Brushless outer rotor motor

Abstract

The utility model relates to a brushless external rotor motor, which comprises a stator part and a rotor part, the stator part comprises a bearing assembly, a winding stator, a circuit board assembly and an end cover, the rotor part comprises a rotor casing, a first magnetic ring and a second magnetic ring, and the winding stator is connected with the circuit board assembly through a connector. Compared with the prior art, the utility model has the advantages of solving the problems of wire breakage and insulation damage in a severe environment and the like.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of motors, in particular to a kind of brushless outer rotor motor. BACKGROUND

[0002] The winding stator of most brushless outer rotor motor in current industry and the connection scheme of circuit board assembly is using winding outlet and circuit board assembly direct welding scheme, this scheme has less parts, relatively low cost, process is relatively simple, so it is widely used in industrial product motor. However, this scheme also has some drawbacks: the line between winding outlet and circuit board assembly, in high-low temperature impact environment, easy to cause winding broken wire phenomenon, in random vibration environment, easy to cause line shaking broken wire or insulation damage phenomenon.

[0003] Therefore, how to develop a new winding and circuit board assembly connection technology, to solve the problem of broken wire and insulation damage in harsh environment. UTILITY MODEL CONTENT

[0004] The utility model discloses a kind of brushless outer rotor motors to overcome the defects of the prior art described above.

[0005] The utility model can be realized by the following technical solutions:

[0006] According to an aspect of the utility model, provide a kind of brushless outer rotor motor, including stator part and rotor part, the stator part includes bearing assembly, winding stator, circuit board assembly and end cover, the rotor part includes rotor shell, first magnetic ring and second magnetic ring, the winding stator is connected between circuit board assembly by connector.

[0007] As preferred technical solutions, the connector includes upper end face and lower end face, the upper end face is close to winding stator, and the lower end face is close to circuit board assembly.

[0008] As preferred technical solutions, the connector inner side is close to end cover or bearing assembly, and outer side is close to rotor part.

[0009] As preferred technical solutions, the connector includes insulating piece and pin, the pin is installed on insulating piece, one end of the pin is connected with winding outlet of winding stator, and the other end is connected with circuit board assembly;

[0010] The insulating piece isolates pin and end cover or bearing assembly, and the insulating piece isolates pin and rotor part simultaneously.

[0011] As preferred technical solutions, the side of the connector away from pin is provided with wire protection structure for surrounding winding common end of winding stator.

[0012] As a preferred technical scheme, the pin is a straight pin, a pin with a set angle or a C-shaped pin, and the pin is arranged uniformly or at an arbitrary angle on the insulating member.

[0013] As a preferred technical scheme, the pin is a cylindrical pin, a square pin or a flat pin.

[0014] As a preferred technical scheme, the connector is a circular ring structure, an arc structure or a rectangular structure.

[0015] As a preferred technical scheme, the winding stator comprises a stator core assembly, a winding and a winding outlet, the stator core assembly is provided with an insulating framework, steps are arranged at the upper and lower ends of the insulating framework, the inner side of the step is close to the bearing assembly, and the outer side of the step is close to the winding and the winding outlet, and the winding outlet is attached to the outer side of the step of the insulating framework.

[0016] As a preferred technical scheme, the bearing assembly comprises a bearing, a rotating shaft and a steel sleeve, the steel sleeve is provided with a bearing shoulder structure and a bearing chamber structure, a first glue storage groove structure is arranged on the outer diameter of the steel sleeve, the upper side of the outer diameter of the steel sleeve is fixed with the winding stator, and the lower side of the outer diameter of the steel sleeve is fixed with the inner hole of the end cover.

[0017] The rotating shaft is fixed with the rotor shell, and a second glue storage groove structure is arranged at the inner hole matched with the rotating shaft of the rotor shell.

[0018] Compared with the prior art, the utility model has the following advantages:

[0019] 1) the utility model discloses a connector mode to connect the winding stator and the circuit board assembly, and solves the problem of wire breakage and insulation damage in a harsh environment.

[0020] 2) the utility model discloses better safety, and the connector is close to the winding stator, but does not contact the winding portion of the winding stator, meanwhile, the insulating member is used to isolate the pin and the end cover or the bearing assembly, and to isolate the pin and the rotor portion, so that the safety is further improved.

