CN218217073U - Micro Ultrasonic Motor - Google Patents

Abstract

A miniature ultrasonic motor comprises a shell, a central rotating shaft, a first stator core, a second stator core, a first coil, a second coil, a first magnet group and a second magnet group, wherein the central rotating shaft is rotatably connected into the shell; the second magnet group faces the second stator iron core by a single magnetic pole; when the first coil and the second coil are connected with working current, the first stator iron core and the second stator iron core generate alternate magnetic poles to interact with the first magnet group and the second magnet group so as to drive the central rotating shaft to rotate in a reciprocating manner. The utility model discloses a structure is very compact, and the design is very ingenious, does benefit to the structure miniaturization very much to can improve the vibration dynamics of motor, in addition, still be equipped with limit structure, its width of a circle that can restrict the central pivot does benefit to central pivot auto-regress.

Description

Micro Ultrasonic Motor

【Technical field】

The utility model relates to the field of motors, in particular to a miniature ultrasonic motor.

【Background technique】

With the development of the economy, electronic products are also developing rapidly, such as mobile phones, electric toothbrushes, hand-held fans and other products. While pursuing high quality, they are also increasingly required to be thinner and smaller. With the miniaturization of products, the miniaturization requirements of each original device are getting higher and higher. Existing small motors have complex structures. If the internal structure design is unreasonable, it will be difficult to miniaturize the motor, thus restricting the application scenarios of the motor. Therefore, miniaturization of motor products and maintaining or increasing the vibration strength of the motor will be the development trend of small motors.

【Content of utility model】

The utility model aims at solving the above problems, and provides a miniature ultrasonic motor with a compact structure, which is beneficial to the miniaturization of the structure, and can increase the vibration strength of the motor.

In order to solve the above problems, the utility model provides a miniature ultrasonic motor, which is characterized in that it includes a housing, a central shaft, a first stator core, a second stator core, a first coil, a second coil, a second A magnet group and a second magnet group, the central rotating shaft is rotatably connected to the housing, and one end protrudes from the housing to form an output end; the first stator core is fixed on the In the shell; the second stator core is fixed in the shell; the first coil is set on the first stator core; the second coil is set on the second stator core on the core; the first magnet group is fixed on the central shaft, and N poles and S poles are provided to face the first stator core; the second magnet group is fixed on the center On the rotating shaft, a single magnetic pole faces the second stator core; when the first coil and the second coil are supplied with operating current, the first stator core and the second stator core alternately change The magnetic poles interact with the first magnet group and the second magnet group to drive the central shaft to reciprocate.

Further, the first magnet group includes strip-shaped first magnets, second magnets, third magnets and fourth magnets, the first magnets and the second magnets are arranged adjacent to each other with different magnetic poles facing The first stator core, the third magnet and the fourth magnet are arranged adjacent to each other and face the first stator core with different magnetic poles; the first magnet, the second magnet and the third magnet The magnet and the fourth magnet are distributed symmetrically with respect to the central rotation axis.

Further, the second magnet group includes elongated fifth magnets and sixth magnets, the fifth magnets and sixth magnets are distributed symmetrically with respect to the central rotation axis, and the fifth magnets are located on the first between the first magnet and the third magnet; the sixth magnet is located between the second magnet and the fourth magnet.

Further, it also includes a first limit block and a second limit block clamped at both ends of the first magnet group and the second magnet group, the first limit block, the second limit block The block is fixedly sleeved on the central rotating shaft.

Further, the first limit block and the second limit block are respectively provided with an annular stepped groove and a central through hole, and the annular stepped groove communicates with the central through hole; There is an abutment protruding in the axial direction in the shaped stepped groove; the first limiting block and the second limiting block are fixedly sleeved on the central rotating shaft through the central through hole; the first The two ends of the magnet group are snapped into the annular stepped groove respectively; the length of the second magnet group is smaller than the length of the first magnet group, and the two ends of the magnet group respectively abut against the abutting portion catch.

Further, it also includes a support frame fixedly arranged in the housing, and one end of the support frame is provided with limiting columns arranged in parallel at intervals, and limiting holes are formed between the limiting columns; The first limit block is provided with a limit block part extending into the limit hole; when the central shaft rotates, the limit block part can rotate in the limit hole, and the limit The post can constrain the rotational amplitude of the central rotating shaft.

