CN210669785U - Brushless motor - Google Patents

Abstract

A brushless motor comprises a shell, a stator assembly, a rotor assembly, a wind blocking ring and fan blades, wherein the stator assembly is installed in the shell, an insulating layer is injected in winding slots of a stator core, an isolating layer is arranged between each winding slot and an inner cavity of the stator assembly, a front annular boss and a rear annular boss which are coaxial with the stator core are arranged at the front end and the rear end of the inner cavity of the stator assembly respectively, and the isolating layers are simultaneously formed by injection molding with the front annular boss and the rear annular boss; a dustproof sealing area is defined by the fan blades, the wind shield ring, the front annular boss, the stator core, the rear annular boss and the bearing chamber. The utility model provides a brushless motor can not make dust or debris enter into stator inner chamber and rotor operation district in, dustproof, and long service life makes magnet steel and hall sensor also can reach dirt-proof effect simultaneously.

Description

Brushless motor

Technical Field

The utility model relates to a brushless motor.

Background

Dust or sundries and the like in the rotating process of the existing brushless motor enter the inner cavity of the stator and the running area of the rotor, so that the dust cannot be prevented, the service life of the motor is influenced, and meanwhile, the magnetic steel and the Hall sensor in the bearing chamber cannot achieve the dust-proof effect.

Disclosure of Invention

In order to overcome the defect that prior art exists, the utility model provides a brushless motor can not make dust or debris enter into stator inner chamber and rotor operation district in, dustproof, long service life makes magnet steel and hall sensor also can reach dirt-proof effect simultaneously.

The utility model provides a technical scheme that its technical problem adopted is:

a brushless motor comprises a shell, a stator assembly, a rotor assembly, a wind-blocking ring and fan blades, wherein the stator assembly is installed in the shell, the rotor assembly is located in the stator assembly, the stator assembly comprises a stator core and a stator winding, the fan blades are arranged at the front end of a motor shaft of the rotor assembly, the wind-blocking ring is arranged between the fan blades and the stator assembly, the rear end of the motor shaft of the rotor assembly extends into a bearing chamber and is installed in the bearing chamber through a bearing, an insulating layer is injected in winding slots of the stator core, an isolating layer is arranged between each winding slot and an inner cavity of the stator assembly, a front annular boss and a rear annular boss which are coaxial with the stator core are respectively arranged at the front end and the rear end of the inner cavity of the stator assembly, and the isolating layers are simultaneously integrally injection-molded with the front annular boss and;

the front annular boss is tightly matched and connected with a spigot at the inner side of the wind-blocking ring, an annular groove is arranged at the outer side of the wind-blocking ring, the section of the annular groove is U-shaped, a circle of flange is arranged at the inner side of the fan blade, and the flange is just tightly inserted in the annular groove; the front end of the bearing chamber is provided with an annular step, the rear annular boss is tightly matched and connected with the annular step, and the magnetic steel and the Hall sensor are both arranged in the bearing chamber and are arranged on a motor shaft;

a dustproof sealing area is defined by the fan blades, the wind shield ring, the front annular boss, the stator core, the rear annular boss and the bearing chamber.

Further, the flange on the inner side of the fan blade is tightly connected with the annular groove through a sealing ring.

The beneficial effects of the utility model are that: dust or sundries cannot enter the inner cavity of the stator and the running area of the rotor, so that the stator is dustproof, the service life is long, and the magnetic steel and the Hall sensor can also achieve the dustproof effect.

Drawings

Fig. 1 is a cross-sectional view of the present invention.

Fig. 2 is a schematic structural view of the stator core after the first injection molding.

Fig. 3 is a cross-sectional view of fig. 2.

Fig. 4 is a cross-sectional view of fig. 2.

Fig. 5 is an external view of fig. 3.

Fig. 6 is a schematic structural view of the stator core after the second injection molding.

Fig. 7 is a cross-sectional view of fig. 6.

Fig. 8 is a cross-sectional view of fig. 6.

Fig. 9 is an external view of fig. 7.

Detailed Description

The present invention will be further described with reference to the accompanying drawings.

