TWI662780B - Easy-to-start slim motor - Google Patents

Abstract

The utility model relates to a thin motor which is easy to start and is used for solving the problems of poor universality of the conventional thin motor which is easy to start. The easy-to-start thin motor of the present invention includes: a base, the base is provided with a shaft tube; a stator, the stator is combined with the base; a rotor, the rotor is rotatably connected to the shaft tube, and the rotor has A magnetic element; and a magnetic suction ring, the magnetic suction ring has a ring body and two positioning portions, the two positioning portions are radially oppositely connected to the ring body, and the ring body is sleeved on the outer periphery of the shaft tube, The annular body is axially offset from the magnetic element, and the two positioning portions are axially opposed to the magnetic element, respectively.

Description

Easy-to-start slim motor

The present invention relates to a motor, particularly a thin motor that is easy to start.

Generally speaking, conventional motors generally include a base, a rotor, and a stator; the base is provided with a shaft tube for the rotor to be rotatably combined, and the stator is coupled to the base. Thereby, after the stator is energized to generate a magnetic field, it can be used to drive the rotor to rotate. However, when the conventional motor is used in practice, there are still problems such as difficulty in starting or dead point of starting. For this reason, the current common motors are provided with related structural designs that are "easy to start".

Please refer to FIG. 1, which is a conventional easy-to-start motor 9. The easy-to-start motor 9 has a base 91, a rotor 92, and a stator 93. The base 91 has an inner surface 911 and an outer surface 912 opposite to each other. The base 91 is provided with a shaft tube 913 on the inner surface 911. The rotor 92 has a hub 921 rotatably disposed on the shaft tube 913, and the rotor 92 further has a magnet ring 922 coupled to the hub 921 and facing the inner surface 911 of the base 91. The stator 93 includes a circuit substrate 931, induction coils 932, and a positioning member 933. The circuit substrate 931 is assembled between the inner surface 911 of the base 91 and the hub 921. The induction coils 932 are disposed on the The circuit board 931 is opposite to the magnet ring 922, and the positioning member 933 is disposed on the outer surface 912 of the base 91. When the rotor 92 is about to stop rotating, the positioning member 933 magnetically attracts the magnet ring 922 to ensure that The rotor 92 can be stopped in a position where it is easy to start. An embodiment similar to the conventional easy-to-start motor 9 has been disclosed in the ROC Patent No. I483515 "thin motor" patent case.

However, since the positioning member 933 of the conventional easy-to-start motor 9 is long and needs to pass the positioning member 933 through the rotation axis of the hub 921, the positioning member 933 can only be provided on the base. 91 on the outer surface 912, otherwise the positioning member 933 will cause structural interference with the shaft tube 913. However, if the positioning member 933 is disposed on the outer surface 912 of the base 91, the positioning member 933 is far away from the magnet ring 922, so that the magnetic attraction effect between the magnet ring 922 and the positioning member 933 is weak. .

In addition, there is a conventional motor. The induction coil of the stator is axially wound on the outer periphery of the shaft tube of the base. Therefore, this type of conventional motor requires a metal shaft tube to be magnetically permeable, and The shaft tube is combined by a circumferential surface of the shaft tube into a through hole penetrating the base. In this way, no matter where the elongated positioning member is provided on the base, as long as the positioning member is passed through the rotation axis of the hub, the positioning member will contact the metal shaft tube, and magnetic leakage will occur. Phenomenon, and there will be structural interference with the shaft tube, so the conventional motor of this type cannot apply the above-mentioned technology of the motor 9 that is easy to start.

In view of this, the conventional easy-to-start motor does still need to be improved.

In order to solve the above problems, the present invention provides a thin motor that is easy to start. The magnetic ring used to magnetically attract magnetic components has good versatility, regardless of whether it is disposed on the outer surface, the inner surface, or the outer surface of the base. Between the surfaces and other places, there will be no structural interference with the shaft tube or magnetic leakage, so it can be applied to different types of thin motors.

The invention provides a thin motor that is easy to start. The magnetic ring can be quickly installed near the magnetic element to improve the magnetic attraction effect between the magnetic element and the magnetic ring.

