External rotor motor with high heat dissipation efficiency

Abstract

The utility model discloses a high-efficiency heat-dissipation external rotor motor, and aims to provide a high-efficiency heat-dissipation external rotor motor which can discharge heat generated by a motor winding and magnetic steel out of the motor in the working process of the external rotor motor to play a role in continuous and rapid heat dissipation so as to improve the operation reliability of the motor and prolong the service life of the motor. The motor comprises a motor base; the stator is fixed on the motor base; the outer rotor is rotationally arranged on the motor base through a middle shaft, and the outer rotor comprises a rotor shell; the annular heat dissipation piece is fixed to the end, facing the motor base, of the rotor shell, an annular air gap is formed between the outer rotor and the stator, and an end face gap communicated with the annular air gap is formed between the outer rotor and the motor base; the annular heat dissipation piece comprises a plurality of centrifugal blades which are sequentially distributed in the circumferential direction around the center shaft, a centrifugal air channel is formed between any two adjacent centrifugal blades, and an air inlet of the centrifugal air channel communicates with the end face gap.

Description

TECHNICAL FIELD

[0001] The utility model relates to an outer rotor motor, in particular to an outer rotor motor of high -efficient heat dissipation. BACKGROUND

[0002] The outer rotor motor generally includes motor base, stator and outer rotor, the stator is fixed on the motor base, and the outer rotor is rotatably arranged on the base through the middle shaft, and the outer rotor includes rotor shell. During the working process of the outer rotor motor, the heat generated by the motor winding and the magnetic steel, and the overall mechanism of the outer rotor motor is relatively compact, and the heat dissipation effect is poor, which leads to the outer rotor motor in the running process in the overheat state for a long time, affects the motor operation reliability and service life. UTILITY MODEL CONTENTS

[0003] The utility model discloses a kind of outer rotor motors of high -efficient heat dissipation, which can discharge the heat generated by motor winding and magnetic steel to motor outside during the working process of outer rotor motor, play the role of sustained, fast heat dissipation, to improve motor operation reliability and service life.

[0004] The technical scheme of the utility model is as follows:

[0005] A kind of outer rotor motor of high -efficient heat dissipation, comprising:

[0006] Motor base;

[0007] Stator, fixed on the motor base;

[0008] Outer rotor, rotatably arranged on the motor base through the middle shaft, and the outer rotor includes rotor shell;

[0009] Annular heat dissipation part, fixed on the end of rotor shell towards motor base, there is annular air gap between outer rotor and stator, and end face gap is provided between outer rotor and motor base and communicated with annular air gap;Annular heat dissipation part includes a plurality of centrifugal blades distributed sequentially in circumferential direction around the middle shaft, and centrifugal wind channel is formed between any two adjacent distributed centrifugal blades, and the air inlet of centrifugal wind channel is communicated with end face gap. The outer rotor of high -efficient heat dissipation of the scheme in working process, outer rotor will drive annular heat dissipation part synchronous rotation, centrifugal blade and centrifugal wind channel in annular heat dissipation part utilize centrifugal force, realize radial air outlet, and form continuous airflow in annular air gap, end face gap and centrifugal wind channel, to discharge the heat generated by motor winding and magnetic steel to motor outside, play the role of sustained, fast heat dissipation, improve motor operation reliability and service life.

[0010] As preferred, the annular heat dissipation member comprises two annular plates parallel to each other, and the centrifugal blades are arranged between the two annular plates and connect the two annular plates into one. In this way, the centrifugal air duct forms a continuous air duct with both ends open, which is beneficial to the centrifugal air duct to utilize the centrifugal force, improve the radial air outlet, and increase the continuous airflow formed in the annular air gap, the end face gap and the centrifugal air duct.

[0011] As preferred, the centrifugal blades are in the shape of a circular arc, and the corresponding centrifugal air duct is also in the shape of a circular arc. In this way, when the outer rotor drives the annular heat dissipation member to rotate synchronously, it is beneficial to reduce the flow resistance of the airflow in the centrifugal air duct, thereby improving the radial air outlet and increasing the continuous airflow formed in the annular air gap, the end face gap and the centrifugal air duct.

