A magnetoresistive positioning limited-rotation-angle acoustic vibration motor

Abstract

A magnetoresistive positioning limited-rotation angle acoustic vibration motor of the present invention includes: a housing; a stator assembly disposed within the housing, the stator assembly including a stator core having two symmetrically arranged stator magnetic poles, a bobbin, and stator coils, the two bobbins and the two stator coils being disposed on the stator core, the two stator coils being connected in series and having opposite winding directions; a rotor assembly including a rotating shaft, a rotor core, and two magnets embedded within the rotor core. In the magnetoresistive positioning limited-rotation angle acoustic vibration motor of the present invention, the distribution of four magnetic poles of the rotor is achieved through the tooth-slot design of the rotor core, enabling the rotor assembly to be well positioned and returned through magnetoresistive fixation within the housing, reducing the loss of output torque and improving the torque output efficiency; at the same time, the motor makes full use of the magnetic energy product to enhance the output torque of the motor, and the swing amplitude is also more stable.

Description

Technical Field

[0001] The present invention relates to the technical field of daily necessities, and more specifically, to a magnetoresistive positioning limited-angle acoustic vibration motor. Background Art

[0002] 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.

[0003] Electric toothbrushes usually use a motor to drive, so that the vibration of the toothbrush head plays a role in cleaning teeth. Generally, the motors in existing electric toothbrushes need to install springs or torsion bars similar to torsion springs. Such structures are prone to damage and difficult to repair during use. Moreover, with the above structural design, the load-bearing capacity of the motor is low, the torque that can be transmitted by the motor per unit volume is small, and the swing amplitude of the motor shaft changes greatly when bearing different loads. The output torque of the motor is small, and the output torque efficiency is low, and the use effect is not stable enough. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a magnetoresistive positioning limited-angle acoustic vibration motor. The magnetoresistive positioning limited-angle acoustic vibration motor of the present invention realizes the dispersion of the four magnetic poles of the rotor assembly, enabling the rotor assembly to be well positioned and returned through magnetoresistive fixation in the motor, reducing the loss of output torque and improving the torque output efficiency; at the same time, the motor makes full use of the magnetic product energy to enhance the output torque of the motor, and the swing amplitude is also more stable.

[0005] In order to achieve the above purpose, the present invention provides the following technical solutions:

[0006] A magnetoresistive positioning limited-angle acoustic vibration motor, comprising:

[0007] A housing;

[0008] A stator assembly, the stator assembly is arranged in the housing, the stator assembly includes a stator chip with two symmetrically arranged stator magnetic poles, a wire holder and a stator coil. Two wire holders and two stator coils are arranged on the stator chip, and the two stator coils are connected in series and have opposite winding directions;

[0009] A rotor assembly, the rotor assembly includes a rotating shaft, a rotor chip and two magnets embedded in the rotor chip. The rotating shaft is arranged in the central hole of the rotor chip. The rotor assembly is arranged in the middle of the inner circle of the stator assembly, and one end of the rotating shaft is arranged outside the housing.

[0010] Preferably, the rotor chip is provided with symmetric rotor chip grooves, and the two magnets are symmetrically embedded in the two rotor chip grooves.

[0011] Preferably, the housing includes an end cap and a casing. The end cap is fixedly connected to the casing by riveting. The stator assembly and the rotor assembly are both disposed within the housing. The upper end of the rotating shaft is connected to the end cap through a ball bearing of the end cap.

[0012] Preferably, the lower end of the rotating shaft is connected to the casing through a ball bearing of the casing.

[0013] Preferably, additional slots are provided at the centers of the two stator magnetic poles.

[0014] Preferably, the rotor chip is provided with 4 rotor chip teeth and 2 rotor chip slots.

[0015] Preferably, the stator chip is made by stacking and riveting silicon steel sheets.

[0016] Preferably, the rotor chip is made by stacking and riveting silicon steel sheets.

[0017] Preferably, the magnets are all neodymium iron boron strong magnets.

