CN216774415U - Low-power outer rotor direct current motor - Google Patents

Abstract

The utility model provides a low-power outer rotor direct current motor which comprises a stator component and a rotor component which are coaxially arranged, wherein the stator component is provided with a middle shaft part, a coil winding is arranged on the periphery of the middle shaft part, an axial insertion hole is formed in the middle shaft part, and two bearings are arranged in the insertion hole; the rotor assembly comprises a rotor shell, a rotor magnetic ring and a rotating shaft, wherein the rotor shell is of a one-way open tubular structure, the outer side wall of the rotor magnetic ring is attached to the inner side wall of the rotor shell, the rotating shaft axially penetrates through the rotor shell and is fixedly connected with the rotor shell, and a matching cavity for accommodating a coil winding is formed between the inner side wall of the rotor magnetic ring and the rotating shaft; the rotating shaft is inserted into the inserting hole and is matched with the first bearing and the second bearing, two clamp spring portions are arranged on the rotating shaft, and the two clamp spring portions are clamped with the outer end faces of the two bearings respectively. The utility model has the advantages of convenient assembly, high matching concentricity of the stator component and the rotor component, good stability and compact integral structure.

Description

Low-power outer rotor direct current motor

Technical Field

The utility model relates to the technical field of brushless direct current motors, in particular to a low-power outer rotor direct current motor.

Background

An electric machine, commonly referred to as a motor, refers to an electromagnetic device that converts or transmits electric energy according to the law of electromagnetic induction, or converts one form of electric energy into another form of electric energy. The motors are classified into dc motors and ac motors according to the kinds of power sources, wherein the dc motors are classified into brushless dc motors and brushed dc motors. The brushless DC motor adopts a semiconductor switching device to realize electronic commutation, namely the electronic switching device replaces a traditional contact commutator and an electric brush; it has the advantages of high reliability, no reversal spark, low mechanical noise, etc., and can be extensively used in recording seats, video recorders, electronic instruments and automatic equipment.

The basic components of the brushless direct current motor comprise a stator component fixedly arranged and a rotor component capable of rotating around a shaft, wherein a coil is arranged on the stator component, a permanent magnet steel and other magnets are arranged on the rotor component, and when current is introduced into the coil, the rotor component can rotate under the action of a magnetic field, so that mechanical driving force is provided.

In the prior art, the problem of insufficient concentricity often exists when the installation of carrying out stator module and rotor subassembly, and the not enough concentricity then can lead to the magnet to produce undulantly when the coil rotates magnetic field direction, and then leads to the motor to take place vibrations, produce the noise. Because the low-power direct current motor has small dead weight and is commonly used in miniaturized equipment, vibration and noise can obviously affect the normal operation of the equipment.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems, the utility model provides a low-power outer rotor direct current motor, which has the advantages of high concentricity between a rotor assembly and a stator assembly, stable matching connection, low jitter and noise during operation and convenience in motor assembly.

In order to achieve the purpose, the utility model adopts the following technical scheme:

a low-power outer rotor direct current motor comprises a stator assembly and a rotor assembly which are coaxially arranged, wherein the stator assembly is provided with a middle shaft part, a coil winding is arranged on the periphery of the middle shaft part, an axial insertion hole is formed in the middle shaft part, and a first bearing close to the first end of the middle shaft part and a second bearing close to the second end of the middle shaft part are arranged in the insertion hole; the rotor assembly comprises a rotor shell, a rotor magnetic ring and a rotating shaft, wherein the rotor shell is of a one-way open tubular structure, the outer side wall of the rotor magnetic ring is attached to the inner side wall of the rotor shell, the rotating shaft axially penetrates through the rotor shell and is fixedly connected with the rotor shell, and a matching cavity for accommodating the coil winding is formed between the inner side wall of the rotor magnetic ring and the rotating shaft; the rotating shaft is inserted into the plug hole and matched with the first bearing and the second bearing, a first clamp spring part and a second clamp spring part are arranged on the rotating shaft, the first clamp spring part is clamped with the outer end face of the first bearing, and the second clamp spring part is clamped with the outer end face of the second bearing; the coil winding is disposed in the mating cavity.

