motor

Abstract

A motor is provided to solve the problem of small space inside the motor and difficult configuration of circuit. The motor comprises a stator with three coil windings to surround an axis of the motor at intervals, and a rotor with a ring-shaped magnet and a rotating shaft through the center of the ring-shaped magnet, the ring-shaped magnet has a number of magnetic poles which is a multiple of four and at least eight, the rotating shaft is rotatably combined with the stator along the axis, the three coil windings are located in axial sections opposite to the magnetic poles of the ring-shaped magnet, and each coil winding has a gap with the ring-shaped magnet, and a center point of each coil winding is located in the area from the middle circle line between the inner edge and the outer edge of the ring-shaped magnet to the outer edge. In this way, the effects of increasing the internal configuration space of the motor, improving the rotation efficiency and stability can be achieved.

Description

Technical Field

[0001] This utility model relates to a motor, and more particularly to a motor that increases the internal configuration space and improves rotational efficiency. Background Technology

[0002] The magnetic flux passing through the air gap between the stator and rotor of the existing axial motor is parallel to the rotation axis. The stator winding of the axial motor can be directly integrated on the printed circuit board. Compared with the equivalent radial flux motor, it can produce a flat and wide structure, which is suitable for making small and lightweight micro motors.

[0003] The existing motors lack space between the stator windings for the placement of circuits or other components, which increases the difficulty of motor manufacturing. Furthermore, the torque and rotation efficiency of existing motors are affected by the interaction between the magnetic flux generated by the stator windings and the rotor magnetic poles. Therefore, the placement of the stator windings and the distribution of the rotor magnetic poles determine the motor's efficiency, stability, and can even cause problems such as the motor failing to start.

[0004] Therefore, there is indeed a need to improve the existing motors. Utility Model Content

[0005] To address the aforementioned problems, the purpose of this invention is to provide a motor that can increase the internal configuration space of the motor.

[0006] A secondary objective of this invention is to provide a motor that can avoid dead zones during motor startup.

[0007] Another objective of this invention is to provide a motor that can improve motor torque and output efficiency.

[0008] Another objective of this invention is to provide a motor that reduces assembly difficulty.

[0009] The directional properties or similar terms used throughout this utility model, such as "axial direction," "inner," and "outer," are mainly based on the directions in the accompanying drawings. These directional properties or similar terms are only used to assist in explaining and understanding the various embodiments of this utility model and are not intended to limit this utility model.

[0010] The use of the quantifiers “a” or “an” for the elements and components described throughout this utility model is merely for convenience and to provide the general meaning of the scope of this utility model; in this utility model, it should be interpreted as including one or at least one, and a single concept also includes multiple cases, unless it clearly means otherwise.

[0011] The motor of this invention includes: a stator having three coil windings spaced apart around a central axis of the motor, each coil winding being wound along a plane of rotation of the central axis; and a rotor having an annular magnet and a rotating shaft passing through the center of the annular magnet, the annular magnet having at least eight magnetic poles that are multiples of four, the rotating shaft being rotatably coupled to the stator along the central axis, the three coil windings being axially aligned with the magnetic poles of the annular magnet, and each coil winding having an air gap with the annular magnet, the center point of each coil winding being located in the region from the midpoint of the annular magnet's inner edge to the outer edge.

[0012] Therefore, the motor of this invention, driven by three-phase coil windings and 4N magnetic poles, can be smoothly started to rotate. Furthermore, the space left by the spaced arrangement of the three coil windings can be used to install circuits or other components, thereby reducing the motor's size and assembly difficulty. In addition, the three coil windings are positioned at the location of the annular magnet, allowing the magnetic flux generated by each coil to highly overlap with the magnetic field lines of the annular magnet, which can improve the motor's torque and output efficiency.

[0013] The ring magnet has eight poles. This allows for the construction of a three-slot, eight-pole motor, which improves torque and avoids starting dead zones.

[0014] The thickness of this motor is 2 mm to 8 mm. Thus, the axial air gap structure reduces the motor's thickness, achieving a thinner motor design.

[0015] In this configuration, the winding boundary of each coil winding, away from the axis, extends beyond the outer edge of the annular magnet. This allows the center of high magnetic flux density in each coil winding to be located at the point of magnetic field concentration, thus increasing the motor's power output.

