Plane vibration motor for handheld device and handheld device comprising same

Abstract

The development of the planar vibration motor marks the great progress of handheld equipment. This innovative motor achieves planar motion, an armature having a body and a firmly attached shaft, a stator consisting of two parts, equipped with a stator support providing a space for resistance-free motion of the armature, and an elastic support connecting the armature and the stator, promoting frictionless vibration on a defined plane. The motor can be seamlessly integrated into various handheld devices, including toothbrushes and shavers, so that the functions and performance of the handheld devices are enhanced.

Description

Technical Field

[0001] The present invention relates to electric motors for handheld devices. Background of the Invention

[0003] Handheld devices such as electric toothbrushes, electric shavers, and various reciprocating cutting tools typically contain an electric motor that drives the tool. These devices are more effective when driven by planar vibration motors than by other types of motion motors (such as rotary or cyclic motion motors) when operating on specific human surfaces such as teeth or skin. Although devices equipped with planar vibration motors have certain use value, they often have difficulties in arranging, operating and controlling forces for lateral motion, especially in various consumer and industrial applications. Summary of the invention

[0004] The present application relates to a motor. In some embodiments, the present application includes a planar vibration motor for a handheld device, and a handheld device equipped with the planar vibration motor. In some examples, these handheld devices can be toothbrushes or razors.

[0005] In one embodiment, an armature is provided, including a main body and a shaft connected to the main body. A stator assembly is further provided, including a first stator, a second stator and a stator support, wherein the first stator and the second stator are separated by the stator support, thereby defining a space, allowing the armature main body to move freely in the parallel magnetic field generated between the stators, and one or more elastic connecting members (a) directly or (b) indirectly connect the armature to the stator assembly through a third body fixed to the stator assembly, thereby achieving frictionless vibration of the armature in a plane of motion substantially perpendicular to the direction of the magnetic field.

[0006] In a further embodiment, the armature includes one or more bearings that assist the elastic connector by limiting the tilt of the armature relative to a plane perpendicular to the direction of the magnetic field to achieve frictionless vibration. One or more elastic connectors can be connected to the stator assembly through one or more stator supports. The bearing can be a rotary bearing coaxial with or arranged perpendicular to the axis, or a linear bearing arranged parallel to the plane of motion of the armature. In some embodiments, the armature includes a coil, the stator assembly includes one or more permanent magnets, and the first and second stators are coupled to form parallel magnetic lines of force that pass perpendicularly through the coil. In addition, the armature may also include one or more permanent magnets, and the stator assembly may include a coil so that the magnetic field lines always remain parallel when passing through the coil.

[0007] Some embodiments include a sensor for detecting the tilt of the armature relative to a plane perpendicular to the magnetic field direction caused by an external force acting on the shaft. Such a motor can be integrated into various handheld devices and located within a handle housing.

[0008] As an application example, a toothbrush integrates this planar vibration motor, equipped with a motor drive and a detachable brush head, and the planar vibration motor provides planar motion for the brush head. This toothbrush can also include bearings to limit the armature tilt caused by external forces acting on the brush head, and can also be configured with a drive with a position sensor to monitor the tilt of the armature relative to the stator assembly.

[0009] As another example of application, a razor includes a planar vibrating motor and a cutting tool, which work together. The razor may include a blade box with a static toothed blade and a dynamic toothed blade, and the dynamic toothed blade is detachably connected to the motor through an adapter. Optionally, the dynamic or static toothed blade can be coated with a PVD coating, and an adapter magnet in the blade box can enhance the connection between the blades.

[0010] The control method of certain embodiments involves monitoring the inclination of the armature, activating the motor when the inclination exceeds a preset threshold, and deactivating the motor when the inclination is below another preset threshold. The two preset thresholds can be the same. The method may include the step of gradually adjusting the motor power based on the time after reaching the threshold or based on the inclination measurement results.

[0011] The configuration of the present application is conducive to achieving highly adaptable, efficient and controllable motor operation, with a wide range of applications, and at the same time has the advantages of quieter operation, higher comfort, stronger performance efficiency and simpler structural design achieved through a planar vibration motor.

[0012] Other objects, features and advantages of the present application will become apparent from the following detailed description, which illustrates by way of example the principles of the invention.

[0013] BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention can be better understood through the following description and accompanying drawings, in which like numbers represent like parts, as described below:

[0015] FIG. 1 is a side view of an exemplary embodiment of a planar vibration motor of the present invention, with selected cross-sectional components highlighted to show its internal structure in detail.

[0016] FIG. 2 is an exploded view of the planar vibration motor shown in FIG. 1 , showing in detail the arrangement and assembly of its components.

[0017] FIG. 3 illustrates how the elastic connector is directly fixed to the stator assembly in the planar vibration motor in FIG. 1 , showing the specific connection method.

[0018] FIG. 4 shows the inclination of the armature relative to the stator in the planar vibration motor in FIG. 1 .

[0019] FIG. 5 is a side view of an exemplary embodiment of a planar vibration motor having a modified design.

[0020] FIG. 6 is an exploded view of the planar vibration motor shown in FIG. 5 , showing in detail the differences in component design and assembly from the first embodiment.

[0021] FIG. 7 shows how the elastic connection and bearings constrain the armature in the planar vibration motor shown in FIG. 5 to achieve its frictionless planar motion.

[0022] FIG. 8 is a partial side view of an exemplary embodiment of a toothbrush incorporating a planar vibrating motor according to the present invention, showing how the motor is integrated into the toothbrush design.

[0023] FIG. 9 is an exploded view of the toothbrush shown in FIG. 8 , showing in detail the internal components of the toothbrush and their assembly.

[0024] FIG. 10 is a partial side view of an exemplary embodiment of a shaver to which the planar vibration motor of the present invention is applied.

[0025] FIG. 11 is an exploded view of the razor shown in FIG. 10 , showing in detail how the components are assembled and operate within the razor.

[0026] FIG. 12 is an exploded view of the planar vibration motor of the shaver in FIG. 10 .

[0027] 13 is a side view exemplary embodiment of a planar vibration motor with a modified design.

[0028] FIG. 14 is an exploded view of the planar vibration motor of FIG. 13 , showing in detail how its component design and assembly differ from the embodiments of FIG. 1 and FIG. 5 .

[0029] DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0030] The terms used herein are intended to describe embodiments, not to limit the scope. The singular forms "a", "an", and "the" may include plural references unless the context clearly dictates otherwise. The terms "include", "comprises", "contains", and "have" indicate the inclusion of the described features or components without excluding others. The order of the described method steps and processes does not imply a necessary order unless otherwise specified, and alternative or additional steps may be combined. When referring to elements being "connected", "engaged" or "coupled" to other elements, direct connections or the presence of intermediate elements may be included, that is, each term may include direct connections and indirect connections. When these terms are preceded by "directly", there are no intermediate elements. The term "and / or" covers a combination of one or more related listed items.

