CN216121958U

CN216121958U - Brushless DC motor for dental handpiece

Info

Publication number: CN216121958U
Application number: CN202122271649.5U
Authority: CN
Inventors: 李健军
Original assignee: Dongguan Zhonghanxin Motor Co ltd
Current assignee: Dongguan Zhonghanxin Motor Co ltd
Priority date: 2021-09-18
Filing date: 2021-09-18
Publication date: 2022-03-22
Anticipated expiration: 2031-09-18

Abstract

The utility model discloses a brushless direct current motor for a dental handpiece, which comprises an end cover group, a stator group and a rotor group, wherein the end cover group, the stator group and the rotor group are all revolving bodies, the rotor group is positioned in the stator group, one end of the end cover group is fixedly connected with one end of the stator group, the rotor group comprises a central shaft, the side wall of the central shaft is fixedly connected with magnetic steel, two ends of the magnetic steel are respectively provided with a balance block, the other side of the balance block is respectively provided with a gasket, and a pin hole is arranged on the central shaft in a penetrating way. In the utility model, the balance block is arranged, so that the weight of the balance block can be changed, the dynamic balance can be corrected and the quality of the motor can be improved in the production of the motor.

Description

Brushless DC motor for dental handpiece

Technical Field

The utility model relates to the field of motors, in particular to a brushless direct current motor for a dental handpiece.

Background

The motor is an electromagnetic device for realizing electric energy conversion or transmission according to an electromagnetic induction law. The motor is represented by a letter M in a circuit, and the motor mainly plays a role in generating driving torque and is used as a power source of electric appliances or various machines.

The application of the motor relates to various industries, and in the dental industry, a miniaturized high-rotation-speed motor is required. However, the existing motor is not provided with a part for correcting dynamic balance separately. The integrity of the rotor is improved when the rotor is substantially produced. However, the rotor produced by the method has low percent of pass, high production cost and poor dynamic balance of the motor.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the defects in the prior art, and provides a brushless direct current motor for a dental handpiece.

In order to achieve the purpose, the utility model adopts the following technical scheme: a brushless direct current motor for a dental handpiece comprises an end cover group, a stator group and a rotor group, wherein the end cover group, the stator group and the rotor group are all revolving bodies, the rotor group is positioned in the stator group, and one end of the end cover group is fixedly connected with one end of the stator group;

the rotor set comprises a central shaft, the side wall of the central shaft is fixedly connected with a magnetic steel, two ends of the magnetic steel are provided with balance blocks, and the other side of each balance block is provided with a gasket;

the central shaft is provided with a pin hole in a penetrating manner.

As a further description of the above technical solution:

and a spring is arranged on the side wall of one end of the central shaft, one end of the spring is propped against the gasket, and the other end of the spring is propped against the end cover group.

As a further description of the above technical solution:

the end cover group comprises a rear cover and a first bearing, and the first bearing is located in the middle of one side of the rear cover.

As a further description of the above technical solution:

the stator group comprises a shell, and an iron core is fixedly connected to the inner wall of the shell.

As a further description of the above technical solution:

the inner wall fixedly connected with coil of iron core, one side fixedly connected with circuit board of coil, circuit board and coil electric connection.

As a further description of the above technical solution:

and the middle part of one side of the shell is fixedly connected with a second bearing.

The utility model has the following beneficial effects:

1. the utility model is provided with the balance block, can cut the balance block, correct dynamic balance and improve the quality of the motor.

2. According to the utility model, the pin hole is formed in the central shaft, so that the connecting piece can be fixed, and slipping and power loss are avoided.

3. The utility model is provided with the spring, the rotor set can be axially buffered, and the motor has certain self-protection capability.

Drawings

Fig. 1 is a schematic overall structure diagram of a brushless dc motor for a dental handpiece according to the present invention;

fig. 2 is a schematic structural diagram of a rotor set for a brushless dc motor of a dental handpiece according to the present invention;

fig. 3 is a schematic structural diagram of an end cap assembly for a brushless dc motor of a dental handpiece according to the present invention;

fig. 4 is a schematic structural diagram of a stator assembly for a brushless dc motor of a dental handpiece according to the present invention.

Illustration of the drawings:

1. an end cap set; 11. a rear cover; 12. a first bearing; 2. a stator group; 21. a housing; 22. a circuit board; 23. an iron core; 24. a coil; 25. a second bearing; 3. a rotor set; 31. a central shaft; 32. a spring; 33. magnetic steel; 34. a counterbalance; 35. a gasket; 36. a pin hole.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance, and furthermore, unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 1-4, one embodiment of the present invention is provided: the utility model provides a be used for brushless DC motor of dental handpiece, including end cover group 1, stator group 2 and rotor group 3, end cover group 1, stator group 2 and rotor group 3 are the solid of revolution, rotor group 3 is located stator group 2's inside, the setting is rotated between rotor group 3 and the stator group 2, end cover group 1 and stator group 2's one end fixed connection, adopt the mode fixed connection of glue or screw between end cover group 1 and the stator group 2, can be at end cover group 1, stator group 2's lateral wall corresponds the screw hole that begins, during the equipment, use the screw to fix.

