CN111404292A

CN111404292A - Compact structure miniature reciprocating rotation device

Info

Publication number: CN111404292A
Application number: CN202010303218.XA
Authority: CN
Inventors: 邱传松; 张振建; 刘�东
Original assignee: Chongqing Cangxingda Technology Co ltd
Current assignee: Chongqing Cangxingda Technology Co ltd
Priority date: 2020-04-17
Filing date: 2020-04-17
Publication date: 2020-07-10

Abstract

The invention discloses a compact miniature reciprocating rotation device, which comprises a machine shell, wherein a rotor and a stator are arranged in the machine shell, the stator comprises a stator core and a coil winding, the stator core comprises two side magnetic yokes oppositely arranged on the inner wall of the machine shell, an end magnetic yoke is connected between the same side edges of the two side magnetic yokes, first stator teeth are arranged on the inner wall of the end magnetic yoke, second stator teeth are arranged on the inner wall of the side magnetic yoke, the tooth height of the first stator teeth is greater than that of the second stator teeth, the coil winding is wound on the first stator teeth, rotor mounting spaces are formed on the inner sides of all the first stator teeth and the second stator teeth, and the rotor is mounted in the rotor mounting spaces. The size of the stator core is reduced, the purpose of reducing the size of the whole motor is achieved, and the requirement of a small motor in certain specific occasions is met.

Description

Compact structure miniature reciprocating rotation device

Technical Field

The invention relates to the technical field of motors, in particular to a miniature reciprocating rotation device with a compact structure.

Background

With the continuous development of society, people pay more and more attention to the quality of life, so that personal health care products and beauty health care products, such as electric toothbrushes, electric face cleaners, electric shavers and other related products are more and more popularized, and the products can not be driven by a reciprocating motion motor. These motors are typically small to fit in small spaces such as toothbrush handles. The traditional reciprocating motion motor is limited by the structural shapes of an inner stator and a rotor, the shape of the traditional reciprocating motion motor is generally circular, enough installation space needs to be reserved in the interior of a product, and the motor cannot meet the requirements of certain special products requiring more compact motor shapes, so that the structure of the inner stator or the rotor of the motor needs to be further improved.

Disclosure of Invention

In view of the above, the present invention provides a compact micro reciprocating rotary device.

The technical scheme is as follows: the utility model provides a compact structure's miniature reciprocating rotary device, includes the casing, is equipped with rotor and stator in this casing, the stator includes stator core and coil winding, and its key lies in: the stator iron core comprises two side magnet yokes, two end magnet yokes, a first stator tooth and a second stator tooth;

two the side yoke sets up relatively and fixed mounting is in on the inner wall of casing, two be connected with one between the homonymy side of side yoke the end yoke, be equipped with first stator tooth on the inner wall of end yoke, be equipped with second stator tooth on the inner wall of side yoke, the tooth height of first stator tooth is greater than the tooth height of second stator, the winding is equipped with on the first stator tooth coil winding, all first stator tooth and second stator tooth are the circumference form and distribute, and their inboard forms rotor installation space, installs in this rotor installation space the rotor.

By adopting the technical scheme, the first stator tooth with higher tooth height is wound with the coil winding which can generate a magnetic field, and the second stator tooth with lower tooth height is not wound with the coil winding or reduces the number of turns of the coil winding, so that the space interval between the side magnet yokes for mounting the second stator tooth can be effectively saved, the size of the stator core is reduced, the purpose of reducing the size of the whole motor is achieved, and the requirement of a small motor in certain specific occasions is met.

As further preferred:

the rotor comprises a rotating shaft which is rotatably installed in the rotor installation space, a rotor core is fixedly sleeved on the rotating shaft, a circle of magnetic rotor teeth are installed on the rotor core, the magnetic poles of the rotor teeth are opposite, the number of the rotor teeth is equal to the sum of the number of the first stator teeth and the number of the second stator teeth, the rotor teeth face to be adjacent to the gap between the first stator teeth and the second stator teeth, and the magnetic poles generated on one side, close to the rotor teeth, of the coil windings on the corresponding first stator teeth are the same. By adopting the structure, after the coil is electrified, the coil generates a magnetic field on the first stator tooth, and the magnetic field interacts with the magnetic field of the rotor tooth, so that the rotor is pushed to rotate, the current direction of the coil winding is changed in a reciprocating manner, and the circumferential reciprocating rotation of the rotor can be realized.

