Heat dissipation structure of permanent magnet motor and motor

Abstract

The utility model relates to the technical field of motors, in particular to a heat dissipation structure of a permanent magnet motor and the motor. The heat dissipation structure comprises a flywheel and a stator, the flywheel comprises a bottom plate and a side plate which are connected, the side plate is annular, a plurality of magnetic steel is arranged on the inner wall of the side plate in the circumferential direction, the stator is installed in the range defined by the magnetic steel, a plurality of ventilation holes are formed in the bottom plate, and a protection ring is arranged on the inner side of the side plate and located between the magnetic steel and the bottom plate. A plurality of fan blades are arranged on the protective ring in the circumferential direction. By adopting the scheme, when the motor works, the flywheel drives the retaining ring to rotate, so that the fan blades are driven to rotate. The fan blades rotate to suck cooling air outside the motor from the ventilation holes, the cooling air enters gaps between rotor magnetic steel and a stator to take away heat on the surfaces of the magnetic steel and an iron core, and part of the cooling air passes through gaps of stator grooves to take away heat of copper wires, so that the interior of the motor is cooled, and the cooling effect of the interior of the motor is effectively improved.

Description

Technical Field

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

[0002] Due to the advantages of high efficiency and high power density, permanent magnet motors have been widely used in power equipment such as fans and water pumps.

[0003] In the rotor structure of a permanent magnet motor, a ring of ferrite magnets is assembled around the iron core. It interacts with the energized stator coil to generate an alternating magnetic field, thereby driving the rotor to rotate. In the actual assembly process, in order to ensure the stability of the magnets, a flywheel is usually set, the magnets are pasted on the inner surface of the flywheel, and protective rings are added at both ends of the whole ring of magnets for further fixation.

[0004] In the prior art, in order to solve the heat dissipation problem of permanent magnet motors, heat dissipation devices are usually provided. The existing heat dissipation device for the rotor of a permanent magnet motor uses blades fixed on the outer side of the end plate of the motor rotor. When the motor rotates, the blades are driven to rotate to generate cooling air. This heat dissipation method can only take away the heat on the surface of the rotor end, and the heat dissipation effect of the motor rotor is significantly insufficient. When the motor is used for a long time, it generates serious heat, and the increase in temperature causes an increase in the copper loss of the motor, and the efficiency and service life of the motor will both decrease. Summary of the Utility Model

[0005] Aiming at the above defects, the technical problem to be solved by the utility model is to provide a heat dissipation structure and a motor of a permanent magnet motor. The heat dissipation structure can improve the heat dissipation effect inside the motor, thereby ensuring the working efficiency and service life of the motor.

[0006] The above technical purpose of the utility model is achieved by the following technical solutions:

[0007] In the first aspect, a heat dissipation structure of a permanent magnet motor is provided, which includes a flywheel and a stator. The flywheel includes a bottom plate and a side plate connected to each other. The side plate is annular. A plurality of magnets are arranged along the circumferential direction on the inner wall of the side plate. The stator is installed within the range enclosed by the magnets. A plurality of ventilation holes are opened on the bottom plate. A protective ring is arranged on the inner side of the side plate. The protective ring is located between the magnets and the bottom plate. A plurality of fan blades are arranged along the circumferential direction on the protective ring.

[0008] By adopting the above solution, since the fan blades are provided on the protective ring on the inner side of the side plate, when the motor is working, the flywheel rotates relative to the stator, the flywheel drives the protective ring to rotate, and thus drives the fan blades to rotate. The rotation of the fan blades sucks the air outside the motor from the ventilation holes of the side plate into the inner side of the flywheel, thereby cooling the inside of the motor, improving the cooling effect inside the motor, and thus ensuring the working efficiency and service life of the motor. Since the fan blades are arranged inside the protective ring, the gap between the magnetic steel and the bottom plate can be fully utilized, and the overall volume of the motor can be controlled.

