A motor assembly and handheld gimbal

Abstract

The application discloses a motor assembly, which comprises a first shell, a second shell arranged opposite to the first shell, a magnetic ring arranged on the inner wall of the first shell, a motor stator arranged in the inner ring of the magnetic ring, a motor shaft fixed at the bottom of the first shell, a bearing assembly and a locking sleeve, the motor shaft is fixedly connected with the locking sleeve through the bearing assembly, wherein the second shell is provided with a stator support protruding from the second shell, the stator support is integrally formed with the second shell, the motor stator is sleeved on the stator support, the bearing assembly is arranged in the stator support, and the side, away from the stator support, of the second shell is provided with a cavity, the cavity is provided with a motor driving plate, so that the strength of the motor is improved and the overall thickness of the motor is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric machines, in particular to an electric machine assembly and a handheld gimbal. BACKGROUND

[0002] Photographing tools such as cameras are increasingly popular in people's lives, and more and more people who have certain requirements for pictures start to use handheld gimbals to stabilize pictures. Since handheld or unmanned aerial vehicle-mounted gimbals are provided with a gimbal motor for controlling a photographing angle, the requirements for the rotating force, reliability and impact resistance of the gimbal motor are increasingly high.

[0003] The motor structure in the handheld gimbal is the most important part, and currently, the motor structures mostly used are complex in assembly, high in dimensional accuracy, prone to motor shaking and reduction in motor structure strength, and high in motor thickness, thereby causing the gimbal mechanism to be too large. SUMMARY

[0004] The present application aims to provide an electric machine assembly and a handheld gimbal with a stable motor and small motor thickness.

[0005] The present application discloses an electric machine assembly, comprising a first shell, a second shell arranged opposite to the first shell, a magnetic ring arranged on the inner wall of the first shell, a motor stator arranged in the inner ring of the magnetic ring, a motor shaft fixed at the bottom of the first shell, a bearing assembly and a locking sleeve, the motor shaft being fixedly connected with the locking sleeve through the bearing assembly, wherein the second shell is provided with a stator support protruding from the second shell, the stator support is integrally formed with the second shell, the motor stator is sleeved on the stator support, the bearing assembly is arranged in the stator support, and the second shell is provided with a cavity on the side opposite to the stator support, and the cavity is provided with a motor drive board.

[0006] Optionally, the cavity is provided with a first reinforcing rib and a plurality of second reinforcing ribs, the first reinforcing rib is arranged at the bottom of the cavity around the motor shaft, and the second reinforcing ribs are connected with the first reinforcing rib and extend from the first reinforcing rib to the side wall of the cavity.

[0007] Optionally, the bottom of the cavity is provided with a plurality of fixing columns, the fixing columns are arranged between the first reinforcing rib and the side wall of the cavity and connected with the second reinforcing ribs, and the motor drive board is fixed on the fixing columns by screws.

[0008] Optionally, the bearing assembly comprises a front bearing and a rear bearing, the stator support is provided with a front bearing hole and a rear bearing hole, the rear bearing hole is located at one end close to the cavity, the front bearing hole is located at one end away from the rear bearing hole, the front bearing hole is matched with the front bearing, and the rear bearing hole is matched with the rear bearing.

[0009] Optionally, the bearing assembly further comprises a bearing inner ring, the bearing inner ring is arranged between the front bearing and the rear bearing, a bearing through hole is arranged between the front bearing hole and the rear bearing hole, the bearing inner ring is in contact with the side wall of the bearing through hole, and the two end faces of the bearing inner ring are in contact with the inner rings of the front bearing and the rear bearing respectively.

[0010] Optionally, the front bearing hole and the rear bearing hole are both provided with a spline groove.

[0011] Optionally, a motor wiring board is arranged between the motor stator and the cavity, the bottom surface of the cavity is provided with a wire passing through hole, one end of the motor wiring board is connected with the motor stator, and the other end of the motor wiring board passes through the wire passing through hole and is connected with the motor driving board.

