid the air gap between different magnets 12 and the stator 2 from changing beyond the range.

[0044] like Figure 6As shown, the positioning groove 13G includes a circumferential positioning groove 13F and an end face positioning groove 13E for circumferential positioning and axial end face positioning of the wound core 13 respectively. The circumferential positioning groove 13F includes an inner circle positioning groove 131 and / or an outer circle positioning groove 132. The circumferential positioning groove 13F can be only the circumferentially distributed inner circle positioning groove 131. At this time, a part of the inner circle surface of the wound core 13 is exposed in each inner circle positioning groove 131. The insert on the mold enters the inner circle positioning groove 131 and contacts and positions the inner circle surface of the wound core 13 to achieve the circumferential positioning of the wound core 13. Naturally, the circumferential positioning groove 13F can also be only the circumferentially distributed outer circle positioning groove 132, and its working mode is the same as that of the inner circle positioning groove 131, but the positioning surface is the outer circle surface of the wound core 13. It is also possible to simultaneously set the circumferentially distributed inner circle positioning groove 131 and the circumferentially distributed outer circle positioning groove 132, that is, to position the outer circle surface and the inner circle surface of the wound core 13 at the same time to improve the circumferential positioning accuracy. The end face positioning groove 13E includes an upper end face positioning groove 133 and / or a lower end face positioning groove 134. Several upper end face positioning grooves 133 can be circumferentially arranged only, or several lower end face positioning grooves 134 can be circumferentially arranged only. As the name implies, the upper end face positioning groove 133 is used to expose a part of the upper end face of the wound core 13 to facilitate the positioning of the wound core 13 by the mold insert; the lower end face positioning groove 134 is used to expose a part of the lower end face of the wound core 13 to facilitate the positioning of the wound core 13 by the mold insert. Different from the circumferential positioning groove 13F, the preferred solution for the end face positioning groove 13E is to simultaneously set the upper end face positioning groove 133 and the lower end face positioning groove 134. That is, to position the lower end face and the lower end face of the wound core 13 at the same time to ensure the accurate position of the wound core 13 in the axial direction. This is different from the circumferential positioning groove 13F. It is basically sufficient to set only the inner circle positioning groove 131 or the outer circle positioning groove 132 in the circumferential positioning groove 13F. The reason is that the wound core 13 is annular. When one of the outer circle surface or the inner circle surface is restricted and positioned, its circumferential shape is basically determined. However, along the axial direction, only positioning one side end face cannot restrict the displacement of the wound core 13 in this direction. Back to Figure 6 the schematic diagram of Figure 6 , the inner circle positioning groove 131, the outer circle positioning groove 132, the upper end face positioning groove 133 and the lower end face positioning groove 134 are only defined and distinguished from the functional perspective for the 13G of the injection molded housing 11. This does not mean that in a specific embodiment, the inner circle positioning groove 131, the outer circle positioning groove 132, the upper end face positioning groove 133 and the lower end face positioning groove 134 must be physically separated. The technical solutions formed by any combination should also be considered to be within the scope of the above-described embodiments. For example Figure 6 shows a technical solution in which the inner circle positioning groove 131 and the lower end face positioning groove 134 are integrally arranged as a single entity groove.

[0045] In order to ensure the positioning accuracy of the wound core 13 during injection molding, the plastic-sealed rotor mold should have a positioning portion 3G for positioning the wound core 13. According to the injection molding process, it is obvious that the positioning portion 3G and the positioning groove 13G can correspond to each other and are distributed circumferentially along the wound core 13. Figure 7 , Figure 9 are respectively schematic diagrams of the upper mold and the lower mold of the plastic-sealed rotor mold 3. Figure 8 is a schematic diagram of the lower mold after the wound core 13 is embedded. The positioning portion 3G of the plastic-sealed rotor mold 3 includes a circumferential positioning portion 3F and an end face positioning portion 3E. Both the circumferential positioning portion 3F and the end face positioning portion 3E extend from the cavity surface of the mold into the cavity to form a fulcrum protruding from the cavity surface.