Further, a second stator slot extending along its length direction is provided on the support frame, the second stator slot is parallel to the central rotating shaft, and the side of the second stator slot facing the central rotating shaft has a Open shape; the second stator core is fixedly clamped in the second stator slot and fixedly connected with the support frame.

Further, a second coil slot extending along its length direction is provided on the support frame, the second coil slot is parallel to the central rotation axis, and the second coil slot penetrates through the second stator slot ; The second coil is sleeved on the second stator core and located in the coil slot.

Further, the supporting frame is symmetrically distributed on both sides of the central rotating shaft, and a slot extending along the length direction is provided on the supporting frame, and the locking slot is parallel to the central rotating shaft; the first fixed The sub-core includes a rectangular block-shaped yoke and an arc-shaped shoe. The shoe protrudes symmetrically to both sides of the yoke. The first stator core is fixedly connected between the support frames through the slots of the support frames.

Further, limit steps extending along the length direction are respectively provided on both ends of the support frame; the first coil is sleeved on the yoke of the first stator core and is located between two adjacent Between the limit steps of the support frame.

Further, when the second magnet group is facing the second stator core, the first stator core is facing the middle position of two different magnetic poles in the first magnet group.

The beneficial contribution of the utility model lies in that it effectively solves the above-mentioned problems. The miniature ultrasonic motor of the utility model is provided with two sets of stator cores, two sets of coils and two sets of magnets, wherein the first coils, the first stator cores and the first magnet sets are mainly used to drive the rotation of the central shaft and constrain The rotation angle of the central shaft; and the second coil, the second stator core and the second magnet group can be used for positioning and assisting the central rotation to increase the output torque of the motor. In addition, the utility model is provided with a limiting structure on the support frame and the first limiting block, which can restrict the rotation range of the central rotating shaft, avoid excessive twisting of the central rotating shaft, and facilitate the automatic return of the central rotating shaft. On the other hand, the utility model is provided with 6 magnets, 4 stator cores and 4 coils in a narrow space, and its structure is very compact, and its design is very ingenious, which is very beneficial to the miniaturization of the structure, and it has strong practicality. sex.

【Description of drawings】

Fig. 1 is a schematic diagram of the overall structure of the utility model.

Fig. 2 is a structural exploded view of the utility model.

Fig. 3 is a schematic cross-sectional view of the utility model.

Fig. 4 is a schematic longitudinal section of the utility model.

Fig. 5 is a schematic longitudinal section of the utility model.

Fig. 6 is a structural schematic diagram of the support frame of the present invention.

Fig. 7 is a schematic structural view of the support frame of the present invention.

Reference signs: housing 10, stepped through hole 11, stepped groove 12, end cover 13, cylinder body 14, bottom cover 15, central shaft 20, output end 21, non-output end 22, first stator core 30 , yoke 31, shoe 32, second stator core 40, first coil 50, second coil 60, first magnet group 70, first magnet 71, second magnet 72, third magnet 73, fourth magnet 74. The second magnet group 80, the fifth magnet 81, the sixth magnet 82, the support frame 90, the limiting column part 91/limiting hole 92, the second stator slot 93, the second coil slot 94, the card slot 95, the limiting Position step 96, first limit block 100, limit block portion 101, annular stepped groove 102, central through hole 103, abutting portion 104, second limit block 110, central through hole 103 bearing 120, lead wire Hole 130.

【detailed description】

The following examples are further explanations and supplements to the utility model, and do not constitute any limitation to the utility model.

As shown in Figures 1 to 7, the miniature ultrasonic motor of the present invention includes a housing 10, a central shaft 20, a first stator core 30, a second stator core 40, a first coil 50, a second coil 60, The first magnet group 70 and the second magnet group 80 . Further, it also includes a support frame 90 , a first limiting block 100 , and a second limiting block 110 .

As shown in FIGS. 1-5 , the central rotating shaft 20 is rotatably connected to the housing 10 , and one end protrudes from the housing 10 to form an output end 21 . The first stator core 30 and the second stator core 40 are respectively fixed in the housing 10 . The first coil 50 is disposed on the first stator core 30 . The second coil 60 is disposed on the second stator core 40 . The first magnet group 70 is fixed on the central rotating shaft 20 , and has N poles and S poles facing the first stator core 30 . The second magnet group 80 is fixed on the central rotating shaft 20 , and has a single magnetic pole, and the N magnetic pole or the S magnetic pole can face the second stator core 40 . When the first coil 50 and the second coil 60 are supplied with an operating current, the first stator core 30 and the second stator core 40 generate alternately changing magnetic poles and the first magnet group 70, The second magnet group 80 interacts to drive the central rotating shaft 20 to rotate back and forth.

