electric machine

Abstract

The application relates to a motor, which comprises an axle extending in an axial direction, a first rotor and a second rotor sleeved on the axle, and a stator located between the first rotor and the second rotor, wherein the stator comprises a first stator and a second stator connected to the outer periphery of the first stator; the first stator comprises two half stators arranged symmetrically to each other, the half stator comprises a first stator core in a fan shape and a first winding wound on the first stator core, the first stator core is provided with a plurality of arc protrusions protruding inward along the radial direction from the inner wall, the plurality of arc protrusions are uniformly arranged along the axial direction, the first winding comprises a plurality of groups of coils arranged along the axial direction, and each group of coils is wound on one of the plurality of arc protrusions. The structure of the two half stators simplifies the winding mode of the first winding and improves the assembly efficiency. The motor in the application comprises two groups of windings, realizes the linear motion and the rotary motion of the motor, and is free, flexible and changeable in control.

Description

Technical Field

[0001] This invention relates to the field of motor technology, and more particularly to a rotatable dual-rotor linear motor. Background Technology

[0002] Currently, the drive systems of electric tools such as electric hammers and electric picks require both a motor to provide rotational motion and a motor to provide linear motion.

[0003] In existing methods, a rotary motor is typically used, and a mechanical conversion device is set up to convert the rotary motion into linear motion. However, the setting of the mechanical conversion device increases the complexity of the whole system.

[0004] Therefore, it is indeed necessary to provide an improved motor to overcome the shortcomings of the prior art. Summary of the Invention

[0005] In view of the shortcomings of the prior art, the purpose of the present invention is to provide an electric motor that includes two rotors and can provide linear motion and rotational motion simultaneously.

[0006] The technical solution adopted by the present invention to solve the problems of the prior art is: an electric motor, including a rotating shaft extending along the axis, a first rotor and a second rotor sleeved on the rotating shaft, and a stator located between the first rotor and the second rotor. The stator includes a first stator and a second stator connected to the outer periphery of the first stator. The first stator includes two half-stators arranged symmetrically to each other. Each half-stator includes a fan-shaped first stator core and a first winding wound on the first stator core. The first stator core has several arc-shaped protrusions extending radially inward from the inner wall. The several arc-shaped protrusions are evenly arranged along the axis. The first winding includes several coils arranged along the axis. Each group of coils is wound on one of the several arc-shaped protrusions.

[0007] A further improvement is as follows: the first stator core is provided with an arc-shaped groove located between two adjacent arc-shaped protrusions, and the coil portion is accommodated in the arc-shaped groove.

[0008] A further improvement is as follows: the arc-shaped protrusion includes two symmetrically arranged ends, and the coil extends from two adjacent arc-shaped grooves and closes on the two ends.

[0009] A further improvement is as follows: The second stator includes a cylindrical second stator core and a second winding wound on the second stator core. The second stator core is provided with a circular yoke and several teeth extending radially outward from the yoke. The second winding is wound on the teeth.

[0010] A further improvement is as follows: the second rotor includes a cylindrical sleeve and several permanent magnets evenly distributed along the inner wall of the sleeve in the circumferential direction, with adjacent permanent magnets having opposite magnetization directions.

[0011] A further improvement is as follows: the sleeve is fitted around the outer periphery of the second stator, and the magnetic field generated by the second winding after it is energized interacts with the permanent magnet, thereby driving the second rotor to rotate around the shaft outside the second stator.

[0012] A further improvement is as follows: the yoke ring is provided with a through hole located at the center and extending axially, and the first stator passes through the through hole and is fixedly connected to the inner wall of the yoke ring.

[0013] A further improvement is that the two half-stators of the first stator together form an axially extending receiving portion, and the first rotor is located within the receiving portion.

[0014] A further improvement is as follows: the first rotor includes several magnetic rings sleeved on the rotating shaft, the magnetic rings being evenly arranged along the axial direction and the magnetization directions of adjacent magnetic rings being opposite.

[0015] A further improvement is that the magnetic field generated by the coil after it is energized interacts with the magnetic ring, thereby driving the first rotor to move linearly along the axial direction within the first stator.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The first stator includes two symmetrically arranged half-stators. Each half-stator includes a fan-shaped first stator core and a first winding wound on the first stator core. The first stator core has several arc-shaped protrusions extending radially inward from its inner wall, and these arc-shaped protrusions are evenly arranged axially. The first winding includes several coils arranged axially, with each coil wound on one of the arc-shaped protrusions. The structure of the two half-stators simplifies the winding method of the first winding and improves assembly efficiency. The motor in the present invention includes two sets of windings, realizing both linear and rotary motion of the motor, allowing for free and flexible control. Attached Figure Description

[0017] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings:

[0018] Figure 1 This is a schematic diagram of the structure of a motor according to a preferred embodiment of the present invention;

[0019] Figure 2 yes Figure 1 The diagram shown is an exploded view of the motor.

