Outer rotor brushless motor with novel rotor support structure

Abstract

The utility model relates to the technical field of outer rotor brushless motors, in particular to an outer rotor brushless motor with a novel rotor bracket structure, which comprises a rotor assembly, a stator assembly, a clamp spring, a ball bearing I, a waveform gasket and a ball bearing II, the snap spring, the ball bearing I, the waveform gasket and the ball bearing II are sequentially mounted on the stator assembly and the rotor assembly; the rotor assembly comprises a magnetic conduction ring, a magnet, a motor shaft and a rotor support. According to the utility model, the rotor bracket, the magnetic conductive ring, the motor shaft and the magnet are assembled to form the rotor assembly, the rotor bracket is lengthened, and the magnetic conductive ring is assembled in the rotor bracket, so that the stability of the rotor assembly is improved, and the contact area with the magnetic conductive ring is increased. Therefore, the holding force of the rotor bracket and the magnetic conduction ring is increased, the jumping of the rotor assembly is reduced, the problems that the magnetic conduction ring is loosened and the magnet and the stator core are scraped when the motor rotates at a high speed are solved, good use experience is brought to consumers, and the motor is very beneficial to products using the motor.

Description

Technical Field

[0001] The utility model relates to the technical field of outer rotor brushless motors, in particular to an outer rotor brushless motor with a novel rotor bracket structure. Background Art

[0002] The traditional brushless outer rotor motor (ring magnet structure) has a small contact area between the rotor bracket and the magnetic ring due to the processing, manufacturing, assembly errors of various parts and the small contact area between the magnetic ring and the bracket. Figure 4 ), the holding force is insufficient, the rotor assembly vibrates greatly, and when the motor runs at high speed, the magnetic ring becomes loose and the magnet and stator core scrape.

[0003] To increase the holding force between the rotor bracket and the magnetic ring, reduce rotor assembly runout, and address the problems of loose magnetic rings and scraping between the magnets and the stator core, high dimensional accuracy requirements for the magnetic ring, rotor bracket, and magnets are required, as well as high assembly process requirements. This increases the manufacturing cost of the motor.

[0004] In order to use common processes without increasing the cost of the motor, and to increase the holding force between the rotor bracket and the magnetic ring, reduce the vibration of the rotor assembly, and solve the problems of loose magnetic ring and scraping between the magnet and the stator core, an outer rotor brushless motor with a new rotor bracket structure is proposed. Utility Model Content

[0005] The purpose of the present utility model is to provide an outer rotor brushless motor with a novel rotor support structure to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: an outer rotor brushless motor with a novel rotor bracket structure, comprising: a rotor assembly, a stator assembly and a retaining spring, a first ball bearing, a corrugated gasket and a second ball bearing; the retaining spring, the first ball bearing, the corrugated gasket and the second ball bearing are sequentially mounted on the stator assembly and the rotor assembly; the rotor assembly comprises: a magnetic ring, a magnet, a motor shaft and a rotor bracket; the motor shaft is fixedly connected at the center of the top circle of the inner wall of the rotor bracket, the magnetic ring is fixedly mounted on the annular inner wall of the rotor bracket, and the magnet is mounted on the annular inner wall of the magnetic ring, and the magnetic ring and the magnet are both highly located inside the rotor bracket.

[0007] Preferably, the stator assembly includes: a stator bracket and a stator core; the upper inner wall of the stator bracket is rotatably connected to the outer wall of the motor shaft through ball bearing 2, and the lower inner wall of the stator bracket is rotatably connected to the outer wall of the motor shaft through ball bearing 1, and the stator core is fixedly connected to the stator bracket. The stator assembly also includes: an atomic wire and a heat shrinkable sleeve; three atomic wires and three heat shrinkable sleeves are provided, and the heat shrinkable sleeve is sleeved on the outer wall of the atomic wire, one end of the atomic wire is connected to the stator core, and the other end movably passes through the stator bracket and extends outward.

[0008] Preferably, the corrugated gasket is sleeved on the outer wall of the motor shaft and is in contact with the stator bracket and the ball bearing respectively.

[0009] Preferably, an annular groove is formed on the outer wall of the motor shaft, and the retaining spring is clamped in the annular groove.

[0010] Preferably, the outer wall of the motor shaft is further provided with a flat keyway for connecting to external equipment, and the top of the rotor bracket is provided with a plurality of heat dissipation holes which are equally divided in a circle around the periphery of the motor shaft.

[0011] Compared with the prior art, the beneficial effects of the present invention are:

[0012] By designing a rotor bracket that assembles with a magnetic ring, motor shaft, and magnet to form a rotor assembly, the rotor bracket is lengthened and the magnetic ring is mounted inside the rotor bracket, improving the stability of the rotor assembly and increasing the contact area with the magnetic ring. This increases the holding force between the rotor bracket and the magnetic ring, reduces rotor assembly vibration, and solves the problems of loosening the magnetic ring and scraping between the magnet and the stator core at high motor speeds, providing consumers with a better user experience. This is very beneficial for products using motors. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a cross-sectional view of the rotor assembly of the present utility model;

[0014] Figure 2 This is a structural diagram of the rotor bracket of the utility model;

[0015] Figure 3 This is the appearance diagram of the motor of this utility model;

[0016] Figure 4 This is the assembly drawing of the motor of this utility model;

[0017] Figure 5 This is a structural diagram of the stator assembly of the utility model.