Wherein, the interaction between the first magnet group 70 , the first stator core 30 and the first coil 50 is mainly used to drive the central rotating shaft 20 to reciprocate and to constrain the rotational amplitude of the central rotating shaft 20 . The interaction between the second magnet group 80 , the second stator core 40 and the second coil 60 is mainly used for positioning and assisting the rotation of the central rotating shaft 20 , thereby increasing the vibration force of the motor.

Further, the first magnet group 70 and the second magnet group 80 can be fixed on the central rotating shaft 20 through the first limiting block 100 and the second limiting block 110 . The first limiting block 100 and the second limiting block 110 are fixedly sleeved on the central rotating shaft 20, and clamp the first magnet group from both ends of the first magnet group 70 and the second magnet group 80 70 and the second magnet group 80 , so that the first magnet group 70 and the second magnet group 80 are fixed on the central rotating shaft 20 and can rotate synchronously with the central rotating shaft 20 .

Further, a support frame 90 is provided inside the housing 10 , and one end of the support frame 90 is provided with a limiting column portion 91 , and a limiting hole 92 is formed between the limiting column portions 91 . The first limiting block 100 is provided with a limiting block portion 101 protruding into the limiting hole 92 . When the central rotating shaft 20 rotates, the first limiting block 100 rotates synchronously, so that the limiting block part 101 can rotate in the limiting hole 92. The first limiting block 100 can be constrained by the limiting column portion 91 to a maximum rotational amplitude. Therefore, the limiting structure between the support frame 90 and the first limiting block 100 can restrict the rotation range of the central rotating shaft 20 , prevent the central rotating shaft 20 from excessively large twisting angle, and promote the automatic return of the central rotating shaft 20 .

Specifically, the central rotating shaft 20 is provided for rotation, and a stepped through hole 11 and a stepped groove 12 are respectively provided at opposite ends of the housing 10 . The stepped through hole 11 is opposite to the stepped groove 12 .

The non-output end 22 of the central shaft 20 is rotatably connected in the stepped groove 12 through a bearing 120 . The non-end portion of the central rotating shaft 20 is rotatably connected to the stepped through hole 11 through a bearing 120 . The output end 21 of the central rotating shaft 20 protrudes out of the casing 10 through the stepped through hole 11, and is used for outputting high-frequency vibrations to the outside.

In this embodiment, the housing 10 includes an end cover 13 , a cylinder body 14 and a bottom cover 15 which are mated and connected.

The stepped through hole 11 is provided on the end cover 13 . The stepped groove 12 is provided on the bottom cover 15 . The end cap 13 and the bottom cap 15 are matedly connected to the two ends of the cylinder body 14 .

The first magnet group 70 includes a strip-shaped first magnet 71 , a second magnet 72 , a third magnet 73 and a fourth magnet 74 . Wherein, the first magnet 71 and the second magnet 72 are arranged adjacent to each other, and the first magnet 71 and the second magnet 72 face the first stator core 30 with different magnetic poles. The third magnet 73 and the fourth magnet 74 are arranged adjacent to each other, and the third magnet 73 and the fourth magnet 74 face the second stator core 40 with different magnetic poles. The first magnet 71, the second magnet 72, the third magnet 73, and the fourth magnet 74 are distributed symmetrically with respect to the central rotating shaft 20, that is, the first magnet 71 and the second magnet 72 are located on the same side, and the third magnet 73 It is located on the same side as the fourth magnet 74, and the two are symmetrical to each other. Wherein, the magnetic pole distribution of the first magnet 71 may be the same as the magnetic pole distribution of the third magnet 73 , and may also be the same as the magnetic pole distribution of the fourth magnet 74 , which may be specifically set according to needs.

The distance between the first magnet 71 and the second magnet 72 , and the distance between the third magnet 73 and the fourth magnet 74 are related to the rotation angle of the central rotating shaft 20 .

The second magnet group 80 includes elongated fifth magnets 81 and sixth magnets 82 . The fifth magnet 81 and the sixth magnet 82 are symmetrically distributed relative to the central rotating shaft 20 . Wherein, the fifth magnet 81 is located between the first magnet 71 and the third magnet 73 . The sixth magnet 82 is located between the second magnet 72 and the fourth magnet 74 .

