Inner rotor brushless motor magnetic shoe fixing structure

Abstract

The utility model relates to the technical field of brushless motors, and discloses an inner rotor brushless motor magnetic shoe fixing structure, which comprises a casing, a rotor assembly and a stator assembly are arranged in the casing, the rotor assembly comprises a first ball bearing and a motor shaft, the first ball bearing is fixedly mounted on the motor shaft, and the stator assembly is fixedly mounted on the motor shaft. The motor shaft is provided with a rotor core, the motor shaft is fixedly provided with a first thrust ring, the first thrust ring is provided with an annular groove, the rotor core is provided with a magnet, the magnet is provided with a step, and the magnet abuts against the inner wall of the annular groove of the first thrust ring. According to the utility model, the step-shaped characteristics are added at the two ends of the magnet, the thrust rings are added at the two sides of the rotor iron core, the magnet is axially pressed by the thrust rings, and the annular radial structures of the thrust rings are matched with the outer diameters of the steps of the magnet, so that the retention force is enhanced, the influence caused by magnetic pulling force and centrifugal force of the magnet is resisted, and the magnet is prevented from falling off.

Description

Technical Field

[0001] The utility model relates to the technical field of brushless motors, in particular to a magnetic shoe fixing structure for an inner rotor brushless motor. Background Art

[0002] When the motor is used at an ambient temperature of 110 degrees, ferrite magnets are usually used. Due to the problem of ferrite magnet technology, ferrite is not easy to be made into a ring shape and is generally made into a sheet (tile shape).

[0003] When the ambient temperature is 110 degrees and the motor is running under load, the temperature of the internal magnet will reach about 160 degrees. Under such high temperature conditions, the strength of the glue decreases, and the retention force between the magnet and the rotor core also decreases, which is insufficient to resist the magnetic pull of the stator core on the magnet and the centrifugal force of the magnet itself. There is a risk of the magnet falling off, causing the motor to fail. Therefore, an inner rotor brushless motor magnetic shoe fixing structure is proposed to solve the above problems. Utility Model Content

[0004] The purpose of the utility model is to provide a magnetic shoe fixing structure of an inner rotor brushless motor, so as to solve the above-mentioned problem.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solution: a magnetic shoe fixing structure of an inner rotor brushless motor, comprising a housing, a rotor assembly disposed inside the housing, and a stator assembly disposed inside the housing;

[0006] The rotor assembly includes a ball bearing and a motor shaft, the ball bearing is fixedly mounted on the motor shaft, a rotor core is provided on the motor shaft, a first thrust ring is fixedly mounted on the motor shaft, an annular groove is provided on the first thrust ring, a magnet is provided on the rotor core, a step is provided on the magnet, and the magnet abuts against the inner wall of the annular groove of the first thrust ring.

[0007] Preferably, a second ball bearing is fixedly mounted on the motor shaft, and a second thrust ring is fixedly mounted on the motor shaft.

[0008] Preferably, the stator assembly includes a rear bobbin, a stator core and a front bobbin, the rear bobbin is fixedly mounted on one end of the stator core, the front bobbin is fixedly mounted on the other end of the stator core, and the stator core is provided with enameled wire.

[0009] Preferably, an adapter plate assembly is provided on the rear bobbin, and the rotor assembly is located inside the stator core.

[0010] Preferably, the housing is provided with a back cover, and the back cover is fixed to the housing by screws.

[0011] Preferably, a wave pad assembly is provided on the rear cover.

[0012] The utility model provides a magnetic shoe fixing structure for an inner rotor brushless motor. It has the following beneficial effects:

[0013] The utility model adds step-shaped features at both ends of the magnet and simultaneously adds thrust rings on both sides of the rotor core. The thrust rings axially compress the magnets and the annular radial structure of the thrust rings matches the outer diameter of the magnet steps, thereby enhancing the holding force, thereby resisting the influence of magnetic pulling force and the centrifugal force of the magnet and preventing the magnet from falling off. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0015] Figure 1 This is a schematic diagram of the overall structure of the utility model;

[0016] Figure 2 This is a schematic diagram of the rotor assembly structure of the utility model;

[0017] Figure 3 This is a schematic diagram of the magnet structure of the utility model;

[0018] Figure 4 This is a schematic structural diagram of the first thrust ring of the utility model;

[0019] Figure 5 This is a schematic diagram of the structure of the stator assembly of the utility model;

[0020] Figure 6 This is a schematic diagram of the cross-sectional structure of the motor of the present utility model.

