CN115001230A - Flat outer rotor brushless direct current motor for axially limited space - Google Patents
Flat outer rotor brushless direct current motor for axially limited space Download PDFInfo
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- CN115001230A CN115001230A CN202210703514.8A CN202210703514A CN115001230A CN 115001230 A CN115001230 A CN 115001230A CN 202210703514 A CN202210703514 A CN 202210703514A CN 115001230 A CN115001230 A CN 115001230A
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- rotor
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- core
- motor
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
- H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
- H02K21/22—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating around the armatures, e.g. flywheel magnetos
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
- H02K5/173—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using bearings with rolling contact, e.g. ball bearings
- H02K5/1732—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using bearings with rolling contact, e.g. ball bearings radially supporting the rotary shaft at both ends of the rotor
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Motor Or Generator Frames (AREA)
Abstract
The invention discloses a flat outer rotor brushless direct current motor for an axially limited space, which comprises a stator component and a rotor component, wherein the stator component is provided with a stator core and a rotor core; the stator assembly comprises a stator mounting seat, a stator core, an upper insulation framework, a lower insulation framework, a coil, an upper deep groove ball bearing and a lower deep groove ball bearing; the rotor assembly comprises a rotating shaft, a shell, a rotor core, magnetic steel, a magnetic steel positioning ring, a rotor compression ring, a wave washer and a retaining ring for the shaft. This flat external rotor brushless DC motor for axial confined space, compact structure can satisfy the use operating mode that the motor provided big moment of torsion under low rotational speed, and the motor has less draw ratio simultaneously, guarantees the validity of using at axial confined space motor.
Description
Technical Field
The invention relates to the technical field of brushless direct current motors, in particular to a flat outer rotor brushless direct current motor for an axially limited space.
Background
Brushless dc motor principle: the brushless direct current motor generally comprises three parts, namely an electronic phase conversion circuit, a rotor position detection circuit and a motor body, wherein the electronic phase conversion circuit comprises a control part and a driving part, and the rotor position detection is generally completed through a position sensor, so that the brushless direct current motor is a typical mechanical and electrical integration product. The outer rotor brushless DC motor is that the stator is embedded in the stator seat, and two ends of the stator seat are respectively provided with a bearing which plays the role of supporting the shaft and the whole rotor. The bottom of the shaft is fixedly connected with the casing in a die-casting mode, and the permanent magnet is arranged on the inner wall of the rotor core.
The control scheme of the brushless direct current motor without the Hall comprises the following steps: similar to the basic principle of a hall brushless dc motor, the BLDC motor is rotated by energizing the stator windings in a certain sequence according to the current position of the rotor by a so-called "six-step commutation method". The difference is that the Hall effect sensor is not needed in the Hall-free brushless direct current motor, and the current position of the rotor is judged by detecting the back electromotive force zero crossing point of the stator winding. Compared with the Hall solution, the most obvious advantages are reduced cost and volume. And the number of the motor leads is changed from 8 to 3, so that the wiring debugging is greatly simplified.
The brushless DC motor has the advantages that: the brushless direct current motor has the advantages of low temperature rise, low noise, large torque, high rotating speed, high efficiency (stable operation, high reliability and good stability), low energy consumption (multistage deceleration loss is eliminated, the comprehensive power saving rate can reach 20-60%), no spark (no spark is generated, the brushless direct current motor is particularly suitable for explosive places), long service life (capable of being continuously used for 30000 hours), and the like.
The flat brushless direct current motor can play unique advantages in certain household appliances and novel medical equipment which are limited in axial space and require low rotating speed and large torque, and is particularly suitable for use environments with harsh heat dissipation conditions such as massage bathtubs or bathing machines.
Patent application No. 202122031837.0 is an outer rotor brushless DC motor, the inside aluminium fore-stock that is provided with of stator module, the aluminium fore-stock of setting is providing under the big moment condition at the motor, very easily causes the motor vibration, influences the output precision of motor. Meanwhile, the aluminum fan blades are arranged outside the rotating shaft, so that a certain heat dissipation effect can be achieved, the length of the axial end is increased, and the structure is not compact. The patent application number 202122014291.8 discloses an outer rotor brushless DC motor, which has the characteristics of compact structure and easy installation. But the assembly seat structure is too complicated, the machining cost is higher, and the slender shaft is difficult to bear large torque for a long time, so that the mechanical fatigue of the shaft is easy to cause, and the reliability of the motor is reduced. Patent application No. 202011203588.2 is an outer rotor brushless DC motor, fixed connection PCB board and first bearing on the inner stator support, direct increase axial motor length, axial structure is not compact.