And a rotation limiting structure is arranged between the rotor and the stator and is used for limiting the reciprocating rotation amplitude of the rotor.

The stator core is coated with an insulating piece matched with the shape of the stator core;

the rotation limiting structure comprises at least two limiting protrusions, wherein the limiting protrusions are arranged on the insulating part corresponding to the first stator teeth and/or the second stator teeth and face towards gaps between the adjacent rotor teeth.

By adopting the structure, when the rotor rotates in a reciprocating way, the rotor is the limit rotating position when contacting the limit bulges at the two sides, thereby effectively avoiding the excessive rotation when misoperation or current signals are disordered.

The side magnetic yokes are planar, the end magnetic yokes are arc-shaped, and the circular center lines of the end magnetic yokes, the center lines of the two side magnetic yokes and the rotation center line of the rotor are superposed;

the cross section of the shell is waist-shaped, the two side magnetic yokes are fixedly arranged on the planar inner wall of the shell, and the two end magnetic yokes are fixedly arranged on the arc-shaped inner wall of the shell.

By adopting the structure, the first stator teeth with higher tooth height are arranged on the inner wall of the arc plate, and the part of the first stator teeth, which is higher than the second stator teeth, just occupies the bending space of the arc plate, so that the appearance structure is very compact, and the occupied space is smaller.

The first stator tooth comprises a first elongated tooth root and a first arc-shaped tooth top, wherein the first tooth top is fixedly mounted on the inner wall of the end-face magnetic yoke through the first tooth root, the center of a circular line of the first tooth top is coincided with the rotation center line of the rotor, and the first tooth root is wound with the coil winding. By adopting the structure, the coil winding is conveniently wound on the first tooth root part, and the space between the first tooth root part and the rotor can be reduced as much as possible after the rotor is installed on the first tooth top part, so that the volumes of the stator and the rotor are reduced, and further the volume of the whole motor is reduced.

The second stator teeth comprise circular arc-shaped second tooth tops which are fixedly arranged on the inner wall of the side magnetic yoke, and the centers of the circular center lines of the second tooth tops are coincided with the rotation center line of the rotor. By adopting the structure, the distance between the second tooth top and the rotor can be reduced as much as possible because the second tooth top is arc-shaped, thereby being beneficial to reducing the volume of the whole motor.

And the first tooth top part and the second tooth top part are respectively provided with a magnetic resistance groove, and the notch of each magnetic resistance groove faces to the rotor mounting space. By adopting the structure, if external force twists the rotor by a certain angle in a non-electrified state, the magnetic resistance slot can greatly reduce the magnetic field acting force between the magnetic block on the rotor and the stator teeth, so that the attraction between the magnetic block and the rotor teeth near the magnetic resistance slot is reduced, and the magnetic block can reach the position between the magnetic block and the adjacent two stator teeth under the balance of the acting force between the magnetic block and the adjacent two stator teeth, namely, the magnetic block is always kept at the initial position.

The insulation part is provided with one limiting protrusion corresponding to the first stator tooth and the second stator tooth respectively, one part of the limiting protrusion falls into the reluctance slot on the corresponding first stator tooth or the second stator tooth, and the other part of the limiting protrusion extends out of the reluctance slot and faces to the gap between the adjacent rotor teeth. By adopting the structure, the arrangement of the limiting bulge can not occupy redundant space in the motor, thereby being beneficial to reducing the total volume of the motor.

The inner wall of the end surface magnetic yoke is provided with the first stator tooth, the inner wall of the side surface magnetic yoke is provided with the second stator tooth, and the first stator tooth and the second stator tooth are alternately and uniformly distributed. By adopting the structure, the total number of the stator teeth is reasonably designed, and the two types of stator teeth are compactly and effectively distributed.