[0046] Among them, as Figure 7 shown, the circumferential positioning portion 3F includes a plurality of inner circle positioning portions 31 arranged circumferentially and / or a plurality of outer circle positioning portions 32 arranged circumferentially. Among them, a plurality of inner circle positioning portions 31 should be arranged in the cavity generally along the circle where the inner circle surface of the wound core 13 is located. The inner circle positioning portion 31 has a positioning structure that abuts against the inner circle surface of the wound core 13 to determine the radial position of the wound core 13 at the local part where the inner circle positioning portion 31 is located. The positioning structure can be line-fitted or surface-fitted with the inner circle surface of the wound core 13 to ensure positioning. The circumferential positioning can also be achieved through the outer circle positioning portion 32, which is arranged in the cavity along the circle where the outer circle of the wound core 13 is located. The outer circle positioning portion 32 has a positioning structure that abuts against the outer circle surface of the wound core 13 to determine the radial direction of the wound core 13 at the local part where the outer circle positioning portion is located. To achieve this purpose, the positioning structure of the outer circle positioning portion 32 can be line-fitted or surface-fitted with the outer circle surface of the wound core 13 to ensure the radial position of the wound core 13 at the local part of the outer circle positioning portion 32. With the cooperation of a plurality of circumferential outer circle positioning portions 32 or a plurality of circumferential inner circle positioning portions 31, the circumferential position of the wound core 13 can be positioned, thereby standardizing the roundness of the wound core 13 during injection molding. Based on this, it is preferable to set both the inner circle positioning portion 31 and the outer circle positioning portion 32 to achieve better circumferential positioning of the wound core 13. To avoid the torsional deformation of the wound core 13, the positioning structures of the inner circle positioning portion 31 and the outer circle positioning portion 32 should preferably extend at least along the axial direction of the wound core 13.

[0047] Refer to Figure 7, a plurality of circumferentially arranged end face positioning portions 3E are used for axially positioning the winding core 13. The end face positioning portion 3E generally includes an upper end face positioning portion 33 and / or a lower end face positioning portion 34. A plurality of upper end face positioning portions 33 should be circumferentially arranged along the projection position where the winding core 13 is located in the mold cavity. The upper end face positioning portion 33 has an upper end face positioning structure protruding from the mold cavity, which is in contact with the upper end face of the winding core 13 to define the axial position of the winding core 13. Similarly, it is also possible to arrange a plurality of outer circle positioning portions 34 and use the lower end face positioning structure of the lower end face positioning portion 34 to axially limit the winding core 13. In a preferred solution, the upper end face positioning portion 33 and the lower end face positioning portion 34 are simultaneously arranged to reasonably define the axial position of the winding core 13. At this time, the upper end face positioning portion 33 and the lower end face positioning portion 34 generally belong to the upper mold and the lower mold respectively, so as to facilitate the entry of the winding core 13.

[0048] Reference Figure 7 , positioning portions 3G such as the inner circle positioning portion 31, the outer circle positioning portion 32, the upper end face positioning portion 33, and the lower end face positioning portion 34 are all installed in the mold cavity in the form of detachable mold inserts, so as to facilitate the repair and adjustment of the positioning structure of the positioning portion 3G after disassembly. The above positioning portions 3G can be separately arranged. For the sake of simplifying the structure and reducing parts, etc., it is preferably integrally arranged, and the lower end face positioning portion 34 is integrally arranged with the inner circle positioning portion 31. In the plastic encapsulated rotor mold 3, a plurality of first positioning inserts 35 protruding from the mold cavity are detachably arranged circumferentially, and the lower end face positioning portion 34 and the inner circle positioning portion 31 are formed on the first positioning insert 35. In some other technical solutions, it is not excluded that the inner circle positioning portion 31, the outer circle positioning portion 32, and the lower end face positioning portion 34 are simultaneously formed on the first positioning insert 35. Or as Figure 7 shown, a plurality of second positioning inserts 36 are detachably arranged circumferentially in the plastic encapsulated rotor mold 3, and the outer circle positioning portion 32 is formed at least on the second positioning insert 36, and the lower end face positioning portion 34 can be further formed on the second positioning insert 36. Reference Figure 9 , the upper end face positioning portion 33 is generally independently arranged relative to the insert where the lower end face positioning portion 34 is located, which is convenient for placing the winding core 13. For this reason, a third positioning insert 37 can be arranged in the mold, and the upper end face positioning portion 33 is formed on the third positioning insert 37. The lower end face positioning portion 34 and the upper end face positioning portion 33 are relative to the two end faces of the winding core 13 and do not have a clear orientation meaning. In reality, which end face is defined as the upper end face depends on actual needs. In a preferred technical solution, appropriate guiding structures and draft angles can be set for the above positioning portions 3G, so as to facilitate the smooth separation between the positioning portions 3G and the injection molded rotor mold during the demolding process.

[0049] The above content is only a description of the preferred embodiments of the present invention, and does not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention shall fall within the protection scope determined by the claims of the present invention.

Claims

1. A plastic-encapsulated rotor mold, used for injection molding of a plastic-encapsulated rotor of a motor, characterized in that: A plurality of positioning parts (3G) are arranged in the mold cavity of the plastic-encapsulated rotor mold, and the positioning parts (3G) are used to limit the wound iron core of the plastic-encapsulated rotor of the motor in the circumferential direction and / or axial direction.

