A rotor core fixing structure and motor

Abstract

The utility model discloses a rotor core fixing structure and a motor. The rotor core fixing structure includes a rotor support, a rotor core and a pole. The inner ring of the rotor core is provided with a plurality of connection grooves for installing the poles. The connection grooves penetrate the rotor core along the axial direction of the rotor. The connection grooves are arranged so that the poles can only be embedded in the connection grooves along the axial direction of the rotor. A through hole is provided on the rotor support. A locking piece is arranged in the through hole to contact the poles, so that the poles and the rotor support are connected and fixed. The utility model provides a connection groove for embedding the poles on the rotor core, so that the poles and the rotor core have a contact matching surface. The connection between the rotor support and the rotor core is achieved by the locking piece between the rotor support and the poles. When the locking piece is working, the poles are first subjected to force, and the force is transmitted to the rotor core through the contact matching surface, so that the rotor core and the rotor support are tightly fixed. This force transmission method can ensure that the rotor core is subjected to force more evenly and the rotor core and the rotor support have a better fit.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, and in particular to a rotor core fixing structure and a motor. Background Art

[0002] The motor rotor is the rotating part of the motor, including the rotor bracket, rotor core and magnet. In the traditional rotor structure, the rotor core is a full circle and is heat-fitted on the rotor bracket by interference fit. For example, the patent with the announcement number CN213879550U discloses a three-stage motor exciter armature and permanent magnet rotor assembly structure, including a left collar, a right collar, a pressure ring, a retainer, and an exciter armature core, wherein the outer surface of the exciter rotor bracket and the inner surface of the exciter armature core are matched by interference fit.

[0003] However, for large motors, the rotor diameter is usually large, and some motor rotors even have a diameter of more than 1 meter. At this time, it is difficult to install the rotor core of the integral design with the rotor bracket in an interference fit manner, and the operation process is complicated. In response to this problem, some companies have improved the rotor core to a split-flap design, that is, the rotor core punching adopts a fan-shaped sheet design. The fan-shaped rotor core cannot be fitted to the rotor bracket by interference fit, and can only be installed on the rotor bracket by stacking and some appropriate installation methods to form a full circle to withstand the torque caused by the rotation of the rotor.

[0004] For example, the patent with publication number CN105048669A discloses a new type of embedded rotor for a permanent magnet motor and a processing method thereof, which comprises a rotating shaft, a rotor core, and a rotor bracket. The rotating shaft is assembled with the rotor bracket, and the rotor bracket is axially constrained by a rotor heat sleeve ring; the rotor core is composed of a ring of magnetic pole cores fixed to the rotor bracket, and the magnetic pole core is formed by stacking magnetic pole punching sheets; the middle part of the magnetic pole core has a magnetic pole fixing keyway, and both sides of the magnetic pole core are inner grooves, and two adjacent inner grooves constitute a magnetic steel groove, the magnetic pole fixing key is embedded in the magnetic pole fixing keyway, and the magnetic steel is embedded in the magnetic steel groove; magnetic pole baffles are provided at both ends of the rotor core. The processing method steps are as follows: 1) the pole punching sheets are directly punched and laminated into the pole core, and the pole fixing key is inserted into the pole fixing key slot, and the whole is drilled and wired; 2) the rotating shaft and the rotor bracket are assembled; 3) the independent pole cores are assembled on the rotor bracket in sequence to form a complete rotor core; 4) the pole baffle at one end of the rotor core is installed, the magnet is embedded in the magnet slot, and after assembly, the pole baffle at the other end is installed.

[0005] In the above-mentioned embedded new rotor patent, the connection between the pole punching and the rotor bracket is to drill threaded holes in the pole punching and the pole, and then connect the rotor bracket, pole punching and pole into one by bolts. However, such operation has the following defects:

[0006] 1) Poor processability, complicated operation of magnetic pole punching and magnetic pole drilling, and additional production costs;

[0007] 2) The bolts connecting the three are fixed on the iron core. The strength of the rotor core itself is poor, and torque is required when the bolts connect the three. The rotor core cannot withstand high torque and is very likely to be damaged. Utility Model Content

[0008] The technical problem to be solved by the utility model is to provide a rotor core fixing structure which does not need to bear torque, in view of the defects of the prior art.