[0012] As preferred, the annular heat dissipation member extends outward from the outer wall of the rotor shell. In this way, the arrangement of the annular heat dissipation member will not affect the structure of the motor stator and the outer rotor, and it is convenient for actual processing and manufacturing.

[0013] As preferred, it also includes a mounting member, and the annular heat dissipation member is fixed to the rotor shell through the mounting member. The annular heat dissipation member and the rotor shell are two independently manufactured components, and then the annular heat dissipation member is fixed to the rotor shell through the mounting member. In this way, it is convenient for actual processing and manufacturing of the annular heat dissipation member and the outer rotor.

[0014] As preferred, the mounting member includes a sleeve body sleeved on the rotor shell, the sleeve body is connected with the rotor shell through welding, one end of the sleeve body towards the motor base is provided with a circle of mounting disc extending outward, and the annular heat dissipation member is fixed on the mounting disc through bolts or welding. In this way, the mounting of the mounting member and the annular heat dissipation member can be facilitated.

[0015] As preferred, an annular labyrinth dustproof structure is arranged between the annular heat dissipation member and the motor base. In this way, the annular labyrinth dustproof structure can play a role in dustproof and waterproof.

[0016] As preferred, the annular labyrinth dustproof structure comprises an annular recess and an annular protrusion, the annular recess is arranged on one of the annular heat dissipation member and the motor base, the annular protrusion is arranged on the other one of the annular heat dissipation member and the motor base, and the annular protrusion extends into the annular recess. In this way, the annular labyrinth dustproof structure can play a role in dustproof and waterproof.

[0017] As preferred, the motor base is provided with a circle of annular mounting plate extending outward near one end of the outer rotor, and the annular mounting plate is provided with a plurality of mounting holes. In this way, the annular mounting plate can be used to install the high-efficiency heat dissipation outer rotor motor of the present scheme, and it is convenient for the installation and application of the outer rotor motor.

[0018] As preferred, the middle part of the motor base is provided with an installation shaft sleeve extending outward, the stator is sleeved outside the installation shaft sleeve, and the middle shaft is rotatably installed in the installation shaft sleeve through a bearing.

[0019] The utility model discloses a beneficial effect is: can export the heat generated by motor winding and magnetic steel to the motor in the working process of outer rotor motor, plays the role of sustained, fast heat dissipation, thereby improves motor operation reliability and service life. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a kind of section structure schematic diagram of the high-efficiency heat-dissipation outer rotor motor of the utility model.

[0021] Figure 2 It is Figure 1 It is a kind of partial close-up view of middle A.

[0022] Figure 3 It is a kind of three-dimensional structure schematic diagram of the high-efficiency heat-dissipation outer rotor motor of the utility model.

[0023] Figure 4 It is a kind of section structure schematic diagram of the annular heat-dissipation piece of the high-efficiency heat-dissipation outer rotor motor of the utility model.

[0024] In the drawing:

[0025] Motor base 1, installation shaft sleeve 1.1, annular installation plate 1.2, installation hole 1.3;

[0026] Stator 2;

[0027] Outer rotor 3, rotor shell 3.1;

[0028] Middle shaft 4;

[0029] Annular heat-dissipation piece 5, centrifugal blade 5.0, centrifugal air duct 5.1;

[0030] Mounting piece 6, sleeve body 6.1, mounting disc 6.2;

[0031] Annular air gap 7;

[0032] End face gap 8;

[0033] Annular labyrinth dustproof structure 9, annular recess 9.1, annular protrusion 9.2;

[0034] Front insulating cover 10;

[0035] Insulating body 11;

[0036] Insulating accommodating cavity 12. DETAILED DESCRIPTION

[0037] Specific embodiment one, asFigures 1-4 As shown, a high-efficiency heat dissipation external rotor motor includes a motor base 1, a stator 2, an external rotor 3, and an annular heat sink 5.