The directionality of the present invention described below or its approximate terms, such as "upper (top)", "lower (bottom)", "inside", "outside", "side", etc., are mainly referred to the directions of the attached drawings. The directional or similar terms are only used to help explain and understand the embodiments of the present invention, not to limit the present invention. Bright.

The easy-to-start thin motor of the present invention includes: a base, the base is provided with a shaft tube; a stator, the stator is combined with the base; a rotor, the rotor is rotatably connected to the shaft tube, and the rotor It has a magnetic element and a magnetic suction ring. The magnetic suction ring has a ring body and two positioning parts. The two positioning parts are radially oppositely connected to the ring body. The ring body is sleeved on the outer periphery of the shaft tube. The ring body is axially offset from the magnetic element, the two positioning portions are axially opposite to the magnetic element, the base has an inner surface and an outer surface opposite to each other, and the magnetic attraction ring is not exposed in the inner portion. Surface and the outer surface.

According to this, the thin motor of the present invention which is easy to start, the magnetic ring used for magnetic attraction with the magnetic element has good versatility, whether it is disposed on the outer surface, the inner surface, or between the outer surface and the inner surface of the base, etc. It will not cause structural interference with the shaft tube or cause magnetic leakage, so it can be applied to different types of thin motors with good practicability. In particular, the magnetic ring can be quickly installed adjacent to the magnetic element to enhance the magnetic attraction effect between the magnetic element and the magnetic ring.

Wherein, the base covers the magnetic ring by a plastic injection molding method. In this way, the magnetic ring can be stably fixed at a predetermined position in the base, and the steps of assembling and fixing the magnetic ring can also be omitted when assembling the thin motor, thereby improving the convenience and efficiency of assembly.

The easy-to-start thin motor of the present invention includes: a base, the base is provided with a shaft tube; a stator, the stator is combined with the base; a rotor, the rotor is rotatably connected to the shaft tube, and the rotor It has a magnetic element and a magnetic suction ring. The magnetic suction ring has a ring body and two positioning parts. The two positioning parts are radially oppositely connected to the ring body. The ring body is sleeved on the outer periphery of the shaft tube. The ring body is axially offset from the magnetic element, the two positioning portions are axially opposite to the magnetic element, and the base is provided with an anti-rotation portion, and at least one of the two positioning portions is subject to the anti-rotation portion. Limit. In this way, the magnetic suction ring can be quickly installed and positioned, and the magnetic suction ring cannot be rotated on the base after the installation and positioning, thereby improving the positioning effect of the magnetic suction ring and the like.

The maximum outer diameter of the ring body is smaller than the inner diameter of the magnetic element. The positioning portion extends outward from an outer peripheral edge of the annular body. In this way, the operation convenience of assembling the magnetic ring can be improved.

The easy-to-start thin motor of the present invention includes: a base, the base is provided with a shaft tube; a stator, the stator is combined with the base; a rotor, the rotor is rotatably connected to the shaft tube, and the rotor It has a magnetic element and a magnetic suction ring. The magnetic suction ring has a ring body and two positioning parts. The two positioning parts are radially oppositely connected to the ring body. The ring body is sleeved on the outer periphery of the shaft tube. The ring body is axially offset from the magnetic element, the two positioning portions are axially opposite to the magnetic element, the minimum inner diameter of the ring body is greater than the outer diameter of the magnetic element, and the two positioning portions are formed by the ring body The inner perimeter extends inward. In this way, the operation convenience of assembling the magnetic ring can be improved.

Wherein, the magnetic ring is 0.2 to 1 mm away from the magnetic element. In this way, it is ensured that a good magnetic attraction effect can be provided between the magnetic element and the magnetic attraction ring.

The easy-to-start thin motor of the present invention includes: a base, the base is provided with a shaft tube; a stator, the stator is combined with the base; a rotor, the rotor is rotatably connected to the shaft tube, and the rotor It has a magnetic element and a magnetic suction ring. The magnetic suction ring has a ring body and two positioning parts. The two positioning parts are radially oppositely connected to the ring body. The ring body is sleeved on the outer periphery of the shaft tube. The ring body is axially offset from the magnetic element, the two positioning portions are axially opposite to the magnetic element, and the stator has a sensing element, and the sensing element is axially offset from the two positioning portions. The rotor is rotatably assembled to the shaft tube by a rotating shaft, the magnetic element interface of the magnetic element and the rotating shaft have an interface connection, the sensing element deviates from the interface connection, and the two positioning portions deviate from the interface connection. . In this way, the polarity of the magnetic element can be detected by the sensing element.