Referring to fig. 1 to 9, a brushless motor includes a housing 1, a stator assembly 2, a rotor assembly 3, a wind-blocking ring 4 and fan blades 5, the stator assembly 2 is installed in the housing 1, the rotor assembly 3 is located in the stator assembly 2, the stator assembly 2 includes a stator core 21 and a stator winding, the fan blades 5 are installed at the front end of a motor shaft 31 of the rotor assembly 3, the wind-blocking ring 4 is installed between the fan blades 5 and the stator assembly 2, the rear end of the motor shaft 31 of the rotor assembly 3 extends into a bearing chamber 7 and is installed in the bearing chamber 7 through a bearing 11, an insulating layer 211 is injection-molded in a winding slot of the stator core 21, an isolation layer 214 is respectively installed between each winding slot and an inner cavity of the stator assembly, a front annular boss 212 and a rear annular boss 213 coaxially installed with the stator core 21 are respectively installed at the front and rear ends of the inner cavity of the stator assembly, the isolation layer 214 and the front annular boss 212 and the rear, The rear annular boss 213 is integrally injection molded;

the front annular boss 212 is tightly matched and connected with a spigot at the inner side of the wind-shield ring 4, an annular groove is arranged at the outer side of the wind-shield ring 4, the section of the annular groove is U-shaped, and a circle of flange is arranged at the inner side of the fan blade 5 and is just tightly inserted in the annular groove; the front end of the bearing chamber 7 is provided with an annular step, the rear annular boss 213 is tightly matched and connected with the annular step, and the magnetic steel 8 and the Hall sensor 9 are both arranged in the bearing 11 chamber and are arranged on the motor shaft 31;

a dustproof sealing area is defined by the fan blades 5, the wind shield ring 4, the front annular boss, the stator core 21, the rear annular boss and the bearing chamber 7.

Further, a flange on the inner side of the fan blade 5 is tightly connected with the annular groove through a sealing ring.

The stator assembly of the utility model adopts twice injection molding, the first injection molding is as shown in figure 2, and a layer of insulating layer 211 is formed by injection molding in the winding slot of the stator core 21; the second shot isolates the winding slots from the stator assembly cavity, forming two separate areas, as shown in fig. 6.

As shown in fig. 1, 12 is a bearing installed at the front end of the motor shaft,

as shown in fig. 3, 13 is the stator winding and ventilation zone and 14 is the stator bore and rotor operating zone.

The rear annular boss 213 is matched with the bearing chamber 7 at the rear end of the machine shell to form a sealing structure, the front annular boss 212 is matched with the inner side seam allowance of the wind-blocking ring 4 to form a sealing structure, an annular groove is arranged on the wind-blocking ring 4, and the annular groove is matched with a circle of flanges on the fan blades 5 to form a labyrinth structure; therefore, in the process of the rotation operation of the motor, the air flow generated by the cooling of the motor and the dust and impurities mixed in the air flow can only flow in the stator winding and ventilation area 13 and can not enter the stator inner cavity and the rotor operation area 14, thereby achieving the purposes of preventing dust and prolonging the service life of the motor.

The bearing 11 at the rear end of the motor, the magnetic steel 8 at the rear part of the motor and the Hall sensor 9 are arranged in the cavity of the bearing chamber at the rear end of the machine shell, and the rear annular boss 213 is matched with the bearing chamber 7 at the rear end of the machine shell to form a sealing structure space, so that the bearing 11 at the rear end of the motor, the magnetic steel 8 at the rear part of the motor, the Hall sensor 9 and the like can achieve a good dustproof effect.

Claims (2)

1. The utility model provides a brushless motor, includes casing, stator assembly, rotor assembly, wind-break circle and fan blade, and the stator assembly is installed in the casing, the rotor assembly is located the stator assembly, the stator assembly includes stator core and stator winding, the front end of the motor shaft of rotor assembly is equipped with the fan blade, is equipped with the wind-break circle between fan blade and the stator assembly, the rear end of the motor shaft of rotor assembly stretches into in the bearing room and installs in the bearing room through the bearing, its characterized in that: an insulating layer is injected in the winding slots of the stator core, an isolating layer is arranged between each winding slot and the inner cavity of the stator assembly, a front annular boss and a rear annular boss which are coaxial with the stator core are respectively arranged at the front end and the rear end of the inner cavity of the stator assembly, and the isolating layers are simultaneously integrally injected with the front annular boss and the rear annular boss;

the front annular boss is tightly matched and connected with a spigot at the inner side of the wind-blocking ring, an annular groove is arranged at the outer side of the wind-blocking ring, the section of the annular groove is U-shaped, a circle of flange is arranged at the inner side of the fan blade, and the flange is just tightly inserted in the annular groove; the front end of the bearing chamber is provided with an annular step, the rear annular boss is tightly matched and connected with the annular step, and the magnetic steel and the Hall sensor are both arranged in the bearing chamber and are arranged on a motor shaft;

a dustproof sealing area is defined by the fan blades, the wind shield ring, the front annular boss, the stator core, the rear annular boss and the bearing chamber.

2. The brushless electric machine of claim 1, wherein: the flange on the inner side of the fan blade is tightly connected with the annular groove through a sealing ring.

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