Compared with the prior art, the invention has the beneficial effects that: set up the stator tooth of two kinds of tooth height differences in the iron core to around establishing coil winding on the higher stator tooth of tooth height, then do not around establishing coil winding on the lower stator tooth of tooth height, can effectively save the installation space of two kinds of stator teeth like this, reduce stator core's volume, and then play the purpose that reduces whole motor volume, satisfy the demand of the small motor of some specific occasion.

Drawings

FIG. 1 is an exploded view of the present invention;

fig. 2 is a schematic plan view of a stator core;

fig. 3 is a schematic perspective view of a stator core;

FIG. 4 is a schematic view of a portion of the structure of the insulator;

fig. 5 is a schematic view of an operating state of the present invention.

Detailed Description

The present invention will be further described with reference to the following examples and the accompanying drawings.

As shown in fig. 1-4, a compact micro reciprocating rotation device includes a housing 1, a rotor and a stator are disposed in the housing 1, the stator includes a stator core 8 and a coil winding 6, the stator core 8 includes two side yokes 801, two end yokes 802, a first stator tooth 804 and a second stator tooth 803;

the two side magnetic yokes 801 are oppositely arranged and fixedly mounted on the inner wall of the machine shell 1, one end magnetic yoke 802 is connected between the side edges of the two side magnetic yokes 801 on the same side, first stator teeth 804 are arranged on the inner wall of the end magnetic yoke 802, second stator teeth 803 are arranged on the inner wall of the side magnetic yoke 801, the tooth height of the first stator teeth 804 is larger than that of the second stator teeth 803, the coil windings 6 are wound on the first stator teeth 804, all the first stator teeth 804 and the second stator teeth 803 are distributed in a circumferential manner, the inner sides of the first stator teeth 804 and the second stator teeth 803 form a rotor mounting space 805, and the rotor is mounted in the rotor mounting space 805.

The rotor includes a rotating shaft 5 rotatably installed in the rotor installation space 805, a cylindrical rotor core 4 is fixedly fitted on the rotating shaft 5, a circle of grooves are arranged on the rotor iron core 4, a rotor tooth 3 with magnetism is respectively arranged in the grooves, thus, one part of the rotor tooth 3 falls in the corresponding groove, the clearance between the rotor and the stator can be further reduced, so that the whole volume of the motor is reduced, the rotor teeth 3 are made of magnetic steel, the tooth top and the tooth root are respectively south pole and north pole, the magnetic poles at the tooth top of the adjacent rotor teeth 3 are opposite, the number of rotor teeth 3 is equal to the sum of the number of first stator teeth 804 and second stator teeth 803, the rotor teeth 3 face the gap between the adjacent first and

second stator teeth

804 and 803, the coil windings 6 generate the same magnetic poles on the corresponding first stator tooth 804 on the side close to the rotor tooth 3.

The first stator tooth 804 includes a first tooth root 804b and a first tooth top 804a, wherein the first tooth root 804b is long and the first tooth top 804a is arc-shaped, a side wall of one side of the first tooth root 804b is fixedly connected with an inner wall of the end yoke 802, the first tooth top 804a is fixedly mounted on a side wall of the other side of the first tooth root 804b, the center of a circular center line of the first tooth top 804a coincides with a rotation center line of the rotating shaft 5, and the first tooth root 804b is provided with the coil winding 6 in a winding manner.

The second stator teeth 803 include arc-shaped second tooth tops fixedly mounted on the inner wall of the side yoke 801, and centers of circle center lines of all the second tooth tops coincide with the rotation center line of the rotation shaft 5. In this embodiment, the center line of the first tooth top 804a and the center line of the second tooth top are both coincident with the rotation center line of the rotating shaft 5, but in some non-uniform air gap motor structure designs, the center lines of the first tooth top 804a and the second tooth top may be uniformly distributed with the rotation center line of the rotating shaft 5 as the center.

The first tooth top 804a and the second tooth top are respectively provided with a reluctance groove 806, the slot opening of the reluctance groove 806 faces the rotor mounting space 805, and the reluctance groove 806 is arc-shaped.