[0009] The purpose of the utility model is achieved through the following technical solutions:

[0010] A rotor core fixing structure includes a rotor support and a rotor core, and also includes a pole. The inner ring of the rotor core is circumferentially provided with a plurality of connecting grooves for installing the pole. The connecting grooves penetrate the rotor core along the axial direction of the rotor. The connecting grooves are arranged so that the pole can only be embedded in the connecting grooves along the axial direction of the rotor. A through hole is provided on the rotor support, and a locking piece is arranged in the through hole to contact the pole to connect and fix the pole and the rotor support.

[0011] Furthermore, the connecting groove is a T-shaped groove, the T-shaped groove has a horizontal end and a vertical end, and the vertical end of the T-shaped groove is connected to the inner ring of the rotor core.

[0012] Furthermore, the connecting groove is a dovetail groove, and the dovetail groove includes a stretched end and a closed end, and the closed end is connected to the inner ring of the rotor core.

[0013] Furthermore, the locking member is a bolt, and a threaded hole is provided on the pole along the radial direction of the rotor for connection with the locking member.

[0014] Furthermore, the threaded hole passes through the pole.

[0015] Furthermore, the rotor core is of split-petal design.

[0016] Furthermore, the pole has at least one end extending out of the rotor core connection slot, and a tensioning member is provided at the end to tighten the split rotor core into a whole.

[0017] Furthermore, the end portion is provided with an external thread, and the tightening member is a nut.

[0018] Furthermore, the plurality of connecting grooves are evenly distributed on the rotor core.

[0019] The utility model also provides a motor, which is provided with the rotor core fixing structure as described above.

[0020] Compared with the prior art, the utility model has the following beneficial effects:

[0021] 1) A connection groove for embedding the pole rod is provided on the rotor core, so that the pole rod and the rotor core have a contact matching surface. The connection between the rotor bracket and the rotor core is realized by a locking piece between the rotor bracket and the pole rod. When the locking piece is working, the pole rod is first subjected to force, and the force is transmitted to the rotor core through the contact matching surface, thereby clamping and fixing the rotor core and the rotor bracket. This force transmission method can ensure that the rotor core is subjected to more uniform force and the rotor core and the rotor bracket have a better fit.

[0022] 2) For large-diameter rotors, when the rotor core is designed with a split structure, the tensioning members set at the ends of the poles can tighten the split rotor core into a whole to prevent it from falling apart. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A partial cross-sectional view of the rotor core fixing structure described in Example 1;

[0024] Figure 2 It is a cross-sectional view of the rotor core punching sheet described in Example 1 (single petal);

[0025] Figure 3 It is a schematic diagram of the structure of the pole described in Example 1;

[0026] Figure 4 It is a cross-sectional view of the rotor core punching sheet described in Example 2 (single petal);

[0027] Figure 5 It is a cross-sectional view of the rotor core punching sheet described in Example 3 (single petal);

[0028] Figure 6 This is a cross-sectional view of the rotor core punching sheet described in Example 4 (single petal). DETAILED DESCRIPTION

[0029] In order to clearly illustrate the technical features of the present solution, the present technical solution is described in detail below through specific implementation methods and in conjunction with the accompanying drawings.

[0030] In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present application is not limited to the specific embodiments disclosed below.

[0031] In addition, in the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are used only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0032] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0033] In the present application, unless otherwise clearly specified and limited, a first feature "above" or "below" a second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more embodiments or examples.