[0018] According to the above technical solution, it can be known that in the magnetoresistive positioning limited-angle acoustic vibration motor of the present invention, it includes: a housing; a stator assembly, the stator assembly is arranged in the housing, the stator assembly includes a stator core with two symmetrically arranged stator magnetic poles, a bobbin, and a stator coil. Two bobbins and two stator coils are arranged on the stator core. The two stator coils are connected in series and have opposite winding directions; a rotor assembly, the rotor assembly includes a rotating shaft, a rotor core, and two magnets embedded in the rotor core. The rotating shaft is arranged in the central hole of the rotor core. The rotor assembly is arranged in the middle of the inner circle of the stator assembly, and one end of the rotating shaft is arranged outside the housing. The working surfaces of the magnets in each rotor core are distributed with N and S poles, so that the rotor assembly forms four scattered magnetic poles, and the cooperation with the stator magnetic poles realizes the balance of the magnetic field acting force in the static state, so that the rotor assembly is fixed in the housing through magnetoresistance. At the same time, the magnetic pole center lines of the rotor core and the stator core are kept on the same center, thus realizing the positioning of the rotor assembly and canceling the previous positioning and homing of the rotor through an elastic shaft or a torsion spring and through four magnets. In addition, when the stator coil is energized, since the winding directions of the two stator coils are opposite, the electromagnetic fields generated are one N pole and the other S pole. At the same time, the working surfaces of each magnet are distributed with N and S poles, and the magnetic pole installation directions of the two magnets are the same, so that the magnetic poles of the four chip teeth of the rotor core attract each other with different poles and repel each other with the same poles as the stator magnetic poles, so that the rotor core generates torsion and drives the rotor assembly to rotate. Since the positive and negative square wave currents are connected, the change of the current direction will bring about the change of the magnetic poles of the stator core, so the direction of the torsion will also change. At this time, the rotor assembly will perform a reciprocating small-amplitude rotation. This kind of motion transmission realized by the electromagnetic effect makes the reciprocating motion of the rotor assembly smoother and more stable. Since the technical solution of positioning and homing with an elastic shaft or a torsion spring and other elastic structures is canceled, it avoids the situation that the elastic structure is easily damaged during use, resulting in a short service life of the motor, and also avoids consuming the output torque of the motor on the elastic structure, so that the motor of unit volume can transmit a larger value of torque, reduce the output torque loss, improve the use efficiency of the output torque, and at the same time improve the life of the motor; also because the technical solution of positioning and homing through four magnets is canceled, the magnetic fields generated by the stator assembly and the rotor assembly are more concentratedly distributed on the working surface, making full use of the magnetic product energy, improving the output torque of the motor, and the swing amplitude will not change greatly due to the change of the load, and the weight of the motor can also be reduced to a certain extent. Description of the Drawings

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0020] Figure 1 It is a schematic structural diagram of the magnetoresistive positioning limited-rotation-angle acoustic wave vibration motor of the present invention;

[0021] Figure 2 It is an exploded view of the magnetoresistive positioning limited-rotation-angle acoustic wave vibration motor of the present invention;

[0022] Figure 3 It is a schematic diagram of the rotor assembly of the magnetoresistive positioning limited-rotation-angle acoustic wave vibration motor of the present invention;

[0023] Figure 4 It is a schematic diagram of the stator assembly of the magnetoresistive positioning limited-rotation-angle acoustic wave vibration motor of the present invention;

[0024] Figure 5 It is a schematic diagram of the operation of the magnetoresistive positioning limited-rotation-angle acoustic wave vibration motor according to an embodiment of the present invention;

[0025] Figure 6 It is a schematic structural diagram of the rotor chip of the magnetoresistive positioning limited-rotation-angle acoustic wave vibration motor according to an embodiment of the present invention;

[0026] Figure 7 It is a structural cross-sectional view of the magnetoresistive positioning limited-rotation-angle acoustic wave vibration motor according to an embodiment of the present invention;

[0027] Among them, the markings in the drawings are as follows:

[0028] 1 - rotating shaft, 2 - end cover, 3 - housing, 4 - rotor chip, 5 - magnet, 6 - stator chip, 7 - wire frame, 8 - stator coil, 9 - end cover ball bearing, 10 - housing ball bearing, 11 - rotor chip groove, 12 - additional groove, 13 - rotor chip tooth. Detailed implementation manners

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0030] Please refer to Figure 1-7 , Figure 1Schematic structural diagram of the magnetoresistive positioning limited-rotation-angle acoustic vibration motor of the present invention; Figure 2 Explosion diagram of the magnetoresistive positioning limited-rotation-angle acoustic vibration motor of the present invention; Figure 3 Schematic diagram of the rotor assembly of the magnetoresistive positioning limited-rotation-angle acoustic vibration motor of the present invention; Figure 4 Schematic diagram of the stator assembly of the magnetoresistive positioning limited-rotation-angle acoustic vibration motor of the present invention; Figure 5 Schematic diagram of the operation of the magnetoresistive positioning limited-rotation-angle acoustic vibration motor according to an embodiment of the present invention; Figure 6 Schematic structural diagram of the rotor chip of the magnetoresistive positioning limited-rotation-angle acoustic vibration motor according to an embodiment of the present invention; Figure 7 Structural sectional view of the magnetoresistive positioning limited-rotation-angle acoustic vibration motor according to an embodiment of the present invention.

