Permanent magnet motor

Abstract

The utility model discloses a permanent magnet motor, which comprises a motor casing, a front end cover and a rear end cover, the front end cover and the rear end cover are mounted on the motor casing, a stator is mounted in the motor casing, and windings arrayed along the circumferential direction are arranged on the stator; a rotating shaft penetrating through the stator is rotatably mounted on the front end cover and the rear end cover, a rotor core located in the stator is mounted on the rotating shaft, a plurality of mounting grooves uniformly distributed in the circumferential direction are formed in the rotor core, permanent magnets are embedded in the mounting grooves, and protruding parts abutting against the permanent magnets are arranged in the mounting grooves at intervals; fans positioned on the two sides of the rotor iron core are mounted on the rotating shaft; the permanent magnets are embedded in the mounting grooves formed in the rotor iron core, meanwhile, the protrusions are arranged in the mounting grooves to abut against and fix the permanent magnets, in addition, the ventilation channels facilitating heat dissipation of the permanent magnets are formed, and in the running process, the fans at the two ends are driven by the rotating shaft to rotate along with the rotor iron core, so that heat dissipation of the permanent magnets is facilitated. Therefore, air flow is formed in the ventilating duct, and heat flow at the embedding position of the permanent magnet is accelerated.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a permanent magnet motor. Background Art

[0002] Most permanent magnet motors include a rotor core and a stator. A large number of magnetic steel sheets (permanent magnets) are arranged on the rotor core, and excitation coils are provided on the stator. The magnetic force generated by the excitation coils and the magnetic force of the magnetic steel sheets themselves generate a force, thereby realizing the rotation of the rotor core. The permanent magnet motor has the characteristics of low cost, low energy consumption, simple structure, and low failure rate. In terms of performance, it can achieve the performance of synchronous motors, asynchronous motors, and stepper motors, and can replace the above various motors.

[0003] In an environment with a relatively high temperature, the magnetic force of the magnetic steel sheets fades relatively quickly, which will shorten the service life of the permanent magnet motor; for a permanent magnet motor running for a long time, the ambient temperature of the rotor core is also often relatively high, which will also shorten the service life of the permanent magnet motor.

[0004] The existing heat dissipation form of the permanent magnet motor often adopts external arrangement of heat sinks. The heat sinks increase the contact area between the outer shell of the permanent magnet motor and the external air. The heat generated during the operation of the permanent magnet motor is conducted through the outer shell to the surface of the heat sinks for heat dissipation. However, since the permanent magnets are embedded in the rotor core, their heat dissipation cannot be quickly conducted to the housing, and there is still a situation where the heat dissipation efficiency of the permanent magnets is relatively low. Summary of the Utility Model

[0005] (I) Technical Problem

[0006] The purpose of the utility model is to provide a permanent magnet motor to solve the problem of relatively low heat dissipation efficiency of the permanent magnets in the existing permanent magnet motors.

[0007] (II) Technical Solution

[0008] To achieve the above purpose, the utility model provides the following technical solution:

[0009] A permanent magnet motor includes a motor housing, a front end cover and a rear end cover installed on the motor housing. A stator is installed inside the motor housing, and windings are provided on the stator in a circumferential array; a rotating shaft passing through the stator is rotatably installed on the front end cover and the rear end cover. A rotor core located inside the stator is installed on the rotating shaft. A plurality of mounting grooves are circumferentially and evenly arranged on the rotor core. Permanent magnets are embedded in the mounting grooves, and convex portions for pressing against the permanent magnets are arranged at intervals in the mounting grooves; fans located on both sides of the rotor core are installed on the rotating shaft.

[0010] Preferably, the width of the mounting groove is greater than the width of the permanent magnet.

[0011] Preferably, two adjacent mounting grooves are arranged in a "V" shape.

[0012] Preferably, the rotor core is provided with a first through hole located between each group of mounting grooves.

[0013] Preferably, the rotor core is provided with a second through hole between two adjacent groups of mounting grooves.

[0014] Preferably, the shape of the convex part is trapezoidal.