Disclosure of Invention
To the not enough of above-mentioned prior art, the technical problem that this patent application will solve is how to provide a flat external rotor brushless DC motor for axial confined space, and compact structure can satisfy the motor and provide the use operating mode of big moment of torsion under low rotational speed, and the motor has less draw ratio simultaneously, guarantees the validity that uses at axial confined space motor.
In order to solve the technical problems, the invention adopts the following technical scheme:
a flat outer rotor brushless direct current motor for an axially limited space comprises a stator assembly and a rotor assembly;
the stator assembly comprises a stator mounting seat, a stator core, an upper insulation framework, a lower insulation framework, a coil, an upper deep groove ball bearing and a lower deep groove ball bearing;
the rotor assembly comprises a rotating shaft, a shell, a rotor iron core, magnetic steel, a magnetic steel positioning ring, a rotor compression ring, a wave washer and a retaining ring for the shaft;
the stator core, the upper insulation framework, the lower insulation framework and the coil are located on the radial outer side of the stator mounting seat, the stator core is in interference fit with the radial outer side of the stator mounting seat, the upper insulation framework and the lower insulation framework are located on the axial upper portion and the axial lower portion of the stator core respectively and are in interference fit with a tooth slot of the stator core, and the coil is wound in the tooth slot of the positioning core and located on the outer sides of the upper insulation framework and the lower insulation framework; the upper deep groove ball bearing and the lower deep groove ball bearing are positioned on the radial inner side of the stator mounting seat and the radial outer side of the rotating shaft, and the upper deep groove ball bearing and the lower deep groove ball bearing are arranged in an annular groove of the stator mounting seat;
the utility model discloses a rotor, including rotor core, rotor positioning ring, wave washer, rotor bearing, axle retaining ring, rotor core and rotor, the pivot is fixed in the radial inboard of shell, the inner wall interference fit of rotor core and shell, magnet steel and magnet steel positioning ring interference fit are in rotor core's inboard, the magnet steel is located the mounting groove of magnet steel positioning ring, the rotor clamping ring is located the axial upper portion of rotor core and magnet steel positioning ring, wave washer is located between deep groove ball bearing and the axle retaining ring, set up the ring channel that is used for installing the axle retaining ring in the pivot.
The radial outside of rotor clamping ring is provided with a plurality of triangle archs, the shell corresponds the triangle arch and is provided with a plurality of triangle recesses that can with the protruding joint of triangle.
The motor is a Hall-free outer rotor brushless direct current motor, and the length-diameter ratio of the motor is smaller than 0.25.
Wherein the stator mounting seat is made of a super-hard aluminum 7050 material; the upper insulating framework and the lower insulating framework are made of PA66 material; the rotating shaft is made of 20CrMnTi or 20Mn 2B; the rotor compression ring is made of nylon materials.
Wherein, the stator core is in a 12-slot structure.
The shell is made of cast aluminum materials, and the rotating shaft is cast with the shell into a whole in a pre-embedded die-casting mode.
Wherein, the magnet steel material is permanent magnetic ferrite or neodymium iron boron, adopts 8 utmost point structures.
To sum up, this flat external rotor brushless DC motor for axially limited space, compact structure can satisfy the motor and provide the service condition of big moment of torsion under low rotational speed, and the motor has less slenderness ratio simultaneously, guarantees the validity of using at axially limited space motor.
Drawings
Fig. 1 is a schematic diagram of a flat outer rotor brushless dc motor for an axially limited space according to the present invention.
Fig. 2 is a perspective view of the flat outer rotor brushless dc motor for an axially limited space according to the present invention.
Fig. 3 is a schematic view of a stator mounting.
Fig. 4 is a schematic view of a stator mounting seat and upper and lower deep groove ball bearings.
Fig. 5 is a partial schematic view of a stator assembly.
Fig. 6 is a schematic view of fig. 5 with the coil removed.
Fig. 7 is a schematic view of an upper insulating skeleton and a lower insulating skeleton.
Fig. 8 is a partial schematic view of a rotor assembly.
Fig. 9 is a schematic view of fig. 8 with the housing removed.
Figure 10 is a schematic view of a rotor pressure ring.
