CN210927419U - High-heat-dissipation permanent magnet brushless motor with internal magnetism-gathering characteristic - Google Patents
High-heat-dissipation permanent magnet brushless motor with internal magnetism-gathering characteristic Download PDFInfo
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- CN210927419U CN210927419U CN201922345041.5U CN201922345041U CN210927419U CN 210927419 U CN210927419 U CN 210927419U CN 201922345041 U CN201922345041 U CN 201922345041U CN 210927419 U CN210927419 U CN 210927419U
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Abstract
The utility model discloses a high heat dissipation permanent magnet brushless motor who possesses interior magnetism nature, including stator module, armature assembly, rotor subassembly and radiator unit, stator module includes base and base bearing, and armature assembly includes armature skeleton and annular winding, and the rotor subassembly includes pivot, shell and annular permanent magnet, and the annular permanent magnet includes a plurality of tile magnet A and a plurality of tile magnet B; in any two adjacent tile magnets A, the magnetizing direction of one tile magnet A is that the inner arc surface points to the outer arc surface, and the magnetizing direction of the other tile magnet A is that the outer arc surface points to the inner arc surface; the magnetizing direction of each tile magnet B is that the connecting surface C points to the connecting surface D, the connecting surface C is connected with the tile magnet A of which the magnetizing direction is the inner arc surface points to the outer arc surface, and the connecting surface D is connected with the tile magnet A of which the magnetizing direction is the outer arc surface points to the inner arc surface. The utility model discloses can provide great air gap magnetic density, make brushless motor possess high output efficiency and power density.
Description
Technical Field
The utility model belongs to the permanent magnetism field, more specifically relates to a permanent magnet brushless motor.
Background
With the development of power electronic technology, brushless motors based on electronic commutation are widely used in various aspects of social life, and especially, permanent magnet brushless motors using ring-shaped permanent magnets as magnetic sources are favored by engineers in the engineering application field due to their advantages of high output efficiency, long service life, various structural forms, and the like. With the continuous advance of new technologies such as intelligent manufacturing and 5G application, higher requirements are put forward in various fields for the performance requirements of efficiency, volume, service life, noise and the like of the permanent magnet brushless motor, and therefore, novel motor design is at the forefront.
Specifically, in the field of conventional micro special motors (in the industry, the rated power is within 750W or the diameter is less than 160mm), a brushless motor with an output efficiency of 80% can be considered as a well-designed brushless motor, the proportion of the brushless motor with an output efficiency of 85% -90% is small, and the motor diameter can be achieved only under the condition of a relatively large diameter. Meanwhile, for brushless motors with diameters smaller than 42mm and even smaller, it seems to be a difficult technical obstacle to obtain an output efficiency of 90% or more.
In order to improve the efficiency of the motor, besides using high-performance rare earth permanent magnet materials, permanent magnet motors with a flux concentration effect are usually designed to reduce the flux leakage phenomenon so as to achieve the purpose of improving the output efficiency of the motor. At present, in the aspect of improving the magnetism gathering effect of the brushless motor, the magnetic conduction magnetic yoke with the required shape is mostly arranged in a magnetic circuit, magnetic lines of force are guided to enter an expected 'path', the magnetic conduction magnetic yoke structure is not only complex in structure, but also has higher requirements on the theoretical level of designers, the magnetic conduction magnetic yoke structure is not beneficial to wide popularization and use, and the magnetic conduction magnetic yoke also occupies a certain space and is not beneficial to miniaturization.
SUMMERY OF THE UTILITY MODEL
To the above defect of prior art or improve the demand, the utility model provides a high heat dissipation permanent magnet brushless motor who possess interior magnetism nature, its simple structure need not the magnetic conduction yoke, still has higher output efficiency in the less condition of appearance size.