[0021] 3) the utility model discloses better reliability, and the wire protection structure is designed on the side of the connector far from the pin, surrounds the common end of the winding, does not contact the end portion of the winding, and the reliability is further improved.

[0022] 4) the utility model discloses wide application range, and the connector is a circular ring structure, an arc structure or a rectangular structure or other structures that can achieve the same function, and the application range is further improved. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a whole sectional structure schematic view of the utility model;

[0024] Figure 2 It is an exploded structure schematic view of the utility model;

[0025] Figure 3 Figure 1 is a schematic diagram of a connector structure of the present application embodiment 1;

[0026] Figure 4(a) is a schematic diagram of a connector structure of the present application embodiment 2;

[0027] Figure 4(b) is a schematic diagram of a connector structure of the present application embodiment 2;

[0028] Figure 4(c) is a schematic diagram of a connector structure of the present application embodiment 2;

[0029] Figure 4(d) is a schematic diagram of a connector structure of the present application embodiment 2;

[0030] Wherein 1 is a rotor shell, 2 is a first magnetic steel, 3 is a second magnetic steel, 4 is a bearing assembly, 5 is a winding stator, 6 is a connector, 7 is a circuit board assembly, 8 is an end cover, 6.1 is an insulating piece, and 6.2 is a pin. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should belong to the scope of protection of the present application.

[0032] Embodiment 1

[0033] As shown in Figure 1 and Figure 2 A brushless outer rotor motor, comprising a stator part and a rotor part, the stator part comprising a bearing assembly 4, a winding stator 5, a circuit board assembly 7 and an end cover 8, the rotor part comprising a rotor shell 1, a first magnetic ring 2 and a second magnetic ring 3, the winding stator 5 and the circuit board assembly 7 being connected in circuit conduction through a connector 6. The present application adopts a connector to connect the winding stator and the circuit board assembly, solving the problems of wire breakage and insulation damage in harsh environments.

[0034] The connector has upper and lower end faces, the upper end face being close to the winding stator without contacting the winding portion of the winding stator, and the lower end face being close to the circuit board assembly and inserted into the circuit board assembly; and has inner and outer sides, the inner side being close to the end cover or the bearing assembly, and the outer side being close to the rotor part without contacting the rotor part.

[0035] As shown in Figure 3As shown, connector 6 is annular, comprising three pins 6.2 and a circular insulating component 6.1. The insulating component 6.1 supports the three pins, with the pins parallel to the axis of the insulating component, ensuring the relative position of the three pins. The upper ends of the three pins are respectively welded to the U, V, and W lines of the winding output power lines, and the lower ends are connected to the motor power lines on the circuit board assembly. The insulating component isolates the pins from the end cover or bearing assembly, and from the rotor. A wire protection structure is designed on the side of the connector away from the pins, wrapping around the common end of the winding and not contacting the winding end. Pins 6.2 can be straight pins, bent pins with a certain angle, or C-shaped pins. The lower end of pin 6.2 is connected to the circuit board assembly, and the upper end of pin 6.2 is connected to the winding output. The inner and outer sides of the annular connector isolate the winding output and pins from the bearing assembly and end cover boss.

[0036] The connector 6 has a wire protection structure on the side away from the pin, which wraps around the common terminal of the winding and does not contact the end of the winding.

[0037] The wound stator includes windings, winding leads, and stator core assembly. The stator core assembly is designed with an insulating frame. The insulating frame has steps extending from both the top and bottom. The steps have inner and outer sides. The inner side is close to the bearing assembly, and the outer side is close to the windings and winding leads. The insulating frame has two ends. The upper end faces upward and the lower end faces downward with winding leads. The winding leads are attached to the outer side of the insulating frame steps.

[0038] The bearing assembly includes two bearings, a shaft, a spring, a bushing, a washer, and a steel sleeve. The steel sleeve features a bearing shoulder structure and a bearing housing structure, and its outer diameter has a glue reservoir. The upper side of the steel sleeve's outer diameter is fixed to the wound stator, and the lower side is fixed to the inner hole of the end cover. The shaft is fixed to the rotor housing, and a glue reservoir is provided at the inner hole of the rotor housing where it mates with the shaft, securing the shaft and rotor housing. The washer features a shoulder structure and a protective spring structure. The washer shoulder contacts the inner ring of the lower bearing, the bottom of the washer cavity contacts the spring, the inner side of the outer cylindrical surface protects the spring, and the inner side of the inner cylindrical surface protects the spring from contacting the shaft. The washer can also be designed as a simplified U-shaped structure, providing the same protective function.

