Three-phase direct-current brushless motor

Abstract

The utility model discloses a three-phase direct current brushless motor in the technical field of three-phase direct current brushless motors, which comprises a motor shell, a front cover and a bottom cover, the front cover is arranged on the front side of the motor shell and is fixedly connected with the motor shell, and the bottom cover is arranged at the bottom of the motor shell and is fixedly connected with the motor shell. A motor shaft, a stator iron core, a rotor and a plurality of stator chips are arranged in the motor shell, a coil is wound on the outer side of the stator iron core, a coupler is arranged at one end, close to the bottom cover, of the motor shaft, a mounting cavity is formed between the bottom cover and the motor shell, heat dissipation fan blades and a rotating shaft are arranged in the mounting cavity, and the rotating shaft is arranged in the mounting cavity. The rotating shaft is coaxially connected with the coupler, the heat dissipation efficiency can be greatly improved through the active heat dissipation mode of the heat dissipation fan blades, and the problem that the temperature of the motor is too high due to the fact that heat is accumulated in the motor in the running process of the three-phase motor can be effectively solved.

Description

Technical Field

[0001] The utility model relates to the technical field of three-phase brushless DC motors, and specifically relates to a three-phase brushless DC motor. Background Art

[0002] With the improvement of people's living standards and the development of modern production and office automation, equipment such as household appliances and industrial robots is becoming more and more efficient, miniaturized and highly intelligent. As an important part of the actuating element, the motor must have characteristics such as high precision, high speed and high efficiency. Therefore, the application of brushless DC motors has increased rapidly. A three-phase brushless DC motor refers to a motor with three-phase windings, no brushes and commutators (or slip rings), and is driven by direct current through an inverter circuit;

[0003] During the operation of existing three-phase motors, a large amount of heat is generated, and this heat is mainly dissipated through the outer shell in the form of heat radiation. However, the heat dissipation effect of such methods is not ideal, and it is easy to cause the motor temperature to be too high due to slow heat dissipation, thereby damaging the motor. Content of the Utility Model

[0004] In order to overcome the deficiencies of the prior art solutions, the utility model provides a three-phase brushless DC motor, which can effectively solve the technical problem that existing three-phase motors generate a large amount of heat during operation, and this heat is mainly dissipated through the outer shell in the form of heat radiation. However, the heat dissipation effect of such methods is not ideal, and it is easy to cause the motor temperature to be too high due to slow heat dissipation, thereby damaging the motor.

[0005] The technical solution adopted by the utility model to solve its technical problems is: a three-phase brushless DC motor, including a motor housing, a front cover and a bottom cover. The front cover is arranged on the front side of the motor housing and fixedly connected thereto. The bottom cover is arranged at the bottom of the motor housing and fixedly connected thereto. A motor shaft, a stator core, a rotor and a plurality of stator chips are arranged inside the motor housing, and a coil is wound outside the stator core;

[0006] One end of the motor shaft close to the bottom cover is provided with a coupling. An installation cavity is arranged between the bottom cover and the motor housing. A heat dissipation fan blade and a rotating shaft are arranged inside the installation cavity, and the rotating shaft is coaxially connected with the coupling.

[0007] Preferably, a plurality of uniformly distributed heat dissipation fins are formed on the outer wall of the motor housing. The heat dissipation fins are strip-shaped, and a plurality of ventilation holes are formed in the bottom cover.

[0008] Preferably, a circuit board mounting seat is provided on the outer side of the motor housing. A control circuit board, a Hall sensor, and three sets of commutation devices are provided inside the circuit board mounting seat. The Hall sensor and the three sets of commutation devices are electrically connected to the control circuit board.

[0009] Preferably, a plurality of stator chips are fixedly mounted on the outer side of the rotor, and there is a spacing between two adjacent stator chips to form an empty slot.

[0010] Preferably, the coil is provided with three sets of winding outputs, and the coil is electrically connected to the control circuit board.

[0011] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0012] By providing a coupling and a cooling fan blade, the motor shaft drives the cooling fan blade to rotate while rotating, thereby realizing the function effect of heat dissipation. It can effectively avoid the problem that heat is accumulated inside the three-phase motor during operation, resulting in too high a temperature of the motor. When the cooling fan blade rotates, it can take out the heat from the housing. Compared with the traditional three-phase motor that dissipates heat by heat radiation through the housing, the active heat dissipation method of the cooling fan blade can greatly improve the heat dissipation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of a three-phase DC brushless motor of the present utility model;

[0014] Figure 2 It is an exploded view of a three-phase DC brushless motor of the present utility model;

[0015] Figure 3 It is a schematic diagram of the structure of the rotor in a three-phase DC brushless motor of the present utility model.