[0038] The stator 2 is fixed to the motor base 1. The outer rotor 3 is rotatably mounted on the motor base 1 via the central shaft 4. The outer rotor 3 includes a rotor housing 3.1. There is an annular air gap 7 between the outer rotor 3 and the stator 2. There is an end face gap 8 between the outer rotor 3 and the motor base 1, and the end face gap 8 communicates with the annular air gap 7.

[0039] An annular heat sink 5 is fixed to one end of the rotor housing 3.1 facing the motor base 1. The annular heat sink 5 includes several centrifugal blades 5.0 arranged circumferentially around the central axis 4. A centrifugal air duct 5.1 is formed between any two adjacent centrifugal blades 5.0. The air inlet of the centrifugal air duct 5.1 is connected to the end face gap 8.

[0040] In this embodiment, an efficient heat dissipation external rotor motor operates by having the external rotor 3 drive the annular heat sink 5 to rotate synchronously. The centrifugal blades 5.0 and centrifugal air duct 5.1 inside the annular heat sink 5 utilize centrifugal force to achieve radial airflow, forming a continuous airflow within the annular air gap 7, end face gap 8, and centrifugal air duct 5.1. This dissipates the heat generated by the motor windings and magnets to the outside of the motor, providing continuous and rapid heat dissipation and improving the reliability and service life of the motor.

[0041] Specific embodiment two, such as Figures 1-4 As shown, a high-efficiency heat dissipation external rotor motor includes a motor base 1, a stator 2, an external rotor 3, and an annular heat sink 5.

[0042] The stator 2 is fixed to the motor base 1. The outer rotor 3 is rotatably mounted on the motor base 1 via the central shaft 4. The outer rotor 3 includes a rotor housing 3.1. There is an annular air gap 7 between the outer rotor 3 and the stator 2. There is an end face gap 8 between the outer rotor 3 and the motor base 1, and the end face gap 8 communicates with the annular air gap 7.

[0043] An annular heat sink 5 is fixed to one end of the rotor housing 3.1 facing the motor base 1. The annular heat sink 5 includes several centrifugal blades 5.0 arranged circumferentially around the central axis 4. A centrifugal air duct 5.1 is formed between any two adjacent centrifugal blades 5.0. The air inlet of the centrifugal air duct 5.1 is connected to the end face gap 8.

[0044] In this embodiment, the annular heat sink 5 extends outward from the outer wall of the rotor housing 3.1. Thus, the arrangement of the annular heat sink 5 does not affect the structure of the outer rotor motor stator 2 and the outer rotor 3, facilitating actual manufacturing.

[0045] In one embodiment of this example, such as Figure 1 , Figure 3As shown in the drawings, the outer rotor motor with high heat dissipation efficiency further comprises a mounting member 6. The annular heat dissipation member 5 and the rotor housing 3.1 are two independently manufactured components. The annular heat dissipation member 5 is fixed on the rotor housing 3.1 through the mounting member 6. The annular heat dissipation member 5 and the rotor housing 3.1 are two independently manufactured components, and then the annular heat dissipation member 5 is fixed on the rotor housing 3.1 through the mounting member 6. In this way, the actual processing and manufacturing of the annular heat dissipation member 5 and the outer rotor 3 are facilitated.

[0046] Specifically, the mounting member 6 comprises a sleeve body 6.1 which is sleeved on the rotor housing 3.1. The sleeve body 6.1 is connected with the rotor housing 3.1 by welding. One end of the sleeve body 6.1 towards the motor base 1 is provided with a mounting disc 6.2 which extends outward. The annular heat dissipation member 5 is fixed on the mounting disc 6.2 by bolts, rivets or welding. In this way, the mounting of the mounting member 6 and the annular heat dissipation member 5 is facilitated, and the annular heat dissipation member 5 is stably and reliably mounted.

[0047] In another embodiment of the present embodiment, the annular heat dissipation member 5 and the rotor housing 3.1 are two independently manufactured components. The annular heat dissipation member 5 is directly fixed on the rotor housing 3.1 by bolts, rivets or welding (not shown in the drawings). In this way, the actual processing and manufacturing of the annular heat dissipation member 5 and the outer rotor 3 are facilitated; and the mounting member 6 can be omitted, thereby reducing the manufacturing cost.

