CN106953493B

CN106953493B - Brushless alternating current oscillation micro motor

Info

Publication number: CN106953493B
Application number: CN201710240362.1A
Authority: CN
Inventors: 吴美平
Original assignee: Zhuhai Sanjishi Health Technology Co ltd
Current assignee: Zhuhai Sanjishi Health Technology Co ltd
Priority date: 2017-04-13
Filing date: 2017-04-13
Publication date: 2023-06-20
Anticipated expiration: 2037-04-13
Also published as: CN106953493A; WO2018188284A1

Abstract

The invention discloses a brushless alternating current oscillation micro motor, which comprises a rotor, wherein the rotor comprises a shaft, a first iron core lamination and a second iron core lamination, wherein the first iron core lamination penetrates through the shaft; the stator comprises a coil penetrating through a shaft and positioned between the first iron core lamination and the second iron core lamination, and a first bar magnet, a second bar magnet, a third bar magnet and a fourth bar magnet which encircle the shaft, the coil, the first iron core lamination and the second iron core lamination. The magnets are the same type of magnets, the magnets are magnetized at two ends only, the middle of the magnets is not magnetized, the magnetizing direction is radial, the magnetism of the upper end and the lower end is opposite, and the magnets are arranged according to the principle that the polarities of adjacent magnets are opposite. The bottom cover is perforated to lead out the lead, and the counterweight is added to reduce the amplitude attenuation. The invention improves the assembly process and reduces the manufacturing cost; the brushless motor is used, so that the service life is prolonged; the amplitude is controlled according to the frequency of the driving, and the amplitude attenuation under the damping condition is reduced by adding the counterweight device.

Description

Brushless alternating current oscillation micro motor

Technical Field

The invention relates to the field of brushless motors, in particular to a brushless alternating current oscillating micro motor.

Background

At present, motors widely used in the market comprise brush motors and brushless motors, and the current of an input coil is switched by a common brush motor through a mechanical mode of a commutator and a brush, the current of the input coil is switched by the brush motor through the mechanical mode of the commutator and the brush, the rotating speed of the brush motor is relatively easy to control, but the mechanical running-in of the brush and the commutator tends to accelerate motor loss, so that the service life of the brush motor is not long, and noise is easy to generate.

The AC oscillating micro motor is a motor in which a motor shaft can swing reciprocally around an axle center at a certain angle after AC is supplied. Such micro-motors are widely used in the field of electric toothbrushes and the like. However, the motor has small motor amplitude at present, and particularly under the damping condition, the amplitude attenuation is large; the manufacturing process is complex and the production cost is high.

Therefore, a new motor structure with optimized motor amplitude-frequency characteristics is needed at present, and the amplitude can be controlled according to the driving frequency, so that a better application effect is achieved; the assembly process is improved, and the manufacturing cost is reduced; and a brushless motor is used, so that the service life is prolonged.

Disclosure of Invention

The invention aims to solve the technical problems, and provides a novel motor structure for realizing the optimization of motor amplitude-frequency characteristics of a brushless alternating current oscillation micro motor, wherein the amplitude can be controlled according to the driving frequency, so that a better application effect is achieved; the assembly process is improved, and the manufacturing cost is reduced; and the brushless motor is used for prolonging the service life.

In order to achieve the above object, the present invention provides a brushless ac oscillating micro motor comprising:

a rotor including a shaft, a first core stack and a second core stack passing through the shaft;

the stator comprises a coil penetrating through a shaft and positioned between the first iron core lamination and the second iron core lamination, and a first bar magnet, a second bar magnet, a third bar magnet and a fourth bar magnet which encircle the shaft, the coil, the first iron core lamination and the second iron core lamination.

Preferably, each bar magnet comprises a first region at the top of the magnet, a second region at the middle of the magnet and a third region at the bottom of the magnet,

wherein the first region and the third region are magnetized regions, the magnetization direction is radial, the polarities of the same side of the first region and the third region are opposite, the second region is nonmagnetic,

wherein the first region of each bar magnet has a magnetic property opposite to that of the first region of the adjacent bar magnet facing the first lamination, and the third region of each bar magnet has a magnetic property opposite to that of the third region of the adjacent bar magnet facing the second lamination.

Preferably, the method further comprises:

a magnet holder for fixing the bar magnet;

a housing accommodating the rotor and the stator;

the bottom cover is arranged at the bottom end of the shell;

bearings at both ends of the first and second core laminations; and

and gaskets are positioned between the first iron core lamination and the second iron core lamination and the bearing.