[0009] The present utility model is further configured such that the bottom plate and the magnetic steel jointly clamp the protective ring. Since the magnetic steel and the bottom plate jointly clamp the protective ring, the stability of the protective ring is relatively high. And both the magnetic steel and the bottom plate are in close contact with the protective ring, which makes the distance between the magnetic steel and the bottom plate relatively small, facilitating the control of the overall volume of the motor.

[0010] The present utility model is further configured such that a plurality of positioning members are provided on one side of the protective ring, and each positioning member is clamped between two corresponding magnetic steels. By positioning the magnetic steel with the positioning member, the stability of the magnetic steel is enhanced. In addition, the positioning member is clamped between adjacent magnetic steels, which enhances the overall relevance between the protective ring and the magnetic steel.

[0011] The present utility model is further configured such that the positioning member is columnar, and the cross-section of the positioning member is polygonal. The cross-section of the columnar positioning member is polygonal, which enables the positioning member to be accommodated between two adjacent magnetic steels, making the structure compact.

[0012] The present utility model is further configured such that the cross-section of the positioning member is quadrilateral, and one side of the positioning member close to the adjacent magnetic steel is in contact with the side surface of the magnetic steel. Since the positioning member is quadrilateral and the side surface is in contact with the magnetic steel, the positioning member has stronger tightness with the magnetic steel and better overall stability.

[0013] The present utility model is further configured such that the inner side of the protective ring has an annular boss, and the boss is fixedly connected to the fan blade. The boss enhances the structural strength of the protective ring and also increases the stability of the fan blade.

[0014] The present utility model is further configured such that one end surface of the boss is flush with the side of the protective ring close to the bottom plate, the thickness of the boss is less than the thickness of the protective ring, and the width of the fan blade is greater than the thickness of the boss and less than the thickness of the protective ring. Since the thickness of the boss is less than the thickness of the protective ring, the boss can retain the width of the fan blade while ensuring the strength of the protective ring, thereby ensuring the ability of the fan blade to draw air into the motor when rotating.

[0015] The present utility model is further configured such that the protective ring, the positioning member, and the boss are integrally formed. Since the protective ring, the positioning member, and the boss are integrally formed, the overall stability of the protective ring, the positioning member, and the boss is better.

[0016] The utility model is further configured such that the free end of the fan blade extends towards the center of the protective ring. Since the free end of the fan blade extends towards the center of the protective ring, the air extraction capacity of the fan blade is increased without occupying the axial space of the motor.

[0017] On the other hand, there is provided a motor including the heat dissipation structure of the above-mentioned permanent magnet motor.

[0018] In summary, the heat dissipation structure of the permanent magnet motor provided by the utility model has at least the following beneficial effects:

[0019] 1. When the fan blade rotates, the cooling air outside the motor is drawn into the ventilation holes. The cooling air enters the gap between the rotor magnet and the stator, and can take away the heat on the surface of the magnet and the surface of the iron core. Moreover, a part of the cooling air passes through the stator slot gap to take away the heat of the copper wire, thereby cooling the inside of the motor, effectively improving the cooling effect inside the motor, and further ensuring the working efficiency and service life of the motor.

[0020] 2. Since the fan blade is arranged inside the protective ring, the gap between the magnet and the bottom plate can be fully utilized, and the overall volume of the motor can be controlled while ensuring the heat dissipation performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0022] Figure 1 is a three-dimensional structural schematic diagram of the present utility model from the first perspective;

[0023] Figure 2 is an exploded view of the present utility model from the first perspective;

[0024] Figure 3 is an exploded view of the present utility model from the second perspective;

[0025] Figure 4 is the front view of the present utility model;

[0026] Figure 5 is Figure 4 a cross-sectional view taken along line A-A in

[0027] Figure 6 is the side view of the present utility model;

[0028] Figure 7Yes Figure 6 The sectional view taken along line B-B in the figure;

[0029] Figure 8 It is a schematic three-dimensional structure diagram of the retaining ring in the present utility model.