[0016] In this configuration, the winding boundary of each coil winding near the axis is relatively far from the axis relative to the inner edge of the annular magnet. This allows the magnetic flux of each coil winding to pass through the magnetic lines of force of the magnetic poles, thus increasing the motor's power output.

[0017] In this design, each coil winding has a winding angle with the axis as its center on the plane of rotation, and this winding angle is between 30 degrees and 90 degrees. In this way, each coil winding can generate the magnetic flux to drive rotation, while limiting the space occupied by the coil, which has the effect of increasing the internal configuration space of the motor.

[0018] The winding angle is the angle between the two boundary points of each coil winding that are furthest apart in the direction of motor rotation and the line connecting them to the axis. This limits the space occupied by each coil winding, thus increasing the internal configuration space of the motor.

[0019] Each coil winding is integrated with a base plate. The winding angle is the angle between the line connecting the two furthest points of each base plate in the direction of motor rotation and the axis. This limits the space occupied by each base plate, increasing installation space and reducing assembly difficulty.

[0020] The winding shape of each coil can be elliptical, circular, fan-shaped, or trapezoidal. This allows for the selection of a suitable coil winding shape based on motor assembly requirements or magnetic flux distribution, simplifying installation and improving rotational stability. Attached Figure Description

[0021] Figure 1 : An exploded perspective view of a preferred embodiment of the present invention; Figure 2 :along Figure 1 AA-line cross-section; Figure 3 :along Figure 2 A top perspective view of the BB line; Figure 4 :like Figure 3 The image shown is a partial enlarged view of another embodiment of the present invention; Figure 5 :like Figure 3 The image shown is a partial enlarged view of another embodiment of the present invention; Figure 6 :like Figure 3 The image shown is a partial enlarged view of another embodiment of the present invention.

[0022] Explanation of reference numerals in the attached figures: 1: Stator 11: Coil winding 12: Base Plate 13: Circuit Board 2: Rotor 21: Ring magnet 21a: Inner edge 21b: Outer edge 21c: Mid-section loop 22: Rotation axis M: Motor C: Axis P: Center point θ: Angle of winding S: Boundary point. Detailed Implementation

[0023] To make the above and other objects, features and advantages of this utility model more apparent and understandable, preferred embodiments of this utility model are described below in detail with reference to the accompanying drawings; in addition, those symbols that are marked with the same symbols in different drawings are considered to be the same and their descriptions will be omitted.

[0024] Please refer to Figure 1 and Figure 2 As shown, it is a preferred embodiment of the motor of the present invention, including a stator 1 and a rotor 2, the rotor 2 being rotatably coupled to the stator 1 to form a motor M.

[0025] The stator 1 is a three-phase electromagnetic field composed of three coil windings 11. The three coil windings 11 are preferably arranged at equal intervals around a shaft C of the motor M. Each coil winding 11 is wound along the rotation plane of the shaft C, so that the magnetic flux generated by each coil winding 11 is parallel to the shaft C. Furthermore, each coil winding 11 can also be connected to a base plate 12 and electrically connected to a circuit board 13 to provide current through each coil winding 11 and control the phase switching of each coil winding 11, so that the phase difference between the three coil windings 11 is 120 degrees.

[0026] The rotor 2 has a ring magnet 21 and a rotating shaft 22 passing through the center of the ring magnet 21. The magnetic poles of the ring magnet 21 are arranged in a ring-shaped arrangement with opposite poles, that is, the south and north poles alternate around the rotating shaft 22. The number of magnetic poles is preferably a multiple of four and at least eight. In this embodiment, the ring magnet 21 has eight magnetic poles, but the present invention is not limited thereto. Alternatively, the ring magnet 21 can be a one-piece ring-shaped sheet, which generates several magnetic poles with different magnetization directions by magnetization. Figure 1 The boundaries between adjacent magnetic poles shown are merely virtual auxiliary lines.

[0027] The rotor 2 is rotatably connected to the stator 1 via the rotating shaft 22, such that the center of the annular magnet 21 and the rotating shaft 22 are located at the axis C of the motor M. The three coil windings 11 are axially aligned with the magnetic poles of the annular magnet 21, and an air gap is maintained between each coil winding 11 and the annular magnet 21, so that the motor M forms an axial air gap induction motor. Compared with the equivalent radial air gap motor, it can achieve thinness and lightness. The thickness of the motor M can be 2 mm to 8 mm.