[0031] Numerical descriptors such as "first", "second", "third", etc. are used for identification and distinction and do not imply a particular order. Spatial terms such as "inner", "outer", "left", "right", etc. are used to describe positions relative to other components, as shown in the figures, but may vary due to different orientations of the device in use. The term "approximately" allows variations within the range of ±10% of the stated value, recognizing a reasonable level of accuracy within the professional field. The information and references contained in this section are for illustrative purposes only and should not be considered as limiting the definition of the scope of the claims. This description does not include all possible embodiments because it is impractical; instead, it includes permissible changes, deletions, and substitutions understood by those skilled in the art. Each figure and its elements are consistently referenced in the description unless otherwise specified. This disclosure, together with the accompanying drawings, provides a comprehensive understanding of the embodiments and conveys the scope of the invention to professionals in the field. The information, data or specifications contained in this section, including any references cited and their descriptions or discussions, are for illustrative purposes only and should not be considered as defining the scope of the invention.

[0032] FIG. 1 shows an exemplary implementation of a planar vibration motor 02 of the present invention. The motor 02 can generate a planar oscillating motion through a shaft 112. Referring to FIG. 2, a detailed exemplary implementation of the planar vibration motor 02 in FIG. 1 includes a stator assembly 100 having a first stator 102, a second stator 104, an armature 106, a position sensor 180, longitudinally arranged elastic connectors 108a / 108b, three sets of stator supports 110a / 110b, 134a / 134b, 136a / 136b, and a shaft 112 having an anti-rotation surface 112a and an anti-slip groove 112b. The stator supports 110a / 110b, 134a / 134b, 136a / 136b are provided.

[0033] 136a / 136b can be a support structure for separating the first stator 102 and the second stator 104 to resist the magnetic attraction between them. These supports, as well as the positioning cutouts 138a / 138b and 140a / 140b, and the first and second pairs of middle cutouts 130a / 130b, 132a / 132b, form a fixing mechanism to ensure that the first stator 102 and the second stator 104 can be fixed to resist the magnetic force between them. In some embodiments, welding or bonding methods can be used to enhance the fixing of the first stator 102 and the second stator 104.

[0034] The first stator 102 and the second stator 104 are substantially flat, elongated, and spaced apart from each other in parallel. The first stator 102 may include a first stator back plate 114 having a sensor mounting hole 114a for mounting the position sensor 180 and a pair of magnets 118a / 118b. The second stator 104 may include a second stator back plate 116 and a pair of magnets 120a / 120b. The two pairs of magnets may be made of any suitable material, such as NdFeB, and are elongated, flat, and magnetized perpendicular to the stator back plates 114 and 116. The orientation of the magnets is shown in FIG2. The magnets may be spaced apart laterally and securely fixed to their respective stator back plates by an adhesive such as glue or a mechanical mechanism.

[0035] In some embodiments, the stator back plates 114 and 116 are cold-formed metal sheets, including first and second pairs of intermediate cutouts 130a / 130b, 132a / 132b, stator supports 134a / 134b and 136a / 136b, and positioning cutouts 138a / 138b and 140a / 140b. The armature 106 includes an armature coil 122, a coil support 124, a shaft 112 extending or fixed thereon, and a bearing 126. The sensor trigger 178 is fixed to the coil support 124, for example, on the side of the coil support 124 facing the position sensor 180. The armature coil 122 and the coil support 124 can be substantially elongated, flat, and of similar thickness. The armature coil 122, taking a coreless coil as an example, includes two relatively long sides 128a / 128b, and these longer sides 128a / 128b are parallel to the shaft 112. The elastic connector 108a / 108b can be a curved, elongated metal object produced by stamping or other cold forming methods. The stator support 110a / 110b can be made of metal or plastic. The shaft 112 can be made of metal or non-metallic material and fixed to the coil support 124 by fasteners (mechanical or other means), insert molding or injection molding. The armature coil 122 can be made of self-adhesive magnetic wire with a rectangular cross-section. The coil support 124 can be made of metal such as aluminum or non-metallic material such as plastic or carbon fiber, and can be produced by plastic injection molding, and the armature coil 122 is firmly fixed on it.

[0036] The elasticity of the elastic connector 108a / 108b may depend on the material and structure. The elastic connector 108a / 108b can be made of metal materials such as stainless steel and copper alloys or non-metallic materials such as polymers (PU, POM) and rubber, and may be reinforced with fibers. In terms of structural factors, the curvature and deflection of the slender object may affect the elasticity. The elasticity of the elastic connector 108a / 108b will affect the position retention, amplitude and operating frequency of the armature 106. The elasticity of the elastic connector 108a / 108b may continuously push the armature 106 to move toward its center plane, thereby affecting the oscillation of the armature 106, especially the resonant oscillation.

[0037] An exemplary embodiment involves using the armature coil 122, the shaft 112 and the bearing 126, as well as the elastic connector 108a / 108b and the stator support 110a / 110b as inserts, and reliably connecting them to the coil support 124 through an injection molding process. In this case, the elastic connector 108a / 108b can be pre-fixed to the stator support 110a / 110b by mechanical connection or injection molding. The stator support 110a has a first set of matching ends 142a / 142b, and the stator support 110b has a second set of matching ends 144a / 144b, each set of which is geometrically matched with the middle cutout 132a / 132b. When the stator support 110a is fixed to the middle cutout 130a / 132a, the stator support 110b is fixed to the middle cutout 130b / 132b, and the stator supports 134a / 134b and 136a / 136b are fixed to the second pair of positioning cutouts 140a / 140b and the first pair of positioning cutouts 138a / 138b, respectively, the first stator 102 and the second stator 104 are symmetrically positioned around the armature 106. At the same time, one magnet 118a of the first pair of magnets, one magnet 120a of the second pair of magnets, and one side long side 128a of the armature coil 122 are roughly aligned in the laminar direction, and the other magnet 118b of the first pair of magnets, the other magnet 120b of the second pair of magnets, and the other side long side 128b of the armature coil 122 are also roughly aligned in the laminar direction.

[0038] The first stator 102 and the second stator 104 are coupled together to form a specific magnetic field interaction around the armature 106. The magnetic field lines from the magnet 118a to the magnet 120a will pass along one side long side 128a of the armature coil 122 in one direction, while the magnetic field lines from the magnet 118b to the magnet 120b will pass along the other side 128b of the armature coil 122 in the opposite direction.