In the utility model, the middle shaft part is matched and connected with the rotating shaft to connect the stator assembly and the rotor assembly into a whole, the two bearing shafts which are respectively arranged at the first end and the second end close to the middle shaft part can improve the coincidence precision of the rotating shaft after matched installation and the axis, and meanwhile, as the bearing shafts are arranged at the positions close to the two ends, the bearing shafts can be clamped into the plug holes from the end openings in the installation process, thus the installation is convenient. After pivot and the cooperation installation of bearing, through setting up two bayonet socket installation jump rings in the pivot, form first jump ring portion and second jump ring portion, first jump ring portion sets up the position near well axial region first end, and form the butt with first bearing terminal surface outwards, second jump ring portion sets up the position near well axial region second end, and form the butt with second bearing terminal surface outwards, the spool can not be along the endwise slip under the common butt effect of first jump ring portion and second jump ring portion, thereby the stability when rotor subassembly is rotatory has been guaranteed. Specifically, set up first jump ring portion earlier, insert the pivot to the spliced eye afterwards, first jump ring portion forms the butt with the outer terminal surface of first bearing this moment, installs second jump ring portion again afterwards, makes second jump ring portion and the outer terminal surface of second bearing form the butt, and the installation accuracy is high, easy operation. The end of the rotating shaft not inserted into the inserting hole is an output end in a working state, the output end can be connected with a working element, such as a fan blade, when the rotating shaft rotates, the fan blade can be driven to rotate, and generally, the output end can be provided with threads or other connectable structures so as to facilitate the installation of the working element.

Furthermore, the stator assembly further comprises a stator core, a stator bushing and a stretching end cover, wherein a mounting part is formed in the middle of the stator core, the mounting part is provided with a mounting hole which is axially through, the periphery of the mounting part is connected with a plurality of radial branches, and the coil windings are wound on the radial branches; the stator bushing comprises a head connecting part with a larger caliber and a tail connecting part with a smaller caliber, the head connecting part is positioned at the outer side of the mounting hole and forms fixed connection with the stretching end cover, and the tail connecting part is inserted into the mounting hole and is matched and fixed with the mounting hole to form the middle shaft part. Can make tensile end cover and stator core form through stator bush and be connected, can set up the connecting hole on through tensile end cover to fix motor and other things through the connecting hole, facilitate the use, still can set up the louvre on the tensile end cover in addition, so that derive the heat of motor during operation.

Further, the head connecting part is provided with a first abutting surface; the tail end of the tail connecting part penetrates out of the mounting hole, and the tail end of the tail connecting part is flanged outwards to form a second abutting surface; the first abutting surface and the second abutting surface are respectively abutted against the end surfaces of two ends of the mounting part. Through the locking of two abutting surfaces, the stator bushing can form the locking of the axial direction with the stator core.

Furthermore, a plurality of racks arranged along the axial direction are formed on the outer side wall of the tail connecting part, a plurality of tooth grooves arranged along the axial direction are formed on the inner side wall of the mounting hole, and each rack is correspondingly matched with one tooth groove. Further, stator module constitute still include the circuit pad, the installation department periphery is located through the suit mouth cover that sets up in the middle part to circuit pad cover to press from both sides between stator bush's head portion of connecting and stator core's radial branch.

Furthermore, the periphery of the installation part is provided with a plurality of clamping teeth, the sleeving opening is provided with a plurality of clamping grooves, and the clamping teeth are matched with the clamping grooves.

Furthermore, the caliber of the inner side wall of the rotor shell is gradually increased from the sealing end to the opening end to form a conical inclined surface, the outer side wall of the rotor magnetic ring forms a conical matching surface with the same taper as the conical inclined surface, and the conical inclined surface and the conical matching surface form interference fit. When the rotor magnetic ring and the rotor shell are assembled, the first end of the rotor magnetic ring is embedded into the rotor shell towards the end plate of the rotor shell, then a press machine is used for pressing the second end of the rotor magnetic ring, the rotor magnetic ring is further pressed into the rotor shell under the guiding fit of the conical inclined plane of the rotor shell on the conical matching surface of the rotor magnetic ring, and the conical inclined plane and the conical matching surface are tightly attached and locked. When the rotor magnetic ring is pressed into the rotor shell, the side plate is elastically deformed under the action of pressure, the caliber of the rotor magnetic ring is enlarged, the rotor magnetic ring can be embedded into the deep part of the rotor shell, and when the pressure disappears, the side plate is elastically restored to generate the clamping force on the rotor magnetic ring, so that the rotor magnetic ring is fixedly arranged in the rotor shell. The installation mode is interference fit, and the caliber of the inner side wall of the rotor shell is equal to or slightly smaller than that of the outer side wall of the rotor magnetic ring at the corresponding position. The rotor magnetic ring and the rotor shell are assembled in the mode, glue is not needed to be used for bonding, mechanical production is facilitated, and the assembling precision is higher.