[0028] Please refer to Figure 3As shown, a center point P of each coil winding 11 is located within the range of the annular magnet 21, and the center point P is preferably located in the region from the midpoint loop line 21c between the inner edge 21a and the outer edge 21b of the annular magnet 21 to the outer edge 21b, wherein the midpoint loop line 21c is a virtual auxiliary line; furthermore, the winding boundary of each coil winding 11 away from the axis C can extend beyond the outer edge 21b, that is, part of the structure of each coil winding 11 can extend outward beyond the range of the annular magnet 21; and the winding boundary of each coil winding 11 near the axis C is farther from the axis than the inner edge 21a, that is, the inner part of each coil winding 11 near the axis C is still within the range of the annular magnet 21.

[0029] Furthermore, each coil winding 11 has a winding angle θ with respect to the axis C on the plane of rotation. This winding angle θ can be between 30 degrees and 90 degrees, and is preferably 45 degrees, 60 degrees, or 75 degrees. In this embodiment, the winding angle θ is the angle between the two boundary points S of each coil winding 11 that are furthest apart in the direction of rotation of the motor M and the lines connecting them to the axis C. However, the winding angle θ can also be the angle between the two points of each base plate 12 that are furthest apart in the direction of rotation of the motor M and the lines connecting them to the axis C. This invention is not limited to this.

[0030] In this embodiment, the winding shape of each coil winding 11 is elliptical; however, this invention is not limited thereto, please refer to [further details]. Figures 4-6 As shown, these are other embodiments of each coil winding 11. The winding shape of each coil winding 11 can also be circular, fan-shaped, or trapezoidal.

[0031] The motor M of this invention may also include a control unit (not shown), which can be electrically connected to the circuit board 13 to detect the back electromotive force change of each coil winding 11, calculate the angle of the rotor 2, and thus switch the current through each coil winding 11 to drive the motor M to operate continuously and stably. In this way, the motor M does not need to install a Hall sensor to detect the position of the rotor 2, and the motor M can become a sensorless three-phase drive motor, which simplifies installation and increases the internal space of the motor M.

[0032] In summary, the motor of this invention, driven by a three-phase coil winding and 4N magnetic poles, can be smoothly started to rotate. Furthermore, the space left by the spaced arrangement of the three coil windings can be used to install circuits or other components, thereby reducing the motor's size and assembly difficulty. Additionally, the three coil windings are positioned at the location of the annular magnet, allowing the magnetic flux generated by each coil to highly overlap with the magnetic field lines of the annular magnet, which can improve the motor's torque and output efficiency.

Claims

1. A motor, characterized in that, include: A stator having three coil windings spaced apart around a shaft of the motor, each coil winding being wound along a plane of rotation of the shaft; and A rotor having a ring magnet and a rotating shaft passing through the center of the ring magnet, the ring magnet having at least eight magnetic poles that are multiples of four, the rotating shaft being rotatably coupled to the stator along the axis, three coil windings having axial portions opposite the magnetic poles of the ring magnet, and each coil winding having an air gap with the ring magnet, and a center point of each coil winding being located in the region from the midpoint of the inner and outer edges of the ring magnet to the outer edge.

2. The motor as described in claim 1, characterized in that, The ring magnet has eight magnetic poles.

3. The motor as described in claim 1, characterized in that, The thickness of the motor is 2 mm to 8 mm.

4. The motor as described in claim 1, characterized in that, The winding boundary of each coil winding, away from the axis, extends beyond the outer edge of the annular magnet.

5. The motor as described in claim 1, characterized in that, The winding boundary of each coil winding near the axis is relatively far from the axis relative to the inner edge of the annular magnet.

6. The motor as claimed in claim 1, characterized in that, Each coil winding has a winding angle with the axis as the center on the plane of rotation of the axis. This winding angle is between 30 degrees and 90 degrees.

7. The motor as described in claim 6, characterized in that, The winding angle is the angle between the two boundary points of each coil winding that are furthest apart in the direction of rotation of the motor and the line connecting them to the axis.

8. The motor as described in claim 6, characterized in that, Each coil winding is connected to a base plate, and the winding angle is the angle between the line connecting the two points of the base plate that are furthest apart in the direction of motor rotation and the axis.

9. The motor as claimed in claim 1, characterized in that, The winding shape of each coil winding is elliptical, circular, fan-shaped, or trapezoidal.

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