[0039] This arrangement may be useful for generating the electromagnetic forces required to promote the planar motion of the armature 106. In some embodiments, the first stator 102 and the second stator 104 are designed to be identical or substantially identical and are symmetrically mounted around the armature coil 122. This symmetry may help balance the forces and ensure smooth operation of the motor.

[0040] The elastic connectors 108a / 108b are components that connect the armature 106 to the stator assembly 100, such as directly or at least without the use of a third party connection, and / or indirectly through a third party, as described in FIG. 13. These connections may facilitate or even enable frictionless movement of the armature within a defined plane. These elastic connectors 108a / 108b may be made of sheet metal and attached to the armature 106 in a manner such that its thickness is parallel to the magnetic field. This orientation may help maintain the integrity of the structure and the responsiveness of the motion mechanism.

[0041] In an exemplary embodiment, as shown in Figures 1 and 2, the resilient connectors 108a / 108b are directly fixed to the side walls 116a / 116b of the stator back plates 114 / 116. In Figure 3, these connections are further shown in detail, showing that the support members are fixed to the side walls by four rivets 176, providing a strong and reliable mechanical connection.

[0042] In order to detect the inclination of the armature 106 relative to the stator back plate 114 / 116, a position sensor 180 is used. Depending on the specific application requirements, the sensor can be a Hall sensor, a capacitive sensor, or an inductive sensor. The choice of sensor type affects the design of the sensor trigger 178, which can be made of materials such as magnets, metals, or plastics, each of which is suitable for different types of sensors and trigger mechanisms.

[0043] The assembly process of the planar vibration motor 02 is shown in Figure 1 and can be completed in detail through the following steps:

[0044] Step 1: Install the stator

[0045] A first pair of magnets 118a / 118b is secured to the back plate 114 of the first stator.

[0046] The second pair of magnets 120a / 120b is secured to the back plate 116 of the second stator. This can be done before, at the same time as, or after securing the first pair of magnets 118a / 118b to the first stator back plate 114.

[0047] These mounting steps help position the magnetic components correctly to generate the magnetic field required for the motor to operate.

[0048] Step 2: Install the Armature

[0049] After the stator is installed, the bearing 126 on the shaft 112 is installed onto the shaft.

[0050] The resilient connector 108a / 108b is fixed to the stator support 110a / 110b by injection molding or mechanical fasteners.

[0051] The shaft 112, bearing 126, armature coil 122 and elastic connector 108a / 108b are combined with the coil support 124, and the armature 106 is assembled by plastic injection molding. In this process, the sensor trigger 178 can be mounted on the coil support 124 or directly protruded from it according to design requirements.

[0052] Step 3: Assemble the Planar Vibration Motor

[0053] After the armature is installed, the armature 106 is placed on the first stator 102. In this configuration, the stator support 110a / 110b can be inserted into the first pair of middle cutouts 130a / 130b. The first set of adapter ends 142a / 142b of the stator support can be inserted into the first pair of middle cutouts 130a / 130b.

[0054] The second stator 104 is placed on the armature 106, and the back plate 116 of the second stator is connected to the back plate 114 of the first stator and the stator support 110a / 110b. In this configuration, the stator support 134a / 134b can be inserted into the second pair of positioning cutouts 140a / 140b, and the stator support 136a / 136b can be inserted into the first pair of positioning cutouts 138a / 138b.

[0055] A second set of mating ends 144a / 144b of the stator support 110a / 110b may be mounted in a second pair of the intermediate cutouts 132a / 132b to prevent lateral movement of the stator support 110a / 110b.

[0056] A position sensor 180 is mounted on the first stator back plate 114 through the sensor mounting hole 114a. This sensor can be functionally coupled with the sensor trigger 178 to detect and control the tilt of the armature.

[0057] Although the above steps 1-3 are described in sequence and the sub-steps are also arranged in sequence, the method within the scope of the present disclosure can be understood by technicians that the steps can be performed in any reasonable order to achieve the desired planar vibration motor 02.

[0058] The operation of the planar vibration motor 02 is described as follows, involving multiple interacting mechanisms and components to produce the desired motion. An example of the operation of the planar vibration motor 02 is as follows:

[0059] 1. The armature coil is energized:

[0060] When the armature coil 122 is energized, current flows through its longer long sides 128a / 128b. These currents intersect the magnetic field lines due to the arrangement of magnets in the stators (first stator 102 and second stator 104).

[0061] According to the Lorentz force law, a force perpendicular to the direction of the current flow and the magnetic field (transverse force) is exerted on the armature 106. This force causes the shaft 112 to move within the constraints imposed by the elastic connection 108a / 108b.

[0062] 2. Shaft vibration

[0063] By applying bi-directional current pulses or bipolar PWM (pulse width modulation) drive signals, the armature 106 is caused to vibrate. This vibration occurs in the plane of motion defined by the elastic connections 108a / 108b, which are designed to allow this motion while controlling the trajectory of the motion.

[0064] 3. Tilt and motion control:

[0065] Due to the flexibility of the elastic connection 108a / 108b, the armature 106 can be tilted relative to a reference plane perpendicular to the magnetic field or the plane of motion in the absence of lateral forces. This tilting is illustrated in FIG.

[0066] The bearing 126 helps achieve this frictionless planar motion, e.g., 100% frictionless or nearly 100% frictionless planar motion and / or vibration, by limiting excessive tilt of the armature 106. In some applications, such as electric shavers, the bearing may be omitted if tilt control is not critical or the bearing is not required. In this case, these embodiments will use the resilient connector 108a / 108b to provide the necessary motion control.

[0067] In other applications, such as electric toothbrushes or any application where it is important to control the amount of tilt, a bearing 126 may be included. The bearing 126 limits the tilt by, for example, contacting the first stator back plate 114 or, for example, the second stator back plate 116, or by contacting another surface locked to the stator assembly 100, depending on the direction and degree of tilt.

[0068] In addition, the process may include monitoring and measuring changes in inclination; activating motor power when the inclination exceeds a preset value; and shutting down motor power when the inclination falls below a preset value. This may specifically include gradually increasing motor power when the inclination exceeds a preset value, and gradually reducing power to a stop when the inclination falls below a preset value. The monitoring and measurement of changes in inclination may be performed in real time or near real time so that power is changed when the inclination changes or reaches a preset threshold.

