WO2021254432A1

WO2021254432A1 - Bidirectional magnetic suspension brushed electric motor device

Info

Publication number: WO2021254432A1
Application number: PCT/CN2021/100593
Authority: WO
Inventors: 罗东胜; 晏木
Original assignee: 克瑞科技(东莞)有限公司
Priority date: 2020-06-19
Filing date: 2021-06-17
Publication date: 2021-12-23
Also published as: CN111585415A

Abstract

Disclosed is a bidirectional magnetic suspension brushed electric motor device, comprising an electric motor shell, an electric motor shaft branch and an end cover, wherein the end cover is arranged at the bottom end of the electric motor shell; both the electric motor shell and the end cover are provided with a shaft hole on the axis thereof; the electric motor shaft branch is arranged between the two shaft holes; bearings are provided at the positions at which the electric motor shaft branch is connected to the electric motor shell and to the end cover; the end of the electric motor shaft branch away from the end cover extends out of the electric motor shell; and the top end of the motor shaft branch is provided with a transmission connection shaft. According to the present invention, the transmission of motion is achieved under the electromagnetic effect, without mounting an elastic structure such as a torsion bar, which avoids the situation of a short service life of the electric motor for the reason that the elastic structure is prone to being damaged during use, and also allows the unit volume of the electric motor to transfer torque with a greater value. In addition, the combination of a commutator and an electric brush pin is used to provide a propagation medium, which introduces an external circuit current into a rotor coil winding so as to generate a magnetic field, thus achieving a high working stability.

Description

Two-way magnetic levitation brush motor device

Technical field

The invention relates to the technical field of motors, in particular to a two-way magnetic levitation brushed motor device.

Background technique

With the continuous improvement of people's living standards, electric toothbrushes have begun to enter people's daily lives, replacing traditional toothbrushes to achieve a more ideal and convenient brushing effect.

The existing electric toothbrushes are usually driven by a motor, and the teeth are cleaned by the vibration of the brush head of the toothbrush. The motor in the existing electric toothbrush generally needs to be installed with a spring or a torsion bar similar to a torsion spring. Such a structure is easily damaged during use and is not easy to repair. Therefore, the service life of the motor often depends on how long the structure can be used. Moreover, the above-mentioned structural design makes the load-carrying capacity of the motor low, the torque that a unit volume of the motor can transmit is small, and the swing amplitude of the motor shaft changes greatly when subjected to different loads, and the use effect is not stable enough.

In addition, the existing electric toothbrushes generally swing from left to right in the radial direction and have no axial telescopic function. However, in daily life, people not only need to swing up and down to clean their teeth (radial swing), but also need to move left and right (axial expansion and contraction). ) To achieve the purpose of all-round cleaning, and the safety protection of the electric toothbrush motor needs to be further strengthened.

Therefore, it is necessary to invent a two-way magnetic levitation brush motor device to solve the above-mentioned problems.

Summary of the invention

The purpose of the present invention is to provide a two-way magnetic levitation brushed motor device, which relies on electromagnetic effect to realize the transmission of motion, no longer need to install elastic structures such as torsion bars, on the one hand, it avoids the easy damage of the elastic structure during use and makes the service life of the motor longer. The short situation, on the other hand, enables the unit volume of the motor to transmit a larger value of torque. The combination of the commutator and the brush needle is used to provide the transmission medium to achieve the purpose of all-round cleaning and safety, so as to solve the technical problems. The above shortcomings.

In order to achieve the above objective, the present invention provides the following technical solutions: a two-way magnetic levitation brushed motor device, comprising a motor housing, a motor shaft branch and an end cover, the end cover is arranged at the bottom end of the motor housing, the motor housing and the end cover A shaft hole is opened at the shaft center of the motor shaft, the motor shaft branch is arranged between the two shaft holes, and the connection between the motor shaft branch and the motor housing and the end cover is provided with a bearing, and the motor shaft branch is away from the end cover One end of the motor shaft extends out of the motor housing, and the top of the motor shaft branch is provided with a transmission connecting shaft, the end cover is provided with an insulating protective shell on the side away from the motor housing, and a commutator is sleeved on the outside of the bottom of the motor shaft branch. Two symmetrically distributed brush needles are arranged on both sides of the bottom of the commutator. The cross-sectional shape of the brush needles is set to be L-shaped, and the top and bottom ends of the brush needles are respectively inserted into the commutator and the end cover, A transmission unit is arranged inside the motor housing, and the transmission unit is composed of a stator assembly and a rotor assembly, and the rotor assembly is arranged inside the stator assembly;