In order to realize the above object, according to the utility model discloses, a high heat dissipation permanent magnet brushless motor who possess interior magnetism nature is provided, a serial communication port, including stator module, armature assembly, rotor subassembly and radiator unit, stator module includes the base and sets up the base bearing on this base, armature assembly includes armature skeleton and annular winding, armature skeleton fixed mounting is on this base, annular winding installs on this armature skeleton, the rotor subassembly includes pivot, shell and annular permanent magnet, the pivot is installed on this base through this base bearing, the shell is fixed to wear the dress in this pivot, the fixed dress of annular permanent magnet is on the inner wall of this shell and with the coaxial setting of this pivot, annular permanent magnet encloses this annular winding, wherein:
the heat dissipation assembly comprises a heat dissipation silica gel ring and a plurality of heat dissipation fins which are uniformly distributed on the inner wall of the heat dissipation silica gel ring in the circumferential direction, the heat dissipation silica gel ring is supported by the base and is in contact with the inner wall of the annular winding, a first ventilation hole communicated with the inner cavity of the heat dissipation silica gel ring is formed in the base, and a second ventilation hole communicated with the inner cavity of the heat dissipation silica gel ring is formed in the shell;
the annular permanent magnet comprises a plurality of tile magnets A and a plurality of tile magnets B which are alternately arranged and fixedly connected together to form the annular permanent magnet with an inner cylindrical surface and an outer cylindrical surface, each tile magnet A and each tile magnet B are formed by magnetizing parallel magnetic fields, and the radian of each tile magnet B is smaller than that of each tile magnet A;
for any two adjacent tile magnets A, the magnetizing direction of one tile magnet A is that the inner arc surface points to the outer arc surface, and the magnetizing direction of the other tile magnet A is that the outer arc surface points to the inner arc surface;
for every tile magnet B, it has connection face C and connection face D, and its direction of magnetizing is the connection face D of connecting face C point to, and connection face C is connected for the tile magnet A of the directional extrados of extrados with the direction of magnetizing, connection face D is connected for the tile magnet A of the directional extrados of extrados with the direction of magnetizing.
Preferably, for each tile magnet a, the projections of the inner arc surface and the outer arc surface of the tile magnet a on a plane perpendicular to the annular permanent magnet are an arc E and an arc F, respectively, and the direction of the parallel magnetic field for magnetizing the tile magnet a is parallel to a connecting line of the midpoints of the arc E and the arc F.
Preferably, for each tile magnet B, the projections of the connecting surface C and the connecting surface D on a plane perpendicular to the annular permanent magnet are a line segment G and a line segment H, respectively, and the direction of the parallel magnetic field for magnetizing the tile magnet B is parallel to the connecting line of the midpoints of the line segment G and the line segment H.
Preferably, the stator assembly further comprises a pre-tightening spring, one end of which presses on the main bearing and the other end presses on a step inside the base.
Preferably, the rotating shaft has an annular groove, the rotor assembly further comprises a shaft retainer ring disposed on the annular groove, the main bearing is located between the preload spring and the shaft retainer ring is in contact with the main bearing.
Preferably, the arc of each tile magnet B is 40% to 60% of the arc of each tile magnet a, respectively.
Preferably, the housing is made of aluminum alloy or plastic.
Preferably, the annular permanent magnet is pasted on the inner wall of the shell through an adhesive, and the armature framework is pasted on the base through the adhesive.
Preferably, an auxiliary bearing is further arranged on the base, and the rotating shaft penetrates through the auxiliary bearing.
Preferably, the inner wall of one end of the annular winding is fixedly sleeved on the armature framework.
Generally, through the utility model discloses above technical scheme who conceives compares with prior art, can gain following beneficial effect:
1) the utility model provides a high heat dissipation permanent magnet brushless motor who possesses internal magnetism nature of polymerization does not have the iron core loss, under the prerequisite of having cancelled the magnetic conduction yoke, still can provide great air gap magnetic density, makes the motor possess high output efficiency and power density.
2) The utility model provides a high heat dissipation permanent magnet brushless motor who possesses cohesion magnetism characteristic, motor structure is simple and the inside idle space of motor is more, can fuse with the product degree of depth under the different applied scenes, can reach the purpose that makes terminal product compact structure, is fit for the needs (but not limited to small-size structure) of small-size structure product.