[0069] In the current configuration, the bearing 126 is a swivel ball bearing designed to limit tilt and facilitate frictionless planar motion. It can be placed between two parallel surfaces, which can be provided directly or indirectly by the stator back plate 114 / 116 or an equivalent structure attached to the stator assembly 100. The outer diameter of the bearing 126 may be less than the distance between these surfaces. As shown in FIG. 4, the bearing 126 may be constrained by the stator back plate 114 surface at the contact point 182.

[0070] The rotary bearing 126 has control advantages, for example, other bearings such as linear bearings will significantly restrict tilt while facilitating frictionless planar motion of the armature 106, making it difficult to measure lateral forces using the position sensor 180. Therefore, the described configuration facilitates frictionless planar motion of the armature while still allowing the position sensor 180 to measure changes in tilt.

[0071] Sensing and control mechanism:

[0072] Position sensor 180 is used to measure inclination or detect lateral forces applied to shaft 112, such as by measuring the inclination of the armature relative to stator assembly 100 or the inclination relative to a plane perpendicular to the magnetic field due to external forces. The sensor can generate signals reflecting these parameters.

[0073] For many applications, continuous monitoring of tilt or force is unnecessary or unused. Instead, a pulse or step signal from position sensor 180 is sufficient. For example, a capacitive sensor may output a high or low voltage signal when the tilt exceeds a preset threshold.

[0074] The motor 02 can be programmed to start when the leading edge of a pulse or step signal is detected and to stop after a preset time or when another signal is detected.

[0075] The operation highlights the unique design and capabilities of the Planar Vibration Motor 02, which enables precise motion and force control in a variety of consumer and industrial applications. The combination of sensors and elastic supports makes the motor operation adaptable, efficient and controllable for a wide range of uses.

[0076] In a specific embodiment of the planar vibration motor 02 , the second stator 104 may omit the second pair of magnets 120 a / 120 b .

[0077] Fig. 5 shows an exemplary embodiment of a planar vibration motor 02, which provides a planar oscillating motion through a shaft 112. Fig. 6 and Fig. 7 describe this embodiment in detail, which includes a first stator 102, a second stator 104, an armature 106, vertically placed elastic connecting members 109a / 109b, stator supports 110a / 110b, 134a / 134b, 136a / 136b, and a connecting ball 112c on the shaft 112, and a bearing 126 is installed at the tail of the armature.

[0078] The first stator 102 has a first stator back plate 114 with a first pair of middle cutouts 130a / 130b and a first coil 150 with a first pair of long sides 154a / 154b parallel to the axis 112. Similarly, the second stator 104 has a second stator back plate 116 with a second pair of middle cutouts 132a / 132b and a second coil 152 with a second pair of long sides 156a / 156b parallel to the axis 112. The first stator back plate 114 and the second stator back plate 116 can be flat, elongated, and can be made of soft magnetic materials, such as mild steel or ferritic stainless steel sheet metal. The first coil 150 and the second coil 152 are also flat, elongated, and firmly attached to their respective stator back plates. In some embodiments, the first stator 102 and the second stator 104 are identical or nearly identical in size and function, and are symmetrically placed on the midplane of the armature 106.

[0079] The armature 106 includes a pair of armature magnets 146a / 146b, a magnet holder 148, and a shaft 112 fixed to the magnet holder. The armature magnets 146a / 146b are permanent magnets made of Nd-Fe-B or similar materials. The magnet holder 148 can be made of metal or plastic by injection molding process and is used to fix the armature magnets. These magnets and the holder are flat and long strips with similar thickness.

[0080] The armature magnets 146a / 146b can be secured to the magnet holder 148 by various methods, including bonding, mechanical fasteners, or as an injection molded embedded component. In addition, each armature magnet (146a or 146b) can include two identical layers that are magnetically bonded together and secured to the magnet holder 148. As shown in FIG6 , the magnetic poles of the armature magnets 146a / 146b are in opposite directions.

[0081] The shaft 112, having a connecting ball 112c, is made of metal and is fixed to the magnet holder or extends directly from the holder. The elastic connecting member 109a / 109b can be a U-shaped metal member stamped from a metal sheet. The stator support member 110a / 110b can be made of metal or plastic.

[0082] In the described arrangement, the support structure of the stator helps maintain the structural integrity and alignment of the internal components of the planar vibration motor 02. For example, the following configuration may be employed:

[0083] The stator support 110a may be positioned within the middle cutout 130a of the first stator and the middle cutout 132a of the second stator.

[0084] The stator support 110b can also be positioned in the middle cutout 130b of the first stator and the middle cutout 132b of the second stator. This configuration helps stabilize and fix the position of the stator relative to the armature. In addition, the stator supports 134a / 134b are respectively fixed in the second pair of positioning cutouts 140a / 140b, and the stator supports 136a / 136b are respectively fixed in the first pair of positioning cutouts 138a / 138b. This precise support placement can ensure that the first stator 102 and the second stator 104 are symmetrically distributed around the armature 106, thereby facilitating balanced operation of the motor. In addition, the alignment of the coils and magnets can achieve optimal magnetic field interaction, for example:

[0085] One long side (154a) of the first coil 150 and one long side (156a) of the second coil 152 are aligned with the center of the armature magnet 146b.

[0086] Similarly, the other long side (154b) of the first coil 150 and the other long side (156b) of the second coil 152 are aligned with the center of the armature magnet 146a. This center overlap of the coils and magnets can achieve efficient magnetic force generation and transmission, promoting the expected oscillating movement of the armature within the motor structure. This configuration ensures that the motor operates efficiently and has the expected mechanical precision.

[0087] In a variation of the embodiment shown in FIG. 1 , two vertically arranged resilient connectors 109 a and 109 b are placed at the front end of the armature 106. These supports may help maintain the alignment of the armature and promote its frictionless planar motion. A bearing 126 is mounted at the rear end of the armature 106 to further assist in this motion.

[0088] As shown in Fig. 7, one end of the U-shaped elastic connector 109a / 109b is fixed to the magnet fixing frame 148, and the other end is fixed to the first stator back plate 114. The connection with the magnet fixing frame 148 can be achieved by injection molding or using mechanical fasteners, and the connection with the first stator back plate 114 can be fixed by welding.

[0089] As shown in FIG5 , the assembly process of the planar vibration motor 02 includes the following steps: Step 1: Assembling the stator The first coil 150 is firmly fixed on the first stator back plate 114 using an adhesive, and the second coil 152 is fixed on the second stator back plate 116. In this way, the assembly of the first stator 102 and the second stator 104 is completed.