[0048] In a third embodiment of the present embodiment, the annular heat dissipation member 5 and the rotor housing 3.1 are integrally formed, i.e., the annular heat dissipation member 5 and the rotor housing 3.1 are integrally manufactured (not shown in the drawings). In this way, when the outer rotor motor is assembled, the step of separately mounting the annular heat dissipation member 5 can be omitted.

[0049] In the working process of the outer rotor motor with high heat dissipation efficiency of the present embodiment, the outer rotor 3 drives the annular heat dissipation member 5 to rotate synchronously. The centrifugal blades 5.0 and the centrifugal air duct 5.1 in the annular heat dissipation member 5 utilize centrifugal force to realize radial air outlet, and continuous airflow is formed in the annular air gap 7, the end face gap 8 and the centrifugal air duct 5.1, thereby discharging the heat generated by the motor windings and the magnetic steel to the outside of the motor, playing a role of continuous and rapid heat dissipation, improving the operation reliability and service life of the motor.

[0050] Specifically, as shown in the drawings, Figure 1 , Figure 2 , Figure 3 the middle part of the motor base 1 is provided with an installation shaft sleeve 1.1 which extends outward. The motor base 1 and the installation shaft sleeve 1.1 are integrally formed. The stator 2 is sleeved outside the installation shaft sleeve 1.1. The middle shaft 4 is rotatably installed in the installation shaft sleeve 1.1 through a bearing.

[0051] In one example, as shown in the drawings, Figure 1As shown, the inner hole of the mounting sleeve 1.1 is provided with a step face at each end, one end of the shaft 4 is fixed on the rotor shell 3.1, the rotor shell 3.1 is provided with a boss at the end of the shaft 4, the shaft 4 is provided with an annular clamping groove, and a clamping ring is clamped in the annular clamping groove. The shaft 4 is rotatably mounted in the mounting sleeve 1.1 through two bearings, and the two bearings are located between the boss and the clamping ring. One of the bearings is arranged at one end of the inner hole of the mounting sleeve 1.1, and the bearing is limited between the boss and the step face; the other bearing is arranged at the other end of the inner hole of the mounting sleeve 1.1, and one end of the bearing is limited between the step face and the clamping ring.

[0052] Further, as shown in Figure 1 、 Figure 3 , the motor base 1 is provided with a ring-shaped mounting plate 1.2 extending outward at one end close to the outer rotor 3. The ring-shaped mounting plate 1.2 is provided with a plurality of mounting holes 1.3. In this embodiment, the mounting holes 1.3 are threaded mounting holes 1.3. In this way, the ring-shaped mounting plate 1.2 can be used to mount the high-efficiency heat dissipation outer rotor motor of the present application, facilitating the installation and application of the outer rotor motor.

[0053] Further, as shown in Figure 1 、 Figure 4 , the annular heat dissipation member 5 includes two parallel annular plates, and the centrifugal blades 5.0 are arranged between the two annular plates and connect the two annular plates into one. In this way, the centrifugal air duct 5.1 forms a continuous air duct with both ends open, which is conducive to the centrifugal air duct 5.1 utilizing centrifugal force to improve radial air outflow and increase the continuous airflow formed in the annular air gap 7, the end face gap 8 and the centrifugal air duct 5.1.

[0054] In this embodiment, the annular heat dissipation member 5 is coaxially distributed with the shaft 4. In this way, the stability of the rotation of the outer rotor 3 and the annular heat dissipation member 5 can be improved during the operation of the outer rotor motor, and the shaking of the outer rotor 3 can be avoided.

[0055] In one embodiment of the present application, as shown in Figure 4 , the centrifugal blades 5.0 are arc-shaped, and the corresponding centrifugal air duct 5.1 is also arc-shaped. In this way, the rotation of the annular heat dissipation member 5 driven by the outer rotor 3 is conducive to reducing the flow resistance of the airflow in the centrifugal air duct 5.1, thereby improving the radial air outflow and increasing the continuous airflow formed in the annular air gap 7, the end face gap 8 and the centrifugal air duct 5.1.