[0034] Example 1

[0035] A motor, comprising: Figure 1 The rotor core fixing structure shown in the figure includes a rotor bracket 11, a rotor core 12 and a pole 13. The motor of this embodiment is used on ships, and the rotor diameter is relatively large. The diameter of the rotor core 12 is more than 1200 mm. Therefore, the rotor core 12 adopts a petal design, which is a plurality of fan-shaped punching structures assembled into a full circle. The rotor core of the fan-shaped punching is as follows Figure 2 As shown, the inner ring is provided with a plurality of connection grooves 121 for the pole rods 13 to be installed. The connection grooves 121 penetrate the rotor core 12 along the rotor axial direction, and the connection grooves 121 are arranged so that the pole rods 13 can only be embedded in the connection grooves 121 along the rotor axial direction, that is, after the pole rods 13 are embedded in the rotor core connection grooves 121, they cannot be separated from the connection grooves in the rotor radial direction; the plurality of connection grooves 121 are evenly distributed on the entire rotor core. Figure 1 and Figure 3 As shown, a through hole 111 is formed on the rotor support 11, and a threaded hole 131 is formed on the pole 13 along the radial direction of the rotor. A bolt locking member 14 is arranged in the through hole 111 of the rotor support and screwed into the pole threaded hole 131 to connect and fix the pole 13 and the rotor support 11, so that the rotor core 12 and the rotor support 11 are stably connected.

[0036] The pole 13 is a high-strength structure that can meet the large torque requirements of the bolt connection; the rotor core fixing structure provides a connection groove 121 for the pole to be embedded on the rotor core 12, so that the pole 13 and the rotor core 12 have a contact matching surface, which is conducive to tightening the rotor core 12 and the rotor bracket 11, and also enables the rotor core fixing structure to cope well with the situation of a large diameter rotor core. When the bolts connecting the rotor bracket 11 and the rotor core 12 are working, the pole 13 is first subjected to force, and the force is transmitted to the rotor core 12 through the contact matching surface, so that the rotor core 12 and the rotor bracket 11 are tightly fixed. This force transmission method can also ensure that the rotor core 12 is more evenly stressed, and the rotor core 12 and the rotor bracket 11 fit better. In addition, the above-mentioned matching design of the rotor core 12 and the pole 13 can also be well adapted to the petal design of the rotor core 12, which can make the rotor assembly more efficient and convenient.

[0037] To ensure the reliability of the connection between the pole 13 and the rotor bracket 11 by the bolts, the threaded hole 131 on the pole 13 preferably passes through the pole 13 to avoid the situation where the bolts used for connection may not be able to be screwed together to the bottom when the specifications are different.

[0038] In this embodiment, the connecting groove 121 on the rotor core 12 is a T-shaped groove, which has a horizontal end 121a and a vertical end 121b. The vertical end 121b is connected to the inner ring of the rotor core 12, and the surface of the horizontal end 121a close to the inner ring of the rotor core is a slope 121c. The slope design can provide the bolt locking member 14 with better connection assistance. Figure 3 The cross-sectional structure of the pole 13 is adapted to the connecting groove structure, and also has corresponding horizontal and vertical ends. In fact, the structure of the pole 13 can also be simplified to not include the relevant structure that matches the vertical end 121b of the connecting groove 121, that is, only retaining the structure that matches and fits the horizontal end 121a can also achieve the connection purpose.

[0039] like Figure 1and Figure 3 As shown, the pole rod 13 has two end portions 132 extending out of the rotor core connecting groove 121, and the end portions are provided with external threads. The nut tensioning member 15 is screwed into the external threads, which can tighten the rotor core 12 into a whole to prevent the fan-shaped punching sheets from disintegrating, and at the same time, it can also prevent the pole rod 13 from loosening in the connecting groove 121.

[0040] Example 2

[0041] The difference between this embodiment and embodiment 1 is that the rotor diameter is not too large, the rotor core 12 is designed as a whole circle without petals, and the connection between the pole 13, the rotor bracket 11 and the rotor core 12 is the same as that in embodiment 1.

[0042] Example 3

[0043] The difference between this embodiment and embodiment 1 is that: Figure 4 As shown, although the connecting groove 121 is also a T-shaped groove, the surface of its horizontal end 121a close to the inner ring of the rotor core 12 is a plane perpendicular to the vertical end 121b. Compared with the inclined surface design of Example 1, the effect of this plane design is slightly inferior.

[0044] Example 4

[0045] The difference between this embodiment and embodiment 1 is that: Figure 5 As shown, the connecting groove 121 is also a T-slot, but the groove structure is similar to the head design of a screw.