[0090] Step 2: Constructing the Armature The armature 106 is constructed primarily by an injection molding process. During the injection molding process, the elastic connectors 109a / 109b and the shaft 112 are inserted into the mold. The armature magnets 146a / 146b are secured to the magnet holder 148 using an adhesive. The bearings 126 are secured to the magnet holder 148 by fasteners, welding, or as inserts during the injection molding process. The shaft 112, including the connecting balls 112c, can also be extruded from the magnet holder 148 during the injection molding process.

[0091] Step 3: Assembling the planar vibration motor Place the assembled armature 106 on the first stator 102. Use spot welding to fix the free ends of the elastic connectors 109a / 109b to the first stator back plate 114. Install the stator supports 110a / 110b in the corresponding pair of middle cutouts 130a / 130b. Position the second stator 104 on the armature 106 to ensure that all stator supports 110a / 110b, 134a / 134b, and 136a / 136b match the middle cutouts 132a / 132b and the positioning cutouts 138a / 138b, and 140a / 140b, respectively.

[0092] Although the above steps 1-3 are described in sequence and the sub-steps are also performed in sequence, the method within the scope of the present disclosure can be understood as a skilled technician can perform these steps in any reasonable order to achieve the desired planar vibration motor 02. This structured approach can ensure that the motor is assembled accurately and efficiently, thereby promoting optimal performance and reliability.

[0093] As shown in FIG5 , the operation process of the planar vibration motor 02 is as follows: Operation process of the planar vibration motor 02: Coil energization: Use bipolar pulse voltage or pulse width modulation (PWM) to energize the first coil 150 and the second coil 152. This will generate magnetic fields passing through the first and second coils in opposite directions.

[0094] Oscillation mechanism: When the two coils are simultaneously supplied with bipolar pulse voltages, the electromagnetic force generated causes the armature 106 to oscillate along the plane defined by the elastic connector 109a / 109b and the bearing 126.

[0095] Frequency and Amplitude Control: The motor can be operated at a specific resonant frequency to obtain a higher amplitude, or at a non-resonant frequency to reduce the amplitude. The resonant frequency can be adjusted by changing the total mass of the armature 106 or modifying the stiffness of the elastic connection 109a / 109b. This method allows precise control of the oscillatory motion of the motor so that it can be adjusted to the desired motion amplitude and frequency for a specific application.

[0096] FIG8 shows an exemplary embodiment of a toothbrush 04 designed according to the present application. The toothbrush is provided with a handle 158 and a detachable brush head 160, which is connected to the shaft 112 of the planar vibration motor 02 in the handle 158. The brush head 160 can perform a planar oscillating motion. The included planar vibration motor 02 can be configured as in FIG1, or as in FIG5, or any combination of the two.

[0097] As shown in FIG9 , the toothbrush 04 includes a plurality of components: a brush handle 158: which can be used to wrap the planar vibration motor 02, including a handle housing 162, a motor driver 164, a battery 166 and a fixed frame 168. Seals: The front seal 172 and the rear seal 174 can effectively ensure waterproofness. The front seal ring 172 has a sealing housing end 172a and a sealing shaft end 172b, which are respectively adapted to the handle housing 162 and the shaft 112 to ensure a sealed connection. The rear seal 174 generally uses an O-ring. An internal space 170: defined by the handle housing 162 and the front and rear seals, accommodating the battery 166, the motor driver 164 and the planar vibration motor 02. The shaft 112 of the motor extends outside the internal space 170 through the front seal 172. This configuration not only ensures that the toothbrush is waterproof and fully functional, suitable for daily use, but also enables the brush head 160 to perform an effective planar oscillating motion, thereby improving the cleaning effect. The handle housing 162 can be a hollow object with a fully open bottom 162a and a partially open top 162b, and can be made of plastic, metal or ceramic. The front seal 172 and the rear seal 174 can be made of rubber or flexible plastic. The fixed frame 168 includes a motor cavity 190 for accommodating the planar vibration motor 02 and a battery cavity 192 for accommodating the battery 166. The fixed frame 168 can be manufactured by an injection molding process. The handle housing 162 and the fixed frame 168 are basically cylindrical and have matching sizes so that the fixed frame 168 can be inserted into the internal space 170 and fixed to the handle housing 162 by mechanical fixing devices such as a press fit mechanism, or laser and ultrasonic welding.

[0098] The description of the planar vibration motor 02 of the toothbrush 04 can refer to the exemplary embodiment of the planar vibration motor 02 of FIG. 1. The brush head 160 includes a head body 184 and a bristle bundle 186 firmly attached to the head body 184. The brush head 160 can be made of injection molded plastic, but other suitable materials can also be used. The head body 184 includes an axis receiver 188 that is geometrically matched with the reversing surface 112a and the anti-skid groove 112b, through which the brush head 160 cannot rotate freely and is easily detached from the axis 112.

[0099] The motor driver 164 includes a printed circuit board (PCB) 194, a microcontroller unit (MCU) 196, a sensor chip 198 and a position sensor 180. The position sensor 180 can be a capacitive sensor, an inductive sensor or a Hall sensor. In this example embodiment, the position sensor 180 is a capacitive sensor, including a moving electrode 200, a static electrode 202 and an insulating layer 201. Both the moving electrode 200 and the static electrode 202 are conductive, and the insulating layer 201 is integrated into a capacitor. The moving electrode 200 is made of a deformable material such as a sheet metal material. The moving electrode 200 or the static electrode 202 (or both) can be grounded. When the force applied to the bristle bundle 186 is large enough, the sensor trigger 178 may deform the moving electrode 200, thereby changing the capacitance of the position sensor 180. This capacitance change will be detected by the sensor chip 198 and will send a signal to the MCU196 in the form of its internal algorithm. The signal can indicate that the force applied to the bristle bundle 186 or the tilt of the shaft 112 relative to the brush handle 158 exceeds the threshold E.

[0100] The assembly process of the exemplary embodiment of the toothbrush 04 shown in FIG8 is as follows:

[0101] Step 1: Place the planar vibration motor 02 into the motor cavity 190 and the battery 166 into the battery cavity 192 ; then fix the motor driver 164 to the fixed frame 168 ; then place the front seal 172 and the rear seal 174 onto the fixed frame 168 .

[0102] Step 2: Insert the assembled fixing frame 168 from the completely opened bottom 162a into the internal space 170, the top of the fixing frame will stop at the partially opened top 162b, the sealing shaft end 172b extends from the partially opened top 162b, and the sealing shell end 172a remains in the handle housing 162. Then, the assembled fixing frame 168 can be firmly fixed by the buckle press-fit mechanism of the handle housing 162, welding or bonding.

