Miniature synchronous motor with inner and outer magnetized rotor

Abstract

This invention provides a miniature synchronous motor with an internally and externally magnetized rotor, comprising a housing, a clamping plate, a coil assembly, and a rotor. The housing serves as a mounting carrier, and multiple first claw poles are arranged in a circular array within the housing. The clamping plate is installed within the housing, and multiple second claw poles are arranged in a circular array, with the second claw poles alternating with the first claw poles. The coil assembly is annular and installed outside the first and second claw poles. The rotor is rotatably mounted inside the first and second claw poles, and the rotor is internally and externally magnetized, with at least one pair of poles being unevenly magnetized. This miniature synchronous motor with an internally and externally magnetized rotor effectively solves the problem of starting dead zones, and offers high output torque, low manufacturing cost, and good performance.

Description

Technical Field

[0001] This utility model relates to an electric motor, and more particularly to a miniature synchronous motor with a rotor that is magnetized internally and externally. Background Technology

[0002] With the rapid development of microelectronic devices, the demand for efficient, precise, and miniaturized drive systems is increasing. Micro synchronous motors, due to their high efficiency and low power consumption, play a vital role in numerous applications, including consumer electronics, medical devices, and various small mechanical equipment. In recent years, in particular, the demand for small, high-efficiency motors has been continuously rising in fields such as smart wearable devices and medical monitoring instruments, making the research and development of micro synchronous motors a significant trend.

[0003] Although various design methods and manufacturing processes have been widely studied and applied in the existing micro synchronous motor technology, there are still some problems that need to be solved.

[0004] Most existing micro synchronous motors have dead points during startup, which is unacceptable in applications with high transmission requirements.

[0005] Currently, motors on the market that achieve similar functions are either too expensive, do not meet the required output torque, or are too large in size. Summary of the Invention

[0006] The technical problem to be solved by this utility model is to provide a miniature synchronous motor with an internal and external magnetized rotor that has a compact structure, low manufacturing cost, high torque and no dead angle during startup.

[0007] This utility model provides a miniature synchronous motor with a rotor having internal and external magnetization, comprising:

[0008] The housing 1 serves as an installation carrier, and the housing 1 is provided with a first claw pole 11, which is a plurality of first claw poles and is distributed in a ring array.

[0009] A clamping plate 4 is installed inside the housing 1. The clamping plate 4 is provided with a second claw pole 41. There are multiple second claw poles 41 arranged in a ring array, and the second claw poles 41 and the first claw pole 11 are alternately arranged.

[0010] The coil assembly 2 is ring-shaped and installed on the outside of the first claw pole 11 and the second claw pole 41;

[0011] The rotor 3 is rotatably mounted on the inner side of the first claw pole 11 and the second claw pole 41. The rotor 3 is magnetized both internally and externally, and at least one pair of poles is magnetized unevenly.

[0012] Furthermore, at least one pair of poles of the rotor 3 are offset and non-uniform magnetization is formed.

[0013] Furthermore, at least one pair of poles of the rotor 3 are radially offset.

[0014] Furthermore, the open end of the housing 1 is provided with a cover plate 6, and a gear assembly 5 connected to the rotor 3 is provided between the clamping plate 4 and the cover plate 6. The gear assembly 5 has an output shaft that extends to the outside of the housing 1 and serves as an output end.

[0015] Furthermore, the cover plate 6 and the clamping plate 4 are provided with shaft holes for mounting the shaft on the gear assembly 5.

[0016] Furthermore, both the first claw pole 11 and the second claw pole 41 are circumferentially distributed.

[0017] Furthermore, the first claw pole 11 and / or the second claw pole 41 are formed by stamping and bending.

[0018] Furthermore, the length directions of the first claw pole 11 and the second claw pole 41 are parallel to the axis of the rotor 3.

[0019] Furthermore, the coil assembly 2 includes an annular coil frame and wires wound on the coil frame. The inner wall of the coil frame is provided with positioning grooves or positioning protrusions corresponding to the first claw pole 11 and / or the second claw pole 41.

