Direct-current brushless motor

Abstract

The utility model discloses a direct current brushless motor in the motor field, which comprises a hood, a rotor and a stator, the hood is composed of a base and a cover body, the top surface of the base is provided with a boss, the top surface of the boss is provided with a circuit board, the side surface of the boss is provided with at least two channels communicated with the bottom of the base, and the bottom of the base is provided with air guide interfaces connected with the openings of the channels. The cover body is provided with at least two heat dissipation holes; the rotor is composed of a rotating shaft and an iron core, one end of the rotating shaft is inserted into the top face of the boss, the other end of the rotating shaft penetrates through the top of the cover body to extend outwards, and the iron core is annular and arranged on the outer side of the rotating shaft to be coaxially fixed. The stator is composed of a fixing ring and a plurality of windings, the fixing ring is tightly attached to the inner wall of the cover body to be fixed and is coaxial with the rotor, the windings are dispersedly connected to the inner wall of the fixing ring and extend towards one end of the center shaft, and copper wires connected with the circuit board and used for conducting are wound around the windings. And cold air introduced from the channel can be dispersed into the hood and exchanges heat with internal heat, so that the temperature in the hood can be quickly reduced, and the heat dissipation effect is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to motor technical field, concretely is a kind of direct current brushless motor. BACKGROUND

[0002] In the design and application of direct current brushless motor, the heat dissipation problem has been one of the key factors affecting the performance and life of motor. The traditional direct current brushless motor structure usually includes a housing, a rotor and a stator, wherein the housing mainly plays a protection and support role, and the rotor and the stator are the core components of the motor operation. However, with the increase of motor power and the extension of operation time, the heat generated inside the motor also increases, which will lead to the increase of motor temperature, and then cause a series of problems such as insulation material aging and winding burning, which seriously affects the reliability and service life of the motor.

[0003] However, in order to solve the above problems, various heat dissipation measures are adopted in the prior art, such as increasing the number of heat dissipation fins and using materials with better heat conductivity. However, these methods often have limitations such as low heat dissipation efficiency, increased cost or complex structure. Especially in some application scenarios with strict requirements on the size and weight of the motor, the traditional heat dissipation scheme often fails to meet the requirements, which not only increases the size and weight of the motor, but also increases the manufacturing cost and complexity. SUMMARY

[0004] In order to overcome the shortcomings of the prior art, the utility model provides a direct current brushless motor, which can effectively solve the poor heat dissipation problem of the current brushless motor.

[0005] The utility model solves the technical problems by adopting the following technical scheme:

[0006] A direct current brushless motor, comprising a housing, a rotor and a stator, wherein the housing is composed of a base and a cover, the top surface of the base is provided with a boss, the top surface of the boss is provided with a circuit board, the side surface of the boss is provided with at least two channels communicated with the bottom of the base, the bottom of the base is provided with an air guide interface connected with the opening of the channel, and the cover is provided with at least two heat dissipation holes.

[0007] The rotor is composed of a rotating shaft and an iron core, one end of the rotating shaft is inserted into the top surface of the boss, and the other end extends outward through the top of the cover, the iron core is in the shape of a ring and is fixed coaxially on the outside of the rotating shaft.

[0008] The stator is composed of a fixing ring and a plurality of windings, the fixing ring is fixed tightly against the inner wall of the cover and is arranged coaxially with the rotor, the windings are connected to the inner wall of the fixing ring and extend to one end of the central axis, and the windings are wound with copper wires connected to the circuit board for conducting electricity.

[0009] Further, the base is provided with a clamping groove on the outside for fixed insertion with the cover.

[0010] Further, the base and the cover are connected with a clamping fixing part.

[0011] Further, the top surface of the base is provided with a groove, and the convex platform is arranged at the bottom of the groove.

[0012] Further, the top surface of the convex platform is provided with at least two protruding connecting columns, the middle part of the circuit board is hollowed out, and the bottom is fixed with the connecting columns.

[0013] Further, the bottom of the base is further provided with an electricity connection port connected with the circuit board.

[0014] Further, the inner wall of the cover is provided with a stator fixing groove for clamping and fixing the fixing ring.