Fig. 11 is a schematic view of a housing.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings. In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the orientation words such as "upper, lower" and "top, bottom", etc. is generally based on the orientation or positional relationship shown in the drawings for the convenience of description of the present invention and simplicity of description, and in the case of not making a reverse description, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.
As shown in fig. 1 to 11, a flat type outer rotor brushless dc motor for an axially limited space includes a stator assembly and a rotor assembly;
the stator assembly comprises a stator mounting seat 1, a stator iron core 2, an upper insulation framework 3A, a lower insulation framework 3B, a coil 4, an upper deep groove ball bearing 5A and a lower deep groove ball bearing 5B;
the rotor assembly comprises a rotating shaft 6, a shell 7, a rotor iron core 8, magnetic steel 9, a magnetic steel positioning ring 10, a rotor compression ring 11, a wave washer 12 and a retaining ring 13 for a shaft;
the stator mounting seat 1 is positioned at the axial upper part of the motor and is fixedly connected with the outside through a threaded hole of the stator mounting seat 1; the stator core 2, the upper insulating framework 3A, the lower insulating framework 3B and the coil 4 are located on the radial outer side of the stator installing seat 1, the stator core 2 is in interference fit on the radial outer side of the stator installing seat 1, the upper insulating framework 3A and the lower insulating framework 3B are respectively located on the axial upper portion and the axial lower portion of the stator core 2 and are in interference fit in a tooth slot of the stator core 2, and the coil 4 is wound in the tooth slot of the positioning core 2 and located on the outer sides of the upper insulating framework 3A and the lower insulating framework 3B; the upper deep groove ball bearing 5A and the lower deep groove ball bearing 5B are positioned on the radial inner side of the stator assembling seat 1 and the radial outer side of the rotating shaft 6, and the upper deep groove ball bearing 5A and the lower deep groove ball bearing 5B are arranged in an annular groove of the stator assembling seat 1;
the rotor comprises a shell 7, a rotor iron core 8, magnetic steel 9, a magnetic steel positioning ring 10 and a rotor compression ring 11, wherein the rotor compression ring 11 is positioned on the radial outer side of a stator seat 1, a stator iron core 2, an upper insulating framework 3A, a lower insulating framework 3B and a coil 4, the rotating shaft 6 is fixed on the radial inner side of the shell 7, the shell 7 is made of cast aluminum materials, and the rotating shaft 6 is cast with the shell 7 into a whole in a pre-buried die-casting mode; the rotor core 8 is in interference fit with the inner wall of the shell 7, the magnetic steel 9 and the magnetic steel positioning ring 10 are in interference fit with the inner side of the rotor core 8, the magnetic steel 9 is located in a mounting groove of the magnetic steel positioning ring 10, the rotor pressing ring 11 is located on the axial upper portions of the rotor core 8 and the magnetic steel positioning ring 10, a plurality of triangular protrusions 14 are radially and outwards arranged on the rotor pressing ring 11, a plurality of triangular grooves 15 capable of being clamped with the triangular protrusions are formed in the shell corresponding to the triangular protrusions, and the axial movement of the rotor core 8, the magnetic steel 9 and the magnetic steel positioning ring 10 is limited through the cooperation of the radial triangular protrusions and the triangular grooves of the shell 7; the wave washer 12 is positioned between the upper deep groove ball bearing 5A and the shaft retaining ring 13, and the wave washer 12 plays a role in adjusting the axial clearance between the upper rolling bearing 5A and the lower rolling bearing 5B and is axially fixed through the shaft retaining ring 13; the rotating shaft 6 is provided with an annular groove 16 for installing a shaft check ring 13, the shaft check ring 13 is positioned at the upper part of the rotating shaft 6 and is fixedly installed on the rotating shaft 6 through the annular groove of the rotating shaft 6 to axially limit the motor.
In this embodiment, the motor is a hall-free outer rotor brushless dc motor, and the length-diameter ratio of the motor is less than 0.25.
In this embodiment, the stator mounting base 1 is made of a superhard aluminum 7050 material; the upper insulating framework 3A and the lower insulating framework 3B are made of PA66 material; the rotating shaft 6 is made of 20CrMnTi or 20Mn 2B; the rotor compression ring 11 is made of a nylon material.
In this embodiment, the stator core 2 has a 12-slot structure.
In this embodiment, the magnetic steel 9 is made of permanent magnetic ferrite or neodymium iron boron, and adopts an 8-pole structure.