The fifth magnet 81 and the sixth magnet 82 may have the same magnetic poles facing the second stator core 40 , or may have different magnetic poles facing the second stator core 40 .

The fifth magnet 81 and the sixth magnet 82 are mainly used for positioning. When the fifth magnet 81 and the sixth magnet 82 are facing the second stator core 40, the first stator core 30 is facing the middle parts of the first magnet 71, the second magnet 72 and The middle part of the third magnet 73 and the fourth magnet 74.

The sizes and shapes of the first magnet 71 , the second magnet 72 , the third magnet 73 , the fourth magnet 74 , the fifth magnet 81 and the sixth magnet 82 can be set as required. In this embodiment, the first magnet 71 , the second magnet 72 , the third magnet 73 and the fourth magnet 74 are large magnet blocks, and the fifth magnet 81 and the sixth magnet 82 are small magnet blocks. Wherein, the lengths of the first magnet 71 , the second magnet 72 , the third magnet 73 and the fourth magnet 74 are greater than the lengths of the fifth magnet 81 and the sixth magnet 82 .

In some embodiments, the magnets in the first magnet group 70 and the second magnet group 80 can be fixed on the central shaft 20 by gluing.

In this embodiment, the first magnet group 70 and the second magnet group 80 are fixed on the central rotating shaft 20 through the first limiting block 100 and the second limiting block 110 .

The first limiting block 100 and the second limiting block 110 are in the shape of round blocks, on which are respectively provided an annular stepped groove 102 and a central through hole 103 . The annular stepped groove 102 communicates with the central through hole 103 . The central through hole 103 is used to sleeve the first limit block 100 and the second limit block 110 on the central rotating shaft 20, and its size matches the size of the central rotating shaft 20, which can be matched with the The central shaft 20 forms an interference fit. The annular stepped groove 102 is used for clamping two ends of the magnets in the first magnet group 70 . An abutment portion 104 protruding in the axial direction is provided in the annular stepped groove 102 for abutting against the magnets in the second magnet group 80 .

During installation, the first limiting block 100 and the second limiting block 110 are respectively sleeved on the central rotating shaft 20 , and form an interference fit with the central rotating shaft 20 to rotate synchronously with the central rotating shaft 20 . The two ends of the magnets in the first magnet group 70 are respectively inserted in the annular stepped groove 102, so that the first magnet group 70 can be fixed. The two ends of the magnets in the second magnet group 80 abut against the abutting portion 104 respectively, and the second magnet group 80 can be fixed by pressing the abutting portion 104 against the second magnet group 80 .

In order to make the fixing of the first magnet group 70 and the second magnet group 80 more reliable, glue can also be applied between the first magnet group 70 , the second magnet group 80 and the central rotating shaft 20 , and the glue can be used for further adhesion.

In order to constrain the rotation range of the central rotating shaft 20 and facilitate the automatic return of the central rotating shaft 20, a supporting frame 90 is also provided in the housing 10, and a limiting structure is provided on the supporting frame 90 and the first limiting block 100, It can constrain the rotation angle of the central shaft 20 .

Specifically, one end of the support frame 90 is provided with parallel and spaced limiting posts 91 . The shape of the limiting column portion 91 can be set according to requirements, and in this embodiment, it is in the shape of a square column. Limiting holes 92 are formed between the limiting posts 91 . The limiting hole 92 can be a through hole or a blind hole, which can be specifically set according to needs. In this embodiment, the limiting hole 92 is a through hole.

A limiting block portion 101 is provided on the first limiting block 100 . The limiting block portion 101 protrudes outward along the radial direction of the first limiting block 100 , and is perpendicular to the abutting portion 104 . In this embodiment, two limiting block parts 101 are symmetrically provided on the first limiting block 100 .

The limiting block portion 101 protrudes into the limiting hole 92 and can interfere with the limiting column portion 91. When the central rotating shaft 20 rotates, the first limiting block 100 rotates synchronously with the central rotating shaft 20 , so that the limiting block part 101 rotates in the limiting hole 92 . The maximum range of movement of the limiting block portion 101 in the limiting hole 92 is the position where it interferes with the limiting column portion 91 . Therefore, the limiting column part 91 cooperates with the limiting block part 101 to restrict the rotation angle of the central rotating shaft 20 , so as to prevent the central rotating shaft 20 from being twisted excessively and facilitate the return of the central rotating shaft 20 .