The stator assembly includes a stator frame and a magnetic steel. The stator frame is provided with placing slots on both sides, the magnetic steel is arranged inside the placing groove, and both sides of the inner wall of the stator frame are provided with limit frames;

The rotor assembly includes a rotor core and a coil winding, the rotor core is stacked on the outside of the motor shaft branch, the rotor core is composed of rotor teeth and pole shoes, and the rotor teeth and the pole shoes are integrated. The coil winding is wound on the outer side of the rotor teeth;

The number of the placement slots is set to four, the four placement slots are symmetrically distributed about the bisector of the rotor core, the pitch angles between the four placement slots are not equal, and the four magnets are highly staggered. In addition, the heights of two adjacent magnets are different. The magnet and the rotor core form a self-absorbing surface and a non-self-absorbing surface, and the area of the self-absorbing surface is larger than the area of the non-self-absorbing surface.

Preferably, the motor shaft branch is coaxially arranged with the transmission connecting shaft, the bottom end of the transmission connecting shaft is provided with an insertion groove, the top end of the motor shaft branch is arranged inside the insertion groove, and the motor shaft branch is connected to the transmission connection shaft. Transmission connection.

Preferably, the number of the transmission units is set to one or more, and the preset values mentioned by the plurality of transmission units are set to one or more.

Preferably, the cross-sectional shape of the motor housing is set to be flat or circular, the end cover and the stator frame are both matched with the inner contour of the motor housing, and the end cover and the motor housing are riveted and connected, and the rotor core Match with the inner wall of the stator frame.

Preferably, the winding directions of the coil windings on the rotor teeth are the same, and the two transmission units are electrically connected by coil taps, and the four coil winding tap wires are respectively set as coil one, coil two, and coil three. And coil four, the head of coil one is connected to the tail of coil two, the head of coil three is connected to the tail of coil four, the head of coil two and the head of coil four are connected on one side of the commutator, the commutator There are ears on both sides of the top of the commutator, and the tail of the coil one and the tail of the coil three are connected to the ears of the commutator.

Preferably, the coil windings of the coil windings are respectively arranged as upper and lower windings and left and right windings, the magnetic fields of the upper and lower windings are the same when energized, and the magnetic fields are opposite after the left and right windings are energized.

Preferably, the four magnets in the transmission unit are divided into two groups, the number of magnets in each group is set to two, and the polarities of the two magnets in each group are opposite, and the upper and lower magnetic poles of the two groups of magnets correspond to the same .

Preferably, the brush needle is electrically connected with an external power source, and the brush needle is electrically connected with the coil winding through a commutator.

Preferably, the surface of the rotor core is coated with 3M insulating powder.

Among the above technical solutions, the technical effects and advantages provided by the present invention are:

By relying on the electromagnetic effect to realize the transmission of motion, it is no longer necessary to install elastic structures such as torsion bars. On the one hand, it avoids the easy damage of the elastic structure during use and shortens the service life of the motor. On the other hand, it allows the unit volume of the motor to be transmitted. A larger value of torque uses the combination of a commutator and a brush needle to provide a propagation medium, and introduces external circuit current to the rotor coil winding to generate a magnetic field. The work stability is higher. Compared with the prior art, it can simultaneously axially and Brushing teeth by rotating radially fills the gap that electric toothbrushes on the market have no axial telescopic movement except for radial left and right swings.

Description of the drawings

In order to explain the embodiments of the present application or the technical solutions in the prior art more clearly, the following will briefly introduce the drawings that need to be used in the embodiments. Obviously, the drawings in the following description are only those described in the present invention. For some of the embodiments, for those of ordinary skill in the art, other drawings may be obtained based on these drawings.

