CN214380538U

CN214380538U - Brushless motor

Info

Publication number: CN214380538U
Application number: CN202120556555.XU
Authority: CN
Inventors: 陈永达; 宿谷玲; 鲁德华
Original assignee: Valley Wood Electrical Shenzhen Co Ltd
Current assignee: Valley Wood Electrical Shenzhen Co Ltd
Priority date: 2021-03-17
Filing date: 2021-03-17
Publication date: 2021-10-08
Anticipated expiration: 2031-03-17

Abstract

The utility model discloses a brushless motor, which comprises a housing, an installation electric motor rotor in the casing, install a cylindric magnet on the rotor, motor stator is installed to cylindric magnet inboard, cylindric magnet medial surface with be equipped with the clearance between the motor stator, a circuit board that is used for the whole work of control motor is still installed to the chassis bottom, install at least one hall sensor who is used for detecting the magnetic pole change on the circuit board, hall sensor locates cylindric magnet below, just hall sensor is located on the extension line of cylindric magnet medial surface. The utility model discloses technical scheme improves hall sensor's mounting means, simplifies the structure of motor.

Description

Brushless motor

Technical Field

The utility model relates to the technical field of motors, in particular to brushless motor.

Background

The existing brushless motor senses the change of magnetic poles through the Hall sensor, so as to control the motor, the installation mode of the Hall sensor is divided into two types, and firstly, the Hall sensor is installed on the inclined base to accurately detect the change of the magnetic poles. However, in order to mount the hall sensor on the inclined circuit board, a dedicated mounting base is required, and thus the structure becomes complicated. Second, the brushless motor forms a magnetic flux inducing portion at a portion of the core, and the magnetic flux inducing portion is directed to the hall sensor, so that the change of the magnetic pole can be accurately detected. In this case, a part of the core is a special member, and the structure of the core becomes complicated.

Accordingly, the prior art is deficient and needs improvement.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a brushless motor aims at improving hall sensor's mounting means, makes hall sensor can accurately detect the change of magnetic pole and switches over the circular telegram direction of coil so that the rotor rotates steadily, simplifies the structure of motor.

In order to achieve the above object, the utility model provides a brushless motor, which comprises a housing, an installation electric motor rotor in the casing, install a cylindric magnet on the rotor, motor stator is installed to cylindric magnet inboard, cylindric magnet medial surface with be equipped with the clearance between the motor stator, a circuit board that is used for the whole work of control motor is still installed to the chassis bottom, install at least one hall sensor who is used for detecting the magnetic pole change on the circuit board, hall sensor locates cylindric magnet below, just hall sensor is located on the extension line of cylindric magnet medial surface.

Preferably, the rotation center of the motor rotor is arranged at the axis of the casing.

Preferably, a cylindrical mounting groove protrudes from the center of the bottom of the casing, and a rotating shaft is arranged at the center of the motor rotor and is mounted in the cylindrical mounting groove through a bearing.

Preferably, the motor stator is radially arranged and comprises a plurality of iron cores and coils wrapped outside the iron cores.

Preferably, a metal ring made of magnetic material for supporting the cylindrical magnet is further provided on the motor rotor.

Preferably, a plurality of magnets with alternating magnetic poles are arranged on the inner side wall of the cylindrical magnet side by side.

Compared with the prior art, the beneficial effects of the utility model are that: the installation mode of the Hall sensor is improved, the Hall sensor is directly installed on the circuit board below the cylindrical magnet, the Hall sensor is located on the extension line of the inner side face of the cylindrical magnet, the density of the magnetic line of force at the position is highest, the magnetic line of force is vertically injected from the upper side of the Hall sensor, the Hall sensor can conveniently, quickly and efficiently accept the change of the magnetic pole, and therefore corresponding signals are sent to the circuit board, the electrifying direction of the coil is controlled, the stable rotation of the motor rotor is guaranteed, the structure of the brushless motor is greatly simplified, and the stability of the rotation of the brushless motor is guaranteed.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a schematic diagram of the Hall sensor of the present invention;

fig. 2 is a sectional view of the structure of the brushless motor of the present invention;

FIG. 3 is a schematic diagram of the position relationship between the cylindrical magnet and the Hall sensor of the present invention;

fig. 4 is a schematic diagram of the output waveform of the hall sensor of the present invention;

the objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.

Detailed Description

The brushless motor that this embodiment provided, refer to fig. 2, including a casing 1, an installation motor rotor 2 in the casing 1, install a cylindric magnet 3 on the rotor, motor stator is installed to 3 inboards of cylindric magnet, 3 medial surfaces of cylindric magnet with be equipped with the clearance between the motor stator, a circuit board 5 that is used for controlling the whole work of motor is still installed to casing 1 bottom, install at least one hall sensor 6 that is used for detecting the magnetic pole change on the circuit board 5, hall sensor 6 locates 3 belows of cylindric magnet, just hall sensor 6 is located on the extension line of 3 medial surfaces of cylindric magnet.