Rotor assembly 3 includes center pin 31, the lateral wall fixedly connected with magnet steel 33 of center pin 31, magnet steel 33's both ends all are provided with balancing piece 34, balancing piece 34 is used for setting up the dynamic balance of motor, after rotor assembly 3 equipment, dynamic balance's test can be carried out, if need rectify dynamic balance, can cut balance piece 34 and handle, if adopt drilling equipment to drill at the lateral wall or the terminal surface of balancing piece 34, realize rotor assembly 3's dynamic balance setting, balancing piece 34's opposite side all is provided with gasket 35, can prevent balancing piece 34 wearing and tearing.

The pin hole 36 is arranged on the central shaft 31 in a penetrating way, because the motor is used for a dental handpiece, and needs extremely high rotating speed, the output end of the traditional small motor basically adopts an interference fit mode and is connected with parts such as gears, but the slipping phenomenon of the output end of the motor and the gears is very easy to occur under high rotating speed, and the pin hole 36 is adopted here, so that the slipping of connecting pieces such as the gears can be avoided.

The one end lateral wall of center pin 31 is provided with spring 32, and the one end of spring 32 supports gasket 35, and the other end of spring 32 supports end cover group 1, sets up spring 32 for center pin 31 has the ability that has axial displacement, can avoid center pin 31 to cause the motor to damage when the skew takes place for the axial.

The end cover group 1 comprises a rear cover 11 and a first bearing 12, the first bearing 12 is located in the middle of one side of the rear cover 11, and due to the fact that the motor rotates at a high speed and a transmission bearing bush is not suitable, friction resistance can be reduced due to the fact that the bearing is adopted, meanwhile lubricating oil is sealed in the bearing, and the service life of the motor can be prolonged.

Stator assembly 2 includes casing 21, casing 21's inner wall fixedly connected with iron core 23, iron core 23's inner wall fixedly connected with coil 24, one side fixedly connected with circuit board 22 of coil 24,

circuit board

22 and 24 electric connection of coil, be provided with the electronic components who changes 24 circular telegram directions of coil on the circuit board 22, abandon and use traditional brush, all promote greatly on the clean degree of life and the long-time use of motor, one side middle part fixedly connected with second bearing 25 of casing 21, it is unanimous with first bearing 12's effect.

The working principle is as follows: during production of the present invention, the dynamic balance test can be performed on the rotor set 3 in advance, and the dynamic balance of the rotor set 3 can be corrected by changing the weight of the balance weight 34 through material removal.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the utility model.

Claims

1. The brushless direct current motor for the dental handpiece is characterized by comprising an end cover group (1), a stator group (2) and a rotor group (3), wherein the end cover group (1), the stator group (2) and the rotor group (3) are all revolving bodies, the rotor group (3) is positioned in the stator group (2), and one end of the end cover group (1) is fixedly connected with one end of the stator group (2);

the rotor set (3) comprises a central shaft (31), the side wall of the central shaft (31) is fixedly connected with a magnetic steel (33), two ends of the magnetic steel (33) are respectively provided with a balance block (34), and the other side of each balance block (34) is respectively provided with a gasket (35);

the central shaft (31) is provided with a pin hole (36) in a penetrating way.

2. A brushless dc motor for a dental handpiece according to claim 1, wherein: and a spring (32) is arranged on the side wall of one end of the central shaft (31), one end of the spring (32) is propped against the gasket (35), and the other end of the spring (32) is propped against the end cover group (1).

3. A brushless dc motor for a dental handpiece according to claim 1, wherein: the end cover group (1) comprises a rear cover (11) and a first bearing (12), and the first bearing (12) is located in the middle of one side of the rear cover (11).

4. A brushless dc motor for a dental handpiece according to claim 1, wherein: the stator group (2) comprises a shell (21), and an iron core (23) is fixedly connected to the inner wall of the shell (21).

5. A brushless DC motor for a dental handpiece according to claim 4, characterized in that: the inner wall fixedly connected with coil (24) of iron core (23), one side fixedly connected with circuit board (22) of coil (24), circuit board (22) and coil (24) electric connection.

6. A brushless DC motor for a dental handpiece according to claim 4, characterized in that: and the middle part of one side of the shell (21) is fixedly connected with a second bearing (25).