Further, the support frame 90 can also be used to fix the second stator core 40, the first stator core 30, the first coil 50 and the second coil 60, so as to make the structure more compact and facilitate the miniaturization of the motor . In addition, the supporting frame 90 and the first stator core 30 are braced against each other so that they can be fixed on the inner wall of the casing 10 as a whole.

Specifically, the support frame 90 is provided with a second stator slot 93 extending along its length direction. In this embodiment, the second stator slot 93 is centered on the support frame 90 and is a through-hole slot. In other embodiments, the second stator slot 93 may also be a blind hole slot. The second stator slot 93 is parallel to the central rotating shaft 20 , and a side of the second stator slot 93 facing the central rotating shaft 20 is open.

The shape of the second stator slot 93 matches the shape of the second stator core 40 . In this embodiment, the second stator core 40 is a long column with a "convex" cross section, which is formed by laminating several silicon steel sheets with the same shape. The second stator core 40 is clamped in the second stator slot 93 and fixed on the support frame 90 . The second stator core 40 faces to the second magnet group 80 and is spaced from the second magnet group 80.

The second coil 60 is sheathed on the second stator core 40 .

Correspondingly, the support frame 90 is provided with a second coil slot 94 extending along its length direction. The second coil slot 94 is parallel to the central rotating shaft 20, and the second coil slot 94 passes through the second stator slot 93. In this embodiment, the second coil slot 94 is a rectangular slot, which vertically passes through the second stator slot 93 .

When the second coil 60 is sleeved on the second stator core 40 , the second coil 60 is located in the second coil slot 94 of the supporting frame 90 . This structure also prevents loose coils.

In order to install the first stator core 30 , a slot 95 extending along the length direction is provided on the support frame 90 . The engaging slot 95 is parallel to the central rotating shaft 20 .

The shape of the clamping slot 95 matches the edge shape of the second stator core 40 . In this embodiment, the second stator core 40 includes a rectangular block-shaped yoke portion 31 and an arc plate-shaped shoe portion 32 . The boot 32 is centrally disposed on the end of the yoke 31 , and the boot 32 protrudes symmetrically to both sides of the yoke 31 . The edge of the boot 32 can be engaged in the engaging slot 95 .

Two first stator cores 30 are symmetrically arranged between two spaced supporting frames 90 . The first stator core 30 is fixedly connected to the first stator core 30 through the two side edges of the boot 32 respectively snapped into the same side slots 95 of two adjacent support frames 90 between the support frames 90 .

The two support frames 90 can be clamped to the first stator core 30, and correspondingly, the first stator core 30 can tighten the support frame 90 on the inner wall of the housing 10, so that The support frame 90 and the first stator core 30 are fixed in the housing 10 .

The first stator cores 30 respectively face to the first magnet group 70 and are spaced apart from the first magnet group 70 . The two first stator cores 30 arranged symmetrically are half-surrounded by their boots 32 outside the first magnet group 70 . When the second magnet group 80 is facing the second stator core 40, the center of the boot 32 of the first stator core 30 is facing the center of the first magnet 71, the center of the second magnet 72 and The center of the third magnet 73 and the fourth magnet 74 .

The yoke 31 of the first stator core 30 faces away from the first magnet group 70 and faces the inner wall of the casing 10 . In this embodiment, the end of the yoke 31 is in close contact with the inner wall of the casing 10 , so as to prevent the first coil 50 from falling off.

The first coil 50 is sleeved on the yoke 31 of the first stator core 30 . In this embodiment, there are two first coils 50, which are respectively arranged on the yoke 31 of the first stator core 30.

In order to further prevent the coils from falling apart and make the structure more compact, limit steps 96 extending along the length direction are respectively provided on the two ends of the support frame 90 . When the first coil 50 is sleeved on the yoke 31, the first coil 50 is located between the limiting steps 96 of two adjacent support frames 90, and the end surface of the first coil 50 can be connected with The limiting step 96 fits together.

In order to facilitate the rotation of the central shaft 20, the first magnet group 70, and the second magnet group 80, the side of the support frame 90 facing the central shaft 20 is arranged in an arc shape, and the arc of the shoe portion 32 is The surface can roughly form a cylindrical surface and surround the central rotating shaft 20 , the first magnet group 70 and the second magnet group 80 .