Drawings
Fig. 1 is a schematic cross-sectional view of the present invention;
fig. 2 is a schematic view of one of the tile magnets a according to the present invention magnetized in a parallel magnetic field;
fig. 3 is a schematic view of one of the tile magnets B according to the present invention magnetized in a parallel magnetic field;
FIG. 4 is a schematic view of the arrangement and respective magnetizing directions of tile magnets of the ring permanent magnet according to the present invention;
FIG. 5 is a schematic diagram of the distribution of magnetic lines of force of the ring-shaped permanent magnet according to the present invention;
fig. 6 is a schematic structural view of the heat dissipation assembly of the present invention;
fig. 7 is an exploded view of the heat dissipating assembly of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. Furthermore, the technical features mentioned in the embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.
As shown in fig. 1 to 7, a highly heat-dissipating permanent magnet brushless motor with internal magnetism includes a stator assembly 1, an armature assembly 2, a rotor assembly 3 and a heat dissipation assembly 16, where the stator assembly 1 includes a base 11 and a main bearing 12 disposed on the base 11, the armature assembly 2 includes an armature framework 21 and a ring winding 22, the armature framework 21 is fixedly mounted on the base 11, the ring winding 22 is mounted on the armature framework 21, the ring winding 22 is connected with a lead 23 and can be connected with an external power supply, the rotor assembly 3 includes a rotating shaft 31, a housing 32 and a ring permanent magnet 33, the rotating shaft 31 is mounted on the base 11 through the main bearing 12, the housing 32 is fixedly penetrated on the rotating shaft 31, the ring permanent magnet 33 is fixedly sleeved on an inner wall of the housing 32 and is disposed coaxially with the rotating shaft 31, the annular permanent magnet 33 encloses the annular winding 22 and both are arranged coaxially, wherein:
the heat dissipation assembly 16 comprises a heat dissipation silica gel ring 161 and a plurality of heat dissipation fins 162 uniformly arranged on the inner wall of the heat dissipation silica gel ring 161 in the circumferential direction, the heat dissipation silica gel ring 161 is supported by the base 11 and is in contact with the inner wall of the annular winding 22, each heat dissipation fin 162 is preferably vertically arranged, a first ventilation hole communicated with the inner cavity of the heat dissipation silica gel ring 161 is arranged on the base 11, and a second ventilation hole communicated with the inner cavity of the heat dissipation silica gel ring 161 is arranged on the housing 32; in order to facilitate assembly in process, the heat dissipation silica gel ring 161 is arranged to be of a multilayer structure and provided with an inner layer and an outer layer, the inner layer is divided into two halves, each half is connected with the heat dissipation fin 162, the two halves are spliced together, heat dissipation silica gel grease or a silica gel plate can be filled in a gap between the inner layer of the heat dissipation silica gel ring 161 and the annular winding 22 to form the outer layer of the heat dissipation silica gel ring 161, heat generated by the annular winding 22 is rapidly transmitted to the heat dissipation fins 162, in order to better dissipate the heat, the first ventilation holes and the second ventilation holes can circulate the heat, the heat dissipation condition of the brushless motor is improved, the brushless motor can continuously and reliably run under the condition of large load current, and the application field of the brushless motor is expanded.
The annular permanent magnet 33 comprises a plurality of tile magnets a331 and a plurality of tile magnets B332 which are alternately arranged and fixedly connected together to form the annular permanent magnet 33 with an inner cylindrical surface and an outer cylindrical surface, each tile magnet a331 and each tile magnet B332 are magnetized by a parallel magnetic field (refer to arrows in fig. 2 and 3, the arrows indicate magnetizing directions, namely directions of the parallel magnetic fields), and the radian β of each tile magnet B3321Are all less than the radian β of each tile magnet A3312This allows tile magnet A331 to provide more magnetic source and the air gap flux density of the machine to be as large as possible, preferably with the arc β of each tile magnet B3321Respectively for each tile magnet A331 arc β240% -60% of the total weight of the motor, the percentage defines the radian proportional relationship of the tile magnet A and the tile magnet B, a basis is provided for the rapid design of the tile magnet A and the tile magnet B, meanwhile, the optimal proportional relationship can be found within the percentage range, so that the inner magnetic cohesion effect in the air gap area of the motor is optimal, the optimal value depends on the factors such as the size and the material characteristics of the annular permanent magnet 33, and the like, and is determined according to the actual situation so as to achieve the optimal inner magnetic cohesion effect.