[0020] Figure 3 yes Figure 2 The diagram shows the structure of a half-stator of the motor.

[0021] Figure 4 yes Figure 3 A schematic diagram of the structure of the first stator core of the semi-stator shown;

[0022] Figure 5 yes Figure 2 The diagram shows the structure of the second stator in the motor.

[0023] Figure 6 yes Figure 2 The diagram shows the structure of the second rotor in the motor.

[0024] Meaning of the reference numerals in the diagram:

[0025] Motor 1, Shaft 10

[0026] First rotor 11, magnetic ring 110

[0027] Second rotor 12 sleeve 120

[0028] Permanent magnet 121, stator 13

[0029] First stator 14, housing part 140

[0030] Half-stator 141 First stator core 142

[0031] First winding 143, coil 144

[0032] End 145 arc-shaped protrusion 146

[0033] Arc-shaped groove 147 Second stator 15

[0034] Second stator core 150, second winding 151

[0035] Yoke ring 152 Through hole 153

[0036] Tooth 154 Detailed Implementation

[0037] The terminology used in this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. For example, terms such as "upper," "lower," "front," and "rear" that indicate orientation or positional relationship are based solely on the orientation or positional relationship shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device / element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention.

[0038] Please see Figures 1 to 5The diagram illustrates a preferred embodiment of the present invention, specifically a rotatable dual-rotor linear motor for use in power tools. The motor 1 includes an axially extending shaft 10, a first rotor 11 and a second rotor 12 mounted on the shaft 10, and a stator 13 located between the first rotor 11 and the second rotor 12. The stator includes a first stator 14 and a second stator 15 connected to each other. The motor 1 employs an external rotor structure, which fully utilizes this structural feature, separating the rotational motion from the linear motion, thus enhancing the freedom of control over the rotational and linear motions. Furthermore, the motor 1 also possesses advantages such as compact structure and high space utilization.

[0039] The first rotor 11 includes several magnetic rings 110 sleeved on the rotating shaft 10. The magnetic rings 110 are evenly arranged along the axial direction and the magnetization directions of adjacent magnetic rings 110 are opposite. The number of magnetic rings 110 can be set to ten, or to four, eight, twelve, or other multiples of two. The first rotor 11 has a simple structure and is easy to manufacture.

[0040] The second rotor 12 includes a cylindrical sleeve 120 and several permanent magnets 121 evenly distributed along the inner wall of the sleeve 120 in the circumferential direction. The permanent magnets 121 can be rectangular or tile-shaped. The magnetization directions of adjacent permanent magnets 121 are opposite. The number of permanent magnets 121 can be set to ten, or to four, eight, twelve, or other multiples of two. The number of permanent magnets 121 can be the same as or different from the number of magnetic rings 110.

[0041] The first stator 14 includes two symmetrically arranged half-stators 141. Each half-stator 141 has a fan-shaped first stator core 142 and a first winding 143 wound on the first stator core 142. The first stator core 142 has several arc-shaped protrusions 146 extending radially inward from its inner wall. These arc-shaped protrusions 146 are evenly arranged axially. The first winding 143 includes multiple coils 144, each coil 144 wound on one of the arc-shaped protrusions 146. The structural arrangement of the two half-stators 141 simplifies the winding method of the first winding 143 and improves assembly efficiency.

[0042] The first stator core 142 includes an arc-shaped groove 147 located between two adjacent arc-shaped protrusions 146, and the coil 144 is partially housed within the arc-shaped groove 147. Each arc-shaped protrusion 146 includes two symmetrically arranged ends 145, and the coil 144 extends from the two adjacent arc-shaped grooves 147 and closes onto the two ends 145. In actual production, the coil 144 can be formed first using a winding device and a mold, and then placed in the arc-shaped groove 147, thereby simplifying the production process and improving production efficiency.