Wherein, the two positioning portions are preferably disposed at an intermediate position between any two adjacent border lines. In this way, the two positioning portions can be respectively opposed to the ferromagnetic region of the magnetic pole.

The easy-to-start thin motor of the present invention includes: a base, the base is provided with a shaft tube; a stator, the stator is combined with the base; and a rotor, the rotor is rotatably connected to the base. A shaft tube, the rotor having a magnetic element, and a magnetic ring, the magnetic ring having a ring body and two positioning portions, the two positioning portions are radially oppositely connected to the ring body, and the ring body is sleeved on On the outer periphery of the shaft tube, the annular body is axially offset from the magnetic element, the two positioning portions are axially opposed to the magnetic element, respectively, and the stator has a sensing element, and the sensing element and the two positioning portions are The rotor is axially offset, and the rotor is rotatably assembled to the shaft tube. The magnetic pole junction of the magnetic element and the shaft have an interface connection. The sensing element deviates from the interface connection. On a radial plane, each magnetic pole of the magnetic element has a magnetic pole area, and the area of each positioning portion of the magnetic suction ring is 1/8 to 3/4 of the magnetic pole area. In this way, it can be ensured that the magnetic element and the magnetic suction ring can have a good magnetic suction effect without affecting the smoothness of the rotation of the rotor.

〔this invention〕

1‧‧‧ base

1a‧‧‧Inner surface

1b‧‧‧outer surface

11‧‧‧ shaft tube

12‧‧‧Anti-rotation Department

13‧‧‧ groove

2‧‧‧ stator

21‧‧‧Circuit Board

22‧‧‧ Silicon Steel Sheet Set

23‧‧‧coil set

24‧‧‧ sensing element

3‧‧‧ rotor

31‧‧‧ Wheel

32‧‧‧ shaft

33‧‧‧Magnetic element

4, 4’‧‧‧ magnetic ring

41, 41’‧‧‧ ring body

42, 42’‧‧‧ Positioning Department

5‧‧‧ stator

51‧‧‧Circuit Board

52‧‧‧coil set

53‧‧‧sensing element

6‧‧‧ base

6a‧‧‧Inner surface

6b‧‧‧outer surface

61‧‧‧through hole

62‧‧‧ shaft tube

63‧‧‧Groove

7‧‧‧ stator

71‧‧‧Circuit Board

72‧‧‧Insulation sleeve

73‧‧‧coil set

A1‧‧‧ Total area

A2‧‧‧ Magnetic pole area

A3‧‧‧ Area

D1‧‧‧Maximum outer diameter

D2‧‧‧Inner diameter

D3‧‧‧minimum inner diameter

D4‧‧‧ Outside diameter

L‧‧‧ Junction connection

θ‧‧‧ angle

〔Usually〕

9‧‧‧ Motor

91‧‧‧ base

911‧‧‧Inner surface

912‧‧‧outer surface

913‧‧‧Shaft tube

92‧‧‧rotor

921‧‧‧ Wheel

922‧‧‧Magnet ring

93‧‧‧ stator

931‧‧‧circuit board

932‧‧‧Induction coil

933‧‧‧ Positioning piece

Figure 1: Schematic diagram of a conventional motor that is easy to start.

FIG. 2 is a schematic three-dimensional exploded structure of the first embodiment of the present invention.

FIG. 3 is a schematic structural sectional view of a first embodiment of the present invention.

FIG. 4 is a schematic diagram of a configuration relationship between a magnetic ring and a magnetic element according to the first embodiment of the present invention.

FIG. 5 is a schematic diagram showing an area relationship between a magnetic pole and a positioning portion according to the first embodiment of the present invention.

FIG. 6 is a schematic diagram of a configuration relationship between a magnetic ring and a magnetic element according to another embodiment of the present invention.

FIG. 7 is a schematic diagram of a three-dimensional exploded structure of the second embodiment of the present invention.