Figure 1 is an exploded view of the overall structure of the present invention;

Figure 2 is a schematic diagram of the overall structure of the present invention;

Figure 3 is a right side view of the present invention;

Fig. 4 is a schematic diagram of the A-A' cross-sectional structure in Fig. 3 of the present invention;

Figure 5 is a front view of the present invention;

Fig. 6 is a schematic diagram of the sectional structure of B-B' in Fig. 5 of the present invention;

Figure 7 is a schematic diagram of the structure of the rotor core of the present invention;

Figure 8 is a schematic diagram of the internal structure of the motor of the present invention;

Fig. 9 is a schematic diagram of the cross-sectional structure of C-C' in Fig. 8 of the present invention;

Fig. 10 is a schematic diagram of the cross-sectional structure of D-D' in Fig. 8 of the present invention;

Figure 11 is a front view of the self-priming surface and non-self-priming surface distribution structure of the present invention;

Figure 12 is a left view of the self-priming surface and non-self-priming surface distribution structure of the present invention;

Figure 13 is a left view of the polar distribution structure of the magnetic steel in the present invention;

Figure 14 is a front view of the polar distribution structure of the magnetic steel in the present invention;

Figure 15 is a schematic diagram of the magnetic steel distribution structure of the present invention.

Description of reference signs:

1 motor housing, 2 motor shaft branch, 3 end cover, 4 bearing, 5 transmission connecting shaft, 6 insulation cover, 7 commutator, 8 brush needle, 9 stator assembly, 10 rotor assembly, 11 stator skeleton, 12 magnet Steel, 121 self-priming surface, 122 non-self-priming surface, 13 placement slot, 14 limit frame, 15 rotor core, 151 rotor tooth, 152 pole shoe, 16 coil winding, 161 coil one, 162 coil two, 163 coil three , 164 coil four.

detailed description

In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

The present invention provides a two-way magnetic levitation brushed motor device as shown in Figures 1-15, comprising a motor housing 1, a motor shaft branch 2 and an end cover 3. The end cover 3 is arranged at the bottom end of the motor housing 1. The shaft center of the motor housing 1 and the end cover 3 are both provided with shaft holes, the motor shaft branch 2 is arranged between the two shaft holes, and the connection between the motor shaft branch 2 and the motor housing 1 and the end cover 3 is provided There is a bearing 4, the end of the motor shaft branch 2 away from the end cover 3 extends out of the motor housing 1, and the top of the motor shaft branch 2 is provided with a transmission connecting shaft 5, and the end cover 3 is provided with insulation on the side away from the motor housing 1 A protective shell 6, a commutator 7 is sleeved on the outside of the bottom of the motor shaft branch 2, and two brush needles 8 distributed symmetrically are arranged on both sides of the bottom of the commutator 7. The cross section of the brush needle 8 The shape is set to be an L shape, and the top and bottom ends of the brush needle 8 are respectively inserted into the commutator 7 and the end cover 3. The motor housing 1 is provided with a transmission unit, and the transmission unit consists of a stator assembly 9 and a rotor assembly 10, and the rotor assembly 10 is arranged inside the stator assembly 9;

The stator assembly 9 includes a stator frame 11 and a magnetic steel 12. Both sides of the stator frame 11 are provided with placing slots 13, the magnetic steel 12 is arranged inside the placing groove 13, and both sides of the inner wall of the stator frame 11 are provided. Limited frame 14;

The rotor assembly 10 includes a rotor core 15 and a coil winding 16. The rotor core 15 is laminated on the outside of the motor shaft branch 2. The rotor core 15 is composed of rotor teeth 151 and pole shoes 152, and the rotor teeth 151 is integrated with the pole piece 152, and the coil winding 16 is wound on the outer side of the rotor tooth 151;

The number of the placement slots 13 is set to four, the four placement slots 13 are symmetrically distributed about the bisector of the rotor core 15, the spacing angles between the four placement slots 13 are not equal, the four magnets The heights of 12 are staggered, and two adjacent magnets 12 have different heights. The magnets 12 and the rotor core 15 form a self-absorbing surface 121 and a non-self-absorbing surface 122, and the area of the self-absorbing surface 121 is larger than that of the non-self-absorbing surface. Surface area of 122;

The combination of the commutator 7 and the brush needle 8 provides a medium to introduce external circuit current to the rotor coil winding to generate a magnetic field.