Preferably, the bottom cover is made of an insulating material, and is provided with two wire guide channels to respectively lead out both ends of the coil wire.

Preferably, the brushless ac oscillating micro-motor further comprises a counterweight assembly.

Preferably, the weight assembly includes: a counterweight copper sleeve; an upper cover for accommodating the counterweight copper sleeve; a fixing plate;

wherein, the upper cover is fixed in through upper cover mounting fixed plate, and wherein, the fixed plate is fixed in the magnet support through the fixed plate mounting.

Preferably, the brushless alternating current oscillating micro motor further comprises a power supply module connected with the coil and used for supplying alternating current with controllable frequency to the coil, so that the motor amplitude can be controlled according to the supplied alternating current frequency.

The beneficial effects of the invention are as follows:

the invention provides optimized amplitude-frequency characteristics of the motor, and the amplitude can be controlled according to the driving frequency, so as to achieve better application effect; the counterweight is added, so that the amplitude attenuation is small under the condition of damping; the iron core lamination, the arrangement magnet and the bottom cover threading coil lead are used for achieving an insulating effect, so that the assembly process is improved, and the manufacturing cost is reduced; and the brushless motor structure is applied, so that the service life is prolonged.

Drawings

The features and advantages of the present invention will become apparent from the following description of the invention taken in conjunction with the accompanying drawings, which are not intended to limit the scope of the invention, but rather to demonstrate certain of its attributes, wherein:

FIG. 1 is a schematic diagram of the overall structure of a brushless AC oscillating micro-motor without counterweight according to one embodiment of the invention;

fig. 2 is a schematic view of an internal structure of a brushless ac oscillating micro-motor without counterweight according to an embodiment of the invention;

FIG. 3 is a schematic cross-sectional view of a bottom cover of a brushless AC oscillating micro-motor according to an embodiment of the invention;

FIG. 4 is a schematic diagram of the overall structure of a brushless AC oscillating micro-motor with weights according to an embodiment of the invention;

FIG. 5 is a schematic diagram of a two-stage structure of a brushless AC oscillating micro-motor with weights according to an embodiment of the invention;

fig. 6 is a schematic diagram of an internal structure of a brushless ac oscillating micro-motor with counterweight according to an embodiment of the invention:

FIG. 7A is a schematic diagram of a bar magnet arrangement of a brushless AC oscillating micro-motor according to an embodiment of the invention;

FIG. 7B is a cross-sectional view of the magnet taken along line A-A of FIG. 7A;

FIG. 7C is a cross-sectional view of the magnet taken along line B-B of FIG. 7A;

FIG. 8A is a schematic diagram of the unpowered operating mode of a brushless AC oscillating micro-motor in accordance with an embodiment of the invention;

FIG. 8B is a schematic diagram of the forward energization of a brushless AC oscillating micro-motor in accordance with an embodiment of the invention;

FIG. 8C is a cross-sectional view taken along line C-C of FIG. 8B;

FIG. 8D is a cross-sectional view taken along line D-D of FIG. 8B;

FIG. 8E is a negative-going energized operational schematic diagram of a brushless AC oscillating micro-motor in accordance with an embodiment of the invention;

FIG. 8F is a cross-sectional view taken along line C-C of FIG. 8E;

FIG. 8G is a cross-sectional view taken along line D-D of FIG. 8E;

in the figure:

1. shaft

2. Bearing

3. Gasket

41. First iron core lamination

42. Second core lamination

5. Coil

61. First bar magnet

62. Second bar magnet

63. Third bar magnet

64. Fourth bar magnet

7. Magnet support

8. Shell cover

9. Bottom cover

10. Counterweight copper sleeve

11. Upper cover

12. Upper cover fixing piece

13. Fixing plate

14. Fixing plate fixing piece

15. The guide wire guides the channel.

Detailed Description

The conception, specific structure, and technical effects produced by the present invention will be clearly and completely described below with reference to the embodiments and the drawings to fully understand the objects, aspects, and effects of the present invention. It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The same reference numbers will be used throughout the drawings to refer to the same or like parts.

It should be noted that, unless otherwise specified, when a feature is referred to as being "fixed" or "connected" to another feature, it may be directly or indirectly fixed or connected to the other feature. Further, the descriptions of the upper, lower, left, right, etc. used in the present invention are merely with respect to the mutual positional relationship of the constituent elements of the present invention in the drawings.