FIG. 8 is a schematic structural sectional view of a second embodiment of the present invention.

FIG. 9 is a schematic structural sectional view of a third embodiment of the present invention.

Fig. 10 is a schematic structural sectional view of a fourth embodiment of the present invention.

In order to make the above and other objects, features, and advantages of the present invention more comprehensible, the following describes the preferred embodiments of the present invention and the accompanying drawings in detail, as follows: Please refer to FIG. First implementation of an easy-to-start thin motor of the present invention For example, the easy-to-start thin motor generally includes a base 1 and a stator 2, a rotor 3, and a magnetic ring 4 provided on the base 1.

Referring to FIGS. 2 and 3, the base 1 has an inner surface 1a and an outer surface 1b opposite to each other. The inner surface 1a of the base 1 is convexly provided with a shaft tube 11. In this embodiment, the shaft tube 11 The base 1 is integrally connected to the inner surface 1a. Therefore, the base 1 can be integrally injection-molded with a plastic material to improve the manufacturing convenience of the base 1. In addition, the base 1 may also be provided with an anti-rotation portion 12 to prevent the magnetic ring 4 from rotating on the base 1 to enhance the positioning effect of the magnetic ring 4; the anti-rotation portion 12 may be, for example, For the two bumps provided on the inner surface 1a, or other equivalent structures, the present invention is not limited thereto.

The stator 2 has a circuit board 21. The circuit board 21 may be, for example, a ring-shaped printed circuit board, so that the circuit board 21 can be assembled on the outer periphery of the shaft tube 11. The stator 2 of this embodiment may further include a silicon steel sheet group 22 and a coil group 23. The silicon steel sheet group 22 is sleeved on the outer periphery of the shaft tube 11, and the coil group 23 is wound around the shaft radially. The pole portion of the silicon steel sheet group 22 is electrically connected to the circuit board 21. In addition, the stator 2 may further include a sensing element 24 on the circuit board 21, and the sensing element 24 is used to detect the polarity of the magnetic pole. For example, the sensing element 24 may be a Hall effect sensor. Tester (Hall Sensor).

The rotor 3 includes a hub 31, a rotating shaft 32, and a magnetic element 33. The rotating shaft 32 is connected to the hub 31 and is rotatably provided on the shaft tube 11 of the base 1 by the rotating shaft 32. The magnetic element 33 is provided. On the inner surface of the hub 32 and facing the coil group 23 of the stator 2, the magnetic element 33 is radially opposed to the coil group 23. Among them, please refer to FIG. 4, the magnetic element 33 can form a plurality of N magnetic poles and a plurality of S magnetic poles by magnetizing means, and the plurality of N and S magnetic poles form a staggered arrangement on the magnetic element 33.

Please refer to FIGS. 3 and 4. The magnetic attraction ring 4 is made of a material having a magnetic permeability function. The magnetic attraction ring 4 has an annular body 41 and two positioning portions 42. The two positioning portions 42 are radially opposite to each other. Connected to the ring body 41, the ring body 41 can be sleeved on the shaft tube 11 of the base 1 On the outer periphery, the annular body 41 and the magnetic element 33 are axially displaced without facing each other, and the two positioning portions 42 are axially opposed to the magnetic element 33, respectively.

In more detail, for example, but without limitation, in this embodiment, the maximum outer diameter D1 of the annular body 41 may be selected to be smaller than the inner diameter D2 of the magnetic element 33 to ensure that the annular body 41 and the magnetic element 33 are axial. The two positioning portions 42 can extend outward from the outer peripheral edge of the annular body 41 so that the two positioning portions 42 can be axially opposed to the magnetic element 33 respectively. The annular body 41 may or may not contact the outer peripheral surface of the shaft tube 11, which is not limited in the present invention.

In addition, in this embodiment, the magnetic attraction ring 4 may be provided on the inner surface 1a of the base 1 so that the magnetic attraction ring 4 can be adjacent to the magnetic element 33 (preferably about 0.2 to 1 mm apart) to improve The magnetic attraction effect between the magnetic element 33 and the magnetic attraction ring 4. At the same time, at least one of the two positioning portions 42 can also be restricted by the anti-rotation portion 12, so that the magnetic attraction ring 4 can be quickly installed and positioned, and cannot be rotated on the base 1 after being installed and positioned.