To facilitate wiring, a plurality of lead holes 130 are respectively provided on the support frame 90 . In this embodiment, two lead holes 130 are respectively provided on the support frame 90 . Similarly, a plurality of lead holes 130 are also provided on the housing 10 . The number and position of the lead wire holes 130 can be set according to needs, and it is suitable to facilitate the wiring of the first coil 50 and the second coil 60 .

Thus, the micro-ultrasonic motor of the present utility model is formed: the central rotating shaft 20 is rotatably connected in the housing 10, and one end protrudes from the housing 10 to form the output end 21; the first magnet group 70, the second The two magnet groups 80 are fixed on the central rotating shaft 20 through the first limiting block 100 and the second limiting block 110 at both ends thereof. The first magnet 71, the second magnet 72, the third magnet 73, and the fourth magnet 74 in the first magnet group 70 are symmetrically fixed on the central rotating shaft 20, and the first magnet 71 and the second magnet 72 are adjacent and With different magnetic poles facing the central rotating shaft 20 , the third magnet 73 and the fourth magnet 74 are adjacent and facing the central rotating shaft 20 with different magnetic poles. The fifth magnet 81 and the sixth magnet 82 in the second magnet group 80 are symmetrically fixed on the central shaft 20, and the fifth magnet 81 is located between the first magnet 71 and the third magnet 73, and the sixth magnet 82 is located between the second magnet 72 and the fourth magnet 74 . The support frame 90 is symmetrically distributed on both sides of the central rotating shaft 20, one end of which is provided with a limiting post 91 and a limiting hole 92, and the first limiting block 100 is provided with a limiting block 101, the limiting The block portion 101 can move in the limiting hole 92 and can be constrained by the limiting column portion 91 , so as to constrain the rotation range of the central rotating shaft 20 . The second stator core 40 is fixed in the second stator slot 93 of the support frame 90 , and the second coil 60 is sleeved on the second stator core 40 and located on the second side of the support frame 90 . Inside the coil slot 94. The first stator core 30 is connected to the support frame 90 by snapping the edge of the boot 32 into the slot 95 of the two support frames 90 , so that the two support each other and are fixed in the housing 10 . The first coil 50 is sleeved on the yoke 31 of the first stator core 30 and located between the limiting steps 96 of the two support frames 90 . The first stator core 30 faces to the second magnet group 80 , and the first stator core 30 faces to the first magnet group 70 . When the first coil 50 and the second coil 60 are supplied with operating current, the first stator core 30 and the second stator core 40 generate magnetic poles due to electromagnetic induction; wherein, the first stator core 30 The upper magnetic poles can interact with the corresponding magnetic poles in the first magnet group 70, so as to alternately attract/repel the N magnetic poles/S magnetic poles in the first magnet group 70, thereby driving the central rotating shaft 20 to reciprocate. The magnetic poles on the second stator core 40 can interact with the magnetic poles in the second magnet group 80 , which can serve as an auxiliary drive to increase the rotation force of the central rotating shaft 20 and can be used for positioning.

Although the utility model has been disclosed through the above embodiments, the scope of the utility model is not limited thereto. Under the condition of not departing from the concept of the utility model, the above components can be realized by similar or equivalent elements understood by those skilled in the art replace.

Claims (11)

1. A miniature ultrasonic motor, characterized in that it includes:

a housing (10);

the central rotating shaft (20) is rotatably connected in the shell (10), and one end of the central rotating shaft extends out of the shell (10) to form an output end (21);

a first stator core (30) fixedly arranged in the shell (10);

a second stator core (40) fixedly arranged in the housing (10);

a first coil (50) provided on the first stator core (30);

a second coil (60) provided on the second stator core (40);

a first magnet group (70) which is fixedly arranged on the central rotating shaft (20) and is provided with an N magnetic pole and an S magnetic pole which can face the first stator iron core (30);

a second magnet group (80) fixed to the central rotating shaft (20) and having a single magnetic pole facing the second stator core (40);

when the first coil (50) and the second coil (60) are connected with working current, the first stator iron core (30) and the second stator iron core (40) generate alternately changed magnetic poles to interact with the first magnet group (70) and the second magnet group (80) so as to drive the central rotating shaft (20) to rotate in a reciprocating manner.