[0020] Furthermore, the distance between each of the first claw poles 11 and its adjacent second claw pole 41 is equal.

[0021] This invention relates to a miniature synchronous motor with an internally and externally magnetized rotor. The rotor features uneven internal and external magnetization, which achieves a highly efficient magnetic circuit while effectively avoiding dead spots during motor startup and operation. It boasts low manufacturing costs, high torque, and significantly improves motor operating efficiency and stability, ensuring smooth startup and continuous operation under various working conditions, extending service life, and delivering excellent performance. The claw poles are formed by stamping and bending, simplifying the manufacturing process, reducing costs, and enhancing mechanical strength, ensuring motor stability and durability. The uniform spacing between all claw poles ensures a uniform magnetic circuit distribution, reducing magnetic losses and improving overall motor efficiency. This miniature synchronous motor with an internally and externally magnetized rotor effectively solves the problem of startup dead spots, and offers high output torque, low manufacturing costs, and excellent performance. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of a miniature synchronous motor with an internally and externally magnetized rotor according to the present invention.

[0023] Figure 2 This is a schematic diagram of the micro synchronous motor with an internally and externally magnetized rotor according to this utility model from another angle.

[0024] Figure 3 This is a cross-sectional view of the miniature synchronous motor with an internally and externally magnetized rotor according to the present invention.

[0025] Figure 4 This is another planar sectional view of the miniature synchronous motor with an internally and externally magnetized rotor according to the present invention;

[0026] Figure 5 This is a cross-sectional view of the miniature synchronous motor with an internally and externally magnetized rotor according to the present invention.

[0027] Figure 6 This is an exploded structural diagram of the micro synchronous motor with an internally and externally magnetized rotor according to the present invention.

[0028] Figure 7 This is a schematic diagram of the rotor structure of the micro synchronous motor with internal and external magnetization of the present invention.

[0029] Figure 8 This is a schematic diagram of the housing of the micro synchronous motor with an internally and externally magnetized rotor according to the present invention.

[0030] Figure 9 This is a cross-sectional view of the housing of the miniature synchronous motor with an internally and externally magnetized rotor according to the present invention.

[0031] Figure 10 This is a schematic diagram of the clamping plate of the micro synchronous motor with an internally and externally magnetized rotor according to the present invention.

[0032] Figure 11 This is a cross-sectional view of the miniature synchronous motor with an internally and externally magnetized rotor according to the present invention.

[0033] Figure 12 This is a schematic diagram of the rotor magnetic field of the micro synchronous motor with an internally and externally magnetized rotor according to the present invention. Detailed Implementation

[0034] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0035] See Figures 1-12 This utility model provides a miniature synchronous motor with a rotor that is magnetized internally and externally, including a housing 1, a clamping plate 4, a coil assembly 2 and a rotor 3.

[0036] The housing 1 serves as the mounting carrier. The housing 1 is a cylindrical structure with one open end, forming a mounting cavity. The clamping plate 4, coil assembly 2, and rotor 3 are installed in the mounting cavity. The housing 1 is provided with a first claw pole 11. There are multiple first claw poles 11 arranged in a ring array. In this embodiment, the first claw poles 11 are located on the bottom surface of the housing 1, that is, on the bottom surface of the mounting cavity. The multiple first claw poles 11 are evenly distributed around the axis of the housing 1 and are arranged upward, that is, towards the open end of the housing 1.

[0037] The clamping plate 4 is installed inside the housing 1. The clamping plate 4 is a plate-shaped structure, and its plane is perpendicular to the axis of the housing 1. The clamping plate 4 is provided with second claw poles 41. The number of second claw poles 41 is the same as that of first claw poles 11, and they are arranged in a ring array. The second claw poles 41 and the first claw poles 11 are alternately arranged. In this embodiment, multiple second claw poles 41 are evenly distributed on the clamping plate 4, facing downwards, and multiple second claw poles 41 are evenly distributed around the axis of the housing 1.