[0103] Step 3: Push the brush head 160 onto the handle 158 and connect it to the shaft 112. At this point, this embodiment of the toothbrush 04 is completed. Although the steps 1-3 described above are performed in sequence, and the sub-steps are also performed in sequence, the method within the scope of the present disclosure can be understood as a professional with the technology can perform these steps in any reasonable order to achieve the desired planar vibration motor 02.

[0104] The operation process of the above-mentioned toothbrush 04 example embodiment can be described as follows: once the brush head 160 and the bristle bundle 186 contact the surface of the teeth or other objects, the sensor trigger 178 will leave the moving electrode 200. Therefore, the capacitance of the position sensor 180 suddenly increases, and sends a continuous signal (such as a high-level voltage) to the MCU 196, activating the planar vibration motor 02 to start working. Then, the tip of the bristle bundle 186 moves along the tooth surface under the planar power drive to clean. The position sensor will interrupt the signal transmission and send a low-level voltage to the MCU 196 to stop the planar vibration motor 02. However, for a better user experience, after the MCU 196 receives the signal from the position sensor 180, the start and stop may not be realized immediately, and the start or stop may be delayed, or it may be carried out in an increasing or decreasing manner, such as a PWM form of control program to control the power.

[0105] In the exemplary embodiment of the toothbrush 04 shown in Figures 8 and 9, the toothbrush is designed to operate without a switch and allows the brush head to move in a plane. This design not only improves the convenience of the user, but also increases the waterproof performance of the device, which is very suitable for the humid environment during oral care.

[0106] Further advantages described by the toothbrush are as follows:

[0107] (1) Switchless operation: The toothbrush 04 does not have a traditional mechanical power switch, but instead utilizes a position signal sensor 180 integrated with a control logic unit (MCU) 196. This setting enables the toothbrush to automatically activate or shut down based on a specific position signal, such as when the brush head 160 contacts or leaves the teeth.

[0108] (2) Planar motion of the brush head: The planar vibration motor 02 moves the brush head 160 in one plane, providing effective cleaning through a back-and-forth motion, which is different from the typical rotational motion of many electric toothbrushes.

[0109] (3) Waterproof design: Since there is no mechanical switch, there is no third water leakage channel except the two sealed ends of the handle housing 162. In addition, the switch-free feature facilitates the use of metal materials to manufacture the handle housing 162.

[0110] (4) Additional functions of the MCU and sensor configuration: Force detection: The system can detect the force applied when brushing, which is very useful for providing brushing power on demand. Irritation reduction: Transitioning from one side of the mouth to the other when brushing can cause irritation to the teeth. Through the control logic of the position sensor 180 and the MCU 196, irritation can be reduced by adjusting the power during the transition.

[0111] (5) Non-switchless operation alternatives: Although one design described is switchless, alternatives using tactile switches can also be used. Such designs are suitable for users who prefer to turn the device on and off through physical interaction and may provide advantages to these users.

[0112] As shown in FIGS. 5 and 6 , an exemplary embodiment of the planar vibrating motor 02 may also replace the motor in the toothbrush 04 .

[0113] FIG10 shows an exemplary embodiment of a shaver 06 according to the present invention. The shaver 06 includes a planar vibration motor 02 and a blade assembly 204, and the blade assembly 204 is detachably connected to the motor through a shaft 112 equipped with a connecting ball 112c. The included planar vibration motor 02 can be a configuration of FIG1 or a configuration of FIG5 and any combination thereof. Referring to FIG11, the detailed structure of the shaver 06 in FIG10 is shown. The shaver includes a planar vibration motor 02, a trimmer housing 206, a control unit 208, a trimmer battery 210 and a support frame 212. The trimmer housing 206 includes a housing body 214, a switch button 216, a top cover 218 with a rotation guide surface 220 and a fixing groove 222, and a housing seal 224. The housing body 214 is an elongated thin-walled object with a top opening 230 and a switch opening 232. The top cover 218 may be hollow. The housing body 214 and the top cover 218 can be made of metal or plastic by using injection molding technology. The switch button 216 can be made of rubber or soft plastic and is firmly assembled at the switch opening 232 to ensure sealing. The housing seal 224 is composed of a body seal 226 and a shaft seal 228, both of which can be made of rubber or soft plastic.

[0114] The support frame 212 is a thin-walled component that can be produced by injection molding and is designed to fit tightly into the cavity of the housing body 214. The motor chamber 234 accommodates the planar vibration motor 02, the control unit 208 is mounted on the front wall 236, and the trimmer battery 210 is fixed on the other side of the front wall.

[0115] The blade assembly 204 includes a static cutter 238 having two rows of symmetrically arranged static teeth 240 and a dynamic cutter 242 having two rows of symmetrically arranged dynamic teeth 244 .

[0116] Additional components include attachment magnet 246, attachment piece 248, clip 250, joint adapter 258, and static blade fastener 260. Clip 250 is comprised of two identical legs 252, each having a sliding surface 254 and a resilient member 256.

[0117] The static and dynamic serrated blades 238, 242 can be thin planar objects with two long parallel sides, at least one of which has teeth. The static blade can be firmly mounted on the blade assembly 204, while the dynamic blade 242 can be constrained on the static serrated blade 238, allowing free movement parallel to the long sides. The teeth of the two blades 238, 242 can be similar in number, shape and position, and aligned one by one. These teeth can have a variety of shapes, including spikes, triangles or squares.

[0118] The static serration 238, the dynamic serration 242, the attachment 248, the ball adapter 262 made of a U-shaped metal sheet, and the static blade fastener 260 may be included and may be formed of a metal plate by cold forming. The clamp leg 252 may be made of a metal plate and completed together with the static blade fastener 260, or made of plastic and fixed to the static blade fastener 260 to form the clamp 250. The attachment magnet 246 may be fixed to the static serration 238 by welding or riveting and fixed by the static blade fastener 260. The attachment sheet 248 made of a soft magnetic material (such as SUS430) is also connected to the dynamic serration 242 by welding or riveting, and the joint adapter 258 is also fixed to the attachment sheet 248. The dynamic serration 242 is connected to the blade box by the magnetic force between the attachment magnet 246 and the attachment sheet 248, so that the dynamic teeth 244 can be closely aligned and slide freely on the static teeth 240. To reduce sliding friction, a PVD coating may be applied to the static cutter 238 and / or the dynamic cutter 242 .

[0119] The sliding surface 254 of the clamp leg 252 and the rotation guide surface 220 of the top cover 218 are both cylindrical and have the same features, concentric with the ball adapter 262. The ball adapter 262 itself has a pair of spherical crowns, ideally aligned with the rotation guide surface 220 and the sliding surface 254 center.