Referring to fig. 1 and 2, there are shown overall and internal structural schematic views of a brushless ac oscillating micro-motor without counterweight according to an embodiment of the invention. According to this embodiment, the brushless ac oscillating micro-motor of the present invention includes:

a rotor including a shaft 1, a first core lamination 41 and a second core lamination 42 passing through the shaft 1;

a stator including a coil 5 passing through the shaft 1 and located in the middle of the first and

second lamination sheets

41 and 42, and first, second, third and

fourth bar magnets

61, 62, 63 and 64 surrounding the shaft 1, the coil 5 and the first and

second lamination sheets

41 and 42.

Further comprises:

a magnet holder 7 for fixing the

bar magnets

61, 62, 63, 64;

a housing 8 accommodating the rotor and the stator; and

a bottom cover 9 mounted at the bottom end of the shell 8, bearings 2 at both ends of the first and second iron core laminations 41 and 42, and spacers 3 between the first and second iron core laminations 41 and 42 and the bearings 2.

Referring to fig. 3, a schematic cross-sectional view of a bottom cover of a brushless ac oscillating micro-motor without counterweight according to an embodiment of the invention is shown. According to a preferred embodiment of the present invention, the bottom cover 9 is made of an insulating material, and is provided with two wire guide channels 15 to respectively lead out both ends of the wire of the coil 5. It will be appreciated that the invention is not limited to motor bottom covers and that other suitable positions of the motor housing retaining wire guides may be selected according to different arrangements of parts.

Referring to fig. 4, 5 and 6, there are shown schematic views of the overall structure, secondary structure and internal structure of a brushless ac oscillating micro-motor with counterweight according to an embodiment of the invention. According to a preferred embodiment of the present invention, the brushless ac oscillating micro-motor of the present invention further comprises a weight assembly comprising: a counterweight copper sleeve 10; an upper cover 11 for accommodating the weight copper bush 10; a fixing plate 13; wherein the upper cover 11 is fixed to the fixing plate 13 by an upper cover fixing member 12, and wherein the fixing plate 13 is fixed to the magnet holder 7 by a fixing plate fixing member 14. It will be appreciated that the invention is not so limited and that the invention may be used with different weight materials and configurations depending on the needs.

Referring to fig. 7A, 7B and 7C, a schematic diagram of a bar magnet arrangement and a magnetizing cross-section of a brushless ac oscillating micro-motor according to an embodiment of the present invention are shown. According to a preferred embodiment of the present invention, each

bar magnet

61, 62, 63, 64 comprises a first area at the top of the magnet, a second area at the middle of the magnet, and a third area at the bottom of the magnet, wherein the first area and the third area are magnetized areas, the magnetization direction is radial, the polarities of the same side of the first area and the third area are opposite, the second area is nonmagnetic,

wherein the magnetic properties of the first region of each

bar magnet

61, 62, 63, 64 facing the first lamination 41 are opposite to the magnetic properties of the first region of the

adjacent bar magnet

61, 62, 63, 64 facing the first lamination 41, and the magnetic properties of the third region of each

bar magnet

61, 62, 63, 64 facing the second lamination 42 are opposite to the magnetic properties of the third region of the

adjacent bar magnet

61, 62, 63, 64 facing the second lamination 42.

According to a preferred embodiment of the present invention, the brushless ac oscillating micro-motor further comprises a power supply module (not shown) electrically connected to the coil 5 for supplying a frequency-controllable ac power to the coil 5, so that the motor amplitude can be controlled according to the supplied ac power frequency.

Referring to fig. 8A, a schematic diagram of the unpowered operating mode of a brushless ac oscillating micro-motor is shown in accordance with an embodiment of the present invention. When the power is not applied, the motor shaft is fixed at the intermediate position together with the first core lamination 41, the second core lamination 42 and the shaft 1 by the cogging force.

Referring to fig. 8B, a forward energization operating schematic of a brushless ac oscillating micro-motor is shown in accordance with an embodiment of the invention. When the positive power is applied, magnetic force lines flow to the second iron core lamination 42 through the shaft 1 (iron core action) in the coil 5, then pass through the third areas of the

bar magnets

62 and 63, pass through the shell 8, reach the first areas of the

bar magnets

62 and 63, then pass through the first iron core lamination 41, return to the shaft 1, and complete a closed loop; referring to FIG. 8C, a cross-sectional view along line C-C in FIG. 8B is shown. The sections C-C are repulsed by the same poles and attracted by the opposite poles, and the shaft 1 rotates clockwise by the pushing of the second iron core lamination 42; referring to fig. 8D, a cross-sectional view along line D-D in fig. 8B is shown. The D-D sections repel each other with opposite attraction, and the shaft 1 rotates clockwise due to the pushing of the first core plate 41; thus, upon application of forward power, the shaft 1 will rotate in a clockwise direction.