2. The micro ultrasonic motor according to claim 1, wherein the first magnet group (70) includes a first magnet (71), a second magnet (72), a third magnet (73), and a fourth magnet (74) which are elongated, the first magnet (71) and the second magnet (72) are adjacently disposed and face the first stator core (30) with different magnetic poles, and the third magnet (73) and the fourth magnet (74) are adjacently disposed and face the first stator core (30) with different magnetic poles; the first magnet (71), the second magnet (72), the third magnet (73) and the fourth magnet (74) are symmetrically distributed relative to the central rotating shaft (20).

3. The micro ultrasonic motor according to claim 2, wherein the second magnet group (80) comprises an elongated fifth magnet (81) and a sixth magnet (82), the fifth magnet (81) and the sixth magnet (82) are symmetrically distributed with respect to the central rotating shaft (20), and the fifth magnet (81) is located between the first magnet (71) and the third magnet (73); the sixth magnet (82) is located between the second magnet (72) and the fourth magnet (74).

4. The ultrasonic micro-motor according to claim 1, further comprising a first limiting clamping block (100) and a second limiting clamping block (110) clamped at two ends of the first magnet set (70) and the second magnet set (80), wherein the first limiting clamping block (100) and the second limiting clamping block (110) are fixedly sleeved on the central rotating shaft (20).

5. The micro-ultrasonic motor of claim 4,

an annular stepped groove (102) and a central through hole (103) are respectively formed in the first limiting fixture block (100) and the second limiting fixture block (110), and the annular stepped groove (102) is communicated with the central through hole (103); an abutting part (104) protruding in the axial direction is provided in the annular stepped groove (102);

the first limiting clamping block (100) and the second limiting clamping block (110) are fixedly sleeved on the central rotating shaft (20) through a central through hole (103);

the end parts of the two ends of the first magnet group (70) are respectively clamped in the annular stepped groove (102);

the length of the second magnet group (80) is smaller than that of the first magnet group (70), and the end parts of the two ends of the second magnet group are respectively abutted against the abutting part (104).

6. The micro-ultrasonic motor of claim 4,

the device is characterized by also comprising a support frame (90) fixedly arranged in the shell (10), wherein one end of the support frame (90) is provided with limiting column parts (91) which are arranged in parallel at intervals, and limiting holes (92) are formed between the limiting column parts (91);

the first limiting clamping block is provided with a limiting block part (101) extending into the limiting hole (92);

when the central rotating shaft (20) rotates, the limiting block part (101) can rotate in the limiting hole (92), and the limiting column part (91) can restrict the rotating amplitude of the central rotating shaft (20).

7. The micro-ultrasonic motor of claim 6,

a second stator groove (93) extending along the length direction of the support frame (90) is arranged on the support frame (90), the second stator groove (93) is parallel to the central rotating shaft (20), and one side, facing the central rotating shaft (20), of the second stator groove (93) is open;

the second stator core (40) is fixedly clamped in the second stator slot (93) and fixedly connected with the support frame (90).

8. The micro-ultrasonic motor of claim 7,

a second coil groove (94) extending along the length direction of the support frame (90) is formed in the support frame (90), the second coil groove (94) is parallel to the central rotating shaft (20), and the second coil groove (94) is communicated with the second stator groove (93);

the second coil (60) is sleeved on the second stator core (40) and is positioned in the coil slot.

9. The micro-ultrasonic motor of claim 6,

the supporting frames (90) are symmetrically distributed on two sides of the central rotating shaft (20), clamping grooves (95) extending along the length direction are formed in the supporting frames (90), and the clamping grooves (95) are parallel to the central rotating shaft (20);

the first stator iron core (30) comprises a rectangular yoke portion (31) and arc-plate-shaped shoe portions (32), the shoe portions (32) symmetrically extend to two sides of the yoke portion (31), and edges of two sides of each shoe portion (32) are respectively clamped in clamping grooves (95) of two adjacent supporting frames (90) to enable the first stator iron core (30) to be fixedly connected between the supporting frames (90).

10. The micro-ultrasonic motor of claim 9,

the edges of two ends of the supporting frame (90) are respectively provided with a limiting step (96) extending along the length direction;

the first coil (50) is sleeved on the yoke portion (31) of the first stator iron core (30) and located between the limiting steps (96) of the two adjacent supporting frames (90).

11. The micro-ultrasonic motor of claim 1,

when the second magnet group (80) is over against the second stator core (40), the first stator core (30) is over against the middle position of two different magnetic poles in the first magnet group (70).

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