Furthermore, the cone angle of the cone-shaped inclined plane and the cone-shaped matching surface is 2-10 degrees.

Furthermore, the inner side wall of the rotor magnetic ring forms a cylindrical surface without taper, so that a more uniform magnetic field direction is formed in a matching cavity between the rotor magnetic ring and the rotating shaft.

Furthermore, the circuit pad is connected with a wiring harness assembly, and the wiring harness assembly is fixed with the stretching end cover through a cable tie. The wiring harness assembly is used for supplying power or transmitting signals to the circuit bonding pad, controlling current in the coil winding through the circuit bonding pad, and further adjusting the running state of the motor.

In summary, the following beneficial effects can be obtained by applying the utility model:

1. the rotor assembly and the stator assembly provided by the utility model are convenient to assemble and disassemble, and the motor is convenient to install and disassemble and maintain subsequently.

2. The rotor assembly and the stator assembly have higher concentricity after being installed, the motor generates less shake and noise during operation, and a product adopting the motor has better use comfort.

3. The stator core and even the whole motor structure are connected with the stretching end cover through the stator lining, and the motor and other objects can be fixed through the stretching end cover, so that the motor is convenient to use; the bush part is stable with being connected of stator core, and the concentricity is high, and then makes the pivot of rotor subassembly and stator core form stable connection.

4. The rotor magnet and the rotor shell are in interference fit connection through the conical inclined plane and the conical matching surface, glue is not needed for bonding, mechanical production is facilitated, and assembly precision is high.

Drawings

FIG. 1 is a schematic front view of a motor;

FIG. 2 is a schematic cross-sectional view of the motor;

FIG. 3 is a schematic view of a stator liner construction;

FIG. 4 is a schematic diagram of a wiring harness assembly and circuit pad configuration;

FIG. 5 is a schematic diagram of a stator core and coil winding structure;

FIG. 6 is a schematic cross-sectional view and a partial enlarged view of a stator assembly;

FIG. 7 is a front view of the rotor assembly;

FIG. 8 is a left side view of the rotor housing;

in the figure, 1-stator bushing, 2-coil winding, 3-stator core, 4-circuit pad, 5-wire harness assembly, 6-stretching end cover, 7-rotating shaft, 8-rotor shell, 9-rotor magnetic ring, 11-middle shaft part, 12-head part, 13-tail part, 14-first bearing, 15-second bearing, 31-mounting part, 32-radial branch, 121-first abutting surface, 131-rack, 132-second abutting surface, 311-mounting hole, 312-tooth space, 313-latch, 41-latch, 71-first latch part, 72-second latch part, 81-end plate and 82-side plate.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention; the terms "first" and "second" are used for descriptive purposes only and are not intended to indicate or imply relative importance, and moreover, unless explicitly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Examples

As shown in fig. 1 to 8, the present embodiment provides a low-power external rotor dc motor, which is formed by assembling a stator assembly and a rotor assembly.

The stator assembly includes a stator liner 1, a coil winding 2, a stator core 3, a circuit pad 4, a wire harness assembly 5, and a tension end cap 6.

As shown in fig. 3, the stator bush 1 includes a head joint portion 12 at an upper end and a tail joint portion 13 at a lower end, and the tail joint portion is provided with a clamping strip 131 along an axial direction; as shown in fig. 5, the stator core 3 includes a mounting portion 31 located in the middle and a radial branch 32 radially connected to the outer periphery of the mounting portion, the radial branch is provided with a coil winding 2, a through mounting hole 311 is formed in the middle of the mounting portion 31, a tooth slot 312 is formed on the inner side wall of the mounting hole along the axial direction, and a latch 313 is formed on the outer side wall of the mounting portion; as shown in fig. 4, the circuit pad 4 is connected to the wire harness assembly 5 to form a circuit, and the circuit pad has a ring structure, and has an inner circle in the middle thereof, and the inner circle is formed with a card slot 41.