Further, in the above technical solution, the motor shaft branch 2 is coaxially arranged with the transmission connecting shaft 5, the bottom end of the transmission connecting shaft 5 is provided with an insertion slot, and the top end of the motor shaft branch 2 is provided in the insertion slot Inside, and the motor shaft branch 2 and the transmission connecting shaft 5 are connected in transmission, on the one hand, the machining accuracy of the shaft is improved, and the production efficiency is improved on the other hand. Different customers only need to replace different output shafts. The motor can be stocked and it is easy to standardize.

Further, in the above technical solution, the number of the transmission units is set to one or more, and the preset values mentioned by the plurality of transmission units are set to one or more.

Further, in the above technical solution, the cross-sectional shape of the motor housing 1 is set to be flat or circular, the end cover 3 and the stator frame 11 are both matched with the inner contour of the motor housing 1, and the end cover 3 and the motor housing 1 is riveted and connected, the rotor core 15 matches the inner wall of the stator frame 11, and the insulating sheath 6 can protect the brush needle 8 from being easily deformed. After the welding wire is covered, the connecting wire is led out, which also serves as an insulation Purpose.

Further, in the above technical solution, the winding directions of the coil windings 16 on the rotor teeth 151 are the same, and the two transmission units are electrically connected by coil taps, and the four coil windings 16 are provided with tapped wires respectively. Are coil one 161, coil two 162, coil three 163 and coil four 164, the head of the coil one 161 is connected to the tail of the coil two 162, the head of the coil three 163 is connected to the tail of the coil four 164, and the coil two 162 The head of the coil one 161 is connected to the head of the coil four 164 on the side of the commutator 7, and both sides of the top end of the commutator 7 are provided with ears. The tail of the coil one 161 and the tail of the coil three 163 are connected to the commutator 7 on the ears.

Further, in the above technical solution, the coil windings of the coil winding 16 are respectively arranged as upper and lower windings and left and right windings, the magnetic fields of the upper and lower windings are the same after being energized, and the magnetic fields are opposite after the left and right windings are energized.

Further, in the above technical solution, the four magnets 12 in the transmission unit are divided into two groups, the number of magnets 12 in each group is set to two, and the two magnets 12 in each group have opposite polarities. , The upper and lower magnetic poles of the two sets of magnets 12 correspond to the same;

In the radial direction, because the rotor teeth attract magnets, and the self-attracting surface has a larger area than the non-self-attracting surface, it can be suspended in the radial direction; in the axial direction, because the rotor core attracts magnets, and the self-attracting surface is larger than the non-self-attracting surface The suction surface area is large, so the axial direction can be suspended; in the radial direction, even if the rotor deflects to the maximum position angle, the area of the self suction surface is still larger than the non-self suction surface; in the axial direction, even if the rotor axially moves to the maximum position, the self-priming surface The area of the suction surface is still larger than that of the non-self-suction surface.

Further, in the above technical solution, the brush needle 8 is electrically connected to an external power source, and the brush needle 8 is electrically connected to the coil winding 16 through the commutator 7.

Further, in the above technical solution, 3M insulating powder is coated on the surface of the rotor core 15 to provide insulation between the coil winding 16 and the rotor core 15.

The bottom end of the motor housing 1 is riveted and sealed by the end cover 3, and is matched with the insulating protective shell 6 for insulation protection. The bearing 4 is used to form a bidirectional magnetic levitation motor structure relative to the stator assembly 9, so that the rotation of the motor shaft 2 is smoother and avoids the motor shaft 2 The wear and tear of the motor shaft can also stabilize the position of the motor shaft 2. At the same time, a pair of bearings 4 can make the front and rear ends of the motor shaft 2 more evenly stressed, and the installation is stable. On the one hand, it provides a support position for the motor shaft 2 , It is convenient for the compact installation and stable cooperation of the stator assembly 9 and the rotor assembly 10. On the other hand, it can also protect the internal stator assembly 9 and the rotor assembly 10 from the pollution and influence of the external environment as little as possible, and ensure the continuous stability of the motor shaft 2 Power transmission.