[0012] Optionally, the motor shaft is a hollow shaft facilitating wire arrangement, the motor driving board is provided with a driving board hole, and the driving board hole is used for passing through a motor wire.

[0013] Optionally, at least one pair of Hall magnetic induction elements is arranged on the side, away from the motor stator, of the motor driving board, the locking sleeve is located between the motor driving board and the second shell, and the end, close to the motor driving board, of the locking sleeve is provided with a magnet.

[0014] The application further provides a handheld holder, comprising a handle and a holder, the holder part comprises a yaw arm assembly, a roll arm assembly, a pitch arm assembly and a clamping assembly, and further comprises the motor assembly as described above.

[0015] The motor assembly provided by the application has the following advantages: the first shell is formed by injection molding, and one end of the motor shaft is fixedly connected with the bottom of the first shell, so that the stability of the motor shaft is improved; the stator support protrudes from the second shell, the motor stator is sleeved on the stator support, the bearing assembly is arranged in the stator support, the motor stator is fixed and stable and cannot shake, the overall stability is improved, and the coaxiality of the motor shaft and the motor stator is ensured; the cavity is arranged on the second shell opposite to the stator support, the motor driving board is arranged in the cavity, the total thickness of the motor assembly is reduced, the motor shaft passes through the bearing assembly in the stator support and is fixedly connected with the locking sleeve, the assembly is simple, and the connection is compact. BRIEF DESCRIPTION OF DRAWINGS

[0016] The accompanying drawings, which are included to provide a further understanding of the embodiments of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. In the drawings:

[0017] Figure 1 is a schematic view of a handheld gimbal according to an embodiment of the application;

[0018] Figure 2 is a schematic view of an exploded view of a motor assembly according to an embodiment of the application;

[0019] Figure 3 is a schematic view of a bottom view of a second housing according to an embodiment of the application;

[0020] Figure 4 is a schematic view of a top view of a second housing according to an embodiment of the application;

[0021] Figure 5 is a schematic view of a motor stator and a motor terminal board according to an embodiment of the application;

[0022] Figure 6 is a schematic view of a second housing and a motor drive board according to an embodiment of the application.

[0023] Wherein, 100, handheld gimbal; 110, handle; 120, yaw arm assembly; 130, pitch arm assembly; 140, roll arm assembly; 150, clamping assembly; 200, motor assembly; 210, first housing; 220, second housing; 230, motor shaft; 240, magnetic ring; 250, motor stator; 260, bearing assembly; 270, locking sleeve; 221, stator support; 261, front bearing; 262, rear bearing; 263, bearing inner ring; 222, front bearing hole; 223, rear bearing hole; 224, bearing through hole; 225, cavity; 226, first reinforcing rib; 227, second reinforcing rib; 228, fixing column; 300, motor drive board; 310, Hall magnetic induction element; 271, magnet; 251, motor terminal board; 229, wire passing through hole; 320, drive board hole; 250a, stator wire outlet end; 251a, terminal board wire outlet end; 330, motor connection terminal; 340, first connection terminal; 350, second connection terminal; 341, first wire; 351, second wire. DETAILED DESCRIPTION

[0024] The application will be further described with reference to the drawings and optional embodiments.

[0025] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting; it is recognized that the embodiments of the application can be practiced in a variety of ways. One of ordinary skill in the art will readily recognize a wide number of variations of the present application that fall within the scope of the application. Therefore, the specific embodiments are not to be taken as limiting the scope of the application.

[0026] In the description of the present application, the terms "first", "second", "third", etc. are used only to describe the purpose of the description, and should not be interpreted as indicating relative importance or implying the number of the technical features indicated. Therefore, unless otherwise specified, the features defined with "first", "second", etc. can explicitly or implicitly include one or more of the features.