[0031] In a specific embodiment of the present invention, as Figure 1 and 2 shown, a magnetoresistive positioning limited-rotation-angle acoustic vibration motor includes: a housing; a stator assembly, the stator assembly is disposed within the housing, the stator assembly includes a stator chip 6 with two symmetrically arranged stator magnetic poles, a bobbin 7, and a stator coil 8, the two bobbins 7 and the two stator coils 8 are both disposed on the stator chip 6, the two stator coils 8 are connected in series and have opposite winding directions; when energized, the stator chip 6 can generate electromagnetic poles of different polarities, and at the same time this winding method also reduces the winding space and copper loss of the coil; a rotor assembly, the rotor assembly includes a rotating shaft 1, a rotor chip 4, and two magnets 5 embedded within the rotor chip 4, the rotating shaft 1 is disposed within the central hole of the rotor chip 4, the rotor assembly is disposed in the middle of the inner circle of the stator assembly, one end of the rotating shaft 1 is disposed outside the housing, the working surfaces of each magnet 5 are distributed with N and S poles, so that the four rotor chip teeth 13 form four scattered magnetic poles, which cooperate with the stator magnetic poles to achieve a balanced state of the magnetic field acting force in the static state, thereby enabling the rotor assembly to be fixed within the housing through magnetoresistance, and at the same time the magnetic pole center lines of the rotor chip 4 and the stator chip 6 are kept on the same center, thereby realizing the positioning of the rotor assembly, canceling the previous positioning and homing of the rotor assembly through an elastic shaft or a torsion spring and through the four magnets 5. In addition, the inlets and outlets of the two stator coils 8 are fixed and then pass through the end cover 2 and then are led out to connect to an external power source. When the stator coils 8 are energized, as Figure 5The figure shows the working state of the motor rotating reciprocally in two directions during operation. Since the winding directions of the two stator coils 8 are opposite, the electromagnetic fields generated are one N pole and the other S pole. At the same time, the working surfaces of each magnet 5 are distributed with N and S poles, and the magnetic pole installation directions of the two magnets 5 are the same, causing the magnetic poles of the four rotor chip teeth 13 of the rotor chip 4 to attract with opposite poles and repel with like poles to the stator magnetic poles, so that the rotor chip 4 generates torque and drives the rotation of the rotor assembly. Since the positive and negative square-wave currents are connected, the change in the current direction will bring about a change in the magnetic pole polarity of the stator chip 6, and thus the direction of the torque will also change. For example, when the current direction changes, it will cause the magnetic pole polarity of the stator chip 6 to change, the original magnetic pole N becomes the S pole, and the original magnetic pole S becomes the N pole, causing the rotating shaft 1 to rotate in the opposite direction, thus realizing the motion transmission, and the rotating shaft 1 realizes a small reciprocating rotation. This motion transmission achieved by the electromagnetic effect makes the rotation process smoother and more stable. Since the technical solution of positioning and homing with an elastic shaft or a torsion spring and other elastic structures is cancelled, and the motion transmission is realized by relying on the electromagnetic effect, it avoids the situation that the elastic structure is easily damaged during use, resulting in a short service life of the motor, and also avoids consuming the output torque of the motor on the elastic structure, enabling the motor per unit volume to transmit a larger value of torque, reducing the output torque loss, improving the use efficiency of the output torque, and at the same time enhancing the life of the motor. Also, since the technical solution of positioning and homing through four magnets 5 is cancelled, the magnetic fields generated by the stator assembly and the rotor assembly are more concentratedly distributed on the working surface, making full use of the magnetic product energy, enhancing the output torque of the motor, and the swing amplitude will not change greatly due to the change of the load, and the weight of the motor can also be reduced to a certain extent.

[0032] In another specific embodiment of the present invention, as Figure 4 and 7 shown, the stator chip 6 is provided with two magnetic poles, and the two stator wire frames 7 and the two stator coils 8 are arranged on the stator chip 6. The stator assembly is arranged in the housing, on the one hand, providing a supporting position for the internal structure, facilitating the compact installation and stable cooperation of the internal structure, and on the other hand, also being able to protect the internal structure from being polluted and affected by the external environment as little as possible, ensuring the continuous and stable power transmission inside.

[0033] In another specific embodiment of the present invention, as Figure 3 and 6As shown, the rotor chip 4 is provided with two symmetric rotor chip slots 11 and four rotor chip teeth 13. Two of the magnets 5 are symmetrically embedded in the two rotor chip slots 11. The structural design of the rotor chip slots 11 and the rotor chip teeth 13 enables the four scattered permanent magnetic poles with different polarities generated by the two magnets 5 to better maintain magnetism and magnetic quantity, reduce magnetic leakage, provide the required positioning torque and homing torque for the rotor assembly, and ensure that the magnetic pole center lines of the rotor chip 4 and the stator chip 6 are kept on the same center, so that the positioning and homing of the rotor assembly are more accurate. It should be noted here that the technical effect achieved by the symmetric and equal design of the two rotor chip slots 11 and the four rotor chip teeth 13 is the best. Similarly, the best design for the rotor 4 itself is also a symmetric and equal design. However, it should be noted that other structural designs are also acceptable as long as the same technical effect can be achieved.