[0021] In the figure: 1. Casing; 2. Rotor assembly; 201. Ball bearing 1; 202. First thrust ring; 2021. Annular groove; 203. Magnet; 2031. Step; 204. Rotor core; 205. Ball bearing 2; 206. Second thrust ring; 207. Motor shaft; 3. Stator assembly; 301. Adapter plate assembly; 302. Rear bobbin; 303. Enameled wire; 304. Stator core; 305. Front bobbin; 4. Rear cover; 5. Screws; 6. Wave pad assembly. DETAILED DESCRIPTION

[0022] 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.

[0023] like Figure 1-6 As shown, the utility model provides a technical solution: an inner rotor brushless motor magnetic shoe fixing structure, comprising a housing 1, a rotor assembly 2 is arranged inside the housing 1, and a stator assembly 3 is arranged inside the housing 1;

[0024] The rotor assembly 2 includes a ball bearing 201 and a motor shaft 207. The ball bearing 201 is fixedly mounted on the motor shaft 207. The motor shaft 207 is provided with a rotor core 204. The motor shaft 207 is fixedly mounted with a first thrust ring 202. The first thrust ring 202 is provided with an annular groove 2021. The rotor core 204 is provided with a magnet 203. The magnet 203 is provided with a step 2031. The magnet 203 abuts against the inner wall of the annular groove 2021 of the first thrust ring 202.

[0025] A second ball bearing 205 is fixedly mounted on the motor shaft 207 , and a second thrust ring 206 is fixedly mounted on the motor shaft 207 .

[0026] The stator assembly 3 includes a rear bobbin 302 , a stator core 304 and a front bobbin 305 . The rear bobbin 302 is fixedly mounted on one end of the stator core 304 , and the front bobbin 305 is fixedly mounted on the other end of the stator core 304 . The stator core 304 is provided with enameled wire 303 .

[0027] An adapter plate assembly 301 is provided on the rear bobbin 302 , and the rotor assembly 2 is located inside the stator core 304 .

[0028] The housing 1 is provided with a back cover 4 , which is fixed to the housing 1 by screws 5 .

[0029] A wave pad assembly part 6 is provided on the rear cover 4 .

[0030] During use, by adding step 2031 shape features at both ends of the magnet 203 and adding thrust rings on both sides of the rotor core 204 at the same time, the thrust rings are used to axially press the magnet 203 and the annular radial structure of the thrust rings is matched with the outer diameter of the magnet steps to enhance the holding force, thereby resisting the influence of magnetic pull and centrifugal force of the magnet 203 and preventing the magnet 203 from falling off.

[0031] The annular groove 2021 in the present application is an annular radial structure provided on the thrust ring.

[0032] It should be noted that in this DC brushless inner rotor motor, the adapter board assembly 301 is connected to the external control board and power supply. After power is applied, the control board supplies different currents to the armature windings wound around the stator core 304 according to the algorithm of the internal software, so that each phase winding is turned on in a certain time sequence, and the rotor assembly 2 is rotated through electronic commutation.

[0033] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A magnetic shoe fixing structure for an inner rotor brushless motor, comprising a housing (1), characterized in that: A rotor assembly (2) is arranged inside the casing (1), and a stator assembly (3) is arranged inside the casing (1); The rotor assembly (2) comprises a ball bearing (201) and a motor shaft (207), wherein the ball bearing (201) is fixedly mounted on the motor shaft (207), a rotor core (204) is arranged on the motor shaft (207), a first thrust ring (202) is fixedly mounted on the motor shaft (207), an annular groove (2021) is provided on the first thrust ring (202), a magnet (203) is arranged on the rotor core (204), a step (2031) is provided on the magnet (203), and the magnet (203) abuts against the inner wall of the annular groove (2021) of the first thrust ring (202).

2. The inner rotor brushless motor magnetic shoe fixing structure according to claim 1, characterized in that: A second ball bearing (205) is fixedly mounted on the motor shaft (207), and a second thrust ring (206) is fixedly mounted on the motor shaft (207).

3. The inner rotor brushless motor magnetic shoe fixing structure according to claim 1, characterized in that: The stator assembly (3) comprises a rear bobbin (302), a stator core (304) and a front bobbin (305); the rear bobbin (302) is fixedly mounted on one end of the stator core (304); the front bobbin (305) is fixedly mounted on the other end of the stator core (304); and an enameled wire (303) is arranged on the stator core (304).

4. The inner rotor brushless motor magnetic shoe fixing structure according to claim 3, characterized in that: An adapter plate assembly (301) is arranged on the rear bobbin (302), and the rotor assembly (2) is located inside the stator core (304).

5. The inner rotor brushless motor magnetic shoe fixing structure according to claim 1, characterized in that: The housing (1) is provided with a rear cover (4), and the rear cover (4) is fixedly mounted on the housing (1) by means of screws (5).

6. The inner rotor brushless motor magnetic shoe fixing structure according to claim 5, characterized in that: The rear cover (4) is provided with a wave pad assembly part (6).

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