[0016] Reference numerals in the drawings:

[0017] 1 - Hall sensor, 2 - commutation device, 3 - front cover, 4 - motor shaft, 5 - control circuit board, 6 - heat dissipation fin, 7 - bottom cover, 8 - circuit board mounting seat, 9 - motor housing, 10 - cooling fan blade, 11 - ventilation hole, 12 - rotating shaft, 13 - stator chip, 14 - stator core, 15 - coil, 16 - coupling, 17 - empty slot, 18 - rotor. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0019] As Figures 1 - 3 shown, the present invention provides a three-phase DC brushless motor, including a motor housing 9, a front cover 3 and a bottom cover 7. A circuit board mounting seat 8 is provided on the outer side of the motor housing 9. A control circuit board 5, a Hall sensor 1 and three sets of commutation devices 2 are provided inside the circuit board mounting seat 8. The Hall sensor 1 and the three sets of commutation devices 2 are electrically connected to the control circuit board 5. A plurality of evenly distributed heat dissipation fins 6 are formed on the outer wall of the motor housing 9. The heat dissipation fins 6 are strip-shaped. The bottom cover 7 is provided with a plurality of air vents 11. The front cover 3 is provided on the front side of the motor housing 9 and is fixedly connected thereto. The bottom cover 7 is provided at the bottom of the motor housing 9 and is fixedly connected thereto. A motor shaft 4, a stator core 14, a rotor 18 and a plurality of stator chips 13 are provided inside the motor housing 9. The plurality of stator chips 13 are fixedly installed on the outer side of the rotor 18. A spacing is provided between two adjacent stator chips 13 to form an empty slot 17. A coil 15 is wound around the outer side of the stator core 14. The coil 15 has three sets of winding outputs, and the coil 15 is electrically connected to the control circuit board 5. One end of the motor shaft 4 close to the bottom cover 7 is provided with a coupling 16. An installation cavity is provided between the bottom cover 7 and the motor housing 9. A heat dissipation fan blade 10 and a rotating shaft 12 are provided inside the installation cavity. The rotating shaft 12 is coaxially connected to the coupling 16.

[0020] Compared with the traditional technology: by providing the coupling 16 and the heat dissipation fan blade 10, when the motor shaft 4 rotates, it drives the heat dissipation fan blade 10 to rotate, thereby realizing the heat dissipation function effect. It can effectively avoid the problem that heat accumulates inside the three-phase motor during operation, resulting in too high a temperature of the motor. When the heat dissipation fan blade 10 rotates, it can take out the heat from the housing. Compared with the traditional three-phase motor that dissipates heat by thermal radiation through the housing, the active heat dissipation method of the heat dissipation fan blade 10 can greatly improve the heat dissipation efficiency.

[0021] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above-described exemplary embodiments, and the present utility model can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present utility model. Any reference signs in the claims should not be construed as limiting the claims involved.

Claims

1. A three-phase DC brushless motor, comprising a motor housing, a front cover and a bottom cover. The front cover is provided on the front side of the motor housing and fixedly connected thereto. The bottom cover is provided at the bottom of the motor housing and fixedly connected thereto, characterized in that, Inside the motor housing, there are a motor shaft, a stator core, a rotor, and multiple stator chips. A coil is wound around the outer side of the stator core; One end of the motor shaft close to the bottom cover is provided with a coupling. There is an installation cavity between the bottom cover and the motor housing. Inside the installation cavity, there are a cooling fan blade and a rotating shaft, and the rotating shaft is coaxially connected to the coupling.

2. The three-phase DC brushless motor according to claim 1, characterized in that, A plurality of evenly distributed heat dissipation fins are formed on the outer wall of the motor housing. The heat dissipation fins are strip-shaped, and the bottom cover is provided with a plurality of ventilation holes.

3. A three-phase DC brushless motor according to claim 1, characterized in that, A circuit board mounting seat is provided on the outer side of the motor housing. Inside the circuit board mounting seat, there are a control circuit board, a Hall sensor, and three groups of commutation devices. The Hall sensor and the three groups of commutation devices are all electrically connected to the control circuit board.

4. A three-phase DC brushless motor according to claim 1, characterized in that, A plurality of the stator chips are fixedly installed on the outer side of the rotor, and there is a spacing between adjacent two of the stator chips to form an empty slot.

5. A three-phase DC brushless motor according to claim 3, characterized in that, The coil has three sets of winding outputs, and the coil is electrically connected to the control circuit board.

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