[0015] Preferably, the rotor core includes a plurality of punching sheets, and the plurality of punching sheets are laminated and pressed into an integral structure.

[0016] Preferably, the front end cover and the rear end cover are provided with heat dissipation holes.

[0017] (III) Beneficial Effects

[0018] By providing mounting grooves on the rotor core to embed the permanent magnets, and at the same time providing convex parts in the mounting grooves to achieve pressing and fixing of the permanent magnets, in addition, a ventilation duct for facilitating the heat dissipation of the permanent magnets is formed. During operation, the fans at both ends are driven by the rotating shaft to rotate together with the rotor core, so that air flow is formed in the ventilation duct, realizing the acceleration of the heat flow at the embedding position of the permanent magnets, and quickly realizing the overall heat dissipation through the motor housing, the front end cover and the rear end cover, further improving the heat dissipation effect at the embedding position of the permanent magnets and prolonging the service life of the permanent magnets. Description of the Drawings

[0019] Figure 1 is an exploded structural schematic diagram of an embodiment of the present invention;

[0020] Figure 2 is a structural schematic diagram of the cooperation between the stator and the rotor core in an embodiment of the present invention;

[0021] Figure 3 is Figure 2 the front view structural schematic diagram of;

[0022] Figure 4 is Figure 3 the partial enlarged structural schematic diagram at A in;

[0023] Figure 5 is Figure 2 the side view structural schematic diagram of;

[0024] Figure 6 is a structural schematic diagram of the permanent magnet motor according to an embodiment of the present invention;

[0025] In Figures 1 to 6 , the corresponding relationship between the component names or lines and the drawing reference numerals is:

[0026] Motor housing 1, front end cover 2, rear end cover 3, stator 4, winding 5, rotating shaft 6, rotor core 7, mounting groove 8, permanent magnet 9, convex portion 10, fan 11, first through hole 12, second through hole 13. Detailed implementation

[0027] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0028] See Figures 1 - 6 As shown, in the embodiment of the present invention, a permanent magnet motor is proposed. The permanent magnet motor is a relatively mature product. This embodiment only focuses on improving the heat dissipation efficiency of the permanent magnet, and the other parts not involved can be implemented by existing technologies. Specifically, the permanent magnet motor proposed in this embodiment includes a motor housing 1 and a front end cover 2 and a rear end cover 3 mounted on the motor housing 1. The general structural components of the permanent magnet motor can adopt the existing structures. The motor housing 1, the front end cover 2, and the rear end cover 3 all have heat conduction and heat dissipation effects. During normal use, a heat dissipation device is also provided outside the entire permanent magnet motor for heat dissipation. Specifically, a stator 4 is installed in the motor housing 1, and windings 5 arranged in a circumferential array are provided on the stator 4; a rotating shaft 6 passing through the stator 4 is rotatably installed on the front end cover 2 and the rear end cover 3. Specifically, when installing the rotating shaft 6, one end of the rotating shaft 6 can be installed on the front end cover 2 through a bearing seat, and the other end can be installed on the rear end cover 3, so as to form a support and be able to rotate stably relative to the front end cover 2 and the rear end cover 3. A rotor core 7 located inside the stator 4 is installed on the rotating shaft 6. The rotor core 7 includes a plurality of punching sheets, and the plurality of punching sheets are stacked and pressed into an integral structure. While ensuring the integral structural strength of the rotor core 7, it is beneficial to the heat dissipation of the rotor core 7. A plurality of mounting grooves 8 evenly distributed in the circumferential direction are provided on the rotor core 7. Every two adjacent mounting grooves 8 are taken as a group and can be arranged in a V shape. Permanent magnets 9 are embedded in the mounting grooves 8, and convex portions 10 for pressing against the permanent magnets 9 are arranged at intervals in the mounting grooves 8. After the permanent magnets 9 are supported by the convex portions 10, a ventilation duct with a ventilation effect is formed between the mounting grooves 8 and the permanent magnets 9, and the heat at the embedding position of the permanent magnets 9 is circulated by using the ventilation duct.