A rotation limiting structure is arranged between the rotor and the stator and used for limiting the reciprocating rotation amplitude of the rotor, specifically, an insulating member 7 matched with the shape of the stator core 8 is coated on the stator core 8, the insulating member 7 is formed by combining two symmetrical parts, the specific structure of the symmetrical parts is as shown in fig. 4, the two symmetrical parts respectively penetrate into the stator core 8 from two ends of the stator core and are coated on the two symmetrical parts, so that an insulating layer is formed on the surface of the stator core 8, and the coil winding 6 is wound on the insulating layer;

the rotation limiting structure comprises at least two limiting protrusions 10, the limiting protrusions 10 are arranged on the insulating member 7 corresponding to the first stator tooth 804 and/or the second stator tooth 803 and face to gaps between adjacent rotor teeth 3, in this embodiment, one limiting protrusion 10 is arranged on the insulating member 7 corresponding to the first stator tooth 804 and the second stator tooth 803 respectively, a part of the limiting protrusion 10 falls into a reluctance slot 806 on the corresponding first stator tooth 804 or the second stator tooth 803, the other part of the limiting protrusion extends out of the reluctance slot 806 and faces to gaps between adjacent rotor teeth 3, and a through hole 11 is arranged in the limiting protrusion 10 corresponding to the reluctance slot 806. Of course, if necessary, the limiting protrusion 10 may be provided only on the insulating member 7 corresponding to the two first stator teeth 804 or the second stator teeth 803.

In order to further reduce the size of the motor, the side magnetic yokes 801 are planar, the end magnetic yokes 802 are arc-shaped, and the circular center lines of the end magnetic yokes 802, the center lines of the two side magnetic yokes 801 and the rotation center line of the rotor are overlapped;

the cross section of the casing 1 is waist-shaped, the two side magnetic yokes 801 are fixedly arranged on the planar inner wall of the casing 1, and the two end magnetic yokes 802 are fixedly arranged on the arc-shaped inner wall of the casing 1.

The inner wall of the end surface magnetic yoke 802 is provided with a first stator tooth 804, the inner wall of the side surface magnetic yoke 801 is provided with a second stator tooth 803, and the first stator tooth 804 and the second stator tooth 803 are alternately and uniformly distributed.

As can be seen from the figure, two ends of the casing 1 are respectively provided with an end cover 9, a bearing 2 is installed in the end cover 9, the rotating shaft 5 is inserted in the bearing 2, and one end of the rotating shaft extends out of the casing 1 to form a power output end.

Of course, as an alternative structure of the present invention, the side yoke 1 and the end yoke 2 may be both flat plates, so that they are combined into a rectangular frame shape, and the matching casing may be made into a regular cubic row, which not only can reduce the volume of the motor, but also facilitates stacking and transportation.

As shown in fig. 5, after a forward current is applied to the coil winding 6, a north pole is generated on the top 804a of the corresponding first stator tooth 804, magnetic lines of the magnetic field can generate a south pole on the top of the second tooth of the adjacent second stator tooth 803, the rotating shaft 5 rotates counterclockwise under the interaction between the magnetic field of the rotor tooth 803 and the magnetic fields of the adjacent first stator tooth 804 and second stator tooth 803, and after the current direction is changed, the rotating shaft 5 rotates clockwise, and the reciprocating motion of the rotating shaft 5 can be realized by continuously changing the current.

Finally, it should be noted that the above-mentioned description is only a preferred embodiment of the present invention, and those skilled in the art can make various similar representations without departing from the spirit and scope of the present invention.

Claims

1. The utility model provides a compact structure's miniature reciprocating rotary device, includes casing (1), is equipped with rotor and stator in this casing (1), the stator includes stator core (8) and coil winding (6), its characterized in that: the stator iron core (8) comprises two side magnetic yokes (801), two end magnetic yokes (802), a first stator tooth (804) and a second stator tooth (803);

two side yoke (801) set up and fixed mounting relatively on the inner wall of casing (1), two be connected with one between the homonymy side of side yoke (801) end yoke (802), be equipped with first stator tooth (804) on the inner wall of end yoke (802), be equipped with second stator tooth (803) on the inner wall of side yoke (801), the tooth height of first stator tooth (804) is greater than the tooth height of second stator tooth (803), it is equipped with around on first stator tooth (804) coil winding (6), all first stator tooth (804) and second stator tooth (803) are the circumference form and distribute, and their inboard forms rotor installation space (805), install in this rotor installation space (805) the rotor.

