CN212695882U

CN212695882U - Brushless motor

Info

Publication number: CN212695882U
Application number: CN202021832959.9U
Authority: CN
Inventors: 唐雷
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-08-28
Filing date: 2020-08-28
Publication date: 2021-03-12
Anticipated expiration: 2030-08-28

Abstract

The utility model relates to the electrical field, in particular to a brushless motor; the brushless motor belongs to an outer rotor motor and comprises a cup-shaped rotor, a stator and a sensor; the sensor PCB is pressed on the electric wire; meanwhile, the rotor is used as a fixing structure of the electric wire, so that the rotor is prevented from rubbing the electric wire; the parts are integrated, the number is small, the protection of the whole machine is good, and the reliability is high.

Description

Brushless motor

Technical Field

The utility model relates to an electric field, in particular to brushless motor.

Background

The existing outer rotor brushless motor, wires and small current are generally welded on a sensor PCB, and the current of an armature is led out from the PCB; when the current is large, the wire needs to be fixed in a separate structure.

Disclosure of Invention

The utility model mainly aims at improving the prior art, the brushless motor belongs to an external rotor motor, and a sensor PCB of the brushless motor is pressed on a power line; meanwhile, the rotor is used as a fixing structure of the electric wire, so that the rotor is prevented from rubbing the electric wire; the base is used as the motor shell at the same time, so that the rotor is protected. The brushless motor has the advantages of part integration, small quantity, good complete machine protection and high reliability.

Preferably, the brushless motor belongs to an outer rotor motor and comprises a rotor, a stator and a sensor; the stator comprises a base, an iron core, a winding, an electric wire and a bearing; the middle of the base is provided with a bearing chamber, and a bearing is fixed in the bearing chamber; an iron core is fixed outside the bearing chamber; the iron core is cylindrical, a plurality of grooves are formed in the outer circle of the iron core, windings are embedded in the grooves, and the electric wire is connected with the windings; the rotor is cup-shaped, and a shaft is arranged in the middle of the rotor; the rotor cup body is sleeved outside the armature and has a gap with the armature; the shaft penetrates through the inner hole of the bearing and is movably fixed; the bottom of the base is provided with a sensor; a space is arranged between the sensor and the base, and the electric wire part is arranged in the space and is covered and fixed by the sensor.

Preferably, the rotor comprises an end cap, a housing, a magnet, a shaft; the end cover is disc-shaped, the shaft is cylindrical, and the shaft is fixed in the center of the end cover; the shell is cylindrical and is fixed on the outer edge of the end cover; the magnets are strip-shaped, a plurality of magnets are fixed on the inner wall of the shell, and the magnets are arranged in a staggered mode according to N, S magnetic poles; the shaft of the rotor passes through the inner hole of the bearing and is movably fixed, and the cup body part of the rotor comprises a machine shell and a magnet which are embedded in the annular groove of the stator, and a gap is reserved between the inner circle and the outer circle.

Preferably, the rotor comprises an end cap, a housing, a magnet, a shaft; the end cover is disc-shaped, the shaft is cylindrical, and the shaft is fixed in the center of the end cover; the shell is cylindrical and is fixed on the outer edge of the end cover; the magnet is a ring-shaped multi-pole permanent magnet, the inner wall of the magnet is provided with a plurality of magnetic poles, the magnetic poles are arranged in a staggered mode according to N, S poles, and the magnet is fixed on the inner wall of the shell; the shaft passes through an inner hole of the bearing and is movably fixed; the cup body part of the rotor comprises a shell and a magnet, is embedded in the annular groove of the stator, and has a gap between the inner circle and the outer circle.

Preferably, the base is cup-shaped with a bearing chamber in the middle; a bearing is fixed in the bearing chamber; an iron core is fixed outside the bearing chamber; an annular groove is arranged between the iron core and the outer wall of the base.

Preferably, the bottom of the base is provided with a hole, and the electric wire penetrates through the hole.

Drawings

Fig. 1 is a front view of a brushless motor according to an embodiment of the present invention.

Fig. 2 is a plan view of a brushless motor according to an embodiment of the present invention.

Fig. 3 is a sectional view of a brushless motor according to an embodiment of the present invention.

Fig. 4 is a schematic diagram illustrating the separation of the stator and the rotor of the brushless motor according to the embodiment of the present invention.

Fig. 5 is a sectional view of a brushless motor according to an embodiment of the present invention.

Fig. 6 is an exploded view of a brushless motor according to an embodiment of the present invention.

Detailed Description

In order to make the method of the present invention clearer and more clear, the following detailed description will be made with reference to the following embodiments and accompanying drawings:

example, as shown in fig. 1-6: the brushless motor comprises a stator 11, a rotor 12, a rear cover 06, a sensor 32 and the like.

The stator 11 comprises a core 111, a winding 112, a base 114, a bearing 113 and a sensor 32; the base 114 is cup-shaped with a bearing chamber in the middle; the bearing chamber is cylindrical, and 3 bearings 113 are fixed inside the bearing chamber; an iron core 111 is fixed outside the bearing chamber; the iron core 111 is made of a magnetic silicon steel sheet and is cylindrical, 24 grooves are formed in the outer wall of the iron core 111, 24 windings 112 are fixed, and the windings 112 are conductive enameled wires; the bottom of the base 114 is provided with a small hole, and an electric wire 11201 connected with the winding 112 is led out from the small hole.