After the components of the stator assembly are assembled, the tail end portion 13 of the stator bush 1 is inserted into the mounting hole 311 of the stator core 3, the clamping strip 131 on the stator bush is matched with the clamping groove 312 on the stator core, so that the stator bush and the stator core cannot rotate around the shaft relatively, and the head end portion 12 of the stator bush is fixedly connected with the stretching end cover 6. Meanwhile, as shown in fig. 6, the head portion of the stator bushing has a first abutting surface 121, the tail portion of the stator bushing penetrates out of the mounting hole, the tail end of the stator bushing is flanged outwards to form a second abutting surface 132, and the first abutting surface and the second abutting surface abut against the mounting portion from two ends of the mounting portion at the same time, so that axial sliding between the stator bushing and the stator core cannot occur. The tail part is of a hollow tubular structure, and forms a middle shaft part 11 capable of accommodating the rotating shaft 7 after being fixed with the mounting hole, and a first bearing 14 and a second bearing 15 which are respectively close to two ends are arranged inside the middle shaft part. The circuit pad 4 is sleeved on the periphery of the mounting portion and is clamped and fixed with the stator core through the matching of the latch 313 and the clamping groove 41. The circuit pad is arranged between the stator core and the head connecting part of the stator bushing, and is pressed on the stator core through the first abutting surface 121 to form fixed installation. The wiring harness that links to each other with the circuit pad then fixes on tensile end cover through aircraft bandeau gradually, specifically, uses aircraft bandeau to tie up the wiring harness subassembly, later with the head card of ribbon in setting up the ribbon bayonet socket on tensile end cover can.

As shown in fig. 7, the rotor assembly includes a rotating shaft 7, a rotor housing 8 and a rotor magnet ring 9.

The rotating shaft comprises a working end and an inserting end, the working end is provided with threads so as to be convenient for installing elements such as a fan and the like, and a first clamp spring portion and a second clamp spring portion are arranged at the positions close to the inserting end.

The rotor case 8 includes an end plate 81 having a circular plate shape and a side plate 82 formed in a cylindrical shape by being surrounded, and the end plate is provided at and seals one end of the side plate. The caliber of the side plate of the rotor shell is gradually reduced from an opening end to a sealing end to form a conical structure, the cone angle of the conical structure is 6 degrees, and a conical inclined plane is formed on the inner side wall of the side plate. As can be seen from fig. 8, the end plate 81 and the obliquely outwardly projecting side plate 82 can be seen from the left side view of the rotor housing.

The rotor magnetic ring 9 is a hollow cylindrical structure, the caliber of the outer side wall of the rotor magnetic ring gradually increases from the first end to the second end to form a conical matching surface, the conical matching surface is formed, the size of the cone angle of the conical inclined surface is the same, and the caliber of the inner side wall of the rotor magnetic ring is unchanged to form a cylindrical surface.

When the rotor shell and the rotor magnetic ring are installed in a matched mode, a conical matching face located on the outer side wall of a rotor magnet and a conical inclined face located on the inner side wall of the rotor shell can be attached to each other, specifically, the rotor magnetic ring is embedded into a cavity formed by enclosing the side plates and the end plates from a first end towards the direction of the end plates, then pressure is applied from a second end of the rotor magnetic ring through a press machine, the rotor magnetic ring is further pressed into the cavity, the side plates are elastically collided under the action of the press machine to enable the rotor magnetic ring to go deep into the bottom of the cavity, the end face of the first end portion of the rotor magnetic ring is abutted to the inner end face of the end plate, the positioning effect is achieved, then the press machine removes the pressure, at the moment, the side plates are elastically restored to clamp the rotor magnetic ring in the cavity, and the rotor magnetic ring is fixedly installed.