[0056] In another embodiment of the present application, the centrifugal blades 5.0 extend radially along the shaft 4, and the corresponding centrifugal air duct 5.1 also extends radially along the shaft 4 (not shown in the figure). In this way, the actual processing and manufacturing of the annular heat dissipation member 5 are facilitated.

[0057] Further, as shown in Figure 1 ,Figure 2 As shown, an annular heat sink 5 and the motor base 1 are provided with an annular labyrinth dustproof structure 9. In this way, the annular labyrinth dustproof structure 9 can play a role in preventing dust and water.

[0058] The annular labyrinth dustproof structure 9 includes an annular recess 9.1 and an annular protrusion 9.2. The annular recess 9.1 is located on one of the annular heat sink 5 and the motor base 1, and the annular protrusion 9.2 is located on the other of the annular heat sink 5 and the motor base 1. The annular protrusion 9.2 extends into the annular recess 9.1. In this way, the annular labyrinth dustproof structure 9 can serve the functions of dustproofing and waterproofing.

[0059] In one example, such as Figure 2 As shown, the annular recess 9.1 is a groove structure and is disposed on the annular heat sink 5. The annular protrusion 9.2 is disposed on the side of the motor base 1 facing the annular heat sink 5, and the annular protrusion 9.2 and the motor base 1 are integrally formed. The annular protrusion 9.2 extends into the annular recess 9.1. In this example, there are two annular recesses 9.1, and there are also two corresponding annular protrusions 9.2, with the annular protrusions 9.2 extending into the corresponding annular recesses 9.1. Specifically, the annular plate of the annular heat sink 5 facing the motor base 1 has a recessed annular step inside, which constitutes one of the annular recesses 9.1; the annular plate of the annular heat sink 5 facing the motor base 1 has an annular boss, and the annular boss has an annular groove with its opening facing downward towards the motor base 1, which constitutes one of the annular recesses 9.1.

[0060] In another example, the annular recess 9.1 is a groove structure, and the annular recess 9.1 is located on the side of the motor base 1 facing the annular heat sink 5; the annular protrusion 9.2 is located on the side of the annular heat sink 5 facing the motor base 1, and the annular protrusion 9.2 and the annular heat sink 5 are integrally formed. In this example, there are one or more annular recesses 9.1, and there are also one or more corresponding annular protrusions 9.2, with the annular protrusions 9.2 extending into the corresponding annular recess 9.1.

[0061] In the third example, the annular recess 9.1 is a groove structure, and there are multiple annular recesses 9.1. A portion of the annular recesses 9.1 are located on the annular heat sink 5, and another portion is located on the side of the motor base 1 facing the annular heat sink 5. Correspondingly, there are also multiple annular protrusions 9.2, a portion of which are located on the annular heat sink 5, and another portion is located on the side of the motor base 1 facing the annular heat sink 5. The annular protrusions 9.2 extend into the corresponding annular recesses 9.1.

[0062] In this specific embodiment, the remaining structures are the same as in the specific embodiment, except that...

[0063] As shown in Figure 1 、 Figure 2 A high-efficiency heat dissipation outer rotor motor further comprises a control board, a front insulating cover 10 and an insulating body 11. A fixed gap is provided between the stator 2 and the motor base 1, and the fixed gap is communicated with the end face gap 8. The front insulating cover 10 is connected with the core of the stator 2 through bolts. The insulating body 11 is connected with the front insulating cover 10 through bolts or buckles. An insulating accommodation cavity 12 is formed between the front insulating cover 10 and the insulating body 11. The control board is arranged in the insulating accommodation cavity 12. The front insulating cover 10 and the insulating body 11 are located in the fixed gap and the end face gap 8, or the front insulating cover 10 and the insulating body 11 are only located in the fixed gap. During the operation of the motor, the chips of the control board will generate heat, which affects the temperature of the insulating accommodation cavity 12, resulting in poor heat dissipation effect of the control board, affecting the operation reliability and service life of the chips of the control board.