In addition, after the magnetic attraction ring 4 is quickly installed and positioned, the sensing element 24 of the stator 2 can be axially offset from the two positioning portions 42. On the radial plane of the rotating shaft 32, the boundary between any two adjacent N and S magnetic poles of the magnetic element 33 and the rotating shaft 32 have a boundary line L, so that the boundary line L is located on any two adjacent N The magnetic field weakening area of the S magnetic pole (referred to generally as a weak magnetic area), and the sensing element 24 is disposed at a position deviating from the boundary line L. The two positioning portions 42 of the magnetic attraction ring 4 are also disposed at positions deviating from the boundary connecting line L, preferably at the intermediate positions between any two adjacent boundary connecting lines L, so that the two positioning portions 42 respectively face each other. It is located in the strong magnetic zone of the magnetic pole.

In addition, please refer to FIGS. 3 and 5, on the radial plane of the rotating shaft 32, the magnetic element 33 has a total area A1 closest to the magnetic attraction ring 4, and each magnetic pole has a magnetic pole area A2 (the magnetic element The number of magnetic poles of 33 is X, then A2 = A1 / X; for example, this embodiment reveals that the number of magnetic poles of the magnetic element 33 is 4, and each of the magnetic pole areas A2 is 1/4 of the total area A1), The area A3 of each of the positioning portions 42 of the magnetic attraction ring 4 is preferably 1/8 to 3/4 of the magnetic pole area A2 to ensure that the magnetic element 33 and the magnetic attraction ring 4 can have a good magnetic attraction. The effect will not affect the smoothness of the rotation of the rotor 3.

According to the foregoing structure, when the thin motor that is easy to start according to the present invention is used, the circuit board 21 can control the coil group 23 to generate an alternating magnetic field so as to interact with the N and S magnetic poles of the magnetic element 33, thereby driving the rotor 3 It rotates around this rotating shaft 32. When the rotor 3 is about to stop rotating, the magnetic element 33 and the two positioning portions 42 of the magnetic suction ring 4 can be magnetically attracted to each other to ensure that the rotor 3 can be stopped at a preferred starting position. Thereby, when the coil group 23 wants to drive the rotor 3 to rotate again, the sensing element 24 can quickly detect the polarity of the magnetic element 33, so that the thin motor of the present invention can be started more easily without starting dead angle, etc. problem.

It should be particularly noted that, since the magnetic ring 4 in the present invention can be sleeved on the outer periphery of the shaft tube 11 of the base 1 by its ring body 41, the magnetic ring 4 is provided on the inner surface of the base 1 1a, the outer surface 1b or between the inner surface 1a and the outer surface 1b, etc., the magnetic suction ring 4 will not cause structural interference with the shaft tube 11, which not only helps to improve the convenience of assembly, but also according to design requirements The position where the magnetic ring 4 is coupled to the base 1 can be freely changed, thereby improving the versatility and practicability of the magnetic ring 4.

It is worth mentioning that, referring to FIG. 6, in other embodiments, the magnetic ring 4 ′ may also have the minimum inner diameter D3 of the ring body 41 ′ larger than the outer diameter D4 of the magnetic element 33 to ensure the ring shape. The main body 41 ′ is axially offset from the magnetic element 33 and does not face each other; the two positioning portions 42 ′ of the magnetic attraction ring 4 ′ may extend inward from the inner peripheral edge of the annular body 41 ′, so that the two positioning portions 42 'Can be axially opposed to the magnetic elements 33, respectively. According to this, the magnetic ring 4 'can also achieve the above-mentioned effects.

Please refer to FIGS. 7 and 8, which are the second embodiment of the thin motor that is easy to start according to the present invention. The second embodiment of the present invention is substantially the same as the first embodiment described above. The main difference lies in the shape of the stator 5. And reveal the type of the magnetic attraction ring 4 provided on the outer surface 1b of the base 1.