Finally, it should be noted that: various modifications and alterations of this invention may be made by those skilled in the art without departing from the spirit and scope of this invention. Thus, it is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.
Claims (7)
1. A flat outer rotor brushless direct current motor for an axially limited space comprises a stator assembly and a rotor assembly; it is characterized in that the preparation method is characterized in that,
the stator assembly comprises a stator mounting seat (1), a stator iron core (2), an upper insulation framework (3A), a lower insulation framework (3B), a coil (4), an upper deep groove ball bearing (5A) and a lower deep groove ball bearing (5B);
the rotor assembly comprises a rotating shaft (6), a shell (7), a rotor iron core (8), magnetic steel (9), a magnetic steel positioning ring (10), a rotor pressing ring (11), a wave washer (12) and a retaining ring (13) for a shaft;
the stator core (2), the upper insulation framework (3A), the lower insulation framework (3B) and the coil (4) are located on the radial outer side of the stator installing seat (1), the stator core (2) is in interference fit with the radial outer side of the stator installing seat (1), the upper insulation framework (3A) and the lower insulation framework (3B) are located on the axial upper portion and the axial lower portion of the stator core (2) respectively and are in interference fit with a tooth slot of the stator core (2), and the coil (4) is wound in the tooth slot of the positioning core (2) and located on the outer sides of the upper insulation framework (3A) and the lower insulation framework (3B); the upper deep groove ball bearing (5A) and the lower deep groove ball bearing (5B) are positioned on the radial inner side of the stator mounting seat (1) and the radial outer side of the rotating shaft (6), and the upper deep groove ball bearing (5A) and the lower deep groove ball bearing (5B) are installed in an annular groove of the stator mounting seat (1);
the utility model discloses a rotor structure, including rotor core (6), rotor ring (8) and shell (7), pivot (6) are fixed in the radial inboard of shell (7), rotor core (8) and the inner wall interference fit of shell (7), magnet steel (9) and magnet steel holding ring (10) interference fit are in the inboard of rotor core (8), magnet steel (9) are located the mounting groove of magnet steel holding ring (10), rotor ring (11) are located the axial upper portion of rotor core (8) and magnet steel holding ring (10), wave form packing ring (11) are located between deep groove ball bearing (5A) and the axle retaining ring (13), offer ring channel (16) that are used for installing axle retaining ring (13) in pivot (6).
2. The flat outer rotor brushless direct current motor for the axially limited space according to claim 1, wherein a plurality of triangular protrusions (14) are arranged radially outwards of the rotor compression ring (11), and a plurality of triangular grooves (15) capable of being clamped with the triangular protrusions (14) are arranged on the housing (7) corresponding to the triangular protrusions (14).
3. The flat outer rotor brushless direct current motor for the axially limited space of claim 1, wherein the motor is a hall-free outer rotor brushless direct current motor, and a length-diameter ratio of the motor is less than 0.25.
4. The flat type outer rotor brushless direct current motor for the axially limited space according to claim 1, wherein the stator mounting seat (1) is made of an ultrahard aluminum 7050 material; the upper insulating framework (3A) and the lower insulating framework (3B) are made of PA66 material; the rotating shaft (6) is made of 20CrMnTi or 20Mn 2B; the rotor compression ring (11) is made of a nylon material.
5. The flat type outer rotor brushless direct current motor for the axially limited space according to claim 1, wherein the stator core (2) has a 12-slot structure.
6. The flat type outer rotor brushless direct current motor for the axially limited space according to claim 1, wherein the housing (7) is made of cast aluminum material, and the rotating shaft (6) is cast with the housing (7) into a whole in a pre-embedded die casting manner.
7. The flat type outer rotor brushless direct current motor for the axially limited space of claim 1, wherein the magnetic steel (9) is made of permanent magnetic ferrite or neodymium iron boron and adopts an 8-pole structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210703514.8A CN115001230A (en) | 2022-06-21 | 2022-06-21 | Flat outer rotor brushless direct current motor for axially limited space |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210703514.8A CN115001230A (en) | 2022-06-21 | 2022-06-21 | Flat outer rotor brushless direct current motor for axially limited space |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115001230A true CN115001230A (en) | 2022-09-02 |
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ID=83036693
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210703514.8A Pending CN115001230A (en) | 2022-06-21 | 2022-06-21 | Flat outer rotor brushless direct current motor for axially limited space |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115001230A (en) |
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2022
- 2022-06-21 CN CN202210703514.8A patent/CN115001230A/en active Pending
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