[0015] Further, the fixing ring is integrally connected with the winding.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] The utility model discloses a channel for entering cold air is arranged at one end of the cover base of the machine cover, the cold air can be dispersed into the machine cover, and can exchange heat with the internal heat, so that the temperature inside the machine cover can be quickly reduced, and the heat dissipation effect of the motor is improved. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is the whole structure top schematic view of this embodiment;

[0019] Figure 2 It is the whole structure bottom schematic view of this embodiment;

[0020] Figure 3 It is the base and rotor connecting structure schematic view of this embodiment;

[0021] Figure 4 It is the internal structure schematic view of the base of this embodiment;

[0022] Figure 5 It is the cover and stator connecting structure schematic view of this embodiment;

[0023] Figure 6 It is the internal structure schematic view of the cover of this embodiment;

[0024] Mark in drawing:

[0025] 1-machine cover, 2-rotor, 3-stator, 4-convex platform, 5-circuit board, 6-channel, 7- air guide interface, 8-heat dissipation hole, 9-copper wire, 10-clamping groove, 11-clamping fixing part, 12-groove, 13-connecting column, 14-electricity connection port, 15-stator fixing groove;

[0026] 101-base, 102-cover.

[0027] 201 - Rotating shaft, 202 - Iron core;

[0028] 301 - Fixed ring, 302 - Winding. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] like Figures 1-6 As shown, this utility model provides a DC brushless motor, which is mainly used in a power motor. Its specific structure mainly consists of three parts: a housing 1, a rotor 2, and a stator 3. The housing 1 is the outer shell of the motor, which plays a certain role in protecting the internal rotor 2 and stator 3. The rotor 2 and stator 3 are located inside the housing 1 to form a power drive.

[0031] The housing 1 consists of a base 101 and a cover 102. The cover 102 has an open bottom and, when connected to the base 101, forms an internal cavity structure. The rotor 2 and stator 3 operate within this cavity. The base 101 and cover 102 are connected by an interlocking method. A slot 10 is provided on the outer side of the base 101 for interlocking and fixing with the cover 102. This slot 10 is coaxial with the base 101. To prevent the base 101 from detaching after connection, a reinforcing locking part 11 is provided at the connection point. This locking part 11 includes a circular groove on the outer side of the slot 10 and a circular protrusion on the inner side of the cover 102. During connection, the circular protrusion slides down and locks into the circular groove for fixation.

[0032] A boss 4 is arranged on the top surface of the base 101. The boss 4 is used not only for inserting and supporting the rotor 2, but also for introducing cold air into the inside of the cover 1 to facilitate internal cooling. In order not to directly affect the performance of the rotor 2 and the stator 3, the cold air is introduced to the side surface of the boss 4, and the cold air is provided by an external air supply device. A guide air interface 7 is arranged on the bottom of the base 101 to connect with the external air supply device. The cold air entering from the guide air interface 7 flows through the internal channel 6 to the side surface of the boss 4 and then enters the cover 1. At this time, the air outlet is dispersed on the side surface, reducing the impact of the wind on the rotor 2 and the stator 3. The cover 102 is provided with a heat dissipation hole 8 to discharge internal heat. It should be noted that due to the limited internal space of the cover 1, the user needs to adjust the speed of the entering cold air according to the internal pressure and the speed of heat dissipation.

[0033] In order to reduce the blowing of cold air to the position where the base 101 and the cover 102 are connected, and to reduce the cold air at the connection between the base 101 and the cover 102, a groove 12 is arranged on the top surface of the base 101, and the boss 4 is arranged at the bottom of the groove 12. At this time, when the cold air is introduced, the air outlet blows towards the inner wall of the groove 12.

[0034] A circuit board 5 is arranged on the top surface of the boss 4. The circuit board 5 can control the power supply of the brushless motor. Meanwhile, a power connection port 14 is arranged on the bottom of the base 101 to connect with the circuit board 5. The circuit board 5 is fixed on the top surface of the boss 4, and four connection columns 13 protruding from the surface of the boss 4 are arranged between the boss 4 and the circuit board 5. After the circuit board 5 is placed, the circuit board 5 and the connection columns 13 are locked by screws. Moreover, the bottom of the circuit board 5 is supported by the connection columns 13, so that the cold air can enter the bottom of the circuit board 5 to quickly cool the circuit board 5. In order not to affect the connection of the rotor 2 to one end of the base 101, the middle part of the circuit board 5 is hollowed out.