[0029] At the same time, fans 11 located on both sides of the rotor core 7 are installed on the rotating shaft 6. After the fans 11 rotate with the rotating shaft 6, they can accelerate the rapid flow of the hot air flow in the ventilation duct, thereby accelerating the heat dissipation of the permanent magnets 9. The internal heat can be dissipated through heat conduction by the motor housing 1, the front end cover 2, and the rear end cover 3.

[0030] Thus, by improving the structure of the mounting groove 8 of the permanent magnet 9 and using the rotating shaft 6 to drive the fan 11, the heat at the permanent magnet 9 is dissipated more quickly, improving the heat dissipation effect of the permanent magnet 9.

[0031] In order to enable the two sides of the mounting groove 8 to also achieve heat dissipation diversion for the permanent magnet 9, the width of the mounting groove 8 is made larger than the width of the permanent magnet 9, so that there is a space between the permanent magnet 9 and the mounting groove 8.

[0032] Specifically, two adjacent mounting grooves 8 are arranged in a V shape, and the number of the specific mounting grooves 8 is determined according to the number of poles of the motor, so that the magnetic field distribution during driving meets the requirements.

[0033] In order to also accelerate the heat dissipation of the rotor core 7 itself, specifically, a first through hole 12 is provided on the rotor core 7 between each group of mounting grooves 8, and a second through hole 13 is provided on the rotor core 7 between two adjacent groups of mounting grooves 8. The heat dissipation of the rotor core 7 is accelerated through the first through hole 12 and the second through hole 13, and at the same time, the heat dissipation in the ventilation duct can be further accelerated by being arranged at adjacent positions of the mounting grooves 8.

[0034] In order to ensure the wear resistance and structural stability of the convex portion 10, the shape of the convex portion 10 is trapezoidal.

[0035] At the same time, heat dissipation holes are provided on the front end cover 2 and the rear end cover 3, which is convenient for accelerating the dissipation of internal heat to the outside of the entire motor.

[0036] In the present invention, unless otherwise clearly defined and limited, terms such as "installation", "connection", "connection", "fixation" and other terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0037] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "left", "right", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of this invention is usually placed. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention. In addition, terms such as "first" and "second" are only used for distinguishing descriptions, and cannot be understood as indicating or implying relative importance.

[0038] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above-described exemplary embodiments, and the present utility model can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present utility model. Any reference signs in the claims should not be construed as limiting the claims involved.

Claims

1. A permanent magnet motor, comprising a motor housing and a front cover and a rear cover mounted on the motor housing, characterized in that: A stator is installed in the motor housing, and a winding arrayed in the circumferential direction is provided on the stator; a rotating shaft passing through the stator is rotatably installed on the front cover and the rear cover, and a rotor core located inside the stator is installed on the rotating shaft, and a plurality of mounting grooves evenly distributed in the circumferential direction are provided on the rotor core, and permanent magnets are embedded in the mounting grooves, and protrusions that press against the permanent magnets are provided at intervals in the mounting grooves; The rotating shaft is provided with fans located on both sides of the rotor core.

2. A permanent magnet motor according to claim 1, characterized in that: The width of the mounting groove is greater than the width of the permanent magnet.

3. A permanent magnet motor according to claim 2, characterized in that: Two adjacent mounting grooves are arranged in a "V" shape.

4. A permanent magnet motor according to claim 3, characterized in that: The rotor core is provided with a first through hole located between each group of mounting grooves.

5. A permanent magnet motor according to claim 4, characterized in that: The rotor core is provided with second through holes between two adjacent groups of mounting grooves.

6. A permanent magnet motor according to any one of claims 1 to 5, characterized in that: The shape of the protrusion is trapezoidal.

7. A permanent magnet motor according to claim 6, characterized in that: The rotor core comprises a plurality of punching sheets, and the plurality of punching sheets are stacked and pressed to form an integral structure.

8. A permanent magnet motor according to claim 7, characterized in that: The front end cover and the rear end cover are provided with heat dissipation holes.

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