After stator subassembly and rotor subassembly equipment, the pivot is inserted 7 and is gone into to the spliced eye of well axial region 11, and the pivot forms the cooperation with first bearing and second bearing, and the outer terminal surface butt of epaxial first jump ring portion of commentaries on classics and first bearing, second jump ring portion and the outer terminal surface formation butt of second bearing make the pivot can not take place axial with stator module and slide.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still make modifications to the technical solutions described in the foregoing embodiments, or make equivalent substitutions and improvements to part of the technical features of the foregoing embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. The utility model provides a miniwatt external rotor direct current motor, includes the stator module and the rotor subassembly of coaxial setting, its characterized in that: the stator component is provided with a middle shaft part, a coil winding is arranged on the periphery of the middle shaft part, an axial insertion hole is formed in the middle shaft part, and a first bearing close to the first end of the middle shaft part and a second bearing close to the second end of the middle shaft part are arranged in the insertion hole; the rotor assembly comprises a rotor shell, a rotor magnetic ring and a rotating shaft, wherein the rotor shell is of a one-way open tubular structure, the outer side wall of the rotor magnetic ring is attached to the inner side wall of the rotor shell, the rotating shaft axially penetrates through the rotor shell and is fixedly connected with the rotor shell, and a matching cavity for accommodating the coil winding is formed between the inner side wall of the rotor magnetic ring and the rotating shaft; the rotating shaft is inserted into the plug hole and matched with the first bearing and the second bearing, a first clamp spring part and a second clamp spring part are arranged on the rotating shaft, the first clamp spring part is clamped with the outer end face of the first bearing, and the second clamp spring part is clamped with the outer end face of the second bearing; the coil winding is disposed in the mating cavity.

2. A low power external rotor dc motor according to claim 1, wherein: the stator assembly further comprises a stator core, a stator bushing and a stretching end cover, wherein a mounting part is formed in the middle of the stator core and provided with an axially through mounting hole, a plurality of radial branches are connected to the periphery of the mounting part, and the coil windings are wound on the radial branches; the stator bushing comprises a head connecting part with a larger caliber and a tail connecting part with a smaller caliber, the head connecting part is positioned at the outer side of the mounting hole and forms fixed connection with the stretching end cover, and the tail connecting part is inserted into the mounting hole and is matched and fixed with the mounting hole to form the middle shaft part.

3. A low power external rotor dc motor according to claim 2, wherein: the head connecting part is provided with a first abutting surface; the tail end of the tail connecting part penetrates out of the mounting hole, and the tail end of the tail connecting part is flanged outwards to form a second abutting surface; the first abutting surface and the second abutting surface are respectively abutted with the end faces of two ends of the mounting part.

4. A low power external rotor dc motor according to claim 2, wherein: the outer side wall of the tail connecting part is provided with a plurality of racks which are arranged along the axial direction, the inner side wall of the mounting hole is provided with a plurality of tooth sockets which are arranged along the axial direction, and each rack is correspondingly matched with one tooth socket.

5. A low power external rotor dc motor according to claim 2, wherein: the stator assembly further comprises a circuit welding disc, the circuit welding disc sleeve is sleeved on the periphery of the installation part through a sleeve opening arranged in the middle of the circuit welding disc sleeve, and the circuit welding disc sleeve is clamped between a head connection part of the stator bushing and a radial branch of the stator core.

6. A low power external rotor dc motor according to claim 5, wherein: the periphery of the installation part is provided with a plurality of clamping teeth, the sleeving opening is provided with a plurality of clamping grooves, and the clamping teeth are matched with the clamping grooves.

7. A low power external rotor dc motor according to claim 1, wherein: the aperture of the inner side wall of the rotor shell is gradually increased from the sealing end to the opening end to form a conical inclined surface, the outer side wall of the rotor magnetic ring forms a conical matching surface with the same taper as the conical inclined surface, and interference fit is formed between the conical inclined surface and the conical matching surface.

8. A low power external rotor dc motor according to claim 7, wherein: the taper angle of the taper inclined plane and the taper matching surface is 2-10 degrees.

9. A low power external rotor dc motor according to claim 7, wherein: the inner side wall of the rotor magnetic ring forms a cylindrical surface without taper.

10. The low-power external rotor direct current motor according to claim 5, wherein: the circuit pad be connected with the pencil subassembly, the pencil subassembly passes through the ribbon and forms fixedly with tensile end cover.

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