[0120] As shown in FIG12 , the planar vibration motor 02 of the shaver 06 includes a stator assembly 100, which is composed of a first stator 102 with a first stator back plate 114 and a first coil 150, and a second stator 104 with a second stator back plate 116 and a second coil 152. The armature 106 has an armature magnet 146a / 146b fixed on a magnet fixing frame 148, the two armature magnets are placed opposite to each other, and there is a shaft 112 including a connecting ball 112c. It is worth noting that the bearing 126 is omitted in this example, which is similar to the planar vibration motor 02 in FIG5. The elastic connecting member 108a / 108b is shown in the embodiment of FIG1 .

[0121] The control unit 208 includes a control unit PCB 268 , a control MCU 266 , and a tactile switch 264 located around the switch button 216 .

[0122] The assembly process of the exemplary razor 06 is as follows:

[0123] Step 1: Fix the planar vibration motor 02 in the motor chamber 234 of the support frame 212. Step 2: Install the control unit 208 and the trimmer battery 210 on the front wall 236 and the other side of the rear wall of the support frame 212 respectively. Step 3: Install the housing seal 224 on the front end of the planar vibration motor 02, ensuring that the shaft 112 passes through the shaft seal 228 and is wrapped watertight by the seal. Step 4: Insert the support frame 212 with all accessories into the housing body 214 from the top opening 230 until it is fully in place. Step 5: Place the top cover 218 on the housing body 214 to firmly close the trimmer housing 206, ensure watertightness and form a trimmer handle. Step 6: Connect the blade assembly 204 to the trimmer handle, including the following steps: Engage the connecting ball 112c with the ball adapter 262 so that the joint adapter 258 can clamp the connecting ball 112c by elastic force so that it can move freely in the ball adapter 262. Ensure that the rotation guide surface 220 is aligned with the sliding surface 254 and can rotate freely around the connecting ball 112c. Insert the elastic member 256 into the fixing groove 222, and limit the free rotation of the blade assembly 204 around the connecting ball 112c by the elastic force between the elastic member 256 and the fixing groove 222.

[0124] Optionally, the rotating guide surface 220 and the sliding surface 254 are both spherical surfaces, which are concentrically matched with the connecting ball 112c, so that the blade box has a dual degree of freedom rotation capability. Although the above steps 1-6 are described in sequence, and the sub-steps are also performed in sequence, in the method within the scope of the present disclosure, it can be understood by those skilled in the art that these steps can be performed in any reasonable order to achieve the desired planar vibrating motor 02. The operating procedure of the described razor 06 involves a simple and effective shaving mechanism driven by the interaction between the various components of the device. The following are some operating steps and advantages of the described configuration:

[0125] 1. Start: The user presses the switch button 216. This action triggers the touch switch 264, which in turn sends a signal to the control MCU 266.

[0126] 2. Motor operation: After receiving the signal from the touch switch 264, the control MCU 266 activates the planar vibration motor 02. The motor can effectively convert electrical energy into mechanical vibration.

[0127] 3. Vibration transmission: The shaft 112 including the connecting ball 112c begins to vibrate. This vibration can directly affect the movement of the attached components.

[0128] 4. Blade movement: The vibration of the shaft 112 and the connecting ball 112c is transmitted to the dynamic tooth blade 242 through the joint adapter 258. This makes the dynamic tooth blade 242 vibrate relative to the static tooth blade 238.

[0129] 5. Cutting action: As the dynamic tooth blade 242 vibrates, it moves back and forth relative to the static tooth blade 238. The relative motion between the two tooth blades (dynamic and static) can shear the hair that enters the teeth, thereby effectively shaving.

[0130] The detailed description is intended to ensure a clear understanding of the operating mechanism without imposing unnecessary limitations on the scope of the invention. The purpose is to allow modifications and adaptations by those having skill in the art, recognizing that such variations may arise from the basic principles described herein, without departing from the spirit and scope of the invention as outlined in the appended claims.

[0131] Therefore, the invention is not limited to the specific embodiments presented, but is open to modifications within the scope of the claims, encouraging innovations and adaptations to meet various needs.

[0132] FIG13 and FIG14 show an exemplary embodiment of a planar vibration motor 02, which provides planar vibration motion through a shaft 112. As shown in FIG14, the embodiment includes a first stator 102, a second stator 104, an armature 106, an elastic connector 108, a stator support 110c / 110d, a shaft 112 and a coaxially positioned bearing 126, a vertical bearing 126a is installed at the tail of the armature, and a third body 272 has two hook pins 272a and two connecting channels 272b, which are fixed to the second stator 104. The planar vibration motor 02 is designed to withstand a lateral load F.

[0133] The first stator 102 may include a first stator back plate 114 and a pair of magnets 118a / 118b of opposite polarity fixed thereto in parallel. Similarly, the second stator 104 includes a second stator back plate 116 and another pair of magnets 120a / 120b fixed thereto. Both stator back plates are flat and made of magnetic soft material. The stator support 110c / 110d may extend from the stator back plate 114 / 116 by folding the metal sheet. The pin slots 280a / 280b on the stator back plate 114 / 116 cooperate with the stator support 110c / 110d to align the stator and the magnets in parallel. These structures maintain a magnetic balance between the stators 102 / 104 to form a parallel magnetic field. The stator assembly 100 described herein can be cross-referenced with the embodiment in Figure 1.

[0134] The armature 106 includes an armature coil 122 and a coil support 124, where the shaft 112 extends or is fixed. The armature coil 122 and the coil support 124 are both slender, flat and of similar thickness. The armature coil 122 is exemplified by a coreless coil. The coil support 124 has a bearing housing 286 with a housing cover 278 for accommodating a vertical bearing 126a, a bearing shaft 274 and a bearing stop 276. The bearing shaft 274 passes through the coil support 124 and the vertical bearing 126a and can be fixed to the stator back plate 114 / 116 through the shaft hole 282a / 282b. These components allow the armature 106 to rotate freely around the bearing shaft 274. The coil support 124 is usually made by plastic injection molding to ensure a stable connection between the armature coil 122 and the shaft 112.

[0135] The elastic connector 108 is a prefabricated strip assembly with two lugs 284, typically made of sheet metal, rubber, plastic, carbon fiber or other fiber-reinforced materials. It is fixed by inserting the lugs 284 into the hook pin 272a of the third body 272 through the connecting channel 272b. When the bearing 126 applies force, the elastic connector 108 deforms to limit the movement of the bearing away from the vibration plane perpendicular to the magnetic field. At the same time, it may apply lateral force to the center plane of the armature to help smooth or frictionless vibration. The third body 272 can be metal or non-metal and is fixed to the second stator backplate 116 by mechanical connection, welding or bonding. Thus, in some configurations, the resilient connector 108 connects the armature 106 to the stator assembly 100 including the first stator 102 and the second stator 104 via the third body 272, while in other configurations, such as certain previous embodiments of the present disclosure, the resilient connector 108 connects the armature 106 directly to the stator assembly (either not via the third body 272 at all, or via a path that is not connected to the third body 272).