[0046] Example 5

[0047] A motor, comprising: Figure 1 The rotor core fixing structure shown in the figure includes a rotor bracket 11, a rotor core 12 and a pole 13. The rotor diameter of this embodiment is relatively large, and the rotor core adopts a split-petal design, which is a plurality of fan-shaped punching structures assembled into a full circle. The rotor core of the fan-shaped punching is as shown in FIG. Figure 2 As shown, the inner ring is provided with a plurality of connection grooves 121 for the pole rods 13 to be installed. The connection grooves 121 penetrate the rotor core 12 along the rotor axial direction, and the connection grooves 121 are arranged so that the pole rods 13 can only be embedded in the connection grooves 121 along the rotor axial direction, that is, after the pole rods 13 are embedded in the rotor core connection grooves 121, they cannot be separated from the connection grooves 121 in the rotor radial direction; the plurality of connection grooves 121 are evenly distributed on the entire rotor core 12. Figure 1 and Figure 3 As shown, a through hole 111 is formed on the rotor support 11, and a threaded hole 131 is formed on the pole 13 along the radial direction of the rotor. A bolt locking member 14 is arranged in the through hole 111 of the rotor support and screwed into the pole threaded hole 131 to connect and fix the pole 13 and the rotor support 11, so that the rotor core 12 and the rotor support 11 are stably connected.

[0048] like Figure 1 and Figure 3 As shown, the pole rod 13 has two end portions 132 extending out of the rotor core connecting groove 121, and the end portions 132 are provided with external threads. The nut tensioning member 15 is screwed into the external threads, which can tighten the rotor core 12 into a whole to prevent the fan-shaped punching sheets from disintegrating, and also prevent the pole rod 13 from loosening in the connecting groove 121.

[0049] The difference between this embodiment and embodiment 1 is that: Figure 6 As shown, the connection groove 121 is a dovetail groove, which includes an extended end 121d and a closed end 121e, wherein the closed end 121e is connected to the inner circle of the rotor core 12. The structure of the pole 13 is completely compatible with the groove shape of the connection groove 121, and the pole 13 is completely fitted with the outer circle of the rotor bracket 11 at the closed end 121e of the dovetail groove.

[0050] Obviously, the above embodiments are merely examples for clearly illustrating the technical solution of the utility model, and are not intended to limit the implementation methods of the utility model. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made on the basis of the above description. It is not necessary and impossible to list all the implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the utility model should be included in the protection scope of the claims of the utility model.

Claims

1. A rotor core fixing structure, comprising a rotor support and a rotor core, characterized in that: It also includes a pole, and the inner ring of the rotor core is circumferentially provided with a plurality of connecting grooves for installing the pole, and the connecting grooves penetrate the rotor core along the axial direction of the rotor, and the connecting grooves are arranged so that the pole can only be embedded in the connecting grooves along the axial direction of the rotor; a through hole is provided on the rotor bracket, and a locking piece is arranged in the through hole to contact the pole, so as to connect and fix the pole and the rotor bracket.

2. The rotor core fixing structure according to claim 1, characterized in that: The connecting groove is a T-shaped groove having a horizontal end and a vertical end, and the vertical end of the T-shaped groove is connected to the inner ring of the rotor core.

3. The rotor core fixing structure according to claim 1, characterized in that: The connecting groove is a dovetail groove, and the dovetail groove includes a stretched end and a closed end, and the closed end is connected to the inner ring of the rotor core.

4. The rotor core fixing structure according to claim 1, characterized in that: The locking piece is a bolt, and a threaded hole is provided on the pole along the radial direction of the rotor for connection with the locking piece.

5. The rotor core fixing structure according to claim 4, characterized in that: The threaded hole passes through the pole.

6. The rotor core fixing structure according to claim 1, characterized in that: The rotor core is of split-petal design.

7. The rotor core fixing structure according to claim 6, characterized in that: The pole has at least one end extending out of the rotor core connection slot, and a tensioning member is arranged at the end to tighten the split rotor core into a whole.

8. The rotor core fixing structure according to claim 7, characterized in that: The end portion is provided with an external thread, and the tightening member is a nut.

9. The rotor core fixing structure according to claim 1, characterized in that: The plurality of connecting grooves are evenly distributed on the rotor core.

10. A motor, characterized in that: A rotor core fixing structure according to any one of claims 1 to 9 is provided.

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