[0038] The inner and outer walls of the first claw pole 11 and the second claw pole 41 are arc-shaped surfaces, forming a ring-shaped claw pole structure, which divides the mounting cavity into a circular inner mounting cavity and a ring-shaped outer mounting cavity.

[0039] The coil assembly 2 is ring-shaped, specifically circular, and is installed on the outside of the first claw pole 11 and the second claw pole 41, that is, inside the outer mounting cavity. The first claw pole 11 and the second claw pole 41 are located on the inside of the coil assembly 2. This coil assembly is used to generate a sinusoidal magnetic field, thereby driving the rotor 3 to rotate.

[0040] The rotor 3 is rotatably mounted inside the first claw pole 11 and the second claw pole 41, that is, rotatably mounted in the inner mounting cavity. It is coaxial with the housing 1. The side wall of the rotor 3 is provided with permanent magnets. In this application, the rotor 3 is magnetized inside and outside, and at least one pair of poles is magnetized unevenly.

[0041] Internal and external magnetization refers to the radial magnetization technology used in the ring permanent magnet of the permanent magnet claw pole motor, so that the inner and outer rings of the magnetic ring have different magnetic poles (N pole and S pole), which can realize the high-efficiency magnetic circuit of the claw pole motor.

[0042] In this application, the rotor is magnetized unevenly inside and outside. This method achieves a high-efficiency magnetic circuit while effectively avoiding dead spots during motor startup and operation. It has low manufacturing cost, high torque, and significantly improves the operating efficiency and stability of the motor. It ensures smooth startup and continuous operation under various working conditions, extends service life, and has good performance.

[0043] Specifically, at least one pair of inner and outer poles of rotor 3 are offset, resulting in uneven magnetization. In this application, at least one pair of poles of rotor 3 are radially offset, meaning they form an offset at a certain angle to the radial direction of rotor 3. (See reference...) Figure 12 .

[0044] In this application, the first claw pole 11 and the second claw pole 41 are formed by stamping and bending. Specifically, U-shaped slots are stamped on the bottom surface of the housing 1 or the clamping plate 4 to form a sheet. The sheet is bent to form a claw pole structure. This structure not only simplifies the manufacturing process and reduces the manufacturing cost, but also enhances the mechanical strength of the claw pole and ensures the stability and durability of the motor.

[0045] The length directions of the first claw pole 11 and the second claw pole 41 are parallel to the axis of the rotor 3, ensuring smooth magnetic circuit, increasing magnetic flux density, and further optimizing motor performance.

[0046] In this application, there are four first claw poles 11 and four second claw poles 41, which are evenly distributed circumferentially and alternately arranged with gaps; the rotor 3 is provided with eight pairs of magnetic poles, at least one pair of which is unevenly magnetized.

[0047] A cover plate 6 is provided at the open end of the housing 1. A gear assembly 5 is provided between the clamping plate 4 and the cover plate 6. The gear assembly 5 includes multiple meshing gears. The input end of the gear assembly 5 is connected to the gear on the rotor 3, serving as the power input end of the gear assembly 5. An output shaft 61 is provided on the gear assembly 5. The output shaft 61 extends outside the housing 1 (cover plate 6) and serves as the output end of the entire motor. For ease of assembly, in this embodiment, the output shaft 61 is rotatably mounted on the cover body through a bearing (or bushing) and connected to the output end of the gear assembly 5. Shaft holes 42 for mounting the shaft on the gear assembly 5 are provided on the cover plate 6 and the clamping plate 4. The shaft is formed by stamping, which is convenient to manufacture and has low cost.