[0035] The rotor 2 mainly consists of a rotating shaft 201 and an iron core 202. When connected, one end of the rotating shaft 201 is inserted into the top surface of the boss 4, and the other end extends outward through the top of the cover 102. A groove is arranged on the top surface of the boss 4 to place the rotating shaft 201, and the end extending outward from the cover 102 is provided with a connection boss for easy fixing and connection. In addition, the iron core 202 is in the form of a circular ring and is coaxially fixed outside the rotating shaft 201. The iron core 202 can be a detachable structure on the surface of the rotating shaft 201.

[0036] The stator 3 is connected to the inner wall of the cover 102, and a stator fixing groove 15 for fixing the stator 3 is arranged on the inner wall of the cover 102. The stator 3 mainly comprises a fixing ring 301 and a plurality of windings 302, the fixing ring 301 is arranged in the stator fixing groove 15 for fixation, and the plurality of windings 302 are annularly distributed on the inner wall of the fixing ring 301 and extend to the direction of the central shaft at the other end, and the windings 302 after annular distribution are coaxially arranged with the rotor 2. The winding 302 and the fixing ring 301 are integrally connected, and the winding 302 is wound with a copper wire 9, and the two ends of the copper wire 9 are connected with the circuit board 5 and conduct electricity.

[0037] Compared with the prior art, the technical scheme sets the channel 6 for entering cold air at one end of the base 101 of the machine cover 1, the cold air entering the channel 6 can be dispersed into the machine cover 1 and can exchange heat with the internal heat, so that the temperature inside the machine cover 1 can be quickly reduced, and the heat dissipation effect of the motor is improved.

[0038] It is obvious for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and the present application can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting, the scope of the present application is defined by the appended claims rather than the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims should be included in the present application, and any reference signs in the claims should not be regarded as limiting the claims.

Claims

1. A brushless DC motor comprising a housing, a rotor and a stator, characterised in that: The cover is composed of a base and a cover body, the top surface of the base is provided with a boss, the top surface of the boss is provided with a circuit board, the side surface of the boss is provided with at least two channels communicated with the bottom of the base, the bottom of the base is provided with a wind guide interface connected with the opening of the channel, and the cover body is provided with at least two heat dissipation holes. The rotor is composed of a rotating shaft and an iron core, one end of the rotating shaft is inserted into the top surface of the boss, the other end of the rotating shaft extends outward through the top of the cover body, the iron core is in the shape of a ring and is coaxially fixed outside the rotating shaft. The stator is composed of a fixing ring and a plurality of windings, the fixing ring is fixed close to the inner wall of the cover body and is coaxially arranged with the rotor, the windings are dispersedly connected to the inner wall of the fixing ring and extend to one end of the central shaft, and the windings are wound with copper wires connected with the circuit board for conducting electricity.

2. A brushless DC motor according to claim 1, characterized in that: The outer side of the base is provided with a clamping groove fixed with the cover body.

3. A brushless DC motor according to claim 1 or 2, characterised in that: The connecting part of the base and the cover body is provided with a clamping fixing part.

4. A brushless DC motor as claimed in claim 1, characterized in that: The top surface of the base is provided with a groove, and the boss is arranged at the bottom of the groove.

5. A brushless DC motor as claimed in claim 1, characterized in that: The top surface of the boss is provided with at least two protruding connecting columns, the middle part of the circuit board is hollowed out, and the bottom is fixed with the connecting columns.

6. A brushless DC motor as claimed in claim 1 or 4, characterized in that: The bottom of the base is further provided with an electricity connection port connected with the circuit board.

7. A brushless DC motor as claimed in claim 1, characterized in that: The inner wall of the cover body is provided with a stator fixing groove for clamping and fixing the fixing ring.

8. A brushless DC motor as claimed in claim 1, characterized in that: The fixing ring is integrally connected with the winding.

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