[0030] Reference numerals: 1, flywheel; 101, bottom plate; 102, side plate; 103, ventilation hole; 2, stator; 3, permanent magnet; 4, retaining ring; 5, fan blade; 6, positioning member; 7, boss. Specific embodiments

[0031] In order to enable those skilled in the art to better understand the technical solution of the present utility model, the present utility model will be further described in detail below in conjunction with the attached Figure 1-8 drawings and specific embodiments.

[0032] Please refer to Figure 1-8 , a heat dissipation structure of a permanent magnet motor provided in this embodiment includes a flywheel 1 and a stator 2. The flywheel 1 includes a bottom plate 101 and a side plate 102 connected to each other. The side plate 102 is annular. The left end of the side plate 102 is connected to the bottom plate 101, and the side plate 102 and the bottom plate 101 are integrally formed. A plurality of permanent magnets 3 are arranged along the circumferential direction on the inner wall of the side plate 102. The stator 2 is installed within the range enclosed by the permanent magnets 3. A plurality of ventilation holes 103 are formed in the bottom plate 101. In this embodiment, it is preferably provided with six ventilation holes 103, and the six ventilation holes 103 are evenly distributed in the circumferential direction of the bottom plate 101. A retaining ring 4 is provided inside the side plate 102. The retaining ring 4 is located between the permanent magnet 3 and the bottom plate 101, and the bottom plate 101 and the permanent magnet 3 jointly clamp the retaining ring 4. A plurality of fan blades 5 are arranged along the circumferential direction on the retaining ring 4. The fan blades 5 are evenly distributed along the circumferential direction of the retaining ring 4. One end of the fan blade 5 is fixedly connected to the retaining ring 4. The free end of the fan blade 5 extends towards the center of the retaining ring 4, and the direction in which the fan blade 5 extends towards the center of the retaining ring 4 is the length direction of the fan blade 5.

[0033] Please refer to Figure 2 , Figure 3 and Figure 7 , a plurality of positioning members 6 are provided on the right side of the retaining ring 4. The positioning members 6 are evenly distributed along the circumferential direction of the retaining ring 4. The gap between two adjacent permanent magnets 3 corresponds to one positioning member 6, and each positioning member 6 is clamped between the corresponding two permanent magnets 3. The positioning member 6 is columnar, and the cross-section of the positioning member 6 is polygonal. In this embodiment, it is preferably that the cross-section of the positioning member 6 is quadrilateral, and the side of the positioning member 6 close to the adjacent permanent magnet 3 is in contact with the side surface of the permanent magnet 3. For the specific cross-section of the positioning member 6, please refer to Figure 7 , two of the four sides of the cross-section of the positioning member 6 which is quadrilateral are respectively in contact with the corresponding permanent magnets 3; the other two sides are arc-shaped sides, and the centers of the arcs of the two arc-shaped sides coincide with the center of the bottom plate 101, and the four sides enclose a sector.

[0034] Please refer toFigure 8 , the inner side of the retaining ring 4 has an annular boss 7, and the boss 7 is fixedly connected to the fan blade 5. The end face of one end of the boss 7 close to the bottom plate 101 is flush with one side of the retaining ring 4 close to the bottom plate 101, and the thickness of the boss 7 is less than the thickness of the retaining ring 4. The width direction of the fan blade 5 is along the axial direction of the retaining ring 4, and the width of the fan blade 5 is greater than the thickness of the boss 7 and less than the thickness of the retaining ring 4. The retaining ring 4 and the boss 7 together form a stepped shape on the right side of the retaining ring 4, and one end of the fan blade 5 is connected to both the boss 7 and the retaining ring 4. The retaining ring 4, the positioning member 6 and the boss 7 are integrally formed.