2. The compact micro reciprocal rotating device of claim 1, wherein: the rotor comprises a rotating shaft (5) rotatably installed in the rotor installation space (805), a rotor core (4) is fixedly sleeved on the rotating shaft (5), a circle of magnetic rotor teeth (3) is installed on the rotor core (4), the magnetic poles of the rotor teeth (3) are opposite, the number of the rotor teeth (3) is equal to the sum of the number of the first stator teeth (804) and the number of the second stator teeth (803), the rotor teeth (3) face to be adjacent to gaps between the first stator teeth (804) and the second stator teeth (803), and the magnetic poles of the coil windings (6) generated on one side of the rotor teeth (3) on the corresponding first stator teeth (804) are the same.

3. The compact micro reciprocal rotation device of claim 1 or 2, wherein: and a rotation limiting structure is arranged between the rotor and the stator and is used for limiting the reciprocating rotation amplitude of the rotor.

4. The compact micro reciprocal rotating device of claim 3, wherein: the stator iron core (8) is coated with an insulating piece (7) matched with the shape of the stator iron core;

the rotation limiting structure comprises at least two limiting protrusions (10), wherein the limiting protrusions (10) are arranged on the insulating part (7) corresponding to the first stator teeth (4) and/or the second stator teeth (3) and face to the adjacent gaps between the rotor teeth (3).

5. The compact micro reciprocal rotating device of claim 1, wherein: the side magnetic yokes (801) are planar, the end magnetic yokes (802) are arc-shaped, and the circle center line of the end magnetic yokes (802), the center lines of the two side magnetic yokes (801) and the rotation center line of the rotor are overlapped;

the cross section of the machine shell (1) is waist-shaped, the two side magnetic yokes (801) are fixedly arranged on the planar inner wall of the machine shell (1), and the two end magnetic yokes (802) are fixedly arranged on the arc-shaped inner wall of the machine shell (1).

6. The compact micro reciprocal rotation device of claim 4, wherein: the first stator tooth (804) comprises a first elongated tooth root (804b) and a first arc-shaped tooth top (804a), wherein the first tooth top (804a) is fixedly mounted on the inner wall of the end face magnetic yoke (802) through the first tooth root (804b), the center of the circular line of the first tooth top (804a) coincides with the rotation center line of the rotor, and the coil winding (6) is wound on the first tooth root (804 b).

7. The compact micro reciprocal rotating device of claim 6, wherein: the second stator teeth (803) comprise circular arc-shaped second tooth tops which are fixedly arranged on the inner wall of the side magnetic yoke (801), and the centers of the circular center lines of all the second tooth tops are coincided with the rotation center line of the rotor.

8. The compact micro reciprocal rotary device of claim 7, wherein: the first tooth top part (804a) and the second tooth top part are respectively provided with a magnetic resistance groove (806), and the notch of the magnetic resistance groove (806) faces the rotor mounting space (805).

9. The compact micro reciprocal rotary device of claim 7, wherein: the insulation piece (7) is provided with one limiting protrusion (10) corresponding to the first stator tooth (804) and the second stator tooth (803), one part of the limiting protrusion (10) falls into the reluctance slot (806) on the corresponding first stator tooth (4) or the second stator tooth (3), and the other part of the limiting protrusion extends out of the reluctance slot (806) and faces to the gap between the adjacent rotor teeth (3).

10. The compact micro reciprocal rotary device of claim 7, wherein: the inner wall of the end face magnetic yoke (802) is provided with one first stator tooth (804), the inner wall of the side face magnetic yoke (801) is provided with one second stator tooth (803), and the first stator tooth (804) and the second stator tooth (803) are alternately and uniformly distributed.