2. The plastic-encapsulated rotor mold according to claim 1, characterized in that: The positioning portions (3G) are arranged in a circular shape corresponding to the positions of the wound iron core (13).

3. The plastic-encapsulated rotor mold according to claim 1, characterized in that: The positioning portion (3G) comprises a circumferential positioning portion (3F) and an end surface positioning portion (3E); the circumferential positioning portion (3F) and the end surface positioning portion (3E) both extend from the mold cavity surface of the plastic-encapsulated rotor mold toward the inside of the mold cavity to form a positioning structure protruding from the mold cavity surface.

4. The plastic-encapsulated rotor mold according to claim 1, characterized in that: The positioning portion (3G) comprises a circumferential positioning portion (3F), and the circumferential positioning portion (3F) extends from the mold cavity surface of the plastic-sealed rotor mold toward the inside of the mold cavity to form a positioning structure protruding from the mold cavity surface; The circumferential positioning portion (3F) comprises an inner circle positioning portion (31) and / or an outer circle positioning portion (32); If the circumferential positioning portion (3F) includes a plurality of inner circle positioning portions (31), the inner circle positioning portions (31) are arranged in a circumferential manner in the mold cavity along the inner circle surface of the wound core (13), and the inner circle positioning portions (31) have a positioning structure that abuts against the inner circle surface of the wound core (13) to determine the radial position of the wound core (13) at the location of the inner circle positioning portions (31); If the circumferential positioning portion (3F) includes a plurality of outer circular positioning portions (32), the outer circular positioning portions (32) are arranged in a circular pattern in the mold cavity along the outer circular surface of the wound core (13), and the outer circular positioning portions (32) have a positioning structure that abuts against the outer circular surface of the wound core (13) to determine the radial position of the wound core (13) at the location of the outer circular positioning portions (32).

5. The plastic-encapsulated rotor mold according to claim 4, characterized in that: The circumferential positioning portion (3F) comprises an inner circle positioning portion (31) and an outer circle positioning portion (32); the inner circle positioning portion (31) and the outer circle positioning portion (32) are staggered along the circumferential direction of the plastic-encapsulated rotor of the motor.

6. The plastic-encapsulated rotor mold according to claim 3, characterized in that: The positioning portion (3G) comprises an end surface positioning portion (3E); the end surface positioning portion (3E) extends from the mold cavity surface of the plastic-encapsulated rotor mold toward the inside of the mold cavity to form a positioning structure protruding from the mold cavity surface; The end surface positioning portion (3E) comprises an upper end surface positioning portion (33) and / or a lower end surface positioning portion (34); If the end surface positioning portion (3E) includes a plurality of upper end surface positioning portions (33), the upper end surface positioning portions (33) are arranged circumferentially along the end surface of the wound core (13), and the upper end surface positioning portions (33) have an upper end surface positioning structure protruding from the mold cavity so as to maintain contact with the upper end surface of the wound core (13) and position the axial position of the wound core (13); If the end face positioning portion (3E) includes a plurality of lower end face positioning portions (34), the lower end face positioning portions (34) are arranged in a circle along the end face of the wound core (13), and the lower end face positioning portions (34) have a lower end face positioning structure protruding from the mold cavity so as to maintain contact with the lower end face of the wound core (13) and position the axial position of the wound core (13).

7. The plastic-encapsulated rotor mold according to claim 6, characterized in that: The end surface positioning portion (3E) comprises an upper end surface positioning portion (33) and a lower end surface positioning portion (34); the upper end surface positioning portion (33) and the lower end surface positioning portion (34) respectively belong to the upper mold and the lower mold of the plastic-sealed rotor mold.

8. The plastic-encapsulated rotor mold according to any one of claims 1 to 7, characterized in that: The positioning portion (3G) has a draft angle that is beneficial for demoulding.

9. A plastic-encapsulated rotor of a motor, rotating in cooperation with a stator (2), characterized in that: It comprises an injection-molded housing (11) and a wound iron core (13) and a plurality of magnets (12) embedded in the injection-molded housing (11); A plurality of magnets (12) are arranged in a circle around a rotation axis (O) of the injection-molded housing (11); The winding core (13) is installed in a ring shape around the rotating shaft (O), and the winding core (13) is located on a side of the magnet (12) that is installed away from the stator (2); A positioning groove (13G) is formed on the injection-molded housing (11) corresponding to the positioning portion (3G) of the plastic-encapsulated rotor mold according to any one of claims 1 to 8.

10. A motor, characterized in that: It comprises the plastic-encapsulated rotor of the motor as claimed in claim 9.

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