[0035] By adopting the above scheme, when the motor is working, since the fan blade 5 is provided on the retaining ring 4 inside the side plate 102, the flywheel 1 drives the retaining ring 4 to rotate, thereby driving the fan blade 5 to rotate. The rotation of the fan blade 5 sucks the air outside the motor from the ventilation hole 103 of the side plate 102 into the inside of the flywheel 1, thereby cooling the inside of the motor, improving the cooling effect inside the motor, and thus ensuring the working efficiency and service life of the motor. Since the fan blade 5 is arranged inside the retaining ring 4, the gap between the magnetic steel 3 and the bottom plate 101 can be fully utilized, and the overall volume of the motor can be controlled. The positioning member 6 is clamped between adjacent magnetic steels 3, which enhances the overall relevance between the retaining ring 4 and the magnetic steel 3.

[0036] Based on the same inventive concept, the present utility model also provides a motor, including the heat dissipation structure of the above permanent magnet motor.

[0037] It should be noted that the words indicating directions in this article, such as up and down, etc., are all set in the Figure 1 direction for the convenience of description only and have no other specific meanings.

[0038] It also should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "including", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that an article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the article or device including the above elements.

[0039] In this article, specific examples are used to elaborate on the principle and implementation mode of the present utility model. The description of the above embodiments is only used to help understand the core idea of the present utility model. It should be noted that for those of ordinary skill in the art of this technology, without departing from the principle of the present utility model, several improvements and modifications can be made to the present utility model, and these improvements and modifications also fall within the protection scope of the claims of the present utility model.

Claims

1. A heat dissipation structure of a permanent magnet motor, comprising a flywheel (1) and a stator (2), wherein the flywheel (1) comprises a bottom plate (101) and a side plate (102) connected to each other, wherein the side plate (102) is annular, and a plurality of magnetic steels (3) are arranged on the inner wall of the side plate (102) along the circumferential direction, and the stator (2) is installed within the range enclosed by the magnetic steels (3), characterized in that: The bottom plate (101) is provided with a plurality of ventilation holes (103), the inner side of the side plate (102) is provided with a protective ring (4), the protective ring (4) is located between the magnetic steel (3) and the bottom plate (101), and the protective ring (4) is provided with a plurality of fan blades (5) along a circumferential direction.

2. A heat dissipation structure of a permanent magnet motor as claimed in claim 1, characterized in that: The bottom plate (101) and the magnetic steel (3) jointly clamp the protective ring (4).

3. A heat dissipation structure of a permanent magnet motor as claimed in claim 2, characterized in that: A plurality of positioning members (6) are provided on one side of the protective ring (4), and each positioning member (6) is clamped between two corresponding magnetic steels (3).

4. A heat dissipation structure of a permanent magnet motor as claimed in claim 3, characterized in that: The positioning member (6) is columnar, and the cross section of the positioning member (6) is polygonal.

5. A heat dissipation structure of a permanent magnet motor as claimed in claim 4, characterized in that: The cross section of the positioning member (6) is a quadrilateral, and the side of the positioning member (6) close to the adjacent magnetic steel (3) is in contact with the side surface of the magnetic steel (3).

6. A heat dissipation structure of a permanent magnet motor as claimed in any one of claims 3 to 5, characterized in that: The inner side of the guard ring (4) is provided with an annular boss (7), and the boss (7) is fixedly connected to the fan blade (5).

7. A heat dissipation structure of a permanent magnet motor as claimed in claim 6, characterized in that: One end surface of the boss (7) is flush with a side of the guard ring (4) close to the bottom plate (101); the thickness of the boss (7) is smaller than the thickness of the guard ring (4); the width of the fan blade (5) is larger than the thickness of the boss (7) and smaller than the thickness of the guard ring (4).

8. A heat dissipation structure of a permanent magnet motor as claimed in claim 7, characterized in that: The protective ring (4), the positioning member (6) and the boss (7) are integrally formed.

9. A heat dissipation structure of a permanent magnet motor as claimed in claim 1, characterized in that: The free end of the fan blade (5) extends toward the center of the guard ring (4).

10. A motor, characterized in that: A heat dissipation structure of a permanent magnet motor comprising the heat dissipation structure of any one of claims 1 to 9.

Images