Referring to fig. 8E, a negative-going energized operating schematic of a brushless ac oscillating micro-motor is shown, according to an embodiment of the invention. When the negative power is applied, magnetic force lines flow to the first iron core lamination 41 through the shaft 1 (iron core action) in the coil 5, then pass through the first areas of the

bar magnets

61 and 64, pass through the shell 8, pass through the second areas of the

bar magnets

61 and 64, then pass through the second iron core lamination 42, and return to the shaft 1 to complete a closed loop; referring to FIG. 8F, a cross-sectional view along line C-C in FIG. 8E is shown. The sections C-C are repulsed by the same poles and attracted by the opposite poles, and the shaft 1 can rotate anticlockwise by the pushing of the second iron core lamination 42; referring to fig. 8G, a cross-sectional view along line D-D in fig. 8E is shown. The D-D sections are repulsed by the homopolar repulsion and the heteropolar attraction, and the shaft 1 can rotate anticlockwise by the pushing of the first iron core lamination 41; thus, upon negative power-on, the shaft 1 will rotate in a counter-clockwise direction.

In summary, when the motor is energized with ac power, the

core plates

41 and 42 swing back and forth on both sides of the intermediate line according to the change of the current direction, so that the driving shaft 1 is driven to rotate back and forth around the shaft center at a certain angle.

The present invention is not limited to the above embodiments, but is merely preferred embodiments of the present invention, and the present invention should be construed as being limited to the above embodiments as long as the technical effects of the present invention are achieved by the same means. Various modifications and variations are possible in the technical solution and/or in the embodiments within the scope of the invention.

Claims

1. A brushless ac oscillating micro-motor, comprising:

a rotor comprising a shaft (1), a first core sheet (41) and a second core sheet (42) passing through the shaft (1);

a stator comprising a coil (5) passing through a shaft (1) and located in between the first and second laminations (41, 42), and a first bar magnet (61), a second bar magnet (62), a third bar magnet (63) and a fourth bar magnet (64) surrounding the shaft (1), the coil (5) and the first and second laminations (41, 42)

Wherein each bar magnet (61, 62, 63, 64) comprises a first region at the top of the magnet, a second region in the middle of the magnet and a third region at the bottom of the magnet,

wherein the magnetic properties of the first region of each bar magnet (61, 62, 63, 64) facing the first core sheet (41) are opposite to the magnetic properties of the first region of the adjacent bar magnet (61, 62, 63, 64) facing the first core sheet (41), and the magnetic properties of the third region of each bar magnet (61, 62, 63, 64) facing the second lamination (42) are opposite to the magnetic properties of the third region of the adjacent bar magnet (61, 62, 63, 64) facing the second lamination (42).

2. The brushless ac oscillating micro-machine of claim 1, further comprising:

a magnet holder (7) for fixing the bar magnets (61, 62, 63, 64);

a housing (8) accommodating the rotor and the stator;

the bottom cover (9) is arranged at the bottom end of the shell sleeve (8);

bearings (2) located at both ends of the first core lamination (41) and the second core lamination (42); and

and gaskets (3) located between the first core lamination (41) and the second core lamination (42) and the bearing (2).

3. Brushless ac oscillating micro-machine according to claim 2, characterized in that the bottom cover (9) is made of insulating material and is provided with two wire guiding channels (15) to lead out the two ends of the wire of the coil (5) respectively.

4. The brushless ac oscillating micro-machine of claim 2, further comprising a counterweight assembly.

5. The brushless ac oscillating micro-machine of claim 4, wherein said counterweight assembly comprises:

a counterweight copper sleeve (10);

an upper cover (11) for accommodating the counterweight copper sleeve (10); and

a fixed plate (13);

wherein the upper cover (11) is fixed to the fixing plate (13) by an upper cover fixing member (12), and wherein the fixing plate (13) is fixed to the magnet holder (7) by a fixing plate fixing member (14).

6. A brushless ac oscillating micro-machine according to claim 1 or 2, characterized in that it further comprises a power supply module connected to the coil (5) for supplying a frequency-controllable ac power to the coil (5) so that the motor amplitude can be controlled in accordance with the supplied ac power frequency.