[0034] In another specific embodiment of the present invention, as Figure 2 shown, the housing includes an end cover 2 and a casing 3. The end cover 2 is fixedly connected to the casing 3 by riveting. The stator assembly and the rotor assembly are both arranged in the casing 3. The upper end of the rotating shaft 1 is connected to the end cover 2 through an end cover ball bearing 9, and the lower end of the rotating shaft 1 is connected to the casing 3 through a casing ball bearing 10, making the rotation of the rotating shaft 1 smoother, avoiding the wear of the rotating shaft 1, and at the same time stabilizing the position of the rotating shaft 1. The design of a pair of ball bearings can make the forces on the front and rear ends of the rotating shaft 1 evenly distributed and the installation stable.

[0035] In another specific embodiment of the present invention, as Figure 7 shown, additional slots 12 are provided at the centers of the magnetic poles of the two stator chips 6. The additional slots 12 cooperate with the design of the rotor chip slots 11 and the rotor chip teeth 13, enabling the concentrated penetration of magnetic force lines between the working surfaces of the stator assembly and the rotor assembly, and providing the required positioning force and homing force for the rotor assembly.

[0036] In another specific embodiment of the present invention, the stator chip 6 and the rotor chip 4 are made by stacking and riveting silicon steel sheets, and the magnets 5 are all neodymium iron boron permanent magnets. Neodymium iron boron magnets have good mechanical properties, and are small in size, light in weight, and strong in magnetism. They can enhance the balance of the rotor assembly in the magnetic levitation state, make the motor more stable in balance, no longer require extra fixing parts, and can enable the motor to achieve accurate homing after stopping rotating.

[0037] In another specific embodiment of the present invention, as Figure 2As shown, the fitting method between the rotating shaft 1, the rotor chip 4, the ball bearing 9, and the rolling bearing 10 is preferably an interference fit; the fitting method between the rotor chip 4 and the magnet 5 is preferably a transition fit. However, other fitting methods or adhesives can also be selected as long as stable technical effects can be achieved.

[0038] In summary, for the reluctance positioning limited-angle acoustic vibration motor of the present invention, the four poles of the rotor are dispersed through the design of the rotor chip tooth grooves, enabling the rotor assembly to be well positioned and returned through reluctance fixation within the housing, reducing the loss of output torque and improving the torque output efficiency; at the same time, the motor makes full use of the magnetic energy product to enhance the output torque of the motor, and the swing amplitude is also more stable.

[0039] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A magnetoresistive positioning limited-rotation angle acoustic vibration motor, characterized in that Comprising: A housing; A stator assembly, which is arranged inside the housing. The stator assembly includes a stator core with two symmetrically arranged stator magnetic poles, a bobbin, and stator coils. Two bobbins and two stator coils are arranged on the stator core. The two stator coils are connected in series and have opposite winding directions; A rotor assembly, which includes a rotating shaft, a rotor core, and two magnets embedded in the rotor core. The rotating shaft is arranged in the central hole of the rotor core. The rotor assembly is arranged in the middle of the inner circle of the stator assembly, and one end of the rotating shaft is arranged outside the housing; The rotor core is provided with symmetric rotor core slots. The rotor core is provided with 4 rotor core teeth and 2 rotor core slots. The two magnets are symmetrically embedded in the two rotor core slots, so that the four rotor core teeth form four scattered magnetic poles, and the magnetic field acting force is in a balanced state under the static state in cooperation with the stator magnetic poles; The rotor core teeth protrude from the outer side surface of the magnet, and the rotor core teeth wrap the two side edges of the outer side surface of the magnet.

2. The magnetoresistive positioning limited-rotation angle acoustic vibration motor according to claim 1, wherein The housing includes an end cover and a casing. The end cover is fixedly connected to the casing by riveting. The stator assembly and the rotor assembly are both arranged inside the housing. The upper end of the rotating shaft is connected to the end cover through a ball bearing on the end cover.

3. The magnetoresistive positioning limited-rotation angle acoustic vibration motor according to claim 2, characterized in that The lower end of the rotating shaft is connected to the casing through a ball bearing on the casing.

4. The magnetoresistive positioning limited-rotation angle acoustic vibration motor according to claim 1, wherein Additional slots are arranged at the centers of the two stator magnetic poles.

5. The magnetoresistive positioning limited-angle acoustic vibration motor according to claim 1, wherein, The stator core is made by stacking and riveting silicon steel sheets.

6. The magnetoresistive positioning limited-rotation angle acoustic vibration motor according to claim 1, wherein The rotor core is made by stacking and riveting silicon steel sheets.

7. The magnetoresistive positioning limited-angle acoustic vibration motor according to claim 1, wherein, The magnets are all neodymium iron boron strong magnets.

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