[0027] As shown in Figures 1-6 The motor assembly 200 of the embodiment of the present application is applied to the handheld gimbal 100, and the motor assembly 200 comprises a first shell 210, a motor shaft 230, a magnetic ring 240, a motor stator 250, a second shell 220, a bearing assembly 260, and a locking sleeve 280. The first shell 210 is formed by injection molding. One end of the motor shaft 230 is fixed to the bottom of the first shell 210. Since the material of the motor shaft is different from that of the shell, the fixing mode can adopt injection molding, gluing or interference fit connection, so that the motor shaft 230 is fixed firmly and the strength of the motor shaft 230 is enhanced. The magnetic ring 240 is sleeved on the inner wall of the first shell 211. After the second shell 220 is movably connected with the first shell 210, the motor stator 250 is arranged in the inner ring of the magnetic ring 240.

[0028] It should be noted that the motor assembly 200 of the embodiment of the present application is not only limited to the handheld gimbal 100, but also can be the rotating shaft structure of other devices, such as a mechanical arm, a sports camera, etc. The handheld gimbal 100 comprises a handle 110 and a gimbal (not shown), and the gimbal comprises a yaw arm assembly 120, a roll arm assembly 140, a pitch arm assembly 130, and a clamping assembly 150. The motor assembly 200 is arranged between the handle 110 and the yaw arm assembly 120, between the roll arm assembly 140 and the pitch arm assembly 130, and between the roll arm assembly 140 and the clamping assembly 150. The motor assembly 200 enables the relative rotation between the assemblies.

[0029] For the convenience of description, the motor assembly 200 between the roll arm assembly 140 and the pitch arm assembly 130 is taken as an example for description in the embodiment.

[0030] As shown in Figure 2As shown, the second shell 220 is provided with a stator support 221 protruding from the second shell 220, which is integrally formed with the second shell 220 by injection molding, increasing the strength and stability of the motor assembly 200, the stator support 221 is provided with a stator mounting position for mounting the motor stator 250, the motor stator 250 is sleeved and fixed on the stator support 221, ensuring the stable connection of the motor stator 250 and the second shell 220, so that the motor does not shake, further improving the stability; the bearing assembly 260 is arranged in the stator support, the second shell 220 is provided with an opening through which the motor shaft 230 passes, the motor shaft 230 is fixedly connected with the locking sleeve 270 through the bearing assembly 260, the fixing mode of the locking sleeve 270 can be screwing, gluing or interference fit, one end of the locking sleeve 270 is larger in diameter than the diameter of the opening, so that the first shell 210 and the second shell 220 are limited in the axial direction, and the first shell 210 and the second shell 220 can rotate relatively, the first shell 210 is connected with an integrally formed horizontal roll shaft arm, and the second shell 220 is connected with an integrally formed pitch shaft arm; the second shell 220 is provided with a cavity 225 on the side away from the stator support 221, and a motor drive board is arranged in the cavity 225.

[0031] The motor assembly provided by the application has the advantages that the first shell is formed by injection molding, one end of the motor shaft is fixedly connected with the bottom of the first shell, the stability of the motor shaft is improved, the stator support protrudes from the second shell, the motor stator is sleeved on the stator support, the bearing assembly is arranged in the stator support, the motor stator is fixedly and stably arranged and does not shake, the overall stability is improved, the coaxiality of the motor shaft and the motor stator is ensured, the cavity is arranged on the second shell opposite to the stator support, the motor drive board is arranged in the cavity, the total thickness of the motor assembly is reduced, the motor shaft is fixedly connected with the locking sleeve through the bearing assembly in the stator support, and the assembly is simple and compact.

[0032] As shown in the figure, Figure 3 As shown, the second shell 220 is provided with a cavity 225 on the side opposite to the motor stator 250, the cavity 225 is provided with a first reinforcing rib 226 and a plurality of second reinforcing ribs 227, the first reinforcing rib 226 and the second reinforcing rib 227 are similar to the shape of a rudder, the first reinforcing rib 226 is annular and arranged at the bottom of the cavity 225 around the motor shaft 230, the strength of the second shell 220 around the motor shaft 230 is strengthened, the second reinforcing rib 227 is connected with the first reinforcing rib 226, the second reinforcing rib 227 extends from the side edge of the first reinforcing rib 226 to the side wall of the cavity 225 in a radial manner, the strength of the entire second shell 220 is strengthened, and the operation of the motor is more stable.