The specific implementation is as follows: when the device is actually used, the external current is guided to the coil winding 16 through the commutator 7 and the brush needle 8 to form a magnetic field at the rotor core 15, and the magnetic steel 12 is located within the range of the magnetic field. Both the radial and axial directions have preset values. They interact. The stators of the same polarity push the anisotropic magnets 12, and the magnets 12 of the same polarity are subjected to the force of the anisotropic stator magnetic field, so that the magnets 12 are pushed. The rotor core 15 rotates while causing it to reciprocate up and down. Because the rotor core 15 is fixedly connected to the motor shaft branch 2, it drives the motor shaft branch 2 to rotate while reciprocating up and down. The coil winding 16 switches the direction of current through an external circuit and Control the energization time, so that the rotor produces left and right reciprocating movements. The movement of the rotor assembly 10 corresponds to the movement of the motor shaft 2, which relies on the electromagnetic effect to realize movement transmission. It is no longer necessary to install elastic structures such as torsion bars. On the one hand, elastic structures are avoided. When it is easily damaged during use, the service life of the motor is shorter. On the other hand, the unit volume of the motor can transmit a larger value of torque, and the volume of the motor can be reduced as much as possible when the rated torque is reached. When applied to an electric toothbrush, it can reduce the weight of the electric toothbrush. While swinging from side to side, the up and down movement is closer to the feeling of brushing in daily life. The cleaning effect is greatly improved. The power is transmitted through the electromagnetic structure, making the power transmission process more stable and changing. The combination of the device 7 and the brush needle 8 provides a propagation medium, and introduces the external circuit current into the rotor coil winding to generate a magnetic field, and the working stability is high.

The working principle of the present invention:

Referring to Figures 1-14 of the specification, the coil winding 16 is energized to form a magnetic field at the rotor core 15. The magnetic steel 12 is located in the range of the magnetic field. Since there are preset values in the radial and axial directions, they interact with each other and have the same polarity. The stator pushes the anisotropic magnet 12, and the magnet 12 of the same polarity is subjected to the anisotropic stator magnetic field force, so that the magnet 12 pushes the rotor core 15 to rotate while making it reciprocate up and down. The motor shaft branch 2 is fixedly connected to drive the motor shaft branch 2 to reciprocate up and down while rotating. The coil winding 16 switches the direction of current through an external circuit and controls the energization time, thereby causing the rotor to reciprocate left and right, and the movement of the rotor assembly 10 corresponds to The movement of the motor shaft 2 relies on the electromagnetic effect to realize the movement transmission. It is no longer necessary to install elastic structures such as torsion bars. On the one hand, it avoids the easy damage of the elastic structure during use and shortens the service life of the motor. On the other hand, it makes A motor per unit volume can transmit a larger value of torque.

The above describes some exemplary embodiments of the present invention only by way of illustration. Needless to say, for those of ordinary skill in the art, without departing from the spirit and scope of the present invention, a variety of different ways can be used. The described embodiment is modified. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

A two-way magnetic levitation brushed motor device includes a motor housing (1), a motor shaft branch (2) and an end cover (3), characterized in that the end cover (3) is arranged at the bottom end of the motor housing (1), The shaft centers of the motor housing (1) and the end cover (3) are both provided with shaft holes, the motor shaft branch (2) is arranged between the two shaft holes, and the motor shaft branch (2) is connected to the motor housing (1) and the end cover (3) are equipped with a bearing (4), the motor shaft branch (2) extends out of the motor housing (1) at one end away from the end cover (3), and the motor shaft branch (2) ) Is provided with a transmission connecting shaft (5) at the top, an insulating protective shell (6) is provided on the side of the end cover (3) away from the motor housing (1), and the outer side of the motor shaft branch (2) is sleeved with a replacement The commutator (7) is provided with two symmetrically distributed brush needles (8) on both sides of the bottom of the commutator (7), and the cross-sectional shape of the brush needles (8) is set to be L-shaped, and the The top and bottom ends of the brush needle (8) are respectively plugged into the commutator (7) and the end cover (3). The motor housing (1) is provided with a transmission unit, and the transmission unit consists of a stator assembly (9) and The rotor assembly (10) is composed, and the rotor assembly (10) is arranged inside the stator assembly (9);