[0043] The second stator 15 has a cylindrical second stator core 150 and a second winding 151 wound on the second stator core 150. The second stator core 150 includes a circular yoke 152 and several teeth 154 extending radially outward from the yoke 152. The second winding 151 is wound on the teeth 154. When energized, the second winding 151 can generate a magnetic field to control the operation of the motor 1. The yoke 152 has a through hole 153 located at the center and extending axially. The first stator 14 passes through the through hole 153 and is fixedly connected to the inner wall of the yoke 152. The connection between the first stator 14 and the second stator 15 is simple and makes the structure more compact.

[0044] The two half-stator 141 of the first stator 14 form an axially extending receiving portion 140, within which the first rotor 11 is located. The magnetic field generated by the energized coil 144 interacts with the magnetic ring 110, thereby driving the first rotor 11 to move linearly along the axial direction within the first stator 14. The sleeve 120 of the second rotor 12 is fitted onto the outer periphery of the second stator 15. The magnetic field generated by the energized second winding 151 interacts with the permanent magnet 121, thereby driving the second rotor 12 to rotate around the axis 10 outside the second stator 15.

[0045] By setting two different sets of windings, different motion modes of the first rotor 11 and the second rotor 12 are realized. These two motion modes are realized by two different sets of controls and do not interfere with each other. Thus, the motor 1 can provide a single motion mode or provide linear motion and rotational motion at the same time.

[0046] In this invention, the first stator 14 includes two symmetrical half-stators 141. Each half-stator 141 includes a fan-shaped first stator core 142 and a first winding 143 wound on the first stator core 142. The first stator core 142 has several arc-shaped protrusions 146 extending radially inward from its inner wall, and these protrusions are evenly arranged axially. The first winding 143 includes multiple coils 144, each coil 144 wound around one of the arc-shaped protrusions 146. The structure of the two half-stators 141 simplifies the winding method of the first winding 143 and improves assembly efficiency. The motor 1 in this invention includes two sets of windings, enabling the motor 1 to perform both linear and rotary motion, with free and flexible control.

[0047] This invention is not limited to the specific embodiments described above. Those skilled in the art will readily understand that many alternative solutions for the motor of this invention exist without departing from the principles and scope of the invention. The scope of protection of this invention is defined by the claims.

Claims

1. An electric motor, comprising an axially extending shaft, a first rotor and a second rotor sleeved on the shaft, and a stator located between the first rotor and the second rotor, the stator comprising a first stator and a second stator connected to the outer periphery of the first stator; characterized in that: The first stator includes two symmetrically arranged half-stators. Each half-stator includes a fan-shaped first stator core and a first winding wound on the first stator core. The first stator core has several arc-shaped protrusions extending radially inward from its inner wall. The arc-shaped protrusions are evenly arranged axially. The first winding includes several coils arranged axially. Each group of coils is wound on one of the arc-shaped protrusions.

2. The motor according to claim 1, characterized in that: The first stator core is provided with an arc-shaped groove located between two adjacent arc-shaped protrusions, and the coil portion is housed within the arc-shaped groove.

3. The motor according to claim 2, characterized in that: The arc-shaped protrusion includes two symmetrically arranged ends, and the coil extends from two adjacent arc-shaped grooves and closes on the two ends.

4. The motor according to claim 3, characterized in that: The second stator includes a cylindrical second stator core and a second winding wound on the second stator core. The second stator core has a circular yoke and several teeth extending radially outward from the yoke. The second winding is wound on the teeth.

5. The motor according to claim 4, characterized in that: The second rotor includes a cylindrical sleeve and several permanent magnets evenly distributed along the inner wall of the sleeve in the circumferential direction, with adjacent permanent magnets having opposite magnetization directions.

6. The motor according to claim 5, characterized in that: The sleeve is fitted around the outer periphery of the second stator. The magnetic field generated by the second winding after it is energized interacts with the permanent magnet, thereby driving the second rotor to rotate around the shaft outside the second stator.

7. The motor according to claim 4, characterized in that: The yoke ring has a through hole located at the center and extending axially, and the first stator passes through the through hole and is fixedly connected to the inner wall of the yoke ring.

8. The motor according to claim 1, characterized in that: The two half-stators of the first stator together form an axially extending receiving portion, within which the first rotor is located.

9. The motor according to claim 8, characterized in that: The first rotor includes several magnetic rings sleeved on the rotating shaft. The magnetic rings are evenly arranged along the axial direction and the magnetization directions of adjacent magnetic rings are opposite.

10. The motor according to claim 9, characterized in that: The magnetic field generated when the coil is energized interacts with the magnetic ring, thereby driving the first rotor to move linearly along the axial direction within the first stator.

Images