[0136] The assembly process of the planar vibration motor 02 shown in FIG. 13 can be achieved by the following steps:

[0137] Step 1: Install the stator

[0138] A first pair of magnets 118 a / 118 b is secured to the first stator back plate 114 .

[0139] The second pair of magnets 120 a / 120 b is secured to the second stator back plate 116 .

[0140] Step 2: Fix the third body 272 on the second stator back plate 116 .

[0141] Step 3: Install the Armature

[0142] The bearing 126 is mounted on the shaft 112 .

[0143] The shaft 112 is combined with the bearing 126 , the armature coil 122 , and the coil support 124 by a plastic injection molding process.

[0144] Finally, the bearing 126 a , the bearing shaft 274 , the bearing stop 276 , and the housing cover 278 are installed together in the coil support 124 , thereby completing the installation of the armature 106 .

[0145] Step 4: Assemble the Planar Vibration Motor

[0146] After the armature is mounted, the armature 106 is placed on the second stator 104. In this configuration, the bearing shaft 274 fits into the shaft hole 282b. The bearing 126 is fixed to the third body 272 by the elastic connector 108.

[0147] The first stator 102 is placed on the armature 106, and the first stator back plate 114 is fixed to the second stator back plate 116 by inserting the stator supports 110c / 110d into the pin slots 280a / 280b respectively. The first stator 102 and the second stator 104 are fixed together by the magnetic force therebetween and the stator supports 110c / 110d.

[0148] Although the above steps 1-3 are listed in a sequential manner and the sub-steps are also arranged in sequence, it should be noted that a person skilled in the relevant field can perform these steps in any logical order to achieve the intended function of the planar vibration motor 02.

[0149] The operation steps of the planar vibration motor 02 are similar to the operation steps of the embodiment shown in FIG. 1 , except for the position sensor 180 .

[0150] The following is an example of the operation of the planar vibration motor 02:

[0151] 1. The armature coil is energized:

[0152] When the armature coil 122 is energized, current flows through its long sides 128a / 128b. Due to the arrangement of the magnets within the stators (first stator 102 and second stator 104), these currents intersect the magnetic field lines.

[0153] According to the Lorentz force law, a force (lateral force) perpendicular to the current direction and the magnetic field is generated on the armature 106 , which causes the shaft 112 to move within the limited range of the elastic connection 108 .

[0154] 2. Shaft Oscillation:

[0155] By using bidirectional current pulses or bipolar pulse width modulation (PWM) drive signals, the armature 106 is caused to oscillate. This oscillation occurs primarily in a plane perpendicular to the parallel magnetic field first stator back plate 114, and the elasticity of the elastic connection 108 helps to enhance the oscillation, especially at the resonant frequency. In this case, the movement of the shaft 112 involves a planar scan around the bearing axis 274 within a specific sector area.

[0156] In the case where the elastic connection is extremely soft, the bearing 126 will move along an elliptical trajectory, accompanied by a slightly tilted plane oscillation. Even without the bearing 126, the plane oscillation can work normally as long as the shaft 112 is firmly connected to the elastic connection 108 in a suitable position, such as by welding. Such a setting demonstrates the flexibility and adaptability of the design of the planar vibration motor.

[0157] 3. Start and stop control:

[0158] In order to control the start and stop of the planar vibration motor 02 , a position sensor may be added if necessary, which is similar to the embodiment in FIG. 1 .

Claims

1. A planar vibration motor, comprising: An armature consisting of a main body and a shaft connected to the main body; a stator assembly including a first stator, a second stator and a stator support, wherein the first stator and the second stator are separated by the stator support to form a space so that the armature body can move freely in a parallel magnetic field generated between the first stator and the second stator; and one or more elastic connecting members connecting the armature to the stator assembly directly or indirectly through a third party, so that the armature can oscillate frictionlessly in a motion plane substantially perpendicular to the magnetic field.

2. The planar vibration motor of claim 1, wherein the armature further comprises one or more bearings to assist frictionless oscillation by limiting the inclination of the armature relative to a plane perpendicular to the direction of the magnetic field. 3 . The planar vibration motor according to claim 1 , wherein the elastic connecting member is connected to the stator assembly through one or more stator brackets.

4. The planar vibration motor according to claim 1, wherein the armature further comprises a coil, the stator assembly comprises one or more permanent magnets, and the first and second stators are coupled so that the magnetic flux lines are parallel to each other and pass through the coil.

5. The planar vibration motor of claim 1, wherein the armature further comprises one or more permanent magnets, the stator assembly comprises one or more coils, and the positions of the stator and the armature are such that the magnetic flux lines are parallel to each other when passing through the coils.

6. The planar vibration motor of claim 1, further comprising a sensor for measuring the inclination of the armature relative to its plane of motion due to an external force applied to the shaft.

7. A toothbrush comprising: The planar vibration motor according to claim 1; a motor driver; and a brush head detachably connected to the planar vibration motor, wherein the planar vibration motor is configured to provide planar motion of the brush head.

8. The toothbrush of claim 7, wherein the armature includes a bearing that limits the inclination of a plane of motion of the armature due to an external force applied to the brush head.

9. The toothbrush of claim 7, further comprising a driver incorporating a position sensor for measuring the tilt angle of the armature relative to the stator assembly.

10. A razor comprising: The planar vibration motor according to claim 1; And a cutting device matched with the planar vibration motor, the cutting device comprises a blade box with a static tooth blade and a dynamic tooth blade, the dynamic tooth blade is connected to the planar vibration motor and is detachable.

11. A control method for a handheld device having a planar vibration motor with an armature shaft and a sensor for measuring a change in tilt due to an external force, the method comprising: Monitor and measure tilt changes; When the inclination exceeds the preset value, the motor power is turned on; And when the inclination is less than a preset value, the motor power is turned off. 12 . The control method according to claim 11 , further comprising gradually increasing the motor power over time when the inclination exceeds a preset value, and gradually reducing the power until stopping when the inclination is less than the preset value.

13. The control method of claim 11, further comprising adjusting the power supplied to the motor according to a preset value.

14. The control method of claim 11, wherein monitoring and measuring the tilt change is performed in real time.

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