[0033] Specifically, the cavity 225 is further provided with a plurality of fixing columns 228 for fixing the motor driving board 300, the fixing columns 228 are arranged between the first reinforcing ribs 226 and the side wall of the cavity 225 and connected with the second reinforcing ribs 227, the strength of the fixing columns is strengthened, the fixing columns 228 are three and distributed in a triangular shape, the stability is good, the motor driving board 300 is fixed on the fixing columns 227 by screws, and the connection is stable and firm.

[0034] As shown in Figure 2 and Figure 4 The bearing assembly 260 includes a front bearing 261 and a rear bearing 262, the stator support 221 is provided with a front bearing hole 261 and a rear bearing hole 262, the rear bearing hole 262 is located at one end close to the cavity 225, the front bearing hole 261 is located at one end away from the rear bearing hole 223, the front bearing hole 222 is matched with the front bearing 261, the rear bearing hole 223 is matched with the rear bearing 262, the two bearing holes are coaxially arranged, the motor stator is guaranteed to be coaxial when rotating around the motor shaft 230, is more stable and cannot shake, the motor shaft 230 is matched with the front bearing 261 and the rear bearing 262 arranged in the stator support 221 at the same time, the sensitivity of rotation is improved, and the motor shaft 230 is also fixed at the same time, the stability of the motor shaft 230 is improved, the front bearing 261 and the rear bearing 262 are far away from each other, the lever arm of the motor shaft 230 is further reduced, and the stability is greatly improved.

[0035] Further, the side edges of the front bearing hole 222 and the rear bearing hole 223 are provided with spline grooves, the spline grooves are uniformly distributed, the assembly requirement of the front bearing 261 and the rear bearing 271 is reduced, the good product rate of bearing assembly is improved while the stability of the structure is ensured; of course, it can also be other key grooves, such as a flat key, the assembly mode of the front bearing 261 and the rear bearing 262 can also be other connection modes, such as clamping, interference fit.

[0036] Further, a smooth bearing through hole 224 is arranged between the front bearing hole 222 and the rear bearing hole 223, a bearing inner ring 263 is arranged between the front bearing 261 and the rear bearing 262, the diameter of the bearing inner ring 263 is smaller than the diameter of the front bearing 261 and the rear bearing 262, the bearing inner ring 263 is sleeved in the inner ring of the front bearing 261 and the rear bearing 262, the two end faces of the bearing inner ring 263 are in contact with the inner rings of the front bearing 261 and the rear bearing 262 respectively, the bearing inner ring 263 is not in contact with the side wall of the bearing through hole 224, the motor shaft 230 drives the bearing inner ring 263, the front bearing 261 and the rear bearing 262 to rotate synchronously, the motor shaft 230 is locked by the locking sleeve 270, the bearing inner ring 224 is between the front bearing 261 and the rear bearing 262, so that the locking sleeve 270 can also lock the inner rings of the front bearing 261 and the rear bearing 262, and the like, so that the motor structure is more firm and stable.

[0037] As shown in Figure 5 and Figure 6 , at least one pair of Hall magnetic induction elements 310 is arranged on the side of the motor driving plate 300 away from the motor stator 250, the locking sleeve 270 is located between the motor driving plate 300 and the cavity 225, a magnet 271 is arranged on one end of the locking sleeve 270 close to the motor driving plate 300, the magnet 271 interacts with the Hall magnetic induction element 310 to convert magnetic force into electrical signal for driving induction rotation, the locking sleeve 270 is provided with a center hole, the magnet 271 is a ring magnet, and the fixing mode of the ring magnet and the locking sleeve 270 adopts gluing and interference connection.