The stator assembly (9) includes a stator frame (11) and a magnet (12). Both sides of the stator frame (11) are provided with placement slots (13), and the magnet (12) is set in the placement slot ( 13) Inside, limit frames (14) are provided on both sides of the inner wall of the stator frame (11);

The rotor assembly (10) includes a rotor core (15) and a coil winding (16), the rotor core (15) is laminated on the outside of the motor shaft branch (2), and the rotor core (15) is composed of The rotor teeth (151) and the pole shoes (152) are composed, and the rotor teeth (151) and the pole shoes (152) are integrally arranged, and the coil winding (16) is wound on the outer side of the rotor teeth (151);

The number of the placing grooves (13) is set to four, the four placing grooves (13) are symmetrically distributed about the bisector of the rotor core (15), and the spacing angle between the four placing grooves (13) is not Equal, the four magnets (12) are staggered in height, and two adjacent magnets (12) have different heights. The magnets (12) and the rotor core (15) form a self-absorption surface (121). ) And the non-self-priming surface (122), and the area of the self-priming surface (121) is larger than the area of the non-self-priming surface (122).
The two-way magnetic levitation brush motor device according to claim 1, characterized in that: the motor shaft branch (2) and the transmission connecting shaft (5) are arranged coaxially, and the bottom end of the transmission connecting shaft (5) is opened There is an insertion slot, the top of the motor shaft branch (2) is arranged inside the insertion slot, and the motor shaft branch (2) is drivingly connected with the transmission connecting shaft (5).
The two-way magnetic levitation brushed motor device according to claim 1, wherein the number of the transmission unit is set to one or more, and the preset values mentioned by the plurality of transmission units are set to one or more. Piece.
The bidirectional magnetic levitation brush motor device according to claim 1, characterized in that: the cross-sectional shape of the motor housing (1) is set to be flat or round, and the end cover (3) and the stator frame (11) They are matched with the inner contour of the motor housing (1), and the end cover (3) and the motor housing (1) are riveted and connected, and the rotor core (15) is matched with the inner wall of the stator frame (11).
The two-way magnetic levitation brush motor device according to claim 1, characterized in that: the winding direction of the coil windings (16) on the rotor teeth (151) is the same, and the two transmission units pass through the coil taps. Electrically connected, the four coil windings (16) tap wires are respectively set as coil one (161), coil two (162), coil three (163) and coil four (164), the coil one (161) The head is connected to the tail of coil two (162), the head of coil three (163) is connected to the tail of coil four (164), the head of coil two (162) and the head of coil four (164) are connected to the commutator (7) On one side, there are ears on both sides of the top of the commutator (7), and the tail of the coil one (161) and the tail of the coil three (163) are connected to the ears of the commutator (7). Come on.
The two-way magnetic levitation brush motor device according to claim 1, characterized in that: the coil windings of the coil winding (16) are respectively arranged as upper and lower windings and left and right windings, and the magnetic fields of the upper and lower windings are the same after being energized, so After the left and right windings are energized, the magnetic fields are opposite.
The two-way magnetic levitation brush motor device according to claim 1, characterized in that: the four magnets (12) in the transmission unit are divided into two groups, and the number of magnets (12) in each group is set to two. The two magnets (12) in each group have opposite polarities, and the upper and lower magnetic poles of the two groups of magnets (12) correspond to the same.
The bidirectional magnetic levitation brush motor device according to claim 1, characterized in that: the brush needle (8) is electrically connected to an external power source, and the brush needle (8) passes through a commutator (7) It is electrically connected with the coil winding (16).
The bidirectional magnetic levitation brush motor device according to claim 1, characterized in that: the surface of the rotor core (15) is coated with 3M insulating powder.