In detail, the stator 5 of this embodiment has a circuit board 51 and is provided in the stator 5. A coil group 52 and a sensing element 53 of the circuit board 51. The circuit board 51 can be assembled on the outer periphery of the shaft tube 11 of the base 1, and the coil group 52 can be formed on the circuit board 51 by etching or electroforming to reduce the maximum axial height of the stator 5. After the assembly of the thin motor of this embodiment is completed, the magnetic element 33 of the rotor 3 may be axially opposed to the coil group 52 of the stator 5.

In addition, in this embodiment, the magnetic attraction ring 4 can be provided on the outer surface 1b of the base 1, so that if the magnetic attraction ring 4 accidentally falls off, it will not impact the rotor 3, and has the effects of avoiding damage to the rotor 3. . Preferably, a groove 13 can be further provided on the base 1 so that the magnetic ring 4 can be quickly aligned to be assembled into the groove 13 and help reduce the axial height of the overall thin motor. .

Please refer to FIG. 9, which is a third embodiment of the thin motor that is easy to start according to the present invention. The third embodiment of the present invention is substantially the same as the second embodiment described above. The main difference is that the third embodiment discloses The magnetic ring 4 is not exposed on the inner surface 1a and the outer surface 1b of the base 1. For example, the base 1 can be covered by the plastic injection molding method to make the magnetic The ring 4 can be more stably positioned at a predetermined position in the base 1, and the steps of assembling and fixing the magnetic ring 4 can also be omitted when assembling the thin motor to improve assembly convenience and efficiency.

Please refer to FIG. 10, which is a fourth embodiment of a thin motor that is easy to start according to the present invention. The thin motor of this embodiment generally includes a base 6, a stator 7 and a rotor 3 provided on the base 6. And a magnetic attraction ring 4; the structures of the rotor 3 and the magnetic attraction ring 4 are substantially the same as those of the previous embodiment, and will not be described in detail here.

The base 6 of this embodiment has an inner surface 6a and an outer surface 6b opposite to each other. The base 6 is provided with a through hole 61 that penetrates the inner surface 6a and the outer surface 6b. A shaft tube 62 is provided. The shaft tube 62 is made of a magnetically permeable metal material. The shaft tube 62 is combined in the through hole 61 by its circumferential surface.

The stator 7 has a circuit board 71. The circuit board 71 can be assembled on the outer periphery of the shaft tube 62. The stator 7 of this embodiment may further include an insulation sleeve 72 and a coil group 73. The insulation The sleeve 72 is sleeved on the outer periphery of the shaft tube 62, and the coil group 73 is wound and positioned on the insulation sleeve 72 in an axial winding form, and is electrically connected to the circuit board 71. In this way, the coil group 73 can be made of metal The shaft tube 62 is magnetically permeable.

Accordingly, since the magnetic ring 4 in the present invention can be sleeved on the outer periphery of the shaft tube 62 of the base 6 by its ring-shaped body 41, even if the bottom of the shaft tube 62 of this embodiment is exposed on the outer surface 6b of the base 6 , The magnetic ring 4 can still be arranged according to the design requirements on the inner surface 6a, the outer surface 6b, or between the inner surface 6a and the outer surface 6b of the base 6, and the magnetic ring 4 will not be connected to the shaft. The tube 62 generates structural interference, and the magnetic suction ring 4 does not contact the shaft tube 62 made of metal, so the magnetic leakage phenomenon does not occur.

To sum up, the thin motor of the present invention which is easy to start, the magnetic ring used for magnetic attraction with magnetic components has good versatility, no matter it is arranged on the outer surface, the inner surface, or the outer surface and the inner surface of the base. In other places, it will not cause structural interference with the shaft tube or cause magnetic leakage, so it can be applied to different types of thin motors with good practicability.

In the thin motor of the invention, which is easy to start, the magnetic attraction ring can be quickly installed near the magnetic element to improve the magnetic attraction effect between the magnetic element and the magnetic attraction ring.

Although the present invention has been disclosed using the above-mentioned preferred embodiments, it is not intended to limit the present invention. Anyone skilled in the art can make various changes and modifications to the above embodiments without departing from the spirit and scope of the present invention. The technical scope protected by the invention, so the scope of protection of the present invention shall be determined by the scope of the appended patent application.