[0048] The coil assembly 2 is used to generate a sinusoidal magnetic field to drive the rotor 3 to rotate. The coil assembly 2 includes an annular coil frame and wires wound on the coil frame. The inner wall of the coil frame is provided with one or more positioning grooves or positioning protrusions, which correspond to the first claw pole 11 and / or the second claw pole 41 to achieve positioning. This positioning can realize the installation positioning of the coil assembly 2 and the installation positioning of the clamping plate 4, realize fast and accurate assembly, and ensure the positional accuracy of each claw pole. In this application, the clamping plate is attached to the top surface of the coil frame.

[0049] In this application, the distance between each first claw pole 11 and its adjacent second claw pole 41 is equal, that is, all claw poles are equally spaced, which ensures that the magnetic circuit is evenly distributed, reduces magnetic loss, and improves the overall efficiency of the motor.

[0050] This invention relates to a miniature synchronous motor with an internally and externally magnetized rotor. The rotor features uneven internal and external magnetization, which achieves a highly efficient magnetic circuit while effectively avoiding dead spots during motor startup and operation. It boasts low manufacturing costs, high torque, and significantly improves motor operating efficiency and stability, ensuring smooth startup and continuous operation under various working conditions, extending service life, and delivering excellent performance. The claw poles are formed by stamping and bending, simplifying the manufacturing process, reducing costs, and enhancing mechanical strength, ensuring motor stability and durability. The uniform spacing between all claw poles ensures a uniform magnetic circuit distribution, reducing magnetic losses and improving overall motor efficiency. This miniature synchronous motor with an internally and externally magnetized rotor effectively solves the problem of startup dead spots, and offers high output torque, low manufacturing costs, and excellent performance.

[0051] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A micro-synchronous motor with an internal-external magnetization rotor, characterized in that, include: The housing serves as an installation carrier, and the housing contains a plurality of first claw poles arranged in a circular array. A clamping plate is installed inside the housing. The clamping plate is provided with a second claw pole. There are multiple second claw poles arranged in a circular array, and the second claw poles are alternately arranged with the first claw poles. The coil assembly is ring-shaped and mounted on the outside of the first claw pole and the second claw pole; The rotor is rotatably mounted inside the first and second claw poles, and the rotor is magnetized both internally and externally, with at least one pair of poles being magnetized unevenly.

2. The micro-synchronous machine with a rotor of the internal-external magnetization type according to claim 1, characterized in that: At least one pair of poles of the rotor are offset, resulting in uneven magnetization.

3. The micro-synchronous machine with a rotor of the internal-external magnetization type according to claim 2, characterized in that: At least one pair of pole radial offsets of the rotor.

4. The miniature synchronous motor with an internally and externally magnetized rotor as described in claim 1, characterized in that: The open end of the housing is provided with a cover plate, and a gear assembly connected to the rotor is provided between the clamping plate and the cover plate. The gear assembly has an output shaft that extends outside the housing and serves as an output end.

5. The microsynchronous machine with a rotor of the internal-external magnetization type according to claim 4, characterized in that: The cover plate and the clamp plate are provided with shaft holes for mounting the shaft on the gear assembly.

6. The micro-synchronous machine with a rotor of the internal-external magnetization type according to claim 1, characterized in that: Both the first claw pole and the second claw pole are evenly distributed circumferentially.

7. The micro-synchronous machine with a rotor of the internal-external magnetization type according to claim 1, characterized in that: The first claw pole and / or the second claw pole are formed by stamping and bending.

8. The micro-synchronous machine with a rotor of the internal-external magnetization type according to claim 1, characterized in that: The length directions of the first claw pole and the second claw pole are parallel to the axis of the rotor.

9. The miniature synchronous motor with an internally and externally magnetized rotor as described in claim 1, characterized in that: The coil assembly includes an annular coil frame and wires wound on the coil frame. The inner wall of the coil frame is provided with positioning grooves or positioning protrusions corresponding to the first claw pole and / or the second claw pole.

10. The micro-synchronous machine with a rotor of the internal-external magnetization type according to claim 1, characterized in that: The distance between the first claw pole and its adjacent second claw pole is equal.

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