[0038] As shown in Figure 5 , a motor wiring board 251 is arranged between the motor stator 250 and the cavity 225, the bottom surface of the cavity 225 is provided with a wire passing through hole 229, the motor wiring board 251 is a flexible board made of a soft and hard combination board, one end of the motor wiring board 251 is connected with the motor stator 250, and the other end passes through the wire passing through hole 229 and is connected with the motor driving plate 300, a stator wire outlet end 250a provided on the enameled copper wire of the motor stator 250 is electrically connected with the motor wiring board 251 to transmit the electrical signal of the motor stator 250, the motor wiring board 251 is provided with a wiring board wire outlet end 251a, the wiring board wire outlet end 251a passes through the wire passing through hole 229, the motor driving plate 300 is provided with a motor connection terminal 330 on the same side of the Hall magnetic induction element 310, the interface of the wiring board wire outlet end 251a is connected to the motor connection terminal 330 to transmit the electrical signal between the motor stator 250 and the motor driving plate 300, the wiring mode guided by the motor wiring board 251 is adopted to transmit the electrical signal between the motor stator 250 and the motor driving plate 300, so as to reduce the overall thickness of the motor structure.

[0039] AsFigure 6 As shown, the motor shaft 230 is a metal hollow shaft, the motor driving plate is provided with a driving plate hole 320, the motor driving plate 300 is provided with a first connecting terminal 340 on the side of the Hall magnetic induction element 310, the electrical signal of the one end of the holder can pass through the hollow hole of the motor shaft 230 (not shown in the figure), the center hole of the locking sleeve 270 (not shown in the figure), the center hole of the magnet 271 (not shown in the figure) and the driving plate hole 320 of the motor driving plate 300 in sequence through the first wire 341 on the side of the motor shell, and finally connected with the first connecting terminal 340 and transmit the electrical signal, which is convenient for the passing of the electrical connection wire, reduces the reverse torsion force generated by the electrical connection wire when rotating, reduces the load and power consumption, and at the same time, the structure is compact.

[0040] Furthermore, the motor driving plate 300 is provided with a second connecting terminal 350 on the side of the Hall magnetic induction element 310, the second connecting terminal 350 transmits the electrical signal of the one end of the holder and the electrical signal of the motor driving plate 300 to the other end of the holder through the second wire 351.

[0041] The above is a further detailed description of the present application in combination with specific optional embodiments, and the specific implementation of the present application cannot be limited to these descriptions. For ordinary skilled persons in the technical field to which the present application belongs, a number of simple deductions or substitutions can be made without departing from the concept of the present application, and all of them should be regarded as falling within the protection scope of the present application.

Claims

1. An electric machine assembly, characterized by The utility model relates to a motor assembly, including: First shell; Second shell, with first shell opposite arrangement; Magnetic ring, set up on the inner wall of first shell; Motor stator, set up in the inner ring of magnetic ring; Motor shaft, fixed in the bottom of first shell; Bearing assembly and locking sleeve, motor shaft passes through bearing assembly and locking sleeve fixed connection; Wherein, the second shell is provided with the stator support that protrudes from the second shell, the stator support is integrally formed with the second shell, the motor stator is sleeved on the stator support, the bearing assembly is arranged in the stator support, the second shell is provided with the cavity on the side opposite to the stator support, and the cavity is provided with the motor drive board; The bearing assembly includes a front bearing and a rear bearing, the stator support is provided with a front bearing hole and a rear bearing hole, the rear bearing hole is located at one end close to the cavity, the front bearing hole is located at one end away from the rear bearing hole, the front bearing hole is matched with the front bearing, and the rear bearing hole is matched with the rear bearing; The bearing assembly further includes a bearing inner ring, the bearing inner ring is arranged between the front bearing and the rear bearing, a bearing through hole is arranged between the front bearing hole and the rear bearing hole, the bearing inner ring is in contact with the side wall of the bearing through hole, and the two end faces of the bearing inner ring are in contact with the inner rings of the front bearing and the rear bearing respectively; the front bearing hole and the rear bearing hole are both provided with a spline groove, and the spline grooves are uniformly distributed.

2. The motor assembly of claim 1, wherein, A first reinforcing rib and a plurality of second reinforcing ribs are arranged in the cavity, the first reinforcing rib is arranged at the bottom of the cavity around the motor shaft, and the second reinforcing ribs are connected with the first reinforcing rib and extend from the first reinforcing rib to the side wall of the cavity.