For any two adjacent tile magnets A331, the magnetizing direction of one tile magnet A331 is that the inner arc surface points to the outer arc surface, and the magnetizing direction of the other tile magnet A331 is that the outer arc surface points to the inner arc surface, so that the design ensures that the annular permanent magnet 33 spliced into a whole can generate the effect of alternately arranging the magnetic poles N and the magnetic poles S, and the brushless motor can normally run.
For each tile magnet B332, the tile magnet B has a connecting surface C and a connecting surface D, the magnetizing direction of the tile magnet B is that the connecting surface C points to the connecting surface D, the connecting surface C is connected to the tile magnet a331 whose magnetizing direction is that the intrados points to the extrados, and the connecting surface D is connected to the tile magnet a331 whose magnetizing direction is that the extrados points to the intrados.
Through the structural design, after the tile magnet B332 and the tile magnet A331 are spliced into the integral annular permanent magnet, the magnetic field cohesion effect can be formed.
Further, for each tile magnet a331, projections of an inner arc surface and an outer arc surface of the tile magnet a331 on a plane perpendicular to the annular permanent magnet 33 are an arc E3311 and an arc F3312, respectively, and a direction of a parallel magnetic field for magnetizing the tile magnet a331 is parallel to a connecting line (see an arrow in fig. 2) of midpoints of the arc E3311 and the arc F3312, so that the air gap flux density of the annular permanent magnet 33 spliced into a whole is larger.
Further, for each tile magnet B332, the projections of the connection surface C and the connection surface D on the plane perpendicular to the annular permanent magnet 33 are a line segment G3321 and a line segment H3322, respectively, and the direction of the parallel magnetic field for magnetizing the tile magnet B332 is parallel to the connection line of the midpoints of the line segments G3321 and H3322 (see the arrow in fig. 3), so that the cohesive effect of the air gap magnetic field of the annular permanent magnet 33 spliced into a whole is better.
Further, the stator assembly 1 further comprises a pre-tightening spring 14, one end of the pre-tightening spring 14 presses on the main bearing 12, and the other end of the pre-tightening spring presses on a step inside the base 11, so that the main bearing 12 can be pre-tightened in a constant pressure along the axial direction.
Further, the rotating shaft 31 has an annular groove, the rotor assembly 3 further includes a shaft retainer 15 disposed on the annular groove, the main bearing 12 is located between the preload spring 14 and the shaft retainer 15, and the shaft retainer 15 is in contact with the main bearing 12. Preferably, the base 11 is further provided with an auxiliary bearing 13, the rotating shaft 31 penetrates through the auxiliary bearing 13, the rotating stability of the rotating shaft 31 can be guaranteed through the main bearing 12 and the auxiliary bearing 13, and the shaft retainer ring 15 is matched with the pre-tightening spring 14 for use, so that the main bearing 12 can be guaranteed to be installed in place and reasonably pre-tightened, and the accuracy, the service life and the service performance of the main bearing 12 can be improved.
The utility model discloses a base 11 sets up two bearing rooms along the axial, be main bearing room and auxiliary bearing room respectively, a 12 and auxiliary bearing 13 of installation main bearing, wherein the inner wall of main bearing room is hugged closely outward to pretension spring 14 on the main bearing room, the one end of pivot 31 and the shell 32 coaxial coupling that has the center mounting hole, pivot 31 adopts interference fit or interference fit + laser welding with the junction of shell 32, the ring channel and the 15 cooperations of axle retainer ring of the other end of pivot 31, can realize 3 axial fixings of whole rotor subassembly.