[0039] Example 2

[0040] like Figures 4(a) to 4(d) As shown, the connector in this utility model can also be arc-shaped or rectangular, including 3 pins and arc-shaped or rectangular insulating parts, pre-connected to the circuit board assembly as a whole, and assembled together with the circuit board assembly. The pins can be straight pins, bent pins with a certain angle, or C-shaped pins. The lower end of the pin is connected to the circuit board assembly, and the upper end of the pin is connected to the winding lead wire.

[0041] The connector can also be a circular ring type, comprising three pins and a circular ring type insulating part, the pins arranged on the circular ring can be uniformly distributed at 120° or arranged at any included angle, the pins can be cylindrical, square or flat; the connector is connected with the circuit board assembly in advance as a whole, and the pins can be straight pins, bent pins with a certain angle or C-shaped pins, the lower end of the pins is connected with the circuit board assembly, and the upper end of the pins is connected with winding outgoing wires.

[0042] The rest is the same as example 1.

[0043] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited to this, any skilled person in the art can easily think of various equivalent modifications or replacements within the technical range disclosed by the present application, and these modifications or replacements should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A brushless outer rotor motor comprising a stator part and a rotor part, said stator part comprising a bearing assembly (4), a wound stator (5), a circuit board assembly (7) and an end cap (8), said rotor part comprising a rotor housing (1), a first magnetic ring (2) and a second magnetic ring (3), characterized in that, The winding stator (5) is connected with the circuit board assembly (7) through the connector (6).

2. A brushless external rotor electric motor according to claim 1, characterized in that The connector (6) comprises an upper end surface and a lower end surface, the upper end surface is close to the winding stator (5), and the lower end surface is close to the circuit board assembly (7).

3. A brushless external rotor electric motor according to claim 1, wherein The inside of the connector (6) is close to the end cover (8) or the bearing assembly (4), and the outside is close to the rotor part.

4. A brushless external rotor electric motor as claimed in claim 1, wherein, The connector (6) comprises an insulating part (6.1) and a pin (6.2), the pin (6.2) is installed on the insulating part (6.1), one end of the pin (6.2) is connected with the winding outgoing terminal of the winding stator (5), and the other end is connected with the circuit board assembly (7). The insulating part (6.1) isolates the pin (6.2) from the end cover (8) or the bearing assembly (4), and simultaneously isolates the pin (6.2) from the rotor part.

5. A brushless external rotor electric motor as claimed in claim 4 wherein, The side of the connector (6) away from the pin (6.2) is provided with a wire protection structure for surrounding the winding common terminal of the winding stator (5).

6. A brushless external rotor electric motor as claimed in claim 4 wherein, The pin (6.2) is a straight pin, a bent pin with a set angle or a C-shaped pin, and the pin (6.2) is arranged at an equal angle or an arbitrary angle on the insulating part (6.1).

7. A brushless external rotor electric motor as claimed in claim 4 wherein, The pin (6.2) is cylindrical, square or flat.

8. A brushless external rotor electric motor as claimed in claim 4, wherein, The connector (6) is circular, arc or rectangular in structure.

9. A brushless external rotor electric motor as set forth in claim 1 wherein, The winding stator (5) comprises a stator core assembly, a winding and a winding outgoing terminal, the stator core assembly is provided with an insulating framework, the upper and lower ends of the insulating framework are provided with protruding steps, the inside of the step is close to the bearing assembly (4), and the outside is close to the winding and the winding outgoing terminal.

10. A brushless external rotor electric motor as set forth in claim 1 wherein, The bearing assembly (4) comprises a bearing, a shaft and a steel sleeve, the steel sleeve is provided with a bearing shoulder structure and a bearing chamber structure, the outer diameter of the steel sleeve is provided with a first glue storage groove structure, the upper side of the outer diameter of the steel sleeve is fixed with the winding stator (5), and the lower side of the outer diameter of the steel sleeve is fixed with the inner hole of the end cover (8). The shaft is fixed with the rotor shell (1), and the inner hole of the rotor shell (1) matched with the shaft is provided with a second glue storage groove structure.

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