[0018] In the figure: 1. Magnetic ring; 2. Magnet; 3. Motor shaft; 4. Rotor bracket; 5. Retaining spring; 6. Ball bearing 1; 7. Corrugated gasket; 8. Atomic wire; 9. Stator bracket; 10. Heat shrink tubing; 11. Stator core; 12. Ball bearing 2. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] like Figure 1-5 As shown, an outer rotor brushless motor with a novel rotor support structure includes: a rotor assembly, a stator assembly and a retaining spring 5, a ball bearing 1 6, a corrugated gasket 7 and a ball bearing 2 12; the retaining spring 5, the ball bearing 1 6, the corrugated gasket 7 and the ball bearing 2 12 are installed on the stator assembly and the rotor assembly in sequence; the rotor assembly includes: a magnetic ring 1, a magnet 2, a motor shaft 3, and a rotor support 4; the motor shaft 3 is fixedly connected to the center of the top circle of the inner wall of the rotor support 4, the magnetic ring 1 is fixedly installed on the annular inner wall of the rotor support 4, and the magnet 2 is installed on the annular inner wall of the magnetic ring 1, and the magnetic ring 1 and the magnet 2 are both located at a height inside the rotor support 4.

[0021] The stator assembly includes: a stator bracket 9 and a stator core 11; the upper inner wall of the stator bracket 9 is rotatably connected to the outer wall of the motor shaft 3 through a ball bearing 2 12, and the lower inner wall of the stator bracket 9 is rotatably connected to the outer wall of the motor shaft 3 through a ball bearing 1 6. The stator core 11 is fixedly connected to the stator bracket 9. The stator assembly also includes: an atomic wire 8 and a heat shrink sleeve 10; three atomic wires 8 and heat shrink sleeves 10 are provided, and the heat shrink sleeve 10 is sleeved on the outer wall of the atomic wire 8, one end of the atomic wire 8 is connected to the stator core 11, and the other end movably passes through the stator bracket 9 and extends outward, the corrugated gasket 7 is sleeved on the outer wall of the motor shaft 3, and contacts the stator bracket 9 and the ball bearing 6 respectively; the outer wall of the motor shaft 3 is provided with an annular groove, and the retaining spring 5 is clamped in the annular groove; the outer wall of the motor shaft 3 is also provided with a flat key groove for connecting external equipment, and the top of the rotor bracket 4 is provided with a plurality of heat dissipation holes, which are equally divided on the periphery of the motor shaft 3.

[0022] The working principle of this utility model is as follows:

[0023] Connect the atomic wire 8 to the external drive circuit. After power is turned on, the external drive circuit determines the rotor position based on the back electromotive force signal of the motor, thereby giving different currents to the armature windings wound around the stator core 11, so that each phase winding is turned on in a certain time sequence, and the rotor assembly is rotated through electronic commutation.

[0024] By lengthening the rotor bracket 4 and assembling the magnetic ring 1 inside the rotor bracket 4, the stability of the rotor assembly is improved, the vibration of the rotor assembly is reduced, and the contact area with the magnetic ring 7 is increased, thereby increasing the holding force between the rotor bracket 4 and the magnetic ring 1, solving the problems of the magnetic ring 1 loosening and the magnet 2 scratching against the stator core 11 when the motor is at high speed.

[0025] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely preferred examples of the present invention and are not intended to limit the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and improvements fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. An outer rotor brushless motor with a new rotor support structure, characterized in that: include: A rotor assembly, a stator assembly and a retaining spring (5), a first ball bearing (6), a wave washer (7) and a second ball bearing (12); The retaining spring (5), the first ball bearing (6), the wave washer (7) and the second ball bearing (12) are sequentially mounted on the stator assembly and the rotor assembly; The rotor assembly comprises: a magnetic ring (1), a magnet (2), a motor shaft (3), and a rotor bracket (4); The motor shaft (3) is fixedly connected to the center of the top of the inner wall of the rotor bracket (4), the magnetic ring (1) is fixedly mounted on the annular inner wall of the rotor bracket (4), and the magnet (2) is mounted on the annular inner wall of the magnetic ring (1), and the magnetic ring (1) and the magnet (2) are both located inside the rotor bracket (4).

2. The outer rotor brushless motor with a novel rotor support structure according to claim 1 is characterized in that: The stator assembly comprises: a stator bracket (9) and a stator core (11); The upper portion of the inner wall of the stator bracket (9) is rotatably connected to the outer wall of the motor shaft (3) via a second ball bearing (12), and the lower portion of the inner wall of the stator bracket (9) is rotatably connected to the outer wall of the motor shaft (3) via a first ball bearing (6), and the stator core (11) is fixedly connected to the inside of the stator bracket (9).

3. The outer rotor brushless motor with a novel rotor support structure according to claim 2 is characterized in that: The stator assembly further includes: an atomic wire (8) and a heat shrink tubing (10); Three atomic wires (8) and three heat shrinkable sleeves (10) are provided, and the heat shrinkable sleeves (10) are sleeved on the outer wall of the atomic wire (8); one end of the atomic wire (8) is connected to the stator core (11), and the other end movably passes through the stator bracket (9) and extends outward.

4. The outer rotor brushless motor with a novel rotor support structure according to claim 1 is characterized in that: The corrugated gasket (7) is sleeved on the outer wall of the motor shaft (3) and is in contact with the stator bracket (9) and the ball bearing (6) respectively.

5. The outer rotor brushless motor with a novel rotor support structure according to claim 1 is characterized in that: An annular groove is provided on the outer wall of the motor shaft (3), and the clamping spring (5) is clamped in the annular groove.

6. The outer rotor brushless motor with a novel rotor support structure according to claim 1 is characterized in that: The outer wall of the motor shaft (3) is also provided with a flat keyway for connecting to external equipment. The top of the rotor bracket (4) is provided with a plurality of heat dissipation holes which are equally divided in a circle and arranged on the periphery of the motor shaft (3).

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