Referring to fig. 4, the ring-shaped permanent magnet 33 of the present invention is formed by connecting tile magnets a331 and B332 of two sizes according to a certain arrangement, and arrows in the tile magnets a331 and B332 in fig. 4 respectively indicate their respective magnetizing directions (the magnetizing directions are also the directions of the parallel magnetic fields to be magnetized), and the salient features thereof are represented by better internal magnetism gathering characteristics. Fig. 5 shows the magnetic force line distribution situation on the XY plane perpendicular to the axis of annular permanent magnet 33, under the condition of no magnetic yoke, the magnetic force line that annular permanent magnet 33 formed mainly distributes in the inboard of annular permanent magnet 33, that is, annular permanent magnet 33 has cohesion, and the magnetic force line distribution in the annular permanent magnet 33 outside is very little (magnetic field intensity is weak, and the outside extending direction magnetic field intensity descends rapidly), can make brushless motor's air gap magnetic density bigger like this, the ampere force that annular winding 22 cut the magnetic force line and produce after brushless motor circular telegram is bigger, that is, brushless motor can bear bigger load moment, and such design can let the utility model discloses need not use the magnetic yoke.
Thanks to the internal magnetism-gathering property of the annular permanent magnet 33, the motor does not need to be provided with a magnetic yoke, so the shell 32 can be made of non-magnetic metal or non-metal materials, the shell 32 can be made of aluminum alloy or plastic with light density for the purpose of reducing the inertia of the rotor assembly 3, and can be manufactured by adopting a machining or die sinking process, meanwhile, the shell 32 can support the annular permanent magnet 33 formed by combining the tile magnet A331 and the tile magnet B332, the annular permanent magnet 33 is prevented from falling off due to centrifugal force in the high-speed rotation process, and the annular permanent magnet 33 is adhered to the inner wall of the shell 32 through a high-strength adhesive.
The inner wall of one end of an annular winding 22 of the armature component 2 is sleeved on an insulated armature framework 21, the joint of the armature framework and the insulated armature framework is adhered together by adopting a high-strength adhesive, the armature framework 21 can be sleeved on a base 11 in the stator component 1 and is fixedly adhered, the annular winding 22 is arranged near the inner side wall of the annular permanent magnet 33, a magnetic field gathered at the inner side of the annular permanent magnet 33 forms a higher magnetic field strength area, and the electrified annular winding 22 is arranged in the high-strength magnetic field of the annular permanent magnet 33 to cut magnetic lines of force to generate higher torque output. Because the annular permanent magnet 33 of the utility model has the internal magnetism gathering property, the utility model can still provide high air gap density without using a magnetic conduction magnetic yoke, and the magnetic conduction magnetic yoke is usually inconvenient to be formed by using a die process, so that the manufacturing cost is high; in addition, the annular permanent magnet 33 is a part of the rotor assembly 3 in the brushless motor, which is rotatable, and there is no N-pole or S-pole alternation inside the metal parts of the rotor assembly 3 that are relatively stationary with respect to the annular permanent magnet 33, so that the brushless motor has no iron loss, and thus has higher output efficiency than a common brushless motor.
It will be understood by those skilled in the art that the foregoing is merely a preferred embodiment of the present invention, and is not intended to limit the invention to the particular forms disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. The utility model provides a high heat dissipation permanent magnet brushless motor who possesses interior magnetism characteristic, its characterized in that includes stator module, armature assembly, rotor subassembly and radiator unit, stator module includes the base and sets up the base bearing on this base, armature assembly includes armature skeleton and annular winding, armature skeleton fixed mounting is on this base, annular winding installs on this armature skeleton, rotor subassembly includes pivot, shell and annular permanent magnet, the pivot is installed on this base through this base bearing, the shell is fixed to wear to adorn in this pivot, the fixed dress of annular permanent magnet is on the inner wall of this shell and with the coaxial setting of this pivot, this annular winding is enclosed to annular permanent magnet, wherein:
the heat dissipation assembly comprises a heat dissipation silica gel ring and a plurality of heat dissipation fins which are uniformly distributed on the inner wall of the heat dissipation silica gel ring in the circumferential direction, the heat dissipation silica gel ring is supported by the base and is in contact with the inner wall of the annular winding, a first ventilation hole communicated with the inner cavity of the heat dissipation silica gel ring is formed in the base, and a second ventilation hole communicated with the inner cavity of the heat dissipation silica gel ring is formed in the shell;
the annular permanent magnet comprises a plurality of tile magnets A and a plurality of tile magnets B which are alternately arranged and fixedly connected together to form the annular permanent magnet with an inner cylindrical surface and an outer cylindrical surface, each tile magnet A and each tile magnet B are formed by magnetizing parallel magnetic fields, and the radian of each tile magnet B is smaller than that of each tile magnet A;
for any two adjacent tile magnets A, the magnetizing direction of one tile magnet A is that the inner arc surface points to the outer arc surface, and the magnetizing direction of the other tile magnet A is that the outer arc surface points to the inner arc surface;
for every tile magnet B, it has connection face C and connection face D, and its direction of magnetizing is the connection face D of connecting face C point to, and connection face C is connected for the tile magnet A of the directional extrados of extrados with the direction of magnetizing, connection face D is connected for the tile magnet A of the directional extrados of extrados with the direction of magnetizing.