It should be noted that, in this embodiment, the installation manner of the hall sensor 6 is improved, the hall sensor 6 is directly installed on the circuit board 5 below the cylindrical magnet 3, and the hall sensor 6 is located on the extension line of the inner side surface of the cylindrical magnet 3, the density of the magnetic line of force at this position is the highest, and the magnetic line of force is vertically injected from above the hall sensor 6, so that the hall sensor 6 can conveniently, quickly and efficiently accept the change of the magnetic pole, thereby sending a corresponding signal to the circuit board 5, controlling the energization direction of the coil 42, ensuring the stable rotation of the motor rotor 2, greatly simplifying the structure of the brushless motor, and ensuring the stability of the rotation thereof. Referring to fig. 1, in the present embodiment, a magnetic detection point 61 for magnetic pole detection is provided at the center of the hall sensor 6, and when the magnetic detection point 61 detects that the magnetic lines of force above the hall sensor 6 in the vertical direction alternate, the hall sensor 6 sends a signal according to the change of the magnetic pole.

Referring to fig. 3, in the present embodiment, the inner side surface of the cylindrical magnet 3 is an N pole, the outer side surface is an S pole, the end surface of the cylindrical magnet forms magnetic lines bridging two magnetic poles, and the magnetic lines have the highest density at the portion where the end surface and the inner side surface of the cylindrical magnet 3 are connected. And the magnetic flux is injected substantially from the vertical direction of the upper surface of the hall sensor 6. Thus, the hall sensor 6 receives the magnetic force lines in the vertical direction from the upper surface thereof, and outputs a rectangular output waveform as shown in fig. 4, and the circuit board 5 controls the direction of energization of the switching coil 42 to stably rotate the motor rotor 2.

Further, the rotation center of the motor rotor 2 is located at the axis of the housing 1. The center of the bottom of the machine shell 1 protrudes out of a cylindrical mounting groove 11, the center of the motor rotor 2 is provided with a rotating shaft 21, and the rotating shaft 21 is mounted in the cylindrical mounting groove 11 through a bearing 22, so that the rotating stability of the motor rotor 2 is ensured.

Further, the motor stator is radially disposed and includes a plurality of iron cores 41 and coils 42 wrapped outside the iron cores 41.

Further, a magnetic material metal ring 7 for supporting the cylindrical magnet 3 is further arranged on the motor rotor 2, so that the installation stability of the cylindrical magnet 3 is ensured.

Further, a plurality of magnets having magnetic poles alternately arranged are provided in parallel on the inner side wall of the cylindrical magnet 3.

It should be noted that the magnetic detection point 61 of the hall sensor 6 may be located below the outer side surface of the cylindrical magnet. In the present embodiment, the radial motor stator formed by the plurality of cores 41 is fixed to the outer periphery of the cylindrical mounting groove 11, but a coreless 41 motor may be configured such that the motor stator is provided inside the outer periphery of the housing 1 and a cylindrical magnet is provided on the side surface of the motor rotor 2.

The above is only the preferred embodiment of the present invention, and not the scope of the present invention, all the equivalent structures or equivalent flow 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 patent protection scope of the present invention.

Claims

1. The utility model provides a brushless motor, its characterized in that, includes a casing, an installation electric motor rotor in the casing, install a cylindric magnet on the rotor, motor stator is installed to cylindric magnet inboard, cylindric magnet medial surface with be equipped with the clearance between the motor stator, chassis bottom still installs a circuit board that is used for the whole work of control motor, install at least one hall sensor who is used for detecting the magnetic pole change on the circuit board, hall sensor locates cylindric magnet below, just hall sensor is located on the extension line of cylindric magnet medial surface.

2. The brushless motor of claim 1, wherein a rotation center of the motor rotor is located at a shaft center of the housing.

3. The brushless motor of claim 2, wherein a cylindrical mounting groove is projected from a center of a bottom of the housing, and a rotation shaft is centrally provided in the motor rotor, and the rotation shaft is mounted in the cylindrical mounting groove by a bearing.

4. The brushless motor of claim 1, wherein the motor stator is radially disposed and includes a plurality of cores and coils wound around the cores.

5. The brushless motor of claim 1, wherein a metal ring of magnetic material for supporting the cylindrical magnet is further provided on the motor rotor.

6. The brushless motor of claim 1, wherein a plurality of magnets having magnetic poles alternately arranged are arranged side by side on an inner wall of the cylindrical magnet.