Claims (9)

An easy-to-start thin motor includes: a base, the base is provided with a shaft tube; a stator, the stator is coupled to the base; a rotor, the rotor is rotatably connected to the shaft tube, and the rotor has A magnetic element; and a magnetic suction ring, the magnetic suction ring has a ring body and two positioning portions, the two positioning portions are radially oppositely connected to the ring body, and the ring body is sleeved on the outer periphery of the shaft tube, The ring body is axially offset from the magnetic element, the two positioning portions are axially opposed to the magnetic element, respectively, the base has an opposite inner surface and an outer surface, and the magnetic attraction ring is not exposed on the inner surface And the outer surface. The easy-to-start thin motor according to item 1 of the scope of patent application, wherein the base covers the magnetic ring with a plastic injection molding method. An easy-to-start thin motor includes: a base, the base is provided with a shaft tube; a stator, the stator is coupled to the base; a rotor, the rotor is rotatably connected to the shaft tube, and the rotor has A magnetic element; and a magnetic suction ring, the magnetic suction ring has a ring body and two positioning portions, the two positioning portions are radially oppositely connected to the ring body, and the ring body is sleeved on the outer periphery of the shaft tube, The ring body is axially offset from the magnetic element, the two positioning portions are axially opposite to the magnetic element, and the base is provided with an anti-rotation portion, and at least one of the two positioning portions is restricted by the anti-rotation portion. Bit. According to the thin motor that is easy to start as described in item 1 of the patent application scope, wherein the maximum outer diameter of the ring body is smaller than the inner diameter of the magnetic element, the two positioning portions extend outward from the outer peripheral edge of the ring body. An easy-to-start thin motor includes: a base, the base is provided with a shaft tube; a stator, the stator is coupled to the base; a rotor, the rotor is rotatably connected to the shaft tube, and the rotor has A magnetic element; and a magnetic suction ring, the magnetic suction ring has a ring body and two positioning portions, the two positioning portions are radially oppositely connected to the ring body, and the ring body is sleeved on the outer periphery of the shaft tube, The ring body is axially offset from the magnetic element, and the two positioning portions are axially opposite to the magnetic element, respectively. The minimum inner diameter of the ring body is larger than the outer diameter of the magnetic element. The two positioning portions are formed by the ring body. The inner periphery extends inward. As described in item 1 of the patent application, the thin motor is easy to start, wherein the magnetic ring is 0.2 to 1 mm away from the magnetic element. An easy-to-start thin motor includes: a base, the base is provided with a shaft tube; a stator, the stator is coupled to the base; a rotor, the rotor is rotatably connected to the shaft tube, and the rotor has A magnetic element; and a magnetic suction ring, the magnetic suction ring has a ring body and two positioning portions, the two positioning portions are radially oppositely connected to the ring body, and the ring body is sleeved on the outer periphery of the shaft tube, The ring body is axially offset from the magnetic element, the two positioning portions are axially opposite to the magnetic element, and the stator has a sensing element, and the sensing element is axially offset from the two positioning portions. The rotor is rotatably assembled to the shaft tube by a rotating shaft. The magnetic pole interface between the magnetic element and the rotating shaft has an interface line, the sensing element is offset from the interface line, and the two positioning portions are offset from the interface line. As described in item 10 of the scope of the patent application, the thin motor is easy to start, wherein the two positioning portions are disposed at an intermediate position between any two adjacent border lines. An easy-to-start thin motor includes: a base, the base is provided with a shaft tube; a stator, the stator is coupled to the base; a rotor, the rotor is rotatably connected to the shaft tube, and the rotor has A magnetic element; and a magnetic suction ring, the magnetic suction ring has a ring body and two positioning portions, the two positioning portions are radially oppositely connected to the ring body, and the ring body is sleeved on the outer periphery of the shaft tube, The ring body is axially offset from the magnetic element, the two positioning portions are axially opposite to the magnetic element, and the stator has a sensing element, and the sensing element is axially offset from the two positioning portions. The rotor is rotatably assembled to the shaft tube by a rotating shaft. The magnetic element junction of the magnetic element has an interface connection with the shaft. The sensing element deviates from the interface line. On the radial plane of the shaft, the Each magnetic pole of the magnetic element has a magnetic pole area, and the area of each positioning portion of the magnetic suction ring is 1/8 to 3/4 of the magnetic pole area.