2. The brushless permanent magnet motor with high heat dissipation and internal magnetic properties according to claim 1, wherein for each tile magnet a, the projections of the inner arc surface and the outer arc surface on a plane perpendicular to the annular permanent magnet are arc E and arc F, respectively, and the direction of the parallel magnetic field for magnetizing the tile magnet a is parallel to the connecting line of the midpoints of the arc E and the arc F.
3. The brushless permanent magnet motor with high heat dissipation and internal magnetic properties according to claim 1, wherein for each tile magnet B, the projections of the connecting surface C and the connecting surface D on a plane perpendicular to the annular permanent magnet are a line segment G and a line segment H, respectively, and the direction of the parallel magnetic field for magnetizing the tile magnet B is parallel to the connecting line of the midpoints of the line segments G and H.
4. The brushless permanent magnet motor with high heat dissipation and internal magnetic properties according to claim 1, wherein the stator assembly further comprises a pre-tightening spring, one end of the pre-tightening spring presses on the main bearing, and the other end of the pre-tightening spring presses on a step inside the base.
5. The brushless permanent magnet motor with high heat dissipation and internal magnetic properties according to claim 4, wherein the rotating shaft has an annular groove, the rotor assembly further comprises a shaft retainer ring disposed on the annular groove, the main bearing is located between the pre-tightening spring and the shaft retainer ring, and the shaft retainer ring is in contact with the main bearing.
6. The brushless permanent magnet motor with high heat dissipation and internal magnetic properties according to claim 1, wherein the radian of each tile magnet B is 40% to 60% of the radian of each tile magnet a.
7. The brushless permanent magnet motor with high heat dissipation and internal magnetic properties according to claim 1, wherein the housing is made of aluminum alloy or plastic.
8. The brushless permanent magnet motor with high heat dissipation and internal magnetic properties according to claim 1, wherein the ring-shaped permanent magnet is adhered to the inner wall of the housing by an adhesive, and the armature frame is adhered to the base by an adhesive.
9. The brushless permanent magnet motor with high heat dissipation and internal magnetic properties according to claim 1, wherein an auxiliary bearing is further disposed on the base, and the rotating shaft passes through the auxiliary bearing.
10. The brushless permanent magnet motor with internal magnetism-gathering performance according to claim 1, wherein an inner wall of one end of the annular winding is fixedly sleeved on the armature framework.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922345041.5U CN210927419U (en) | 2019-12-24 | 2019-12-24 | High-heat-dissipation permanent magnet brushless motor with internal magnetism-gathering characteristic |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922345041.5U CN210927419U (en) | 2019-12-24 | 2019-12-24 | High-heat-dissipation permanent magnet brushless motor with internal magnetism-gathering characteristic |
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| CN210927419U true CN210927419U (en) | 2020-07-03 |
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| CN201922345041.5U Active CN210927419U (en) | 2019-12-24 | 2019-12-24 | High-heat-dissipation permanent magnet brushless motor with internal magnetism-gathering characteristic |
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| CN (1) | CN210927419U (en) |
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