3. The motor assembly of claim 2, wherein, A plurality of fixing columns are arranged at the bottom of the cavity, the fixing columns are arranged between the first reinforcing rib and the side wall of the cavity and are connected with the second reinforcing ribs, and the motor drive board is fixed on the fixing columns through screws.

4. An electrical machine assembly as claimed in any of claims 1 to 3, wherein, A motor wiring board is arranged between the motor stator and the cavity, the bottom surface of the cavity is provided with a wire passing hole, one end of the motor wiring board is connected with the motor stator, and the other end of the motor wiring board passes through the wire passing hole and is connected with the motor drive board.

5. The motor assembly of claim 4, wherein, The motor shaft is a hollow shaft for facilitating wiring, a drive board hole is arranged on the motor drive board, and the drive board hole is used for passing through a motor wire.

6. The motor assembly of claim 5, wherein, At least one pair of Hall magnetic induction elements are arranged on the side of the motor drive board away from the motor stator, the locking sleeve is located between the motor drive board and the second shell, and the end of the locking sleeve close to the motor drive board is provided with a magnet.

7. A handheld gimbal, comprising: The utility model relates to a motor assembly, including: First shell; Second shell, with first shell opposite arrangement; Magnetic ring, set up on the inner wall of first shell; Motor stator, set up in the inner ring of magnetic ring; Motor shaft, fixed in the bottom of first shell; Bearing assembly and locking sleeve, motor shaft passes through bearing assembly and locking sleeve fixed connection; Wherein, the second shell is provided with the stator support that protrudes from the second shell, the stator support is integrally formed with the second shell, the motor stator is sleeved on the stator support, the bearing assembly is arranged in the stator support, the second shell is provided with the cavity on the side opposite to the stator support, and the cavity is provided with the motor drive board; The bearing assembly includes a front bearing and a rear bearing, the stator support is provided with a front bearing hole and a rear bearing hole, the rear bearing hole is located at one end close to the cavity, the front bearing hole is located at one end away from the rear bearing hole, the front bearing hole is matched with the front bearing, and the rear bearing hole is matched with the rear bearing; The bearing assembly further includes a bearing inner ring, the bearing inner ring is arranged between the front bearing and the rear bearing, a bearing through hole is arranged between the front bearing hole and the rear bearing hole, the bearing inner ring is in contact with the side wall of the bearing through hole, and the two end faces of the bearing inner ring are in contact with the inner rings of the front bearing and the rear bearing respectively; the front bearing hole and the rear bearing hole are both provided with a spline groove, and the spline grooves are uniformly distributed. A first reinforcing rib and a plurality of second reinforcing ribs are arranged in the cavity, the first reinforcing rib is arranged at the bottom of the cavity around the motor shaft, and the second reinforcing ribs are connected with the first reinforcing rib and extend from the first reinforcing rib to the side wall of the cavity. A plurality of fixing columns are arranged at the bottom of the cavity, the fixing columns are arranged between the first reinforcing rib and the side wall of the cavity and are connected with the second reinforcing ribs, and the motor drive board is fixed on the fixing columns through screws. A motor wiring board is arranged between the motor stator and the cavity, the bottom surface of the cavity is provided with a wire passing hole, one end of the motor wiring board is connected with the motor stator, and the other end of the motor wiring board passes through the wire passing hole and is connected with the motor drive board. The motor shaft is a hollow shaft for facilitating wiring, a drive board hole is arranged on the motor drive board, and the drive board hole is used for passing through a motor wire. At least one pair of Hall magnetic induction elements are arranged on the side of the motor drive board away from the motor stator, the locking sleeve is located between the motor drive board and the second shell, and the end of the locking sleeve close to the motor drive board is provided with a magnet. Including handle and holder, the holder contains the azimuth arm assembly, the cross roll arm assembly, the pitch arm assembly, the clamping assembly, further including the motor assembly of any one of claims 1-6, and the motor assembly is arranged between the handle and the azimuth arm assembly, between the cross roll arm assembly and the pitch arm assembly, and between the cross roll arm assembly and the clamping assembly.

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