[0064] The high-efficiency heat dissipation outer rotor motor of the embodiment can effectively solve this problem. Specifically, during the operation of the high-efficiency heat dissipation outer rotor motor of the embodiment, the outer rotor 3 will drive the annular heat dissipation member 5 to rotate synchronously, the centrifugal blades 5.0 and the centrifugal air duct 5.1 in the annular heat dissipation member 5 utilize the centrifugal force to realize radial air outlet, and continuous airflow is formed in the annular air gap 7, the end face gap 8, the fixed gap and the centrifugal air duct 5.1. In this way, on the one hand, the heat generated by the motor winding and the magnetic steel can be discharged to the outside of the motor, playing a role of continuous and rapid heat dissipation, improving the operation reliability and service life of the motor; on the other hand, the heat generated by the chips of the control board in the insulating accommodation cavity 12 can be discharged to the outside of the motor, playing a role of continuous and rapid heat dissipation, reducing the temperature of the insulating accommodation cavity 12, improving the heat dissipation effect of the control board, and avoiding affecting the operation reliability and service life of the chips of the control board.

[0065] The above is only a preferred embodiment of the present application, and does not limit the present application in any way. Any simple modification, change and equivalent transformation of the above embodiment according to the technical essence of the present application still belongs to the protection scope of the technical solution of the present application.

Claims

1. A high-efficiency heat dissipation external rotor motor, characterized in that, include: Motor base; The stator is fixed to the motor base; The outer rotor is rotatably mounted on the motor base via a central shaft, and the outer rotor includes a rotor housing. An annular heat sink is fixed on the rotor housing at one end facing the motor base. There is an annular air gap between the outer rotor and the stator, and an end face gap communicating with the annular air gap is provided between the outer rotor and the motor base. The annular heat sink includes several centrifugal blades arranged circumferentially around the central axis. A centrifugal air duct is formed between any two adjacent centrifugal blades, and the air inlet of the centrifugal air duct is communicating with the end face gap.

2. The high-efficiency heat dissipation external rotor motor according to claim 1, characterized in that, The annular heat sink includes two parallel annular plates, with centrifugal blades positioned between the two annular plates and connecting them into one unit.

3. The high-efficiency heat dissipation external rotor motor according to claim 1, characterized in that, The centrifugal blades are arc-shaped, and the corresponding centrifugal air ducts are also arc-shaped.

4. A high-efficiency heat-dissipating external rotor motor according to claim 1, 2, or 3, characterized in that, The annular heat sink extends outward from the outer wall of the rotor housing.

5. A high-efficiency heat-dissipating external rotor motor according to claim 1, 2, or 3, characterized in that, It also includes mounting components, with the annular heat sink fixed to the rotor housing via the mounting components.

6. The high-efficiency heat dissipation external rotor motor according to claim 5, characterized in that, The mounting component includes a sleeve that is fitted onto the rotor housing. The sleeve is connected to the rotor housing by welding. A mounting plate extending outward is provided on one end of the sleeve facing the motor base. The annular heat sink is fixed to the mounting plate by bolts or welding.

7. A high-efficiency heat-dissipating external rotor motor according to claim 1, 2, or 3, characterized in that, An annular labyrinth dustproof structure is provided between the annular heat sink and the motor base.

8. The high-efficiency heat dissipation external rotor motor according to claim 7, characterized in that, The annular labyrinth dustproof structure includes an annular recess and an annular protrusion. The annular recess is disposed on one of the annular heat sink and the motor base, and the annular protrusion is disposed on the other of the annular heat sink and the motor base. The annular protrusion extends into the annular recess.

9. A high-efficiency heat-dissipating external rotor motor according to claim 1, 2, or 3, characterized in that, The motor base has an annular mounting plate extending outward from one end near the outer rotor, and the annular mounting plate has several mounting holes.

10. A high-efficiency heat-dissipating external rotor motor according to claim 1, 2, or 3, characterized in that, The motor base has an outwardly extending mounting sleeve in the middle, the stator is sleeved outside the mounting sleeve, and the central shaft rotates inside the mounting sleeve through a bearing.

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