Rotor 12 includes end cap 12002, casing 121, magnets 122, shaft 12001; the rotor 12 is also generally cup-shaped; the end cover 12002 is disc-shaped, and the shaft 12001 is cylindrical and fixed in the center of the end cover 12002; the casing 121 is made of a magnetic conductive steel pipe, is cylindrical, and is fixed to the outer edge of the end cover 12002; the magnet 122 is made of permanent magnets and is in a strip shape, 28 pieces of magnets 122 are fixed on the inner wall of the casing 121, and the 28 pieces of magnets 122 are arranged in a staggered mode according to the magnetic poles N, S; the shaft 12001 of the rotor 12 passes through the inner hole of the bearing 113 and is movably fixed; the rotor 12 cup wall part comprises a casing 121 and a magnet 122 embedded in the annular groove of the stator 11, and a gap is reserved between the inner circle and the outer circle; the rotor 12 is supported by a bearing 113 for rotational movement.

The sensor 32 is arranged at the bottom of the base 114 and fixed on the base 114 by a screw 3201, and the sensor 32 is provided with a hall element which can sense the magnetic field of the magnet 122 on the rotor 12 and determine the rotation angle of the rotor 12; a groove is formed between the sensor 32 and the bottom surface of the base 114, and the electric wire 11201 connected with the winding 112 of the stator 11 is arranged in the groove and is covered and fixed by the sensor 32, so that the rotor 12 cannot rub the electric wire 11201 connected with the winding 112.

A rear cover 06 is fixed to the mouth of the cup body of the base 114 to protect the rotor 12.

The brushless motor of the present embodiment has a large output torque as an outer rotor motor.

The base 114 serves to fix the bearing 113, fix the iron core 111, and protect the rotor 12 from the outside.

The sensor 32 simultaneously functions to determine the rotation angle of the rotor 12 and to cover the electric wire 11201 connected to the stationary winding 112.

The above only is the preferred embodiment of the present invention, not limiting the scope of the present invention, all the equivalent structural changes made by the contents of the specification and the drawings, or the direct or indirect application in other related technical fields, are included in the same way in the protection scope of the present invention.

Claims

1. Brushless motor belongs to external rotor electric machine, its characterized in that: comprises a rotor, a stator and a sensor; the stator comprises a base, an iron core, a winding, an electric wire and a bearing; the middle of the base is provided with a bearing chamber, and a bearing is fixed in the bearing chamber; an iron core is fixed outside the bearing chamber; the iron core is cylindrical, a plurality of grooves are formed in the outer circle of the iron core, windings are embedded in the grooves, and the electric wire is connected with the windings; the rotor is cup-shaped, and a shaft is arranged in the middle of the rotor; the rotor cup body is sleeved outside the armature and has a gap with the armature; the shaft penetrates through the inner hole of the bearing and is movably fixed; the bottom of the base is provided with a sensor; a space is arranged between the sensor and the base, and the electric wire part is arranged in the space and is covered and fixed by the sensor.

2. The brushless electric machine according to claim 1, wherein: the rotor comprises an end cover, a shell, a magnet and a shaft; the end cover is disc-shaped, the shaft is cylindrical, and the shaft is fixed in the center of the end cover; the shell is cylindrical and is fixed on the outer edge of the end cover; the magnets are strip-shaped, a plurality of magnets are fixed on the inner wall of the shell, and the magnets are arranged in a staggered mode according to the magnetic poles N, S; the shaft of the rotor passes through the inner hole of the bearing and is movably fixed, and the cup body part of the rotor comprises a machine shell and a magnet which are embedded in the annular groove of the stator, and a gap is reserved between the inner circle and the outer circle.

3. The brushless electric machine according to claim 1, wherein: the rotor comprises an end cover, a shell, a magnet and a shaft; 3. the end cover is disc-shaped, the shaft is cylindrical, and the shaft is fixed in the center of the end cover; the shell is cylindrical and is fixed on the outer edge of the end cover; the magnet is a ring-shaped multi-pole permanent magnet, the inner wall of the magnet is provided with a plurality of magnetic poles, the magnetic poles are arranged in a staggered mode according to N, S poles, and the magnet is fixed on the inner wall of the shell; the shaft passes through an inner hole of the bearing and is movably fixed; the cup body part of the rotor comprises a shell and a magnet, is embedded in the annular groove of the stator, and has a gap between the inner circle and the outer circle.

4. The brushless motor according to claim 2 or 3, wherein: the base is cup-shaped, and the middle part of the base is a bearing chamber; a bearing is fixed in the bearing chamber; an iron core is fixed outside the bearing chamber; an annular groove is arranged between the iron core and the outer wall of the base.

5. The brushless electric machine of claim 4, wherein: the bottom of the base is provided with a hole, and the electric wire penetrates through the hole.